McqMate
| 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 | |
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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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