2015-Sustainable Industrial Processing Summit
SIPS 2015 Volume 11: Recycling & Environmental
| Editors: | Kongoli F, Havlik T, Pagnanelli F |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2015 |
| Pages: | 410 pages |
| ISBN: | 978-1-987820-34-8 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Internal Recycling in the Electroplating Industry: Electrodialysis to Minimize Environmental and Economic Costs
Tatiane Benvenuti1; Tiago Schmidt Souza1; Marco Antonio Siqueira Rodrigues2; Andrea Moura Bernardes1; Jane Zoppas Ferreira1;1UFRGS, Porto Alegre, Brazil; 2FEEVALE, Porto Alegre, Brazil;
Type of Paper: Regular
Id Paper: 11
Topic: 7
Abstract:
Galvanic processes are based on metal plating baths and rinsewater. They generate effluents with a metal concentration varying with the installed process. These solutions are usually treated using conventional physicochemical processes that generate the galvanic sludge that needs to be discharged in landfill sites. In the last decades, the economic conditions and the increasingly stringent environmental legislation worldwide have led the electroplating industry to adopt new technologies for the treatment of the waste generated. In fact, what is needed is an economical method for the removal of heavy metals from wastewater, but also for the recovery of these metals. Electrodialysis (ED) has already been used to treat many different water and wastewater streams to produce potable and industrial process water. In addition, ED is one of the most recent technologies that is applied to the recovery of plating chemicals from rinsewater. This process is based on the selective migration of aqueous ions through ion-exchange membranes resulting in an electrical driving force. In ED, low concentrations of heavy metals can be concentrated, and the other part of effluent water can be diluted for reuse. <br />Nickel plating effluent was treated by electrodialysis in bench scale and the quality of solutions produced was evaluated by chemical analysis. From the results obtained in these tests, an industrial-scale electrodialysis was evaluated in a continuous treatment process connected on a rinsewater line of nickel plating. It was determined the concentration of metals and other ions recovered for reuse as bath reinforcement. The diluted solution was again reused as rinsewater, reducing by 90% the volume of effluent sent to the wastewater treatment plant. The amount of chemicals used for the treatment of nickel electroplating rinsewater and the volume of nickel sludge were almost eliminated. ED provided a closed loop galvanic process, reducing environmental and economic costs.
Keywords:
Electroplating industry, nickel, electrodialysis, metal recovery, water reuseReferences:
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