Recovery of nickel and water from nickel electroplating wastewater by electrodialysis
Recovery of nickel and water from nickel electroplating wastewater by electrodialysis
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DOI：
10.1016/j.seppur.2014.04.002
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发表时间：
2014-05-29
影响因子：
8.6
通讯作者：
Zoppas-Ferreira, J.
中科院分区：
文献类型：
--
作者：
Benvenuti, T.;Krapf, R. S.;Zoppas-Ferreira, J.
电过程是导致金属排放到环境中的主要活动之一。产生的废水含有大量的盐和金属，需要处理。采用电渗析（ED）法对光亮镀镍工艺出水中的镍及其盐类进行富集提取，以实现水和浓缩液回收再利用，节约工业资源和环境资源。应用实验室规模的ED系统处理基于工业浴液组合物的合成废水。对回收水和镍浓溶液的性能进行了分析，以验证其质量。将两种溶液用于镀镍工艺，分析其对镀层性能的影响。研究发现，ED处理产生的电导率非常低的溶液，可以作为冲洗水重复使用，并且可以产生浓缩溶液，可以将其输入槽中，以恢复在镀镍过程中因蒸发和拖出而损失的体积。在外观和耐腐蚀性方面，重复使用不会对镀件的质量造成任何损害。(c) 2014 Elsevier B.V.版权所有
Galvanic processes are one of the main activities contributing to metal discharges into the environment. The wastewater generated contains a high load of salts and metals that should be treated. In this work, the electrodialysis (ED) treatment was studied in order to concentrate and extract nickel (Ni) and its salts of effluents from the bright nickel electroplating process, aiming at water and concentrated solution recovery for reuse, and saving industrial and environmental resources. A laboratory-scale ED system was applied in the treatment of a synthetic effluent based on industrial bath composition. Properties of recovered water and nickel-concentrated solution have also been analyzed to verify their quality: Both solutions were used in the nickel-plating process in order to analyze their effects on the properties of electroplated pieces. It was found that ED treatment generates a very low conductivity solution, enabling its reuse as rinsewater, and a concentrated solution, which can be fed to the bath to recover volumes lost by evaporation and drag out during the nickel-electroplating process. The reuse does not cause any harm to the quality of plated pieces with regard to the visual aspects and corrosion resistance. (c) 2014 Elsevier B.V. All rights reserved.