NEET Biology question
Given below is the flowchart of sewage treatment. Identify A, B, C, D and E and select the correct option. Primary treatment → Primary sludge; Primary treatment → Effluent from primary settling tank → Secondary treatment: A → B → Sedimentation: C, Flocs → D → E → Biogas formation
Answer: (D)
Solution
Effluent from primary settling passes into a large aeration tank (A), where mechanical agitation (B) promotes microbial growth and organic matter consumption, reducing the
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