Explain about biochemical oxygen demand.
Answers
Explanation:
Biochemical oxygen demand (BOD) represents the amount of oxygen consumed by bacteria and other microorganisms while they decompose organic matter under aerobic (oxygen is present) conditions at a specified temperature. When you look at water in a lake the one thing you don't see is oxygen.
Biochemical Oxygen Demand (BOD):- The water pollution which is done by organic wastes is being measured in terms of Biochemical oxygen demand. In other words it is the amount of dissolved oxygen (DO = Dissolved Oxygen) which is needed by bacteria in order to decompose the organic wastes available in the water
Special Points:-
1. BOD increased = water polluted
3. BOD is directly input of organic wastes.
3. As B.0.D. is increased the dissolved oxygen will get decreased in water.
4. Higher amount of organic waste leads in increasement in the rates of decomposiion in water.
5. O2 is rapidly consumed by microbes, therefore it may cause drop in DO content in water.
6. Daphnia is the indicator of BOD.