| Grant number: | 14/13351-9 |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| Start date: | October 01, 2014 |
| End date: | September 30, 2017 |
| Field of knowledge: | Engineering - Chemical Engineering - Chemical Process Industries |
| Agreement: | Coordination of Improvement of Higher Education Personnel (CAPES) |
| Principal Investigator: | Denise Crocce Romano Espinosa |
| Grantee: | Tatiana Scarazzato |
| Host 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 |
Abstract 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) | |
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