parameters for photocatalytic degradation from Chromium hexavalent to Chromium trivalent in a solar parabolic cylindrical from tanning

It is possible to demonstrate the photocatalytic degradation of Cr+6 to Cr+3 in simulated liquid effluents and tanneries using a parabolic solar concentrator capturing solar radiation with a radiation intensity of 875 W/m 2. The effluent samples received from the tanneries that were subsequently analyzed with respect to the concentrations of Cr+6 and Total Cr were carried out in the outlet well; based on the results, a sample was prepared that served as a simulation. From the results, the Total Cr is approximately 819.245 mg/L and According to the legal framework, the maximum permissible limit of effluents for sewage from tannery activities. The independent variables of the simulated liquid effluent sample were pH, temperature (T), flow (Q), hexavalent chrome concentration and dependent variables were the efficiency of the results, solar radiation and titanium dioxide concentration [TiO2]. The optimum processing values were: pH= 3.75; Q= 8.2; T= 30; [TiO2]= 30g. The results of the simulated samples were decreasing from 0.183 mg/L to the values of the maximum permissible limits (MPL) of 0.4 mg/l. In the results carried out before the photocatalytic treatment of the actual tannery sample from the Rio Seco Industrial Park, 326.95 mg/L was obtained, the concentration of hexavalent chromium was 173.28 mg/L. After the photocatalytic treatment, 58.85 mg/L and 25.89 mg/L were obtained respectively, with a reduction of the efficiency from 3 to 1.