Hi Gaffar,   There are ...

Hi Gaffar,

There are many ways to reduce color and COD in any wastewater system as biological treatment (effective ins most of the cases to reduce COD and color), use of some oxidants (I think ozone is the best for the color removal) and other technoologies. Even you can use the biological treatment and after a clarification and filtration the ozone dosing, it will be really effective if after the biological you could continue hanving any residual COD or color.

If the COD is recalcitrat, it is not recommended the use of biological treatment, but you could continue considering on long run the ozone use due to its high effectiveness.

If we we want have a good and confidence system to remove the COD and color, we need know more information about this wastewater (industry, lab analysis, WWTP, flow, size of the plant and units, some operation description and other important data) that can drive to a good suggestions for your case.

Regards,

Orlando D. Gutiérrez Coronado