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首页> 美国卫生研究院文献>Membranes >Treatment of Cyanide-Free Wastewater from Brass Electrodeposition with EDTA by Electrodialysis: Evaluation of Underlimiting and Overlimiting Operations
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Treatment of Cyanide-Free Wastewater from Brass Electrodeposition with EDTA by Electrodialysis: Evaluation of Underlimiting and Overlimiting Operations

机译：EDTA电渗析处理黄铜电沉积中无氰废水的评估：超限和超限操作

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Growing environmental concerns have led to the development of cleaner processes, such as the substitution of cyanide in electroplating industries and changes in the treatment of wastewaters. Hence, we evaluated the treatment of cyanide-free wastewater from the brass electroplating industry with EDTA as a complexing agent by electrodialysis, aimed at recovering water and concentrated solutions for reuse. The electrodialysis tests were performed in underlimiting and overlimiting conditions. The results suggested that intense water dissociation occurred at the cathodic side of the commercial anion-exchange membrane (HDX) during the overlimiting test. Consequently, the pH reduction at this membrane may have led to the reaction of protons with complexes of EDTA-metals and insoluble species. This allowed the migration of free Cu and Zn to the cation-exchange membrane as a result of the intense electric field and electroconvection. These overlimiting phenomena accounted for the improvement of the percent extraction and percent concentration, since in the electrodialysis stack employed herein, the concentrate compartments of cationic and anionic species were connected to the same reservoir. Chronopotentiometric studies showed that electroconvective vortices minimized fouling/scaling at both membranes. The electrodialysis in the overlimiting condition seemed to be more advantageous due to water dissociation and electroconvection.
机译：越来越多的环境问题导致清洁工艺的发展，例如电镀行业中氰化物的替代以及废水处理的变化。因此，我们评估了通过电渗析以EDTA作为络合剂处理黄铜电镀行业中无氰化物废水的方法，旨在回收水和浓缩液以进行再利用。电渗析试验在极限和极限条件下进行。结果表明，在超限测试过程中，强烈的水离解发生在商业阴离子交换膜（HDX）的阴极侧。因此，该膜的pH降低可能导致质子与EDTA金属和不溶物的配合物反应。由于强电场和电对流，这使得游离的Cu和Zn迁移到阳离子交换膜上。这些超限现象说明了萃取百分率和浓度百分率的提高，因为在本文采用的电渗析堆中，阳离子和阴离子物质的浓缩室连接到同一容器中。计时电位研究表明，电对流涡流可最小化两个膜的结垢/结垢。由于水的分解和电对流，在极限条件下的电渗析似乎更有利。

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