Engineering Board Exam Reviewer · Environmental Engineering · easy

COD (chemical oxygen demand) measures the oxygen required to:

1. Chemically oxidize organic matter using a strong oxidant
2. Support fish life
3. Biologically decompose only biodegradable matter
4. Dissolve gases in water

Answer

A. Chemically oxidize organic matter using a strong oxidant

Solution

COD is usually greater than BOD because it includes non-biodegradable matter. Potassium dichromate is the usual oxidant.

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