NEET Biology question
Match Column I (stage of sewage treatment) with Column II (what occurs at that stage).
| Column I | Column II | |---|---| | (A) Primary treatment | (1) Anaerobic digestion of sludge to produce biogas | | (B) Secondary treatment | (2) Physical removal of solids by filtration and sedimentation | | (C) Sludge digestion | (3) Discharge of treated effluent | | (D) Final disposal | (4) Aerobic microbial reduction of BOD in flocs |
Answer: (A)
Solution
Primary treatment physically removes solids (A-2), secondary treatment aerobically reduces BOD via flocs (B-4), sludge
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