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Define BOD. Calculate 3 days 36$^o$C BOD of sewage sample whose 5 days 20$^o$C BOD is 200 mg/lt. Assume KD at 20$^o$C as 0.1
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written 5.6 years ago by |
Biochemical Oxygen Demand (BOD, also called Biological Oxygen Demand) is the amount of dissolved oxygen needed (i.e. demanded) by aerobic biological organisms to break down organic material present in a given water sample at certain temperature over a specific time period. The BOD value is most commonly expressed in milligrams of oxygen consumed per litre of sample during 5 days of incubation at 20 °C and is often used as a surrogate of the degree of organic pollution of water.