Civil Engineering

3 Difference Between B.O.D & C.O.D

Following are the 3 difference between B.O.D (Biochemical oxygen demand) and C.O.D (Chemical oxygen demand) are described below:
 
B.O.D (Biochemical oxygen demand)
C.O.D (Chemical oxygen demand)
1. The amount of oxygen required to carryout the biological decomposition of dissolved solids in sewage under aerobic conditions at standard temperature is known as biochemical oxygen demand.
1. The amount of oxygen required to carryout the chemical decomposition of organic matters in sewage is known as chemical oxygen demand.
2. It is generally less than C.O.D.
2. In general, C.O.D of sewage is higher than B.O.D.
3. It indicates the amount of biologically active organic matter present in the sewage.
3. It indicates the amount of biologically active as well as biologically inactive organic matter present in the sewage.

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