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 H2O2concentration from 100 to 2500 mg L−1for a [Fe2+] = 105 mg L−1contributed to the reduction of DOC, COD, and toxicity. Our best results were achieved using 1600 mg L−1H2O2, with 90% of DOC and COD removal and a complete removal of the toxicity with respect toArtemia 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−2of UVA radiation (82±17 min of solar irradiation under an average UVA irradiance of34.1±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.

Effective photochemical treatment of a municipal solid waste landfill leachate

“…After acidification (the second stage of the pretreatment), the equilibrium, in which the solids remained suspended due to the dispersant action of the additives, was disrupted, which led to the rapid precipitation of suspended solids. Partial color removal was also observed, most likely due to the adsorption of pigments on the surface of the solids [48]. The pretreatment of the raw leachate led to 100% removal of inorganic carbon, 98.7% ammonia removal and 20% removal of organic contaminants, as it is shown in Table 3.…”

Treatment of Sanitary Landfill Leachate by Photo-Fenton Process: Effect of the Matrix Composition

“…26,39,40 In general, it can be observed that the presence of inorganic ions (sulfate and chloride), and mainly the turbidity and apparent color, affect strongly the rate of mineralization of the organic load (Figures 3a and 3b) and consumption of H 2 O 2 (Figure 3c), since a higher reaction time was necessary to reach the same efficiency of DOC removal, between 70-77%, in raw leachate (Figures 3a and 3b). Therefore, in terms of application and based on the results obtained, the best protocol is the application of a pre-treatment using Fe 3+ , followed by the photo-Fenton process, since after only 2 hours a residual DOC concentration of 153 mg C L -1 was reached, with a consumption of 549 mg L -1 of H 2 O 2 , while a time and concentration of H 2 O 2 6 and 13 times higher, respectively, was necessary to treat the raw leachate.…”

“…These results are in agreement with the reported in other studies. 15,26 In addition, it is known that an excess of iron tends to compete with the organic matter by the hydroxyl radicals. 39 (Figure 1c).…”

“…[26][27][28] Besides, the presence of inorganic ions, such as chloride, sulfate, among others, can affect the efficiency of the photo-Fenton process.…”

Tratamento de efluente da produção de biodiesel utilizando processos físico-químicos e reações de Fenton

“…Por outro lado, houve necessidade de aplicar o processo foto-Fenton para remoção da fração orgânica solúvel (COD = 237 mg C L -1 e DQO = 672 mg O2 L -1 ), bem como toxicidade, alcançando 90% de remoção de COD e DQO e completa remoção da toxicidade para A. salinaGOMES;. da lavagem do biodiesel.…”