工业水处理 ›› 2024, Vol. 44 ›› Issue (3): 104-111. doi: 10.19965/j.cnki.iwt.2023-0129

• 试验研究 • 上一篇    下一篇

基于双极膜电渗析的矿井浓盐水资源化处理工艺研究

晋银佳1(), 王绍曾2, 郭栋1, 尤良洲1, 衡世权1   

  1. 1. 华电电力科学研究院有限公司,浙江 杭州 310030
    2. 中国华能集团有限公司,北京 100031
  • 收稿日期:2023-12-22 出版日期:2024-03-20 发布日期:2024-03-21
  • 作者简介:

    晋银佳(1986— ),博士,正高级工程师。E-mail:

  • 基金资助:
    国家重点研发计划重点专项项目(2022YFC3701500)

Study of mine concentrated brine water treatment technology based on bipolar membrane electrodialysis

Yinjia JIN1(), Shaozeng WANG2, Dong GUO1, Liangzhou YOU1, Shiquan HENG1   

  1. 1. Huadian Electric Power Research Institute, Hangzhou 310030, China
    2. China Huaneng Group Company Limited, Beijing 100031, China
  • Received:2023-12-22 Online:2024-03-20 Published:2024-03-21

摘要:

双极膜电渗析(BMED)工艺能够将矿井水膜浓缩系统产生的浓盐水转化为酸和碱,从而实现浓盐水的资源化处理。BMED系统的运行能耗较高,且其性能与系统的初始酸/碱浓度、电解质质量分数以及电流密度等参数密切相关,有必要对其进行优化研究,以降低系统运行成本。以某矿井水零排放处理系统产生的纳滤(NF)浓盐水和碟管式反渗透(DTRO)浓盐水为研究对象,采用BMED小试装置研究了不同初始酸/碱浓度、电解质质量分数以及电流密度工况下,BMED系统运行电压、酸/碱浓度、电流效率等变化情况。实验结果表明,实验条件下处理浓盐水,当初始酸/碱浓度为0.1 mol/L左右时,BMED产生的酸/碱浓度最高;BMED装置产生酸/碱的速度与电解质质量分数有关,电解质质量分数较低的工况下酸/碱浓度增加较快;此外,产生酸/碱的速度与电流密度呈正相关,而电流效率与电流密度呈负相关。对于NF浓盐水的处理,在初始酸/碱浓度为0.1 mol/L左右、电流密度控制在21 mA/cm2时经济性最高。此外,根据BMED系统的运行参数进行浓盐水资源化处理的成本收益测算,结果表明,采用双极膜电渗析工艺处理NF浓盐水的运行成本低于DTRO-蒸发结晶工艺,具有经济可行性。

关键词: 矿井浓盐水, 资源化处理, 双极膜电渗析, 经济分析

Abstract:

The bipolar membrane electrodialysis(BMED) process can transform the concentrated brine produced by the mine water membrane concentration system into acid and alkali,so as to realize the resource treatment of concentrated brine. The operating energy consumption of BMED is high,and its treatment performance is closely related to the initial acid/base concentrations,electrolyte concentration and current density of the system. So,it is necessary to study and optimize the operating parameters to reduce the operating cost of the system. In this paper,nanofiltration(NF) concentrated brine and disctube reverse osmosis(DTRO) concentrated brine produced by a zero discharge treatment system of mine water as research objects,the operating voltage,initial acid/base concentrations and current efficiency of the BMED were studied by using a bipolar membrane electrodialysis pilot system under different initial acid/base concentrations,electrolyte mass fractions and current densities. The experimental results showed that,for the treatment of concentrated saline,when the initial acid/base concentration was about 0.1 mol/L,the acid/base concentration produced by BMED was the highest. The rates of acid/alkali production in BMED devices was related to the electrolyte mass fraction,and the acid/alkali concentration increased rapidly under low electrolyte mass fraction conditions. In addition,the speed of acid and base generation in the BMED was positively correlated with the current density,while the current efficiency was negatively correlated with the current density. For the treatment of NF concentrated brine,the highest economic efficiency was achieved when the initial acid and base concentrations were both about 0.1 mol/L and the current density was controlled at 21 mA/cm2. In addition,according to the operation parameters of the BMED,the cost and benefit of the concentrated brine resource treatment were calculated. The results showed that the operation cost of the BMED process for NF concentrated brine was lower than that of the DTRO-evaporation crystallization process,and it was economically feasible.

Key words: mine high-salinity water, resourceful treatment, bipolar membrane electrodialysis, economic analysis

中图分类号: