The sewage water is treated to ______ BOD.

increase

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reduce

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maintain

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none of the above

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Solution

The correct option is B reduce
BOD (Biochemical Oxygen Demand) refers to the amount of the oxygen that would be consumed if all the organic matter in one litre of water were oxidised by bacteria.
The BOD test measures the rate of uptake of oxygen by micro-organisms in a sample of water and thus, indirectly, BOD is a measure of the organic matter present in the water.
The greater the BOD of waste water, more is its polluting potential. The sewage water is treated to reduce BOD.

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