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Quantifying Methane Influx from Sewer into Wastewater Treatment Processes.

Yijun Yin1, Xiang Qi1, Lan Gao1

  • 1School of Environment, Tsinghua University, Beijing 100084, P. R. China.

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|May 23, 2024
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Wastewater treatment plants (WWTPs) emit significant methane (CH4). This study reveals sewer influx significantly impacts WWTP CH4 emissions, highlighting odor control systems as key for monitoring and mitigation.

Keywords:
A2O technologyemission factorgreenhouse gas emissionsmethanesewer systemwastewater treatment

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Area of Science:

  • Environmental Science
  • Environmental Engineering
  • Atmospheric Chemistry

Background:

  • Wastewater treatment plants (WWTPs) are significant sources of methane (CH4) emissions.
  • Current monitoring of CH4 emissions from WWTPs is challenging due to the
  • black box
  • nature of treatment processes.
  • The contribution of sewer-derived CH4 influx to overall WWTP emissions remains poorly understood.

Purpose of the Study:

  • To quantify CH4 emissions from WWTPs in China.
  • To investigate the impact of sewer CH4 influx on WWTP emissions.
  • To assess the potential of odor control systems for CH4 monitoring and mitigation.

Main Methods:

  • Quantified CH4 emissions from six WWTPs across China.
  • Utilized existing multizonal odor control systems for monitoring.
  • Conducted 24-hour online monitoring at the Guiyang WWTP.
  • Correlated CH4 fluctuations with water consumption and influent Chemical Oxygen Demand (COD).

Main Results:

  • In Beijing WWTP, nearly 90% of CH4 emissions originated from sewer pipes, affecting aerobic treatment zones.
  • Guiyang WWTP showed CH4 release at the inlet well, with fluctuations linked to water usage and COD.
  • Monitored CH4 emission factors ranged from 1.5 to 13.4 gCH4/kgCODrem, exceeding previous studies.
  • Odor control systems proved effective for CH4 tracing and monitoring.

Conclusions:

  • Sewer CH4 influx is a critical factor in WWTP emissions, often underestimated.
  • Odor control systems offer a viable and cost-effective method for CH4 management in WWTPs.
  • Accurate CH4 emission assessment requires accounting for sewer influx.