Treatment of effluent from a factory of paints using solar photo-fenton process

Abstract

We evaluated the use of Fenton reactions induced by solar radiation in the treatment of effluent from a factory of paints for buildings, after prior removal of the suspended solids. The increase of H2O2 concentration from 100 to 2500 mg L-1 for a [Fe2+] = 105 mg L-1 contributed to the reduction of DOC, COD, and toxicity. Our best results were achieved using 1600 mg L-1 H2O 2, with 90% of DOC and COD removal and a complete removal of the toxicity with respect to Artemia salina. Additionally, through increasing Fe2+ concentration from 15 to 45 mg L-1, the DOC removal rate increased 11 times, remaining almost constant in the range above 45 until 105 mg L-1. Under our best experimental conditions, 80% of DOC removal was achieved after an accumulated dose of 130 kJ m-2 of UVA radiation (82±17 min of solar irradiation under an average UVA irradiance of 34.1±7.3 W m-2), while 40% of DOC removal was reached after 150 min under only thermal Fenton reactions. The results suggest the effectiveness of implementation of solar photo-Fenton process in the decontamination and detoxification of effluents from factories of paints for buildings. © 2013 Alam Gustavo Trovó et al.