Do not dose lime in colored ...
Published by soumen Basu, Process Design at Design & Operation of WTP,ETP , Drinking Water Project
Do not dose lime in colored water ,Feric coagulant ( FeCl3) is best for colored contain water , another way , You can dose Hypo chlorite (12%) in water,give retension time min 4 hr for it ,continue it 5 days ,ur water color will disappear .
For COD removal , pass it through Primary clarifier with proper chemical dosing , COD will be minimized .