NEET 2014 Biology question

What gases are produced in anaerobic sludge digesters?

(1)Methane and CO only
(2)Methane, hydrogen sulphide and COCorrect
(3)Methane, hydrogen sulphide and O
(4)Hydrogen sulphide and CO

Answer: (2)

Solution

In secondary sewage treatment, the activated sludge is passed into anaerobic sludge digesters where anaerobic bacteria digest the bacteria and fungi of the sludge. During this digestion a mixture of gases - methane

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Question ID VK-091649