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Multi-circulation bipolar membrane electrodialysis treatment of coal chemical salt wastewater for preparation of acid and base

Authors： DONG Jun, XUE Shangfeng, LIU Chunhong, QI Zhifu, GAO Qiangsheng, 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 Engineering, Zhejiang University of Technology, Hangzhou 310014, China

KeyWords： coal chemical industry; salt-containing wastewater; bipolar membrane; electrodialysis; acid and base concentration

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2023,43(2):112-122

Abstract：

A multi-circulation bipolar membrane electrodialysis process is proposed to realize the production of high-concentration acid and base by low-concentration coal chemical salt-containing wastewater, thereby avoiding the pretreatment processes such as wastewater concentration and secondary hardening. Orthogonal design experiment is used to explore the influence of stack voltage, volume ratio of the salt and base (acid) chamber, and salt chamber cycle times on the reaction degree, acid and base concentration, purity, energy consumption, and current efficiency. The results show that the reaction will be hindered if the stack voltage is too low, or the volume ratio of the salt and base (acid) chamber is too large, or the salt chamber cycle times is too much. The cycle times is the most significant factor affecting the concentration of acid and base, and the volume ratio of the salt and base (acid) chamber is the most significant factor affecting the energy consumption and current efficiency. The optimized working parameters are determined after comprehensive analysis, i.e., the stack voltage of 28 V, the volume ratio of the salt and base (acid) chamber of 2:1, the salt chamber cycle times of 3. The corresponding base concentration is 1.3 mol/L, the acid concentration is 1.0 mol/L, the energy consumption is 3244 kWh/t-NaOH, and the current efficiency is 50%. The obtained acid and base are suitable for the pretreatment of wastewater in the system, and is beneficial to realize zero-discharge and resource-utilization of coal chemical salt-containing wastewater.

Funds：

浙江省重点研发计划项目（2021C03170）

AuthorIntro：

董　隽（1988－），女，浙江杭州人，博士研究生，高级工程师，研究方向为废弃物资源化；E-mail：zd_dongjun@zju.edu.cn

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