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Journal of Chemistry
Volume 2014, Article ID 857625, 13 pages
http://dx.doi.org/10.1155/2014/857625
Research Article

Arsenic Removal from Natural Groundwater by Electrocoagulation Using Response Surface Methodology

1Facultad de Ingeniería Mecánica y Eléctrica, Universidad Autónoma de Coahuila, Avenida Barranquilla s/n, Colonia Guadalupe, C.P. 25750, 25760 Monclova, COAH, Mexico
2CINVESTAV IPN Unidad Saltillo Carretera Saltillo, Monterrey Km 13, Apdo. Postal 663, C.P. 25000, 25903 Saltillo, COAH, Mexico
3Facultad de Ingeniería, Universidad Autónoma de Coahuila, Edificio D Unidad Campo Redondo, Boulevard V. Carranza Esquina González Lobo, Colonia República Oriente, C.P. 25280, 25280 Saltillo, COAH, Mexico

Received 23 September 2013; Accepted 4 May 2014; Published 23 July 2014

Academic Editor: Huu Hao Ngo

Copyright © 2014 A. M. García-Lara et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Contamination of natural groundwater by arsenic (As) is a serious problem that appears in some areas of Northern Central Mexico (NCM). In this research, As was removed from NCM wells groundwater by the electrocoagulation (EC) technique. Laboratory-scale arsenic electroremoval experiments were carried out at continuous flow rates between 0.25 and 1.00 L min−1 using current densities of 5, 10, and 20 A m−2. Experiments were performed under galvanostatic conditions during 5 min, at constant temperature and pH. The response surface methodology (RSM) was used for the optimization of the processing variables (flow rate and current density), response modeling, and predictions. The highest arsenic removal efficiency from underground water (99%) was achieved at low flow rates (0.25 L min−1) and high current densities (20 A m−2). The response models developed explained 93.7% variability for As removal efficiency.