Engineering Board Exam Reviewer · Chemistry · medium

BOD (biochemical oxygen demand) is a measure of:

1. The dissolved oxygen in pure water
2. The hardness of water
3. The amount of oxygen needed by microorganisms to decompose organic matter in water
4. The amount of chlorine needed for disinfection

Answer

C. The amount of oxygen needed by microorganisms to decompose organic matter in water

Solution

High BOD indicates heavy organic pollution.

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