Nitrification of anaerobic digester effluent for nitrogen management at swine farms.

Published

Journal Article

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 time, nitrifying sludge inoculation, and initial pH control on the startup of the nitrification system were investigated. The results showed that initial NH4+-N concentrations higher than 800 mg L−1 could severely inhibit the onset of nitrification if relying on native bacterial populations. When aeration time was increased from 4 to 12 h d−1, ammonium oxidation occurred earlier, but nitrite oxidation was delayed. However, the delay was not observed when bioaugmentation with nitrifying sludge was conducted. Initial addition of acid for pH control was unsuccessful as initial depletion of alkalinity eventually resulted in self-inhibition of nitrification cause by decreasing pH over time. Overall, these results provide guidance on how to effectively start large-scale innovative animal waste treatment systems.

Full Text

Duke Authors

Cited Authors

  • Xu, J; Vujic, T; Deshusses, MA

Published Date

  • December 2014

Published In

Volume / Issue

  • 117 /

Start / End Page

  • 708 - 714

PubMed ID

  • 25461938

Pubmed Central ID

  • 25461938

Electronic International Standard Serial Number (EISSN)

  • 1879-1298

International Standard Serial Number (ISSN)

  • 0045-6535

Digital Object Identifier (DOI)

  • 10.1016/j.chemosphere.2014.09.082

Language

  • eng