Biochemical Oxygen Demand -BOD- in a river waterRemains unchanged when algal bloom occurs-Has no relationship with concentration of oxygen in the water-Gives a measure of salmonella in the water-Increases when sewage gets mixed with river water-

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Sewage is waste water having food residue- animal and human excreta- detergent- discharges from-xA0-industrial and commercial establishments- Degree of impurity of water due to organic matter is measured in terms of BOD or biochemical oxygen demand- BOD is the oxygen in milligrams required for 5 days in one litre of water at 20 degree centigrade for the micro organisms to metabolise organic wastes- If the water- is polluted with sewage and other organic wastes- the BOD will increase-

Biochemical Oxygen Demand (BOD) in a river waterRemains unchanged when algal bloom occurs.Has no relationship with concentration of oxygen in the water.Gives a measure of salmonella in the water.Increases when sewage gets mixed with river water.

Biochemical Oxygen Demand (BOD) in a river water
Remains unchanged when algal bloom occurs.
Has no relationship with concentration of oxygen in the water.
Gives a measure of salmonella in the water.
Increases when sewage gets mixed with river water.