Selectrodialysis with bipolar membrane for the reclamation of concentrated brine from RO plant
Selectrodialysis with bipolar membrane for the reclamation of concentrated brine from RO plant
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使用双极膜选择渗析回收 RO 装置中的浓盐水
DOI：
10.1016/j.desal.2018.04.031
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发表时间：
2018-09-15
期刊：
影响因子：
9.9
通讯作者：
Xu, Tongwen
中科院分区：
文献类型：
--
作者：
Chen, Binglun;Jiang, Chenxiao;Xu, Tongwen
反渗透（RO）由于其优异的脱盐性能，在过去的几十年中日益成为海水淡化的主导策略。它产生大量的浓盐水，这对伴随淡水生产的海洋生态系统构成威胁。电渗析已被证明是一种可行的盐水处理工艺。本论文首次提出了一种新型的处理浓盐水的方法--双极膜电渗析法（BMSED）。BMSED在艾德电堆内使用双极膜和单价选择性离子交换膜，从而将电渗析（SED）和双极膜电渗析（BMED）过程结合到一个步骤中。BMSED可以在单一路线中对浓盐水进行脱盐，选择性地再生单价离子并产生酸/碱。通过使用不同的商业膜，该过程的可行性进行了研究。考察了电流密度、盐水浓度等因素对电解质去除率的影响。结果表明，BMSED能成功地处理卤水，并最终得到高纯度的HCl和NaOH溶液（浓度可达2 mol/L左右）。因此，BMSED是一种环境和经济友好的RO浓盐水管理工艺。
Reverse osmosis (RO) is increasingly becoming the dominant strategy for seawater desalination owing to its excellent desalination performance over the past few decades. It produces a considerable amount of concentrated brine, which is a threat to marine ecosystems accompanying freshwater production. Electrodialysis has been demonstrated to be a feasible process for brine treatment. In this work, a novel process called Selectrodialysis with Bipolar Membranes (BMSED) was firstly proposed for treating concentrated brine. BMSED uses bipolar membranes and monovalent selective ion exchange membranes inside the ED stack and thus combines the selectrodialysis (SED) and bipolar membrane electrodialysis (BMED) processes into a single step. BMSED can desalinate concentrated brine, selectively regenerate monovalent ions and produce acids/bases in a single route. The feasibility of the process was investigated by using different commercial membranes. The factors, including the current density and brine concentrations, were investigated. The results indicated that brine was successfully treated by using BMSED and that a HC1 and NaOH solution (up to an approximate 2 mol/L concentration) with high purity was eventually produced. Therefore, BMSED is a pertinent environmentally and economically friendly process for RO concentrated brine management.