도금폐수의 중금속 처리에 관한 연구

Abstract

Current process for treating plating waste water has disadvantage of complex steps which may cause economic and occupational hazard problems. The objects of this study is to develop the removal of heavy metals in plating wastewater by using Alum and FeCl3. The optimum conditions which used Alum appeared region of pH 8.0, 500㎎/ℓdosage of alkalinity, 440㎎/ℓdosage of coagulant and 9.0㎎/ℓdosage of electrolyte. And the optimum conditions using FeCl3 was range of pH 8.0, 400㎎/ℓdosage of alkalinity, 500㎎/ℓdosage of coagulant and 8㎎/ℓ of electrolyte. The removal rate of Cr in the supernatant which produced primary coagulation reached 96.9% by using of Alum, but 95.7% by using of FeCl3.