含镉原水的超滤组合处理工艺

Combination Processes of Ultrafiltration Technology for Treatment of Cadmium-Containing Raw Water

采用实验室配制的含镉微污染原水,考察了直接超滤、混凝沉淀-超滤、粉末活性炭-混凝沉淀-超滤三种工艺对含镉原水的处理效果,结果表明三种工艺对含镉原水的处理效果受原水中镉的浓度影响较大。其中粉末活性炭-混凝沉淀-超滤组合工艺对含镉原水的处理效果较好,对浊度、氨氮、UV254去除率分别稳定在96%、90%、40%以上;当原水中镉浓度为0.02 mg/L左右时,对镉的去除率可达70%以上,出水镉含量达到饮用水标准。

The treatment effects of ultrafiltration, coagulation and sedimentation-ultrafiltration, powdered activated carbon-coagulation and sedimentation - uhrafiltration on cadmium-containing raw water prepared in the laboratory were investigated. The results show that concentration of cadmium has a great impact on treatment effect by the three processes. Powder activated carbon-coagula- tion and sedimentation-ultraiiltration has a better effect on treatment. The removal rates of turbidity, ammonia nitrogen and UV254 are 96 %, 90 % and 40 %, respectively. When the concentration of cadmium in raw water is about 0.02 mg/L, the removal rate of cadmi- um is 70 % and the effluent can meet the drinking water standards.