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    				| 1. | Define pollution strength of wastewater on the basis of cod | 
| Answer» Answer: In environmental CHEMISTRY, the chemical OXYGEN demand (COD) is an indicative measure of the amount of oxygen that can be consumed by reactions in a measured solution. ... The most COMMON application of COD is in quantifying the amount of OXIDIZABLE POLLUTANTS found in surface water (e.g. lakes and rivers) or wastewater. | |