In a sewage plant, BOD is indicated as high. After sometime it shows a decrease then

There is increase in bacterial growth but decrease in oxygen.

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There is decrease in bacterial growth but increase in oxygen.

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There is increase in bacterial growth but increase in oxygen.

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There is decrease in bacterial growth but decrease in oxygen.

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Solution

The correct option is B There is decrease in bacterial growth but increase in oxygen.
Biochemical oxygen demand (BOD) is the amount of dissolved oxygen needed by aerobic biological organisms in a body of water to break down organic material present in a given water sample at certain temperature over a specific time period. BOD can be used as a gauge of the effectiveness of wastewater treatment plants. It is listed as a conventional pollutant in the U.S. Clean Water Act.
Higher the BOD, more is the pollution.
Thus, if BOD had reduced, it shows decrease in bacterial growth which consumes the oxygen present and ensures increase in oxygen level.
Therefore, the correct answer is option B.

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