IGNOU AEC 1 2018 - Briefly discuss biochemical oxygen demand and chemical oxygen demand.

Question

Briefly discuss biochemical oxygen demand and chemical oxygen demand.

06 Mar 2018

Answer :

Word Count : 345

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.

BOD can be used as a gauge of the effectiveness of wastewater treatment plants.

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