Abstract
The present research evaluated treatment time, electrode area / effluent volume ratio, on the% reduction of hexavalent chromium in artificial chrome plating effluents, was evaluated by the batch electrocoagulation method; Method for which A-36 steel anodes and cathodes of (5.0 x 5.0 x 0.2) cm were used. The number of electrodes and the separation between them was varied in order to vary the ratio of electrode area / effluent volume and; for a batch type electrocoagulation reactor in which 27 tests were carried out; keeping the volume of effluent treated constant. From the results obtained, it was determined that the increase in the electrocoagulation time and the electrode area / effluent volume ratio influence the percentage of hexavalent chromium reduction of the artificial chromium plating, as supported by ANOVA and test F; the maximum reduction percentage achieved was 91.65%, with respect to the initial concentration (20 mg/L), for a test time of 60 minutes and a ratio of electrode area / effluent volume of 0.912 m2/L.
Highlights
The generic name of the electroplating sector is "surface treatment"
Reduction percentage of hexavalent chromium: Table 4 shows the average data corresponding to the amount of hexavalent chromium present after each electrocoagulation test; While in table 5, the average data corresponding to the percentage of reduction of hexavalent chromium of artificial chrome plating effluents are presented; after the application of the study variables, in the electrocoagulation process
The quantity of electrons supplied is the same, having a higher transfer capacity, slightly improving the cell current; the improvement in the reduction percentage is small, this could lead us to say as mentioned in Rodie and Hardenberg (1987); that electrical variables are the motor of electrocoagulation and in this case an improvement could occur with respect to the area / volume variable if and only if the voltage applied to the cell is increased
Summary
The generic name of the electroplating sector is "surface treatment". It is the process by which the characteristics of the surface of a base metal or other material are altered, by depositing a metallic coating that has desirable characteristics, carried out by means of electrolysis, in order to increase its ability to resist corrosive agents. and / or abrasives, improve their properties, their appearance and / or the usefulness of the metallic product. It has been found that chlorine ions can reduce the adverse effects of ions such as HCO3- and SO4= since the presence of carbonate or sulfate ions can lead to the precipitation of Ca+2 and Mg+2, producing an insoluble layer deposited on the electrodes that would increase the potential between them, decreasing the efficiency of the current It is recommended, that for a normal electrocoagulation process, amounts of Cl- are kept around 20%. The increase in efficiency with temperature is attributed to the increase in the destruction activity of the aluminum oxide film on the surface of the electrode (Ruiz, 2005)
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