Non-biological methods for phosphorus and nitrogen removal from wastewater: A gap analysis of reinvented-toilet technologies with respect to ISO 30500.

Journal Article (letter;Journal Article)

The aims of the Reinvent the Toilet Challenge (RTTC) include creation of an off-the-grid sanitation system with operating costs of less than US$0.05 per user per day. Because of the small scale at which many reinvented toilets (RT) are intended to operate, non-biological treatment has been generally favored. The RTTC has already instigated notable technological advances in non-sewered sanitation systems (NSSS). However, increasingly stringent liquid effluent standards for N and P could limit the deployment of current RT in real-world scenarios, despite the urgent need for these systems. The newly adopted ISO 30500 standards for water reuse in NSSS dictate minimal use of chemical/biological additives, while at the same time requiring a 70% and 80% reduction in total nitrogen and phosphorus, respectively. This document provides a brief overview of the mature and emerging technologies for N and P (specifically ammonia/ammonium and orthophosphate) removal from wastewater. At present, the dearth of nutrient removal methods proven to be effective at small scales is a significant barrier to meeting ISO 30500 standards. Closing the gap between RTs and ISO 30500 will require significant investments in basic R&D of emerging technologies for non-biological N and P remediation and/or increased reliance on biological processes. Adaptation of existing nutrient-removal technologies to small-scale NSSS is a viable option that merits additional investigation.

Full Text

Duke Authors

Cited Authors

  • Trotochaud, L; Hawkins, BT; Stoner, BR

Published Date

  • January 2019

Published In

Volume / Issue

  • 3 /

Start / End Page

  • 559 -

PubMed ID

  • 32494770

Pubmed Central ID

  • PMC7232852

Electronic International Standard Serial Number (EISSN)

  • 2572-4754

International Standard Serial Number (ISSN)

  • 2572-4754

Digital Object Identifier (DOI)

  • 10.12688/gatesopenres.12931.2


  • eng