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Treatment of effluents from cyanide-free electroplating processes by electrodialysis for recovering of water and inputs

Grant number: 14/13351-9
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): October 01, 2014
Effective date (End): September 30, 2017
Field of knowledge:Engineering - Chemical Engineering - Chemical Process Industries
Cooperation agreement: Coordination of Improvement of Higher Education Personnel (CAPES)
Principal researcher:Denise Crocce Romano Espinosa
Grantee:Tatiana Scarazzato
Home Institution: Escola Politécnica (EP). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Associated research grant:12/51871-9 - Study Center for Technology in Waste Solid Treatment and Recycling - SCTWSTR, AP.TEM
Associated scholarship(s):16/17527-0 - Evaluation of the selectivity of two anion exchange membranes for selective separation of an organic acid, BE.EP.DR   14/21943-3 - Study of ion transport through a selective membrane, BE.EP.DR


Part of electroplating operations uses cyanide-based substances as raw materials. However, its toxicity leads to the replacement of cyanide compounds. In addition, the disposal of inputs and the water consumption stimulate the development of methodologies for recovering and reusing raw materials and water. Conventional treatments of plating wastewaters involve cyanide oxidation, the formation of insoluble hydroxides, flocculation, precipitation and filtration. After treatment, it is obtained a sludge, which may contain traces of metals and cyanide. Membrane separation techniques, such as electrodialysis, can be used to promote the reuse of water and substances in the effluent, reducing the amount of sludge generated and consumption of natural resources. In an electrodialysis system, the migration of ions is governed by gradients of electrochemical potential. Interactions that influence the system performance mainly occur within the membrane and boundary layer diffusion. Therefore, studies on the properties of ion transport are necessary, especially when new substances are inserted to the system. This study aims to evaluate the application of electrodialysis for the treatment of effluents from cyanide-free electroplating processes and to study the transport properties of the ions in the effluent by ion-selective membranes. Electrochemical techniques, such as chronopotentiometry and an electrodialysis system in laboratory scale will be used. The main parameters to be evaluated are: the percentage extraction, the electrical resistance, the homogeneity, the permeselectivity, the current density limit, the transition time and the transport number of commercial membranes. (AU)

News published in Agência FAPESP Newsletter about the scholarship:

Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
SCARAZZATO, T.; PANOSSIAN, Z.; TENORIO, J. A. S.; PEREZ-HERRANZ, V.; ESPINOSA, D. C. R. Water reclamation and chemicals recovery from a novel cyanide-free copper plating bath using electrodialysis membrane process. DESALINATION, v. 436, p. 114-124, JUN 15 2018. Web of Science Citations: 5.
BARROS, KAYO SANTANA; SCARAZZATO, TATIANA; ROMANO ESPINOSA, DENISE CROCCE. Evaluation of the effect of the solution concentration and membrane morphology on the transport properties of Cu(II) through two monopolar cation-exchange membranes. Separation and Purification Technology, v. 193, p. 184-192, MAR 20 2018. Web of Science Citations: 5.
SCARAZZATO, T.; PANOSSIAN, Z.; TENORIO, J. A. S.; PEREZ-HERRANZ, V.; ESPINOSA, D. C. R. A review of cleaner production in electroplating industries using electrodialysis. JOURNAL OF CLEANER PRODUCTION, v. 168, p. 1590-1602, DEC 1 2017. Web of Science Citations: 29.
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
SCARAZZATO, Tatiana. Treatment of a cyanide-free copper electroplating solution by electrodialysis: study of ion transport and evaluation of water and inputs recovery.. 2017. Doctoral Thesis - Universidade de São Paulo (USP). Escola Politécnica São Paulo.

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