A novel combined electrochemical-magnetic method for water treatment |
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Authors: | Ibanez Jorge G Vazquez-Olavarrieta Jorge Luis Hernandez-Rivera Lydia Garcia-Sanchez Martin Adolfo Garcia-Pintor Elizabeth |
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Affiliation: | Centro Mexicano de Quimica Verde y Microescala, Depto. de Ing. y Ciencias Quimicas, Universidad Iberoamericana-Ciudad de Mexico, Prol. Reforma 880, Mexico, D.F. 01219, Mexico. jorge.ibanez@uia.mx |
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Abstract: | Electrocoagulation (EC) is a wastewater treatment process in which aqueous pollutants can be removed by adsorption, entrapment, precipitation or coalescence during a coagulation step produced by electrochemically generated metallic species. When using Fe as the sacrificial electrode, Fe(2+) and Fe(3+) ions are formed. As Fe(3+) species are paramagnetic, this property can in principle be used to facilitate their removal through the application of a magnetic field. In the present work we present a proof-of-concept for a combined electrochemical-magnetic method for pollutant removal. For this approach, the amounts of Fe(2+) and Fe(3+) produced in an EC cell at various voltages were measured by spectroscopic methods to confirm that Fe(3+) species predominate (up to 84%). The effectiveness of the presence of a magnetic field in the precipitation of coagulants from a suspension was confirmed by monitoring the turbidity change versus time with and without exposure to a magnetic field, up to a 30% improvement. |
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