Resumo

ACERO, Julieth A.; AVENDANO-SANCHEZ, Amalia  e  BERMUDEZ-CASTANEDA, Ángela. Evaluation of the Fenton process for the treatment of a colored synthetic solution using mill scale. Ing. compet. [online]. 2023, vol.25, n.1, e-21712105.  Epub 30-Dez-2022. ISSN 0123-3033.  https://doi.org/10.25100/iyc.v25i1.12105.

The removal of synthetic dyes from the aqueous medium represents a great environmental challenge because of its complex chemical structure and low biodegradability. In this research, was evaluated the Fenton process for the treatment of a solution colored with methylene blue. Firstly, the application of the homogeneous Fenton method allowed to select an optimal hydrogen peroxide dose of 2.94 mM (100 mg/L) and an optimum ratio of 1:10 of Fe(II):H2O2, from which a 99.9% removal of the dye was obtained. Later, the heterogeneous Fenton process was developed using as catalysts three types of mill scale from steel transformation processes. From this process, where mill scale type 2 (high carbon was used), a dye degradation of 99.8% was obtained, as well as a COD elimination of 86.3% and 54.8% of TOC were reported. The latest was achieved using an optimum concentration of 15 g/L of mill scale, 2.94 millimolar (100 mg/L) of hydrogen peroxide, at pH 3 and with 6 hours of reaction. According to those results, it is concluded that the use of mill scale as a catalyst for the Fenton process is an alternative for wastes in the steel industry in the frame of sustainability and circular economy. It was also demonstrated that the first-order kinetic model fits appropriately to the degradation of methylene blue, by homogeneous Fenton and heterogeneous Fenton processes.

Palavras-chave : Heterogeneous Fenton; Mill scale; Dye; Methylene blue.

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