Unit 2.1: Microbial Population

Background and Guiding Questions

Biogas is produced by fermenting bacteria and methanogens under anaerobic conditions and at optimal temperature, pH and environmental conditions. This process works best when fermenting bacteria and methanogens are balanced and working together. When conditions inside the digester change and fermenting bacteria and methanogens are no longer in balance, the digester is at risk of going “sour” and eventually ceases to produce biogas.

Guiding Questions

  • Why do fermenting bacteria and methanogens need to work together?
  • What is a “sour” digester and how can that be prevented?

 

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