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Environmental Issues

Question
CBSEENBI12047363
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During sewage treatment, biogases are produced, which include

  • methane, hydrogen sulphide and carbon dioxide

  • methane, oxygen and hydrogen sulphide

  • hydrogen sulphide, methane and sulphur dioxide

  • hydrogen sulphide, nitrogen and methane

Solution

A.

methane, hydrogen sulphide and carbon dioxide

Biogas is a mixture of gases (mainly methane) produced by the microbial activity and which may be used as fuel. During biogas production, the bacteria called methanogens digest the activated sludge and produce a mixture of gases such as methane, hydrogen sulphide, carbon dioxide and hydrogen.

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