The maximum efficiency of BOD removal is achieved in
A. Oxidation pond
B. Oxidation ditch
C. Aerated lagoons
D. Trickling filters
Answer: Option B
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Oxidation Pond ~70–95% (50–90%)
Oxidation Ditch >95%, often ~98%
Aerated Lagoons ~80–95%
Trickling Filters ~75–90% (≈75%)
It's aerated lagoon
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