脱硫废水深度处理——电渗析浓缩规律研究  

Study on concentration of desulfurization wastewater by electrodialysis

作　　者：陈玉姿 项军 程鹏高[1,2] 张建平 王学魁[1,2] 唐娜 CHEN Yuzi;XIANG Jun;CHENG Penggao;ZHANG Jianping;WANG Xuekui;TANG Na(Tianjin University of Science&Technology,College of Chemical Engneering and Material,Tianjin 300457,China;Tianjin Key Laboratory of Brine Chemical Engineering and Resource Eco-utilization(Tianjin University of Science&Technology),Tianjin 300457,China)

机构地区：[1]天津科技大学化工与材料学院,天津300457 [2]天津市卤水化工与资源生态化利用重点实验室(天津科技大学),天津300457

出　　处：《膜科学与技术》2020年第5期85-94,共10页Membrane Science and Technology

基　　金：天津市自然科学基金项目(18JCZDJC37200)。

摘　　要：利用电渗析技术对山东魏桥某电厂脱硫废水进行处理,分别对脱硫废水进行1级1段以及多级电渗析和多段电渗析浓缩规律进行研究,测定了其极限电流,考察了膜对电压和膜面流速对电渗析浓缩过程中Cl^-浓度,SO^2-4浓度、电流、能耗、浓缩倍率以及电流效率的影响.结果表明:膜对电压对电渗析浓缩过程影响显著,随着膜对电压的增大,电流和能耗增大,当膜对电压达到1V时,电流效率均能达到70%以上;膜面流速对电渗析浓缩过程影响不明显,当膜面流速为2.05 cm/s时,离子迁移速率达到最高,确定最佳膜对电压为1V,最佳膜面流速为2.05 cm/s.7段电渗析和4级电渗析浓缩均能得到含盐质量分数15%的浓缩液,其中,Cl^-质量浓度为50 g/L,SO^2-4质量浓度为40 g/L,但4级电渗析能耗相对较高,为150 kW·h/m3,且有强烈的水迁移现象,倒换电极法能有效降低膜污染.In this paper, the electrodialysis technology is used to treat the desulfurization wastewater of a power plant in Weiqiao, Shandong Province. The first-stage electrodialysis, the multi-step electrodialysis and the multi-stage electrodialysis were studied respectively. The limiting current was measured. The factors of concentration of Cl-, SO42-, current, current efficiency, relative concentration ratio and energy consumption on electrodialysis were studied. The results showed that the effect of the cell-pair voltage on the concentration of electrodialysis is significant. With the increase of the voltage per cell pair, the current and energy consumption increase. When the cell-pair voltage reaches 1 V, the current efficiency could reach more than 70%. The flow rate has little effect on the concentration of electrodialysis. When the flow rate reaches 2.05 cm/s, the ion migration rate reaches the highest. The seven-step and four-stage electrodialysis can achieve an electrodialysis concentration effect with a salt content of 15%. At this time, the concentration of Cl- was 50 g/L, and the concentration of SO42- was 40 g/L. However, the four-stage electrodialysis was relatively simple, and the energy consumption was high(150 kW·h/m3), and the water migration phenomenon was obvious. Seven-step electrodialysis can produce more fresh water. However, the energy consumption of complicated process was low(140 kW·h/m3). Therefore, energy consumption can be reduced by multi-stage electrodialysis. The membrane pollution can be reduced effectively by reverse electrodialysis.

关 键 词：脱硫废水 电渗析﹔能耗 膜清洗 

分 类 号：TQ028.8[化学工程] X703[环境科学与工程—环境工程]