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.

BOD is similar in function to chemical oxygen demand (COD), in that both measure the amount of organic compounds in water. However, COD is

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