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Which chemical is added to the oxidation pond to avoid bad odor?

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Which chemical is added to the oxidation pond to avoid bad odor?

(a) Calcium chloride

(b) Sodium nitrate

(c) Potassium chloride

(d) Silver nitrate

I had been asked this question in semester exam.

This interesting question is from Oxidation and Stabilization Ponds in division Solid Waste Management, Aerobic & Anaerobic Stabilization Units of Environmental Engineering

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Right answer is (b) Sodium nitrate

The explanation is: Sodium nitrate is added to the oxidation pond to avoid bad odor. It acts as an oxidizing agent and also as the food of the plant.

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