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Which of the following biological method shouldn’t be used for BOD load reduction?

(a) Oxidation ponds

(b) Activated sludge system

(c) Anaerobic biological method

(d) Chemical precipitation

This question was addressed to me in final exam.

This intriguing question comes from Wastewater Treatment of Food Processing Industries in chapter Wastewater Treatment of Food Processing Industries of Environmental Biotechnology

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Best answer
The correct answer is (d) Chemical precipitation

To explain: Biological methods such as Oxidation ponds by creating large space methods, activated sludge system which uses various microorganisms for treatment and Anaerobic biological method be used for BOD load reduction in waste water, Chemical precipitation is a chemical method and not a biological method.

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