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Study on Concentration of Desulfurization Wastewater by Electrodialysis

Authors： Yuzi Chen1,2, Jun Xiang1,2, Penggao Cheng1,2, Jianping Zhang1,2, Xuekui Wang1,2, Na Tang1,2

Units： 1.Tianjin University of Science & Technology, College of Chemical Engneering and Material, Tianjin 300457；2. Tianjin Key Laboratory of Brine Chemical Engineering and Resource Eco-utilization (Tianjin University of Science & Technology), 300457, Tianjin, China

KeyWords： desulfurization wastewater; electrodialysis; energy consumption; membrane cleaning

ClassificationCode：TQ028.8; X703

year,volume(issue):pagination： 2020,40(5):85-94

Abstract：

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 can 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.

Funds：

天津市自然科学基金（18JCZDJC37200）

AuthorIntro：

陈玉姿（1993-），女，河北石家庄人，硕士研究生，研究方向：电渗析技术应用， E-mail：18232078520@mail.tust.edu.cn

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