Dyeing and printing wastewater treatment based on coagulation-adsorption-oxidation

Dyeing and printing wastewater treatment is difficult,and has complicated treatment process.This paper studied the technological conditions of the dyeing and printing wastewater treatment by coagulation-adsorption-oxidation in order to improve the efficiency of the treatment.The result showed when adjusting the pH value of the wastewater to 5,using 1 000 mg/L PFS as coagulant,reacting for 1 min with 350 r/min agitation and 15 min 60 r/min agitation and standing for 30 min,adding 20 g/L activated carbon and 0.2 μL/mL H2O2 to the resultant wastewater,and reacting for 60 min with 350 r/min agitation at 25 ℃,the indexes of the treated wastewater were as the follows COD value 119 mg/L and chrominance 39 folds,and the former conforms to the international discharge standard Ⅰ,and the latter to Ⅱ.