Q3 of 58 Page 69

Methanogenic bacteria are not found in:

Methanogenic bacteria are a group of bacteria which releases methane gas as a by-product. These bacteria are Aerobic bacteria and thus, requires oxygen.

Therefore, from the given options only activated sludge consists of anaerobic conditions and it can’t have methanogenic bacteria. So, option d. activated sludge is the correct answer.

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