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What is biochemical oxygen demand (BOD) test? At what stage of Sewage treatment this test is performed?

Class XII
Microbes in human welfare


Amount of oxygen required in milligrams in five days by the microorganism of the polluted water to complete decomposition of organic matter present in one litre of water at 20 degree centigrate and its done to check the BOD of water which should less than 1ppm
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