How to reduce COD value of water sample ?

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Mohamed Hassaan

So you still need further treatment, or you can change chlorination with other methods because chlorination by products residual cause this higher COD

Alkhaled M. J.A

https://www.finishing.com/72/45.shtml

Hassan Alshamsi

Level of COD in water often correlate with organic material concentration.You can reduce concentration of heptahydrate sodium acetate in water by ozone oxidation.

Ali hussien Amteghy

http://antoine.frostburg.edu/chem/senese/101/glossary/f.shtml