Desolve oxygen is an essential requirement of aquatic life I.e plant and animal population in any water body. Decrease in this dissolve oxygen value is an index of population mainly due to organic mattres. The amount of oxygen needed by a bacteria for biological oxidation in any unite volume of water is known as Biological oxygen demand. Biological oxygen demand is used as a measure of degree of water pollution and waste level. more the demand, more is the degree of pollution. Thermal pollution of water increase the biological oxygen demand which speed up the metabolism of aquatic living organisms.
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