Question

what is BOD? how BOD help in estimating the amount of waste in water

Answer 1

BOD (biochemical oxygen demand) . BOD refers to the amount of the oxygen that would be consumed if all the organic matter in one literary of water were oxidised by bacteria. BOD is a measure of the organic matter present in the water . The greater the BOD of waste water , more is its polluting potential

Answer 2

BOD=Biological oxygen demand.
when the oxygen percentage decreases in a aquatic area ,then it results a faul smell which is sign of BOD