ESTUDIO DE REDUCCIóN FOTOCATALIZADA DE CROMO HEXAVALENTE

a methodology to decrease the chromium concentration cr(vi) existing in tannery discharges is suggested. the proposal is based on a photocatalytic process in which the effluent is irradiated by uv light in presence of tio2 as a catalyst employing formaldehyde as a reductor agent. were employed different cr(vi) solutions of 100 mg/l as models at different ph, catalyst quanties and irradiation times. the variable optimization was made from multivaried analysis. the better conditions for to reduction a 50 ml of a cr(vi) of 100 mg/l solutions were ph 2 at 20 minutes of uv irradiation and 40 mg of tio2 load. in these conditions it was possible a 97.8 % of cr(vi) reduction level. for a real effluent from tannery industries the reduction level was 81.3 %.