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Toward the Development of Efficient Electro-Fenton Reactors for Soil Washing Wastes through Microfluidic Cells

Rodríguez, M., Muñoz-Morales, M., Perez, J. F., Saez, C., Cañizares, P., Barrera-Díaz, C. E., Rodrigo, M. A.
Industrial & engineering chemistry process design and development 2018 v.57 no.31 pp. 10709-10717
aluminum, anodes, cathodes, chemical analysis, clopyralid, coagulation, electrochemistry, foams, hydrogen peroxide, liquid wastes, oxidation, oxygen, process design, reaction mechanisms, remediation, salts, soil, soil washing
This work focuses on the coupling of three different approaches into the same reactor at the same time: microfluidic cells, anodic oxidation with diamond anodes, and an electro-Fenton process. To supply oxygen a jet aerator was used and a CB/PTFE Duocel Al foam cathode was installed to promote the formation of hydrogen peroxide. This novel concept is applied for the direct treatment (without the addition of salts or other reagents) of soil washing wastes obtained in the remediation of soil spiked with clopyralid. Results obtained pointed out that this approach can increase the efficiency of the process by folds as compared to traditional treatment technologies. The chemical analysis of the intermediates showed different reaction mechanisms: anodic oxidation, electro-Fenton, and a negligible contribution of coagulation. The coupled systems studied in this work present several advantages such as high treatment efficiency and short treatment time which indicate that the development of electrochemical reactors for diluted liquid wastes is progressing in an adequate direction.