Dear Carlos, If you are ...

Dear Carlos,

If you are using a bleaching agent, it may contain certain amount of chlorine in it as well. Probably due to this the sludge mass has mostly reverted back to anaerobic phase or is dead. Only due to this, the problem of darkening of colour is present. if you can segregate the water stream, and connect it post aeration and pre-filtration, your colour may improve. Only after this step, you may need to check whether the carbon that you have used has a good iodine value. If not, my advice will be to replace it.

 

Regards,

Sagar Apte