Treatment of Effluent from a Factory of Paints Using Solar Photo-Fenton Process

摘要

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 H_2O_2 concentration from 100 to 2500 mg L~(-1) for a [Fe~(2+)] = 105 mg L~(-1) contributed to the reduction of DOC, COD, and toxicity. Our best results were achieved using 1600 mg L~(-1) H_2O_2, with 90% of DOC and COD removal and a complete removal of the toxicity with respect to Artemia salina. Additionally, through increasing Fe~(2+) 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.