First slide

Water Pollution and its Control

Question

Biochemical Oxygen Demand (BOD) may not be a good index for pollution for water bodies receiving effluents from

Moderate

A

domestic sewage
B

dairy industry
C

petroleum industry
D

sugar industry.

Solution

The amount of biodegradable organic matter in sewage water can be estimated by measuring Biochemical Oxygen Demand (BOD). Unlike domestic sewage, waste water from industries like petroleum, paper manufacturing, etc. often contain toxic substances, notably, heavy metals. which cannot be estimated by BOD.

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