Journal ArticleThe Science of the total environment · October 2024
Bioaerosols control techniques, especially ultraviolet germicidal irradiation (UVGI) are gaining attention due to increasing needs for controlling of health risk caused by airborne biocontaminants. The effectiveness of a full-scale in-duct UVGI air disinfe ...
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Journal ArticleAnn Biomed Eng · March 2024
We demonstrate a methodology which both improves oxygen transport and reduces or eliminates bubble formation in a novel hyperbaric membrane oxygenator catheter model system. Angular oscillations were introduced to a bundle of hollow fiber membranes (HFMs) ...
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Journal ArticleJournal of Environmental Chemical Engineering · October 1, 2023
Biological processes are increasingly applied for gas purification as a sustainable and economical alternative to conventional physical-chemical processes (chemical absorption, incineration, adsorption). Although biological gas treatment is accepted as an ...
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Journal ArticleJournal of hazardous materials · October 2023
Granular activated carbon (GAC) and anion exchange resin (AIX) have been successfully demonstrated to remove per- and polyfluoroalkyl substances (PFAS) from contaminated water and wastewater. These treatment technologies, when applied for PFAS removal, gen ...
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Journal ArticleEnvironmental technology · April 2023
An increasing body of literature suggests that aerosol inhalation plays a primary role in COVID-19 transmission, particularly in indoor settings. Mechanistic stochastic models can help public health professionals, engineers, and space planners understand t ...
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Journal ArticleChemical Engineering Journal · March 15, 2023
Capillary microreactors have shown superior performance as a result of the precise control of reaction parameters, contact time, shape and size of the interface between gas and liquid and enhanced mass transfer due to high surface to volume ratio. In this ...
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ConferenceWEFTEC 2023 - 96th Annual Water Environment Federation Technical Exhibition and Conference · January 1, 2023
Rising concern of Perfluorinated alkylated substances (PFAS) contamination of our ecosystem has sparked interest in this class of pollutants as it pertains to water and waste management. While PFAS sources are numerous, it is widely believed that firefight ...
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ConferenceProceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA · January 1, 2023
Rising concern of Perfluorinated alkylated substances (PFAS) contamination of our ecosystem has sparked interest in this class of pollutants as it pertains to water and waste management. While PFAS sources are numerous, it is widely believed that firefight ...
Cite
Journal ArticleBiochemical Engineering Journal · November 1, 2022
Accurate measurements of mass transfer coefficients are critical for reliable characterization of bioreactors. While standardized methods to measure mass transfer coefficients have been established for simple stirred tank reactors, existing methods to char ...
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Journal ArticleThe Science of the total environment · June 2022
The aeromicrobiological transmission pathway of enteric pathogens in places with unsafe sanitation services is poorly understood. In an attempt to partly fill this knowledge gap, we assessed the potential public health impact of bioaerosols near open waste ...
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Journal ArticleRespir Care · April 2022
Acute respiratory failure with inadequate oxygenation and/or ventilation is a common reason for ICU admission in children and adults. Despite the morbidity and mortality associated with acute respiratory failure, few proven treatment options exist beyond i ...
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Journal ArticleEnvironmental science & technology · November 2021
Urban sanitation infrastructure is inadequate in many low-income countries, leading to the presence of highly concentrated, uncontained fecal waste streams in densely populated areas. Combined with mechanisms of aerosolization, airborne transport of enteri ...
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Journal ArticleThe Science of the total environment · October 2021
On-site sewage treatment systems can be an important source of antibiotic resistant bacteria and organic micropollutants into adjacent groundwater. Due to the frequent proximity of private wells to septic systems, this contamination is a concern to communi ...
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Journal ArticleChemical Engineering Journal · March 1, 2021
This paper details the development, validation, and analysis of a conceptually correct mathematical model for biogas upgrading biological trickling filter (BTF) reactors. The model considers convective transport and dispersion of gases through the fixed be ...
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Journal ArticleEnvironmental research · March 2021
Antibiotic resistance poses a major global health threat. Understanding emergence and dissemination of antibiotic resistance in environmental media is critical to the design of control strategies. Because antibiotic resistance genes (ARGs) may be aerosoliz ...
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Journal ArticleThe American journal of tropical medicine and hygiene · March 2021
Understanding the movement of antimicrobial resistance genes (ARGs) in the environment is critical to managing their spread. To assess potential ARG transport through the air via urban bioaerosols in cities with poor sanitation, we quantified ARGs and a mo ...
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Journal ArticleBiotechnol Bioeng · January 2021
Despite hypoxic respiratory failure representing a large portion of total hospitalizations and healthcare spending worldwide, therapeutic options beyond mechanical ventilation are limited. We demonstrate the technical feasibility of providing oxygen to a b ...
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Journal ArticleJournal of environmental management · January 2021
A mobile septage treatment unit was built in India using readily available filters and membranes (mesh fabric, sand, granular activated carbon (GAC), microfilter, ultrafilter) and installed on the bed of a small truck. The target application was emptying o ...
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Journal ArticleThe Science of the total environment · October 2024
Bioaerosols control techniques, especially ultraviolet germicidal irradiation (UVGI) are gaining attention due to increasing needs for controlling of health risk caused by airborne biocontaminants. The effectiveness of a full-scale in-duct UVGI air disinfe ...
Full textCite
Journal ArticleAnn Biomed Eng · March 2024
We demonstrate a methodology which both improves oxygen transport and reduces or eliminates bubble formation in a novel hyperbaric membrane oxygenator catheter model system. Angular oscillations were introduced to a bundle of hollow fiber membranes (HFMs) ...
Full textLink to itemCite
Journal ArticleJournal of Environmental Chemical Engineering · October 1, 2023
Biological processes are increasingly applied for gas purification as a sustainable and economical alternative to conventional physical-chemical processes (chemical absorption, incineration, adsorption). Although biological gas treatment is accepted as an ...
Full textCite
Journal ArticleJournal of hazardous materials · October 2023
Granular activated carbon (GAC) and anion exchange resin (AIX) have been successfully demonstrated to remove per- and polyfluoroalkyl substances (PFAS) from contaminated water and wastewater. These treatment technologies, when applied for PFAS removal, gen ...
Full textCite
Journal ArticleEnvironmental technology · April 2023
An increasing body of literature suggests that aerosol inhalation plays a primary role in COVID-19 transmission, particularly in indoor settings. Mechanistic stochastic models can help public health professionals, engineers, and space planners understand t ...
Full textCite
Journal ArticleChemical Engineering Journal · March 15, 2023
Capillary microreactors have shown superior performance as a result of the precise control of reaction parameters, contact time, shape and size of the interface between gas and liquid and enhanced mass transfer due to high surface to volume ratio. In this ...
Full textCite
ConferenceWEFTEC 2023 - 96th Annual Water Environment Federation Technical Exhibition and Conference · January 1, 2023
Rising concern of Perfluorinated alkylated substances (PFAS) contamination of our ecosystem has sparked interest in this class of pollutants as it pertains to water and waste management. While PFAS sources are numerous, it is widely believed that firefight ...
Cite
ConferenceProceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA · January 1, 2023
Rising concern of Perfluorinated alkylated substances (PFAS) contamination of our ecosystem has sparked interest in this class of pollutants as it pertains to water and waste management. While PFAS sources are numerous, it is widely believed that firefight ...
Cite
Journal ArticleBiochemical Engineering Journal · November 1, 2022
Accurate measurements of mass transfer coefficients are critical for reliable characterization of bioreactors. While standardized methods to measure mass transfer coefficients have been established for simple stirred tank reactors, existing methods to char ...
Full textCite
Journal ArticleThe Science of the total environment · June 2022
The aeromicrobiological transmission pathway of enteric pathogens in places with unsafe sanitation services is poorly understood. In an attempt to partly fill this knowledge gap, we assessed the potential public health impact of bioaerosols near open waste ...
Full textCite
Journal ArticleRespir Care · April 2022
Acute respiratory failure with inadequate oxygenation and/or ventilation is a common reason for ICU admission in children and adults. Despite the morbidity and mortality associated with acute respiratory failure, few proven treatment options exist beyond i ...
Full textLink to itemCite
Journal ArticleEnvironmental science & technology · November 2021
Urban sanitation infrastructure is inadequate in many low-income countries, leading to the presence of highly concentrated, uncontained fecal waste streams in densely populated areas. Combined with mechanisms of aerosolization, airborne transport of enteri ...
Full textCite
Journal ArticleThe Science of the total environment · October 2021
On-site sewage treatment systems can be an important source of antibiotic resistant bacteria and organic micropollutants into adjacent groundwater. Due to the frequent proximity of private wells to septic systems, this contamination is a concern to communi ...
Full textCite
Journal ArticleChemical Engineering Journal · March 1, 2021
This paper details the development, validation, and analysis of a conceptually correct mathematical model for biogas upgrading biological trickling filter (BTF) reactors. The model considers convective transport and dispersion of gases through the fixed be ...
Full textCite
Journal ArticleEnvironmental research · March 2021
Antibiotic resistance poses a major global health threat. Understanding emergence and dissemination of antibiotic resistance in environmental media is critical to the design of control strategies. Because antibiotic resistance genes (ARGs) may be aerosoliz ...
Full textCite
Journal ArticleThe American journal of tropical medicine and hygiene · March 2021
Understanding the movement of antimicrobial resistance genes (ARGs) in the environment is critical to managing their spread. To assess potential ARG transport through the air via urban bioaerosols in cities with poor sanitation, we quantified ARGs and a mo ...
Full textCite
Journal ArticleBiotechnol Bioeng · January 2021
Despite hypoxic respiratory failure representing a large portion of total hospitalizations and healthcare spending worldwide, therapeutic options beyond mechanical ventilation are limited. We demonstrate the technical feasibility of providing oxygen to a b ...
Full textLink to itemCite
Journal ArticleJournal of environmental management · January 2021
A mobile septage treatment unit was built in India using readily available filters and membranes (mesh fabric, sand, granular activated carbon (GAC), microfilter, ultrafilter) and installed on the bed of a small truck. The target application was emptying o ...
Full textCite
ConferenceProgress in Biomedical Optics and Imaging - Proceedings of SPIE · January 1, 2021
Limited options exist to improve oxygenation in patients with acute hypoxic respiratory failure. We are developing an intravascular oxygenator catheter capable of delivering a clinically significant amount of oxygen directly into the bloodstream of patient ...
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Journal ArticleJ Infect Dis · November 9, 2020
During April and May 2020, we studied 20 patients hospitalized with coronavirus disease 2019 (COVID-19), their hospital rooms (fomites and aerosols), and their close contacts for molecular and culture evidence of severe acute respiratory syndrome coronavir ...
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Journal ArticleChemosphere · November 2020
Micro-capillary bioreactors (1 mm ID, 10 cm long) were investigated for the biodegradation of toluene vapors as a model volatile organic compound (VOC). The intended application is the removal of VOCs from indoor air, when such microbioreactor is coupled w ...
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Journal ArticleThe Science of the total environment · October 2020
Evidence of exposure to enteric pathogens through the air and associated risk of infection is scarce in the literature outside of animal- or human-waste handling settings. Cities with poor sanitation are important locations to investigate this aerial expos ...
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Journal ArticleThe Science of the total environment · October 2020
Evidence of exposure to enteric pathogens through the air and associated risk of infection is scarce in the literature outside of animal- or human-waste handling settings. Cities with poor sanitation are important locations to investigate this aerial expos ...
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Journal ArticleChemosphere · October 2020
This study investigated the feasibility of co-treating H2S and CO2 in a biological trickling filter (BTF) inoculated with hydrogenotrophic methanogens (HMs) and nitrate-reducing, sulfur-oxidizing bacteria. This was accomplished by int ...
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Journal ArticleChemosphere · October 2020
There is a great need for simple methods for digestate management for potential household sanitation systems based on anaerobic digestion of minimally diluted fecal waste in countries that lack safe sanitation. Herein, a full-scale three-stage filter for n ...
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Journal ArticleThe Science of the total environment · October 2020
Evidence of exposure to enteric pathogens through the air and associated risk of infection is scarce in the literature outside of animal- or human-waste handling settings. Cities with poor sanitation are important locations to investigate this aerial expos ...
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Journal ArticleEnvironmental science & technology · October 2020
An integrated biotrickling filter-anammox bioreactor system for the complete treatment of ammonia in air with conversion to nitrogen gas without the supply of an extraneous electron donor for denitrification was established. Partial nitritation (i.e., conv ...
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Journal ArticleSensors (Basel, Switzerland) · May 2020
Technology innovation in sanitation is needed for the 4.2 billion people worldwide, lacking safely managed sanitation services. A major requirement for the adoption of these technologies is the management of malodor around toilet and treatment systems. The ...
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Journal ArticleThe Science of the total environment · April 2020
Simple trickling nitrification filters and submerged denitrification filters were developed to provide post-treatment to high-strength human waste anaerobic digestate with the aims to (i) effectively recover nutrients in a useful form as a fertilizer and t ...
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Journal ArticleBioresource technology · October 2019
This study investigated the hydrogen mass transfer limitations in a biotrickling filter inoculated with hydrogenotrophic methanogens for biogas upgrading. A highly sensitive dissolved hydrogen probe allowed measuring concentrations in real-time. Experiment ...
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ConferenceBioCAS 2019 - Biomedical Circuits and Systems Conference, Proceedings · October 1, 2019
There is an unmet need for a low-cost instrumented technology for detecting malodor around toilets and emerging sanitation technologies for onsite waste treatment. Our approach to an electronic nose for sanitation-related malodor is based on the use of ele ...
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Journal ArticleEnvironmental science & technology · February 2019
Typical biofilters and biotrickling filters used for volatile organic compounds (VOCs) control have treatment rates limited to 30-200 g m-3 h-1, mostly because they are exposed to dilute VOC streams, have moderate biomass density and ...
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Journal ArticleThe Science of the total environment · January 2019
Pit latrines are the most common sanitation option in the developing world. They are simple to build but require periodic emptying which results in widespread dispersion of fecal pathogens in the environment. While much is known about the health risks of f ...
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Journal ArticleJournal of applied electrochemistry · January 2019
AbstractWe report the development of novel modes of operation for electrochemical disinfection of E. coli in human urine simulant with an aim to minimize the energy required for disinfection. The system employs boron-doped diamond electrode ...
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Journal ArticleWater research · September 2018
Electrochemical disinfection (ECD) has become an important blackwater disinfection technology. ECD is a promising solution for the 2 billion people without access to conventional sanitation practices and in areas deficient in basic utilities (e.g., sewers, ...
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Journal ArticleChemosphere · August 2018
The treatment of high-strength anaerobic digester effluent in laboratory-scale trickling filters for nitrification and then anaerobic filters for denitrification is reported. Five media types were investigated in the trickling filters: biochar, granular ac ...
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Journal ArticleEnvironmental science & technology · August 2018
Mercury-contaminated sediment and water contain various Hg species, with a small fraction available for microbial conversion to the bioaccumulative neurotoxin monomethylmercury (MeHg). Quantification of this available Hg pool is needed to prioritize sites ...
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Journal ArticleElife · June 19, 2018
How host and microbial factors combine to structure gut microbial communities remains incompletely understood. Redox potential is an important environmental feature affected by both host and microbial actions. We assessed how antibiotics, which can impact ...
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Journal ArticleChemosphere · November 2017
A novel biotrickling filter using a 3D-printed honeycomb-monolith as its filter bed has been proposed and studied in this work and a solution to bed-clogging problems using pigging was demonstrated. The inlet H2S concentration in the mimic bioga ...
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Journal ArticleApplied biochemistry and biotechnology · October 2017
This research reports the development of a biotrickling filter (BTF) to upgrade biogas, which is achieved by adding H2 to reduce CO2. H2 and CO2 (80:20% vol.) were fed to a bench-scale BTF packed with polyurethan ...
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Journal ArticleACS applied materials & interfaces · May 2017
This work investigates the surface chemistry of H2O2 generation on a boron-doped ultrananocrystalline diamond (BD-UNCD) electrode. It is motivated by the need to efficiently disinfect liquid waste in resource constrained environments ...
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Journal ArticleJournal of Electroanalytical Chemistry · March 1, 2017
This work describes a simple wet chemical synthesis of iron oxide (Fe3O4) nanoparticles (NPs) capped with terephthalic acid (TA) and their application for the individual detection of Hg(II), Pb(II) and Cd(II) ions as well as simultaneous and selective dete ...
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Journal ArticleChemical Engineering Journal · February 15, 2017
Many emerging bioprocesses include a second, non-aqueous phase liquid in which the key substrate or product partitions for either enhanced interphase mass transfer, concentration dampening, or in-situ product extraction. Knowledge of the partition coeffici ...
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Book · January 1, 2017
The number-one environmental threat to public health, air pollution remains a pressing problem-made even more complicated by the massive quantity and diversity of air pollution sources. Biofiltration technology (using micro-organisms growing on porous medi ...
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Journal ArticleEnvironmental technology · December 2016
The present study reports CO2 capture and conversion to bicarbonate using Escherichia coli expressing carbonic anhydrase (CA) on its cell surface in a novel foam bioreactor. The very large gas-liquid interfacial area in the foam bioreactor promoted rapid C ...
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Journal ArticleEnvironmental Engineering Science · November 1, 2016
The Anaerobic Digestion Pasteurization Latrine (ADPL) is a self-contained and energy neutral on-site sanitation system using anaerobic digestion of fecal sludge to generate biogas and then uses the biogas to pasteurize the digester effluent at 65-75°C to p ...
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Journal ArticleBioresource technology · September 2016
Intensive monitoring was carried out to evaluate the performance of a full-scale innovative swine waste-to-energy system at a commercial swine farm with 8640 heads of swine. Detailed mass balances over each unit of the system showed that the system, which ...
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Journal ArticleChemical Engineering Journal · June 15, 2016
Non-thermal plasma (NTP) is an emerging technology for the treatment of volatile organic compounds (VOCs) in polluted point source air streams. Here, a dielectric barrier discharge NTP was used to evaluate the treatment efficiency of several common VOCs at ...
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Journal ArticleEnvironmental science & technology · March 2016
Unconventional shale gas development holds promise for reducing the predominant consumption of coal and increasing the utilization of natural gas in China. While China possesses some of the most abundant technically recoverable shale gas resources in the w ...
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Journal ArticleTransactions of the ASABE · January 1, 2016
The greater reliance on concentrated animal feeding operations (CAFOs) for livestock production presents both environmental challenges and opportunities for renewable energy and resource recovery. In this article, the design, economics of construction and ...
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ConferenceWEFTEC 2016 - 89th Water Environment Federation Annual Technical Exhibition and Conference · January 1, 2016
The Anaerobic Digestion Pasteurization Latrine (ADPL) is a self-contained and energy neutral on-site sanitation system using anaerobic digestion of fecal sludge to generate biogas, and then uses the biogas to pasteurize the digester effluent at 65-75 °C to ...
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Journal ArticleChemosphere · December 2015
A continuous supercritical water oxidation reactor was designed and constructed to investigate the conversion of a feces simulant without the use of a co-fuel. The maximum reactor temperature and waste conversion was determined as a function of stoichiomet ...
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Journal ArticleEnergy for Sustainable Development · December 1, 2015
Improving access to sanitation is one of the most effective means to improve public health. Anaerobic digestion of high-strength undiluted human simulant excreta was investigated in laboratory systems. The focus was on demonstrating the suitability of usin ...
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Journal ArticleInternational Journal of Hydrogen Energy · October 15, 2015
Proton exchange membranes (PEM) are critical components of low temperature fuel cells. Most PEMs are made of perfluorinated sulfonic acid polymers such as Nafion®. However, Nafion has a high methanol permeability which is limiting its applicability in dire ...
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Journal ArticleEnvironmental science. Processes & impacts · September 2015
Monomethylmercury (MeHg) is produced in many aquatic environments by anaerobic microorganisms that take up and methylate inorganic forms of Hg(II). Net methylation of Hg(II) appears to be correlated with factors that affect the activity of the anaerobic mi ...
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Journal ArticleBiotechnology and bioengineering · August 2015
Invasive Lactobacillus bacteria inhibit ethanol fermentations and reduce final product yields. Due to the emergence of antibiotic resistant strains of Lactobacillus spp., alternative disinfection strategies are needed for ethanol fermentations. The feasibi ...
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Journal ArticleEnvironmental science & technology · July 2015
Volumes of natural gas extraction-derived wastewaters have increased sharply over the past decade, but the ultimate fate of those waste streams is poorly characterized. Here, we sought to (a) quantify natural gas residual fluid sources and endpoints to bou ...
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Journal ArticleEnvironmental engineering science · July 2015
Bioaccumulation of methylmercury in the aquatic food web is governed in part by the methylation of inorganic divalent mercury (Hg(II)) by anaerobic microorganisms. In sulfidic settings, a small fraction of total Hg(II) is typically bioavailable to methylat ...
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Journal ArticleInternational Journal of Hydrogen Energy · June 15, 2015
Duckweed harvested from a swine wastewater treatment system was evaluated for its potential as a fermentation feedstock for the production of biohydrogen. The effects of pretreatment and fermentation conditions on biohydrogen production were investigated i ...
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Journal ArticleBiotechnology and bioengineering · February 2015
Although biofilm-based biotechnologies exhibit a large potential as solutions for off-gas treatment, the high water content of biofilms often causes pollutant mass transfer limitations, which ultimately limit their widespread application. The present study ...
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Journal ArticleChemosphere · December 2014
Anaerobic digester effluent collected from a swine farm was nitrified in lab-scale bioreactors mimicking an innovative manure management system to understand factors relevant to a successful start-up. The effects of digester effluent strength, aeration tim ...
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Journal ArticleEnvironmental science & technology · August 2014
The production of methylmercury (MeHg) by anaerobic microorganisms depends in part on the speciation and bioavailability of inorganic mercury to these organisms. Our previous work with pure cultures of methylating bacteria has demonstrated that the methyla ...
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Journal ArticleEnvironmental technology · May 2014
The purpose of this study was to develop a mathematical model that can describe glucose degradation in a microbial fuel cell (MFC) with the use of finite difference approach. The dynamic model can describe both substrate and pH changes in the anode chamber ...
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Journal ArticleJournal of hazardous materials · January 2014
Mercury emissions from coal combustion have become a global concern as growing energy demands have increased the consumption of coal. The effective implementation of treatment technologies requires knowledge of mercury speciation in the flue gas, namely co ...
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Journal ArticleJournal of the Electrochemical Society · January 1, 2014
We report the development of an electrochemical disinfection system for human urine, which does not require the addition of any external water or chemical reagents. It is designed to minimize energy consumption so that it may be powered from point-of-use s ...
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Journal ArticleChemical Engineering Journal · October 1, 2013
Perchlorate (ClO4-) is a contaminant of concern in groundwater and drinking water. In the presence of a suitable electron donor, perchlorate can be reduced to non-toxic chloride via either biotic or abiotic mechanisms. The objective of this study was to ev ...
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Journal ArticleEnviron Sci Technol · March 19, 2013
Mercury is a potent neurotoxin for humans, particularly if the metal is in the form of methylmercury. Mercury is widely distributed in aquatic ecosystems as a result of anthropogenic activities and natural earth processes. A first step toward bioaccumulati ...
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Journal Article · March 13, 2013
A case study of a full-scale biotrickling filter for the removal of high loads of hydrogen sulphide contained in biogas is analyzed. Startup, performance and operational and design challenges are analyzed. Also, fundamental aspects in biogas desulfurizatio ...
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Journal ArticleElectrochimica Acta · March 1, 2013
A facile electrochemical functionalization method was utilized to decorate single-walled carbon nanotubes (SWNTs) with tin oxide and their gas sensing performance toward various analytes (NH3, NO2, H 2, H2S, acetone, and water vapor) was evaluated at room ...
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Journal ArticleECS Transactions · January 1, 2013
We report the development of an electrochemical disinfection system for human urine, which does not require the addition of any external water or chemical reagents. It is designed to minimize energy consumption so that it may derive its energy from solar p ...
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Journal ArticleBioresource technology · May 2012
This study examines the use of a moving bed biofilm reactor (MBBR) as a tertiary treatment step for ammonia removal in high temperature (35-45°C) effluents, and quantifies different phenotypes of ammonia and nitrite oxidizing bacteria responsible for nitri ...
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Journal ArticleEnvironmental technology · April 2012
The present work describes the biofiltration of mixture of n-propanol (as a model hydrophilic volatile organic compound (VOC)) and toluene (as a model hydrophobic VOC) in a biofilter packed with a compost-woodchip mixture. Initially, the biofilter was fed ...
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Journal ArticleChemical Engineering Journal · February 15, 2012
During biological reduction of trichloroethene (TCE), incomplete reduction to partially dechlorinated intermediates cis-1,2-dichloroethene (cis-DCE) and vinyl chloride (VC) can occur due to kinetic and inhibitory limitations. In this study, an anaerobic bi ...
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Journal ArticleAnalog Integrated Circuits and Signal Processing · January 1, 2012
Environmental monitoring relies on compact, portable sensor systems capable of detecting pollutants in real-time. An integrated chemical sensor array system is developed for detection and identification of environmental pollutants in diesel and gasoline ex ...
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Journal ArticleEnvironmental technology · December 2011
The adsorption of two acidic pharmaceutically active compounds (PhACs), clofibric acid and ketoprofen, onto powdered activated carbon (PAC) was investigated with a particular focus on the influence of natural organic matter (NOM) on the adsorption of the P ...
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Journal ArticleElectroanalysis · November 1, 2011
Metal nanoparticles decorated single-walled carbon nanotubes (SWNTs) can lead to considerable enhancement in sensing performance towards different gas analytes, however the sensing mechanism was not clearly elucidated. The detailed sensing mechanism of hyb ...
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Journal ArticleWater research · November 2011
Biological removal of reduced sulfur compounds in energy-rich gases is an increasingly adopted alternative to conventional physicochemical processes, because of economical and environmental benefits. A lab-scale biotrickling filter reactor for the treatmen ...
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Journal ArticleThe journal of physical chemistry. C, Nanomaterials and interfaces · July 2011
Low-cost, low power consumption gas sensors that can detect or quantify various gas analytes are of increasing interest for various applications ranging from mobile health, to environmental exposure assessment and homeland security. In particular miniature ...
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Journal ArticleEnvironmental technology · April 2011
Membrane bioreactors are gaining interest for the control of contaminated air streams. In this study, the removal of toluene and n-hexane vapours in a hollow fibre membrane bioreactor (HFMB) was investigated. The focus was on quantifying the possible inter ...
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Journal ArticleEnvironmental science & technology · February 2011
Anaerobic bioreactors containing Dehalococcoides spp. can be effective for the treatment of trichloroethene (TCE) contamination. However, reductive dehalogenation of TCE often results in partial conversion to harmless ethene, and significant production of ...
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Journal ArticleWater research · December 2010
Thermophilic anaerobic sludge digestion is a promising process to divert waste to beneficial use, but an important question is the required temperature and holding time to achieve a given degree of pathogen inactivation. In this study, the kinetics of inac ...
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Journal ArticleNanotechnology · July 2010
Sn doped CuO nanotubes were synthesized by thermal oxidization of Cu/SnO(2) core-shell nanowires in air through the Kirkendall effect. The Cu/SnO(2) core-shell nanowires were sequentially electrodeposited by forming a SnO(2) shell followed by electrodeposi ...
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Journal ArticleProcess Biochemistry · April 1, 2010
A detailed analysis of a biotrickling filter treating trichloroethene (TCE) vapors anaerobically is presented and discussed. The biotrickling filter relies on mixed cultures containing bacteria from the genus Dehalococcoides that reductively dechlorinate T ...
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Journal ArticleNanotechnology · February 2010
Electrical and gas sensing properties of single-walled carbon nanotube networks functionalized with polyaniline (PANI-SWNTs) were systematically investigated to understand the gas sensing mechanisms and optimize sensing performance. The temperature-depende ...
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Journal ArticleAnalytical chemistry · January 2010
Herein, we demonstrate that highly sensitive conductometric gas nanosensors for H(2)S can be synthesized by electrodepositing gold nanoparticles on single-walled carbon nanotube (SWNT) networks. Adjusting the electrodeposition conditions allowed for tuning ...
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Journal ArticleElectroanalysis · January 1, 2010
The electrical transport and NH3 sensing properties of randomly oriented and aligned SWNT networks were presented and discussed. The results indicate that aligned SWNT-FETs have better FET characteristics due to the reduced number of interconnected nodes. ...
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Journal ArticleProceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA · December 1, 2009
There are an estimated 852 sites with groundwater and/or soil contaminated with trichloroethylene (TCE) in the US. To biologically treat TCE-laden waste gas streams, a different microbial metabolic pathway is needed. A study was conducted to provide proof ...
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Journal ArticleIn Situ and On-Site Bioremediation-2009: Proceedings of the 10th International In Situ and On-Site Bioremediation Symposium · December 1, 2009
Aerobic biotreatment of trichloroethylene(TCE)-laden soil vapor extraction gases has not found practical application because of its recalcitrance. This study looks at removing TCE from contaminated sites by anaerobic gas-phase biotreatment. An anaerobic bi ...
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Journal ArticleIn Situ and On-Site Bioremediation-2009: Proceedings of the 10th International In Situ and On-Site Bioremediation Symposium · November 27, 2009
Aerobic biotreatment of trichloroethylene(TCE)-laden soil vapor extraction gases has not found practical application because of its recalcitrance. This study looks at removing TCE from contaminated sites by anaerobic gas-phase biotreatment. An anaerobic bi ...
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Journal ArticleEnvironmental science & technology · October 2009
Until now, it has not been possible to use biofiltration to treat trichloroethene (TCE) from waste gases generated by soil vapor extraction or dual-phase extraction at remediation sites because aerobic biodegradation of TCE is possible only via cometabolis ...
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Journal ArticleBiotechnology and bioengineering · August 2009
Many bioprocesses depend on the effective formation of a biofilm on a solid support. In the present study, three different surface treatments (sandblasting, pure-O(2) plasma, and He-O(2) plasma treatments) were conducted on polypropylene (PP) Pall rings us ...
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Journal ArticleNanotechnology · June 2009
The fabrication of a gas nanosensor for detecting ammonia gas in air that is unaffected by humidity is demonstrated. On functionalizing single-walled carbon nanotube (SWNT) networks with a precise amount of camphorsulfonic-acid-doped polyaniline (PANI(CSA) ...
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Journal ArticleEnvironmental technology · May 2009
Moisture control is one the most important parameters in biofilters for air pollution control. Biofilters tend to experience drying at the air inlet port, which causes decreased pollutant removal over time. In this study, the installation of an irrigation ...
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Journal ArticleNanotechnology · May 2009
SnO(2) nanotubes with controlled diameter and length were synthesized using an electrochemical method at room temperature. The length and wall thickness of the nanotubes increased monotonically with the deposition time and the diameter of the nanotubes was ...
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Journal ArticleApplied Physics Letters · March 6, 2009
We report a sensitive, selective, and fast responding room temperature chemiresistive sensor for hydrogen sulfide detection and quantification using polyaniline nanowires-gold nanoparticles hybrid network. The sensor was fabricated by facile electrochemica ...
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Journal ArticleBiotechnology and bioengineering · February 2009
The sensitivity of a conceptual model of a foam emulsion bioreactor (FEBR) used for the control of toluene vapors in air was examined. Model parametric sensitivity studies showed which parameters affect the removal of toluene (as model pollutant) in the FE ...
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Journal ArticleEnvironmental science & technology · November 2008
The presence of volatile methyl siloxanes (VMSs) presents challenges for using landfill and digester gases as energy fuels because of the formation of silicon dioxide deposits during combustion. This study looks at the feasibility of using biological treat ...
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Journal ArticleWater research · November 2008
The removal of gaseous ammonia in a system consisting of a biotrickling filter, a denitrification reactor and a polishing bioreactor for the trickling liquid was investigated. The system allowed sustained treatment of ammonia while preventing biological in ...
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Journal ArticleEnvironmental science & technology · October 2008
Hydrogen sulfide (H2S) is a very common odor nuisance which is best controlled by chemical or biological scrubbing. Under alkaline pH, the amount of H2S that can be solubilized in a scrubbing liquid increases significantly, and therefore, gas-liquid mass t ...
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Journal ArticleNanotechnology · August 2008
The development of carbon nanotube-(CNTs-)based gas sensors and sensor arrays has attracted intensive research interest in the last several years because of their potential for the selective and rapid detection of various gaseous species by novel nanostruc ...
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Journal ArticleChemical Engineering Journal · May 15, 2008
Crystalline maghemite (γ-Fe2O3) nanoparticles were cathodically electrodeposited at room temperature from environmentally benign electrolytes. The shape, size, and production rate of nanoparticles were strongly influenced by electrochemical conditions (e.g ...
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Journal ArticleBiotechnology and bioengineering · April 2008
Recently, a new type of bioreactor for air pollution control referred to as the foamed emulsion bioreactor (FEBR) has been developed. The process relies on the emulsion of an organic phase with a suspension of an actively growing culture of pollutant-degra ...
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Journal ArticleChemosphere · March 2008
Removal of hydrogen sulfide from waste and energy-rich gases is required, not only because of environmental health and safety reasons, but also because of operational reasons if such gases have to be used for energy generation. A biotrickling filter for th ...
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Journal ArticleApplied Physics Letters · February 25, 2008
This letter reports a simple and scalable method to create mechanical joints and electrical contacts of conducting polymer nanowires to electrodes by selective maskless metal electrodeposition on electrodes. This is an attractive route for contacting nanow ...
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Journal ArticleChemical Engineering Science · February 1, 2008
Correlations that allow determination of gas film mass transfer coefficients (kG at, kG aw) and liquid film mass transfer coefficients (kL aw) for packing materials used in biofilters and biotrickling filters for air pollution control are presented. Lava r ...
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Journal ArticleChemical Engineering Science · February 1, 2008
Gas film mass transfer coefficients (kG at, kG aw) and liquid film mass transfer coefficients (kL aw) for packing materials used in biofilters and biotrickling filters for air pollution control were determined experimentally. Lava rock, polyurethane foam c ...
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Journal ArticleChemosphere · January 2008
The feasibility of using biotrickling filters for the removal of mercury vapor from simulated flue gases was evaluated. The experiments were carried out in laboratory-scale biotrickling filters with various mixed cultures naturally attached on a polyuretha ...
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Journal ArticleAIChE 100 - 2008 AIChE Annual Meeting, Conference Proceedings · 2008
ZnO is an interesting and versatile material due to its ample material properties and diverse applications. ZnO is an n-type direct and wide band gap semiconductor with band gap of 3.35eV, it has excellent chemical and thermal stability, photonic propertie ...
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Journal ArticleEnvironmental Progress · October 1, 2007
Oxidation of dilute TCE vapors in a foam reactor using Fenton's reagent was investigated. The new process relies on rapid mass transfer from the gas undergoing treatment to a fine aqueous foam and oxidation by Fenton's reagents. Laboratory investigations d ...
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Journal ArticleEnvironmental technology · September 2007
Emissions of H2S from publicly owned treatment works is a serious problem, therefore collection and treatment of these emissions is essential. In this work, the performance of a bench scale activated sludge system used for the removal of H2S from foul air ...
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Journal ArticleJournal of Physical Chemistry C · May 3, 2007
We developed a simple and cost-effective fabrication technique to construct a hydrogen nanosensor by decorating single-walled carbon nanotubes with Pd nanoparticles. By varying the sensor's synthesis conditions (e.g., Pd electrodeposition charge, depositio ...
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Journal ArticleNanotechnology · April 25, 2007
We have demonstrated a NH3, NO2 and water vapour sensor based on poly(m-aminobenzene sulfonic acid) functionalized single-walled carbon nanotube (SWNT-PABS) networks. The SWNT-PABS based sensors were fabricated by simple dispersion of SWNT-PABS on top of p ...
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Journal ArticleEnvironmental science & technology · February 2007
Biological reduction of perchlorate by autotrophic microorganisms attached to zerovalent iron (ZVI) was studied in flow-through columns. The effects of pH, flow rate, and influent perchlorate and nitrate concentrations on perchlorate reduction were investi ...
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Journal ArticleBiodegradation · February 2007
Contamination of groundwater with the gasoline additive methyl tert-butyl ether (MTBE) is often accompanied by many aromatic components such as benzene, toluene, ethylbenzene, o-xylene, m-xylene and p-xylene (BTEX). In this study, a laboratory-scale biotri ...
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Journal ArticleJournal of the Air & Waste Management Association (1995) · November 2006
Four different biofilter packing materials (two porous ceramics, perlite, and open pore polyurethane foam) were compared for the removal of toluene vapors. The focus was on evaluating performance at relatively short gas retention time (13.5 and 27 sec). Th ...
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Journal ArticleEnvironmental technology · June 2006
In the present paper, the potential of the foamed emulsion bioreactor (FEBR), a novel biological reactor for air pollution control was evaluated. Experimental data obtained on a laboratory-scale prototype were used to scale-up the process for a hypothetica ...
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Journal ArticleEnvironmental science & technology · February 2006
A series of batch experiments were performed to study the combination of zero-valent iron (ZVI) with perchlorate-reducing microorganisms (PRMs) to remove perchlorate from groundwater. In this method, H2 produced during the process of iron corrosion by wate ...
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Journal ArticleEnvironmental science & technology · February 2006
Effective cometabolic biodegradation of trichloroethylene (TCE) vapors in a novel gas-phase bioreactor called the foamed emulsion bioreactor (FEBR) was demonstrated. Toluene vapors were used as the primary growth substrate for Burkholderia cepacia G4 which ...
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Journal ArticleElectroanalysis · January 1, 2006
We demonstrate a facile fabrication method to make chemical gas sensors using single-walled carbon nanotubes (SWNT) electrochemically functionalized with polyaniline (PANI). The potential advantage of this method is to enable targeted functionalization wit ...
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Journal Article · December 1, 2005
Bio trickling filtration is one of the many promising biological techniques forodor and VOC control. Contrary to bio filters that are usually packed with some sort of organic medium and are operated with a minimum of free water(Devinny et al. 1999), bio tr ...
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Journal Article · December 1, 2005
To Modeling Biological treatment of contaminated air in bio filters and bio trickling filters involves a complex combination of physical, chemical, and biological processes. This makes it very difficult to mentally understand and integrate the subtle detai ...
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Journal ArticleAIChE Annual Meeting, Conference Proceedings · December 1, 2005
Semiconducting single-walled carbon nanotube (SWNT) and conducting polymers nanowires are promising 1-D nanomaterials for chemical and biological sensor applications. With its unique electrical, thermal and mechanic properties, SWNT has shown promise for s ...
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Journal ArticleBiotechnology and bioengineering · November 2005
Continuous operation of a new bioreactor for air pollution control called the foamed emulsion bioreactor (FEBR) has been investigated. The effect of several liquid feeding strategies was explored. The FEBR exhibited high and steady toluene removal performa ...
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Journal ArticleChemical Engineering Journal · October 20, 2005
A dynamic model to describe ammonia removal in a gas-phase biofilter was developed. The mathematical model is based on discretized mass balances and detailed nitrification kinetics that include inhibitory effects caused by free ammonia (FA) and free nitrou ...
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Journal ArticleChemical Engineering Journal · October 20, 2005
The removal of H2S in high performance biotrickling filters was investigated using a differential biotrickling filter. The differential biotrickling filter was designed to reach high gas velocities through a minature packed bed, in this case a single 4-cm ...
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Journal ArticleEnvironmental Progress · October 1, 2005
A literature study was conducted to compare the feasibility of biofilters and biotrickling filters for the treatment of complex odorous waste air containing hydrogen sulfide (H 2S), organic reduced sulfur compounds, and chlorinated and nonchlorinated volat ...
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Journal ArticleAIChE Journal · March 1, 2005
Chemical engineers are uniquely poised to contribute in the emerging area of environmental biotechnology, since many of the potential solutions require a combined perspective from modern biology and process engineering, two areas where chemical engineers e ...
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Journal ArticleJournal of Industrial and Engineering Chemistry · December 1, 2004
Biomass accumulation is a major obstacle for long-term, stable operation of biotrickling filters treating high loadings of volatile organic compounds (VOCs). Clogging reduces pollutant removal and increases the pressure drop in biotrickling filters. Severa ...
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Journal ArticleProceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA · December 1, 2004
Bioreactors for air pollution control have been proposed for a range of unconventional and novel applications. Probably one of the largest potential applications is the treatment of combustion gases from stationary sources. Several studies have addressed t ...
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Journal ArticleProceedings of the Air and Waste Management Association's Annual Meeting and Exhibition · December 1, 2004
The control of particulate matter (PM) in three lab-scale gas-phase bioreactors was studied. The three reactors include - compost-woodchip biofilter, polyurethane foam biotrickling filter and biotrickling filter packed with Pall-rings. Particle removal was ...
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Journal ArticleProceedings of the Air and Waste Management Association's Annual Meeting and Exhibition · December 1, 2004
Disinfection experiments were performed using a custom built 0.46 × 0.46 m (cross-section) by 4.3 m long wind tunnel fitted with a commercially available UV-C lamp unit operated under conditions usually found in HVAC systems (air velocities of 2000-9500 m/ ...
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Journal ArticleProceedings of the Air and Waste Management Association's Annual Meeting and Exhibition · December 1, 2004
A dynamic model for describing the behavior of a biotrickling filters for the treatment of the ammonia odor was developed. At this time, the model was not validated, but independent experiments will later serve to calibrate the model, so that it can be fur ...
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Journal ArticleProceedings of the Air and Waste Management Association's Annual Meeting and Exhibition · December 1, 2004
This paper evaluates treatment of odorous compounds (hydrogen sulfide, reduced sulfur compounds, VOCs, ammonia, and total odor) in wet chemical scrubbers that were converted to biotrickling filters at the Orange County Sanitation District (OCSD), Californi ...
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Journal ArticleProceedings of the Tenth International Conference Ground Penetrating Radar, GPR 2004 · December 1, 2004
Biofiltration is a biologically based technique for air pollution control. While biofilters are a major step forward for environmental protection, some problems such as heterogeneities in the packed bed exist. Ground penetrating radar (GPR) holds promise f ...
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Journal ArticleJournal of Membrane Science · November 15, 2004
A laboratory-scale membrane filtration cell was constructed to enable direct microscopic observation of microbial cell deposition and release in cross-flow microfiltration. Initial deposition rates determined from microscopic images were interpreted throug ...
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Journal ArticleJournal of Environmental Engineering · October 1, 2004
Until recently, biological treatment of odors in biofilters or biotrickling filters was thought to require a longer gas contact time than chemical scrubbing, hence bioreactors for air treatment required a larger footprint. This paper discusses the conversi ...
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Journal ArticleJournal of Environmental Engineering · March 1, 2004
The performance of a field-scale biotrickling filter was investigated for the treatment of styrene vapors released from a bathtub manufacturing process. The two-stage biotrickling filter was operated in series with an average gas flow rate of 350 m3 h-1 co ...
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Journal ArticleWater science and technology : a journal of the International Association on Water Pollution Research · January 2004
The present paper evaluates the technical and economical feasibility of converting wet chemical scrubbers to biotrickling filters for H2S control at the Orange County Sanitation District (OCSD), California. Results of 8 months of continuous operation of a ...
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Journal ArticleReport - University of California Water Resources Center · December 1, 2003
Development of an autonomous O2 delivery system for in-situ aerobic bioremediation is discussed. Individual parts of the system were tested, which required modification of the initial design of the proposed system. The focus of this development will be shi ...
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Journal ArticleBiotechnology and bioengineering · October 2003
A new type of bioreactor for air pollution control has been developed. The new process relies on an organic-phase emulsion and actively growing pollutant-degrading microorganisms, made into a foam with the air being treated. This new reactor is referred to ...
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Journal ArticleWater environment research : a research publication of the Water Environment Federation · September 2003
Laboratory-scale experiments and field studies were performed to evaluate the feasibility of biofilters for sequential removal of hydrogen sulfide and volatile organic compounds (VOCs) from wastewater treatment plant waste air. The biofilter was designed f ...
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Journal ArticleEnvironmental Progress · July 1, 2003
Emission of objectionable odors is a major problem for wastewater treatment and other processing facilities. Biological treatment is a promising alternative to conventional control methods, such as chemical scrubbing, but historically, biotreatment has alw ...
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Journal ArticleEnvironmental Progress · July 1, 2003
A dynamic model that describes the behavior of high-performance hydrogen sulfide (H2S)-degrading biotrickling filters for odor control was developed. The model attempts to accurately describe pollutant mass transfer in the biotrickling filter, i.e., extern ...
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Journal ArticleProceedings of the National Academy of Sciences of the United States of America · May 2003
Biological treatment is a promising alternative to conventional air-pollution control methods, but thus far biotreatment processes for odor control have always required much larger reactor volumes than chemical scrubbers. We converted an existing full-scal ...
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Journal ArticleEnvironmental science & technology · May 2003
Complete treatment of sulfur dioxide (SO2) from flue gases in a two-stage process consisting of a biotrickling filter followed by biological post-treatment unit was investigated. The biotrickling filter could remove 100% of influent SO2 from simulated flue ...
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Journal ArticleProceedings - International Conference on MEMS, NANO and Smart Systems, ICMENS 2003 · January 1, 2003
Biofilms form in nearly every environment that provides a surface, nutrients, and water. They can be found, for example, in almost all natural aquatic environments; on teeth, bone interstices, and oral epithelia of animals and humans; on hulls of marine in ...
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Journal ArticleWater environment research : a research publication of the Water Environment Federation · November 2002
A pilot-scale biotrickling filter was installed at the Hyperion Treatment Plant in Los Angeles, California, to study hydrogen sulfide (odor) and volatile organic compound (VOC) removal from headworks waste air. The performance of the reactor was continuous ...
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Journal ArticleWater environment research : a research publication of the Water Environment Federation · September 2002
This paper describes the progress up to June 2000 for thermophilic digestion of wastewater sludge at the Los Angeles, California, Bureau of Sanitation's Terminal Island Treatment Plant. The development of the microorganism culture has followed a course sim ...
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Journal ArticleEnvironmental science & technology · July 2002
Biotrickling filters for air pollution control are expected to encounter fluctuating conditions or periods without pollutant supply. In the present study, we investigated the effect of pollutant starvation in bench-scale biotrickling filters treating tolue ...
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Journal ArticleChemical Engineering Journal · May 28, 2002
Biological treatment is an emerging technology for the treatment of publicly owned treatment works (POTWs) off-gases. Most of POTWs off-gases contain H2S and a wide range of volatile organic compounds (VOCs). Since co-treatment of odors and VOCs in biotric ...
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Journal ArticleReport - University of California Water Resources Center · May 1, 2002
A study to understand the kinetics and microbiology fundamentals for Methyl tert-butyl ether (MTBE) biodegradation from which laboratory and field scale treatment systems may be designed. MTBE is most commonly used oxygenate, and it is estimated that the t ...
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Journal ArticleEnvironmental microbiology · June 2001
The widespread use of methyl tert-butyl ether (MTBE) as a gasoline additive has resulted in a large number of cases of groundwater contamination. Bioremediation is often proposed as the most promising alternative after treatment. However, MTBE biodegradati ...
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Journal ArticleEnvironmental science & technology · June 2001
The treatment of ethanol vapors in biotrickling filters for air pollution control was investigated. Two reactors were operated in parallel, one at ambient temperature (22 degrees C) and one at high temperature (53 degrees C). After a short adaptation phase ...
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Journal ArticleEnvironmental science & technology · February 2001
Recent research has indicated that up to 73% of the methyl bromide (MeBr) applied to agricultural farmland is ultimately emitted to the atmosphere despite the practice of complete coverage of the fields with polyethylene (PE) tarp. To reduce the emission o ...
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Journal ArticleACS National Meeting Book of Abstracts · December 1, 2000
Both microcosms and columns experiments were carried out to study the behavior of MTBE degrading consortium in laboratory and in soil-groundwater systems, and field bioremediation strategies were proposed. The MTBE degradation in microcosm was tested under ...
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Journal ArticleJournal of the Air & Waste Management Association (1995) · November 2000
The design and the construction of an actual 8.7-m3 pilot/full-scale biotrickling filter for waste air treatment is described and compared with a previous conceptual scale-up of a laboratory reactor. The reactor construction costs are detailed and show tha ...
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Journal ArticleApplied microbiology and biotechnology · July 2000
Pollutant degradation in biotrickling filters for waste air treatment is generally thought to occur only in the biofilm. In two experiments with toluene degrading biotrickling filters, we show that suspended microorganisms in the recycle liquid may substan ...
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Journal ArticleEnvironmental Technology (United Kingdom) · April 1, 2000
A new concept of periodically rotating biotrickling filters was developed for parallel operation of multiple bench scale biotrickling filters without the requirement for expensive equipment such as liquid recycle pumps and air flow regulation. The performa ...
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Journal Article · March 26, 2000
Microcosms and columns experiments were carried out to study the behavior of MTBE degrading consortium in laboratory in soil-groundwater systems and to propose meaningful field bioremediation strategies. MTBE was only seen in those microcosms operated unde ...
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Journal ArticleEnvironmental Science and Technology · February 1, 2000
A protocol has been developed for the rapid determination of complete elimination characteristics of target pollutants in waste air biofilters. The protocol involves the determination of two pollutant concentration profiles along the height of a three-segm ...
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Journal ArticleJournal of Environmental Quality · January 1, 2000
The bacterium, perclace, has been shown to reduce perchlorate to less than the detection limit of 0.004 mg L-1 when grown on acetate under anaerobic conditions. In batch studies, the presence of nitrate does not significantly hinder the reduction of perchl ...
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Journal ArticleBattelle Memorial Institute International In Situ and On-Site Bioreclamation Symposium Proceedings · December 1, 1999
Two parallel biotrickling filters were used to enrich the MTBE degrading aerobic microbial consortium and to study the performance of MTBE removal from synthetic waste gas. The same consortium can also degrade tert-butyl alcohol, a potential metabolite of ...
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Journal ArticleEnvironmental Science and Technology · September 1, 1999
Detailed experiments were performed with gas phase biotrickling filters treating vapors of methyl tert-butyl ether (MTBE), a gasoline additive of great environmental concern. A particular emphasis was placed on the analysis of the rate-limiting step, and i ...
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Journal ArticleEnvironmental Science and Technology · September 1, 1999
An aerobic microbial consortium able to biodegrade methyl tert-butyl ether (MTBE) was enriched in two waste air biotrickling filters after continuous operation for 6 months. After this acclimation phase, the two laboratory-scale biotrickling filters were a ...
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Journal ArticleJournal of the Air & Waste Management Association (1995) · August 1999
To date, biofilters have been used primarily to control dilute, usually odorous, off-gases with relatively low volatile organic compound (VOC) concentrations (< 1 g m-3) and VOC loads (< 50 g m-3 hr-1). Recently, however, U.S. industry has shown an interes ...
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Journal ArticleWater Research · July 1, 1999
A protocol was developed to rapidly assess the efficiency of chemical washing for the removal of excess biomass from biotrickling filters for waste air treatment. Although the experiment was performed on a small scale, conditions were chosen to simulate ap ...
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Journal ArticleBiotechnology Letters · January 1, 1999
The influence of the toluene concentration on predation of tuluene-degrading bacteria by the protozoa Tetrahymena pyriformis was investigated in suspended batch cultures continuously aerated with toluene-contaminated air. At gas phase concentrations of 0.0 ...
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Journal ArticleBiotechnology and bioengineering · January 1999
Two protozoan species as well as an uncharacterized protozoan consortium were added to a toluene-degrading biotrickling filter to investigate protozoan predation as a means of biomass control. Wet biomass formation in 23.6-L reactors over a 77-day period w ...
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Journal ArticleEnvironmental Progress · January 1, 1999
In the present paper, a general model was developed that allows the selection of the most cost-effective operation of biotrickling filters for air pollution control. The model was demonstrated for a typical case of industrial pollution: 10,000 m3 h-1 airst ...
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Journal ArticleEnvironmental Progress · January 1, 1999
A pilot/full-scale biotrickling filter reactor experiment was performed at an industrial site to treat styrene laden waste gas. The engineered system consisted of two stainless steel tanks in series, each with filter bed volumes of 4.0 m3, filled with 3.5- ...
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Journal ArticleProceedings of the Air & Waste Management Association's Annual Meeting & Exhibition · December 1, 1998
The performance of two toluene-degrading biotrickling filters was systematically investigated under different conditions of supply of toluene (0, 1 or 2 g/m3) and nutrients (feed of phosphate buffer or mineral medium). Two important results were obtained: ...
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Journal ArticleProceedings of the Air & Waste Management Association's Annual Meeting & Exhibition · December 1, 1998
Computed Axial Tomography (CAT) scanning was used for the first time to characterize the structure of packed beds biofilters and biotrickling filters used for waste air treatment. A detailed analysis of CAT scan images demonstrated the heterogeneities of t ...
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Journal ArticleCurrent opinion in biotechnology · June 1998
Recent studies in the area of biological waste air treatment in biotrickling filters have addressed fundamental key issues, such as biofilm architecture, microbiology of the process culture and means to control accumulation of biomass. The results from the ...
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Journal ArticleProceedings of the Air & Waste Management Association's Annual Meeting & Exhibition · December 1, 1997
The use of protozoa preying upon bacteria to decrease the rate of biomass accumulation in toluene-degrading biotrickling filters is investigated. As compared to a control filter without added protozoa, the filter enriched with a consortium of protozoa show ...
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Journal ArticleProceedings of the Air & Waste Management Association's Annual Meeting & Exhibition · December 1, 1997
Two bench-scale biofilters were operated using a commercially available media and a mixture of wood chips and compost to study the behavior of biofilters at high loads of binary volatile organic compound mixtures. Biofilter response to two frequently encou ...
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Journal ArticleJournal of the Air and Waste Management Association · September 1, 1997
Laboratory scale biological trickling filters and three-phase airlift bioreactors have been studied for the elimination of methylene chloride (or dichloromethane) vapors from waste air, and the results used herein for the design of small industrial-scale r ...
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Journal ArticleCurrent opinion in biotechnology · June 1997
Recent studies in the area of biological waste air treatment in biofilters have addressed fundamental key issues such as microbial dynamics, microscopical characterization of the process culture and oxygen and nutrient limitations. The results from these s ...
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Journal ArticleCurrent opinion in biotechnology · April 1997
Recent papers have described new bioreactor designs. Most innovations addressed either oxygen transfer, shear induced by stirring, control of water activity in organic phase systems or waste biotreatment. Innovations made during the past year were reported ...
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Journal ArticleBioprocess Engineering · January 1, 1997
The effects of changing operating conditions on the biooxidation of methyl ethyl and/or methyl isobutyl ketone in continuous flow enrichment culture are examined. Particular emphasis is placed on responses to step changes in feed stream concentrations and ...
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Journal ArticleJournal of Environmental Engineering · January 1, 1997
The work describes the aerobic biodegradation of volatile organic compound (VOC) mixtures from effluent air streams in laboratory-scale compost based biofilters. A rapid start-up of the system (3-5 d) was observed and 82% of the carbon in the influent poll ...
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Journal ArticleBiotechnology and bioengineering · March 1996
In the work reported here, selected aspects of the dynamic behavior of biofilters for waste air treatment have been investigated. Emphasis was placed on transient state elimination of mixtures of methyl ethyl ketone (MEK) and methyl isobutyl ketone (MIBK) ...
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Journal ArticleBioprocess Engineering · August 1, 1993
The work reported concerns the removal of mixtures of two ketones, methyl ethyl ketone (MEK) and methyl isobutyl ketone (MIBK), which find wide application as industrial solvents, from effluent air streams in downward flow biofilters operating at relative ...
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Journal Article · January 1, 1992
Microbiological waste gas treatment is a most promising new development in environmental biotechnology. Herein effective methyl ethyl ketone (MEK) vapour removal and effective methyl isobutyl ketone (MIBK) vapour removal from polluted air streams are demon ...
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