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Question : What is biochemical oxygen demand (BOD) test ? At what stage of Sewage treatment this test is performed? BOD level of three samples of water labelled as A,B and C are 30mg/L, 10mg/L and 500 mg/L respectively. Which sample of water is most polluted?

Answer»

SOLUTION :The BOD test MEASURES the rate of UPTAKE of oxygen by MICROORGANISMS in a sample of water. BIOLOGICAL treatment or secondary treatment
Sample .c. is most polluted because it has highest BOD level among the three sample of water.


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