CIVIL SNAPS – ENVIRONMENTAL ENGINEERING
Biochemical Oxygen Demand
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It is the oxygen required for biological decomposition of organic matter present in sewage
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BOD test is conducted for 5 days or 10 days. The result after 5 days is about 68% and after 10 days is about 90% of the final result
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Test for BOD – Direct test and Dilution test
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Dilution test is most common
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After 5 days, BOD = Loss of oxygen x Dilution Ratio
CIVIL SNAPS – ENVIRONMENTAL ENGINEERING
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