Study on the treatment of disperse blue E-4R dye wastewater by electro-flocculation-floatation method

The treatment of 400 mg/L disperse blue E-4R wastewater was studied by electro-flocculation-floatation method.The effects of reaction time,initial concentration,pH and adding sodium chloride(NaCl) and coagulant agents on the degradation of dye wastewater were investigated.The results showed that the color removal was enhanced as the reaction time increased and was decreased with the increase in dye concentration.pH in 2.5 to 10 ranges has relatively little effect on treatment efficiency.When the initial concentration was 400 mg/L,the color and TOC removal was 87.39% and 10.49% after reaction 20 min,respectively.Adding sodium chloride and coagulant agents enhanced the efficiency of treatment.When adding 50 mg/L sodium chloride,the color and TOC removal was up to 93.61% and 73.49%.The TOC removal was enhanced more than 60%.The treatment ability of three coagulant agents were that: aluminium sulfate[Al2(SO4)3·18H2O](aluminum chloride) ferrous sulfate,and the optimal amount of aluminium sulfate,aluminm chloride ferrous sulfate is 50,100 and 100 mg/L.