The most commonly used substance to speed up the sedimentation of sewage is___________________?
Correct answer: A. Lime
- A. Lime
- B. Sulphuric acid
- C. Chlorine
- D. Sodium bisulphite
Explanation
Lime promotes coagulation and aggregation of suspended sewage solids, making them settle more rapidly during sedimentation. Sulphuric acid, chlorine, and sodium bisulphite serve different treatment purposes and are not the usual sedimentation aid here.
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