Select the correct statement about BOD.

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Organic matter in sewage and BOD are directly proportional.

The BOD value of sewage increases after sewage treatment.

The BOD value of sewage is unchanged in secondary sewage treatment.

BOD does not depend on the pollution level of sewage.

answer is A.

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Detailed Solution

Biochemical Oxygen Demand (BOD) is a measure of the amount of dissolved oxygen consumed by microorganisms while they decompose organic matter in water, typically found in sewage or wastewater. So, organic matter in sewage and BOD is directly proportional because higher organic matter content in sewage results in a higher demand for oxygen during the decomposition process, leading to an increased BOD value. This relationship is crucial in assessing water quality and the potential impacts of sewage discharge on the health of aquatic ecosystems.

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