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(D) : Marsh gas or methane $(CH_4)$ gas is mainly produced by the activities of anaerobic bacteria on sewage.Sewage contains large amounts of organic

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Marsh gas

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(D) : Marsh gas or methane $(CH_4)$ gas is mainly produced by the activities of anaerobic bacteria on sewage.Sewage contains large amounts of organic matter and microbes,many of which are pathogenic.These microbes (bacteria and fungi) are digested during the secondary treatment process of sewage by anaerobic bacteria.During this anaerobic digestion,bacteria produce a mixture of gases such as methane,hydrogen sulphide $(H_2S)$,and carbon dioxide $(CO_2)$.These gases are collectively called biogas and can be easily used as a source of energy as they are inflammable.

Which of the following is mainly produced by the activity of anaerobic bacteria on sewage?

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