Write short note on BOD?

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written 6.9 years ago by

teamques10 ★ 70k

Biochemical oxygen demand (BOD) is the amount of dissolved oxygen needed by aerobic biological organisms in body of water or wastewater sample to break down organic material present in given water or wastewater sample at certain temperature (20°C) over a specific time period (5 days).
It’s used to assess the relative strength of a waste.
BOD is similar in function to COD in that both measure the amount of organic compounds in water however COD is less specific since it measures everything that can be chemically oxidized rather than just levels of biodegradable organic matter.
The BOD value is most commonly expressed in milligram (mL) of oxygen consumed per litre of sample of sample during 5 days of incubation at 20°C and is often used as a indicator of the degree of organic pollution of water.
Range: the clean river will have a 5 day BOD below 1mg/L. Moderately polluted rivers may have a BOD value in the range of 2 to 8 mg/L & river may severely polluted when BOD values exceeds 8mg/L.
There are two commonly recognized methods for the measurement of BOD.

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