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Microbes and Methanogenesis01:26

Microbes and Methanogenesis

Methanogenesis is a critical microbial process in anaerobic ecosystems responsible for the biological production of methane, a potent greenhouse gas and valuable biofuel. This metabolic pathway is primarily facilitated by methanogenic archaea, which thrive in anoxic environments such as wetlands, sediments, and animal gastrointestinal tracts. The absence of oxygen in these habitats prevents aerobic respiration, thereby favoring alternative biochemical pathways for organic matter degradation.In...
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Microorganisms are pivotal agents in Earth's biogeochemical cycles, significantly influencing climate dynamics through their metabolic activities. These microbes modulate the levels of key greenhouse gases by both contributing to and helping mitigate climate change.Microbial Contributions to Greenhouse Gas EmissionsRising global temperatures accelerate microbial metabolism, which, in turn, speeds up the decomposition of organic matter. This process releases carbon dioxide (CO₂) through...
Microbial Wastewater Treatment01:30

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Microbial Fuel Cells01:23

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Microbial fuel cells (MFCs) are bioelectrochemical devices that generate electricity by exploiting the metabolic processes of electrogenic bacteria. These systems provide a renewable energy source and serve as an innovative method for treating organic waste, such as wastewater.A typical MFC consists of two chambers: an anoxic (oxygen-free) compartment that houses the bacteria and an oxic (oxygen-rich) compartment that contains oxygen as the terminal electron acceptor. Many MFCs use proton...
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Environmental Applications of Microorganisms01:30

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Visualizing Methane-Cycling Microbial Dynamics in Coastal Wetlands
07:26

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Published on: January 31, 2025

Methane formation in sewer systems.

Albert Guisasola1, David de Haas, Jurg Keller

  • 1Advanced Water Management Centre, The University of Queensland, St. Lucia, 4067 Queensland, Australia. albert.guisasola@uab.cat

Water Research
|November 9, 2007
PubMed
Summary

Methane production in sewers is significant and linked to longer wastewater retention times. This greenhouse gas emission rivals energy use in wastewater treatment and impacts sulfide management.

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Design and Use of a Full Flow Sampling System (FFS) for the Quantification of Methane Emissions
08:18

Design and Use of a Full Flow Sampling System (FFS) for the Quantification of Methane Emissions

Published on: June 12, 2016

Area of Science:

  • Environmental microbiology
  • Wastewater engineering
  • Greenhouse gas emissions

Background:

  • Methane formation in sewers is understudied compared to hydrogen sulfide.
  • Sewer systems are significant environments for microbial activity and gas production.
  • Understanding microbial processes in sewers is crucial for environmental management.

Purpose of the Study:

  • To quantify methane production in sewer systems.
  • To investigate the correlation between methane production and hydraulic retention time.
  • To compare the contribution of methane production and sulfate reduction to COD loss.

Main Methods:

  • Field measurements in two rising mains with varying temperatures (26.6-28.4°C).
  • Laboratory-scale sewer system experiments using real sewage (approx. 21°C).
  • Analysis of microbial processes including methanogenesis and sulfate reduction.

Main Results:

  • Significant methane production was observed in sewer systems.
  • Methane production positively correlated with hydraulic retention time.
  • Methanogenesis contributed more to soluble Chemical Oxygen Demand (COD) loss than sulfate reduction.
  • Methanogenesis and sulfate reduction occur simultaneously.

Conclusions:

  • Methane production in sewers is a substantial environmental concern, potentially causing greenhouse gas emissions comparable to wastewater treatment energy consumption.
  • Methane production influences sulfide production and management due to microbial competition for electron donors.
  • Further research into the interactions between methanogens and sulfate-reducing bacteria in sewer networks is warranted.