Laboratoire de Thermique Energétique et Procédés (EAD 1932), ENSGTI, Pau, France.
Water Res. 2012 Jun 15;46(10):3364-76. doi: 10.1016/j.watres.2012.03.039. Epub 2012 Mar 28.
Hybrid ion exchange electrodialysis, also called electrodeionization (IXED), is a technology in which a conventional ion exchange (IX) is combined with electrodialysis (ED) to intensify mass transfer and to increase the limiting current density and therefore to carry out the treatment process more effectively. It allows the purification of metal-containing waters, as well as the production of concentrated metal salt solutions, which could be recycled. The objective of this paper was to investigate the ability of the IXED technique for the treatment of acidified copper sulphate solutions simulating rinsing water of copper plating lines. A single-stage IXED process at lab-scale with a small bed of ion exchanger resin with a uniform composition was evaluated, and the treatment performance of the process was thoroughly investigated. The IXED stack was assembled as a bed layered with the ion exchanger resin (strong acid cation-exchange Dowex™) and inert materials. The stack configuration was designed to prevent a non-uniform distribution of the current in the bed and to allow faster establishment of steady-state in the cell for IXED operation. The influence of operating conditions (e.g. ion exchanger resin with a cross-linking degree from 2 to 8% DVB, and current density) on IXED performance was examined. A response surface methodology (RSM) was used to evaluate the effects of the processing parameters of IXED on (i) the abatement yield of the metal cation, which is a fundamental purification parameter and an excellent indicator of the extent of IXED, (ii) the current yield or the efficiency of copper transport induced by the electrical field and (iii) the energy consumption. The experimental results showed that the performance at steady-state of the IXED operation with a layered bed remained modest, because of the small dimension of the bed and notably the current efficiency varied from 25 to 47% depending on the conditions applied. The feasibility of using the IXED in operations for removal of heavy metals from moderately dilute rinsing waters was successfully demonstrated.
混合离子交换电渗析，也称为电去离子（IXED），是一种将传统的离子交换（IX）与电渗析（ED）相结合的技术，用于增强传质并提高极限电流密度，从而更有效地进行处理过程。它允许净化含金属的水，并生产浓缩的金属盐溶液，这些溶液可以回收利用。本文的目的是研究 IXED 技术处理模拟镀铜线冲洗水的酸化硫酸铜溶液的能力。在实验室规模上进行了单级 IXED 工艺，使用具有均匀组成的小型离子交换树脂床进行评估，并彻底研究了该工艺的处理性能。IXED 堆由离子交换树脂（强酸阳离子交换 Dowex™）和惰性材料分层组成。堆的配置旨在防止床中电流的不均匀分布，并允许 IXED 操作更快地达到电池的稳态。考察了操作条件（例如交联度为 2%至 8%DVB 的离子交换树脂和电流密度）对 IXED 性能的影响。响应面法（RSM）用于评估 IXED 的加工参数对（i）金属阳离子的去除率的影响，去除率是基本的净化参数，也是 IXED 程度的极好指标，（ii）电流效率或电场诱导的铜传输效率，以及（iii）能耗的影响。实验结果表明，由于床的小尺寸，分层床的 IXED 操作的稳态性能仍然不太理想，特别是电流效率根据应用条件从 25%变化到 47%。成功证明了 IXED 在从中等稀释冲洗水中去除重金属的操作中的可行性。
