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Questions: 1. Why BOD standardized in ( mgO2/L)5 days (as BOD5)? What is the acceptable BOD level (mgO2/1) for drinking water? What is the indication

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Questions: 1. Why BOD standardized in ( mgO2/L)5 days (as BOD5)? What is the acceptable BOD level (mgO2/1) for drinking water? What is the indication of high level of BOD in water? 2. Why COD has become a commonly measured parameter for natural water media polluted with organic substances. 3. Explain the relationship between (1) DO and BOD, (2) BOD and COD

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