During sewage treatment, biogases are produced which include:
methane, oxygen, hydrogen sulphide
hydrogen sulphide, methane, sulphur dioxide
hydrogen sulphide, nitrogen, methane
methane, hydrogen sulphide, carbon dioxide
According to the text, in anaerobic sludge digesters, bacteria digest other bacteria and fungi anaerobically. During this digestion, bacteria produce a mixture of gases such as methane, hydrogen sulphide, and carbon dioxide. These gases form biogas .
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