摘要：

为了研究电絮凝法对脱硫废水的处理效果及其作为反渗透预处理技术的作用，利用铁铝阳极电絮凝法对脱硫废水进行预处理，探讨工艺条件对电絮凝效果的影响，然后用反渗透法进一步处理出水，对比研究有无电絮凝时反渗透的膜性能，对絮凝体和阴极沉积物进行表征实验以分析电絮凝预处理脱硫废水的机理。结果表明：使用铁铝阳极可在短时间内实现较好的去除效果，最佳条件：反应时间为60 min、初始pH为8、电流密度为8 mA/cm²，污染物通过氧化、还原和絮凝反应被去除，在反渗透前进行电絮凝预处理，膜通量稳定在36.4 L/（m²·h），Zn²⁺、Pb²⁺ 、Mg²⁺、Ca²⁺、Cl^-总去除率分别为99.5%、99.3%、95.3%、91.0%、80.2%。电絮凝对脱硫废水有较好的净化效果，作为反渗透的预处理步骤能有效减少膜污染，提高出水质量。

关键词: 电絮凝, 脱硫废水, 预处理, 反渗透

Abstract:

In order to investigate the effect of electrocoagulation on desulfurization wastewater and its role as reverse osmosis pretreatment technology，the desulfurization wastewater was pretreated by electrocoagulation. Furthermore，the effects of key parameters on the removal efficiency were investigated. Then the reverse osmosis method was used to further treat the effluent，and the membrane performance with and without electrocoagulation was compared. The floc and cathode deposition were tested by characterization technique to study the electrocoagulation mechanism. The results showed that using Fe-Al anode，large removal efficiency could be achieved within a short time. The optimum conditions were as follows：electrocoagulation time 60 min，initial pH=8，current density 8 mA/cm².Pollutants were removed by oxidation，reduction and flocculation. Using electrocoagulation before reverse osmosis，the membrane flux stabled at 36.4 L/（m²·h） and the removal efficiency of zinc，lead，magnesium，calcium and chloride ions by electrocoagulation-reverse osmosis process were 99.5%，99.3%，95.3%，91.0% and 80.2% respectively. Electrocoagulation pretreatment could effectively reduce membrane pollution and improve the efficiency of reverse osmosis of desulfurization wastewater. The experimental results showed that the electrocoagulation was effective in the treatment of desulfurization wastewater. As a pretreatment step of reverse osmosis，it could effectively reduce membrane pollution and improve efficiency.

Key words: electrocoagulation, desulfurization wastewater, pretreatment, reverse osmosis

中图分类号: 

• X703.1