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Influencing factors of bipolar membrane electrodialysis applied to regeneration of acid and base from high-salt wastewater

Authors： DONG Jun, LIU Chunhong, XUE Shangfeng , QI Zhifu, GAO Qiangsheng, DONG Yundi, SHEN Jiangnan

Units： 1. Zhejiang Energy Group R & D Co., Ltd, Hangzhou 311121, China; 2. Zhejiang Provincial Engineering Center for New Industrial Water Resources, Hangzhou 311121, China; 3.College of Chemical EEngineering, Zhejiang University of Technology, Hangzhou 310014, China

KeyWords： bipolar membrane electrodialysis; coal chemical industry; high-salt wastewater; zero discharge; sodium chloride

ClassificationCode：

year,volume(issue):pagination： 2023,43(1):116-126

Abstract：

The treatment of high-salt wastewater is the key process for zero-discharge of coal chemical wastewater. Bipolar membrane electrodialysis device (BMED) can convert salts into corresponding acids and bases, and reuse them in internal processes such as acid-base adjustment, which is of great significance for the resource utilization of coal chemical high-salt wastewater. In this paper, the process of “pretreatment-nanofiltration separation- reverse osmosis- secondary pretreatment-electrodialysis-BMED” was explored. NaCl solution was used to simulate nanofiltration production water as the raw water of BMED, and key factors in the preparation of NaOH and HCl from BMED was studied. The BMED with three-compartment configuration was used, and the main evaluation indexes such as base concentration, reaction rate, current efficiency and energy consumption were used to investigate the influencing factors such as the initial/residual salt concentration, current density, stack circulation flow, and the concentration and type of the electrode solution. The results show that in the NaCl initial mass fraction of 15%, residual mass fraction of 5%, current density of 500 A/m2, stack circulation flow of 90 L/h, and electrode solution of 3% NaOH, the NaOH concentration can reach 1.50 mol/L, the current efficiency is 60%, and the energy consumption is 2079 kWh/t-NaOH. The results can serve as a basis for promoting the industrial application of BMED to recycling high-salt wastewater from coal chemical industry.

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董隽（1988-），女，浙江杭州人，博士，高级工程师，研究方向为电厂化学环保

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