BOD is the amount of oxygen required for microbes to carry out the biological decomposition of the dissolved solids or the organic material in the sewage.

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"Biochemical oxygen demand (BOD) is a reliable gauge of organic pollution of the body of water."

BOD = (D1 – D2)/P Where,
D1 = initial dissolved oxygen concentration.
D2 = fifth day dissolved oxygen concentration.
P = volumetric fraction of wastewater.

How BOD measured?

Importance of BOD:

To find biodegradability of sewage samples.
For designing sewage treatment plants.
For measuring the self-purification capacity of a stream.

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