Q.

              is a by product of sewage treatment and can be decomposed to produce biogas.

A. Sewage
B. Sludge
C. Sewer
D. Scum
Answer» B. Sludge
Explanation: Sludge refers to the residual, semi-solid material that is produced as a by- product during sewage treatment of industrial or municipal wastewater. It can be used to produce biogas through a process called anaerobic digestion or fermentation.
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