Sludge in separate tanks is decomposed to get biogas by

yeasts

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aerobic bacteria

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anaerobic bacteria

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none of these

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Solution

The correct option is C

anaerobic bacteria

Biogas is produced by anaerobic (oxygen-free) digestion of organic materials such as sewage sludge, animal waste, and municipal solid wastes.

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Question 3

Which of the following is/are products of wastewater treatment?
(a) Biogas
(b) Sludge
(c) Both biogas and sludge
(d) Aerator

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