Question
Download Solution PDFConventionally, the biochemical oxygen demand (BOD) is measured for _______ days.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Biochemical Oxygen Demand (BOD):
- The amount of oxygen required by bacteria to break down the organic matter present in a certain volume of a sample of water is called Biochemical Oxygen Demand (BOD).
- Standard B. O. D. test is conducted at 3 and 5 days. 5 day B. O. D. test is conducted at 20oC and 3 day B. O. D. test is conducted at 27oC.
- Clean water would have BOD value of less than 5 ppm whereas highly polluted water could have a BOD value of 17 ppm or more
Computation of 5-day BOD of the test sample:
(BOD)5 = (DOi – DOf) × Dilution factor
Dilution factor = R/X
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