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In which one of the following the BOD (Biochemical Oxygen Demand) of sewage (S), distillery effluent (DE), paper mill effluent (PE) and sugar mill effluent (SE) have been arranged in ascending order?

1. SE < PE < S < DE
2. PE < S < SE < DE
3. S < DE < PE < SE
4. SE < S < PE < DE

Correct answer: SE < PE < S < DE

Solution

BOD increases with the amount of biodegradable organic load. Sugar mill effluent is generally the least among these, paper mill effluent is higher, sewage is higher still, and distillery effluent is the highest because it contains very strong organic waste.

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