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Design and Use of a Full Flow Sampling System FFS for the Quantification of Methane Emissions
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Methane emission from sewers.

Yiwen Liu1, Bing-Jie Ni1, Keshab R Sharma1

  • 1Advanced Water Management Centre, The University of Queensland, QLD, Australia.

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Sewer systems release significant methane due to methanogen activity. Controlling this methane emission requires careful consideration, as common sulfide-reducing chemicals also inhibit methane production.

Keywords:
EmissionGreenhouse gasMethaneMitigationSewer

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Area of Science:

  • Environmental Science
  • Microbiology
  • Wastewater Engineering

Background:

  • Sewer systems are identified as significant sources of methane (CH4) emissions.
  • Methane production occurs under anaerobic conditions by methanogens in sewer biofilms and sediments.
  • Simultaneous methane and sulfide production may result from the stratification of methanogens and sulfate-reducing bacteria.

Purpose of the Study:

  • To review recent studies on methane emission from sewer systems.
  • To explore methane production mechanisms, quantification, and modeling.
  • To discuss potential mitigation strategies for methane emissions in sewers.

Main Methods:

  • Review of existing scientific literature on methane production and emission in sewers.
  • Analysis of factors influencing temporal and spatial variations in methane production.
  • Examination of proposed mechanistic and empirical models for methane prediction.

Main Results:

  • Methane is primarily emitted at the sewage-atmosphere interface in sewers, with limited sinks identified.
  • Methane production exhibits dynamic variations influenced by hydraulic retention time, temperature, and organic matter concentration.
  • Chemicals used for sulfide control often suppress methane production, complicating mitigation efforts.

Conclusions:

  • Methane emission from sewers is a substantial environmental concern requiring further investigation.
  • Understanding the factors influencing methane production is crucial for developing effective control strategies.
  • Integrated approaches are needed to manage both methane and sulfide emissions in wastewater systems.