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- Title
TREATMENT OF PERSISTENT ORGANIC POLLUTANTS IN LED REACTOR USING FERROUS SULFATE AND IRON WASTE FOR FENTON PROCESS.
- Authors
Gonzaga dos Santos Júnior, Sérgio; da Rocha Santana, Rayany Magali; de Mendonça Gomes, Rayssa Kelen; Santos de Moraes, Nathália Farias; Michelle da Silva, Pollyanna; Guedes Paiva, Patrícia Maria; Andrade de Lucena, Alex Leandro; Elisandra do Nascimento, Graziele; Carla Napoleão, Daniella
- Abstract
The treatment of persistent pollutants in water is a subject of numerous researches around the world. In the present work, the degradation of a mixture of textile dyes by the photo-Fenton process was investigated. This was conducted under LED radiation, which has a reduced cost, employing iron in salt and residue forms. For homogeneous and heterogeneous processes, in acid medium, the effects of the H2O2 and iron concentrations were evaluated. The tests demonstrated that the homogeneous process was better conducted using 100 mg.L-1 of H2O2 and 2.0 mg.L-1 of iron, with 98% of degradation. For the heterogeneous study, H2O2 and iron residue concentrations of 100 mg.L-1 and 0.5 g.L-1, respectively, were used, obtaining a 92% of degradation. The residue used was characterized by FTIR analysis. Peaks related to the presence of Fe were observed. The kinetics of the processes were evaluated, with good adjustments to non-linear models of pseudo-first order, attaining values of linear regression greater than 0.94. Toxicity tests were carried out with seeds and bacteria. It was observed a possible formation of intermediates due to the increased toxicity for the solution treated by the heterogeneous process. Artificial neural networks were used to accurately predict the degradation of the dye mixture.
- Subjects
FERROUS sulfate; ARTIFICIAL neural networks; DEGRADATION of textiles; TOXICITY testing; WATER pollution
- Publication
Environmental Engineering & Management Journal (EEMJ), 2021, Vol 20, Issue 6, p883
- ISSN
1582-9596
- Publication type
Article