In sewage treatment, its sedimentation is speeded up by commonly adding__________________?
Correct answer: B. Lime
- A. Hydrochloric acid
- B. Lime
- C. Copper sulphate
- D. Sodium sulphate
Explanation
Lime promotes coagulation and floc formation in sewage, causing suspended particles to aggregate and settle more rapidly. The other listed chemicals are not commonly used to accelerate sewage sedimentation.
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