Impact of oxygen injection on CH4 and N2O emissions from rising main sewers

J Environ Manage. 2014 Nov 1:144:279-85. doi: 10.1016/j.jenvman.2014.04.023. Epub 2014 Jun 27.

Abstract

Oxygen injection is a commonly used mitigation strategy for sulfide control in sewers. Methane, a potent greenhouse gas, is also produced in sewers. Oxygen injection may reduce methane generation/emission, but could potentially lead to N2O production due to the development of a nitrifying microbial community. The impact of oxygen dosing for sulfide control in sewers on CH4 and N2O production was assessed in this study in laboratory sewer reactors. Results showed that oxygen injection is able to reduce CH4 formation in sewers, although full control of CH4 was not achieved, likely due to partial oxygen penetration into sewer biofilm. The experimental results also revealed a nitrogen loss of around 5 mN/L. However, no significant N2O accumulation was detected.

Keywords: Methane; Methanogen; Nitrous oxide; Oxygen; Sulfide.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Air Pollutants / metabolism*
  • Air Pollution / prevention & control*
  • Anaerobiosis
  • Archaea / drug effects
  • Archaea / physiology*
  • Biofilms / drug effects*
  • Greenhouse Effect / prevention & control
  • Methane / metabolism
  • Nitrous Oxide / metabolism
  • Oxygen / chemistry*
  • Sulfides / metabolism*

Substances

  • Air Pollutants
  • Sulfides
  • Nitrous Oxide
  • Methane
  • Oxygen