3 Difference Between B.O.D & C.O.D
Following are the 3 differences 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 carry out 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 carry out 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. |