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Municipal wastewater, also called sewage, is a complex mixture containing water usually over 99 percent) together with organic and inorganic contaminants, both suspended and dissolved.The concentration of these contaminants is normally very low and is expressed in mg/L,that is ,milligrams of contaminant per liter of the mixture.This is a weight-to-volume ratio used to indicate concentrations of constituents in water ,wastewater , industrial wastes, and other dilute solutions.

The amount of organic matter in water or wastewater can be measured directly (as TOC ,for example ) but this doesn’t tell us whether the organics are biodegradable or not.To measure the amount of oxygen by a growing microbial populayion to convert (oxidize)organic matter to CO2 and H2O in a closed system. .The oxygen consumed,or biochemical oxygen demand (BOD),is proportional to the organic matter converted ,and therefore BOD is a relative measure of the biologically degradable organic matter present in

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