What do you mean by Biochemical Oxygen Demand (BOD)?
Define Biochemical Oxygen Demand (BOD)
Biochemical oxygen demand is the amount of oxygen required by bacteria to decompose organic matter in a certain volume of sample of water. Clean water would have a BOD value of less than 5 ppm, whereas highly polluted water has a BOD value of 17 ppm or more
The amount of oxygen required by bacteria to breakdown the organic matter present in a certain volume of a sample of water is called Biochemical Oxygen Demand (BOD).
BOD - Biochemical Oxygen Demand
The water pollution by organic wastes is measured in term of BOD. It is the amount of dissolved
oxygen needed by bacteria in decomposing the organic wastes present in water.
Have you ever observed any water pollution in your area? What measures would you suggest to control it?
A large number of fish are suddenly found floating dead on a lake. There is no evidence of toxic dumping but you find an abundance of phytoplankton. Suggest a reason for the fish kill.