Statistical optimization of arsenic removal from synthetic water by electrocoagulation system and its application with real arsenic-polluted groundwater.

Mendoza-Chávez, Claudia Erika; Carabin, Anne; Dirany, Ahmad; Drogui, Patrick ORCID: https://orcid.org/0000-0002-3802-2729; Buelna, Gerardo; Meza-Montenegro, María Mercedes; Ulloa-Mercado, Ruth Gabriela; Diaz-Tenorio, ​Lourdes Mariana; Leyva-Soto, Luis Alonso et Gortáres-Moroyoqui, Pablo (2021). Statistical optimization of arsenic removal from synthetic water by electrocoagulation system and its application with real arsenic-polluted groundwater. Environmental Technology , vol. 42 , nº 22. pp. 3463-3474. DOI: 10.1080/09593330.2020.1732472.

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Résumé

Arsenic presence in the water has become one of the most concerning environmental problems. Electrocoagulation is a technology that offers several advantages over conventional treatments such as chemical coagulation. In the present work, an electrocoagulation system was optimized for arsenic removal at initial concentrations of 100 µg/L using response surface methodology. The effects of studied parameters were determined by a 2³ factorial design, whereas treatment time had a positive effect and current intensity had a negative effect on arsenic removal efficiency. With a p-value of 0.1629 and a confidence of level 99%, the type of electrode material did not have a significant effect on arsenic removal. Efficiency over 90% was reached at optimal operating conditions of 0.2 A of current intensity, and 7 min of treatment time using iron as the electrode material. However, the time necessary to accomplish with OMS arsenic guideline of 10 µg/L increased from 7 to 30 min when real arsenic-contaminated groundwater with an initial concentration of 80.2 ± 3.24 µg/L was used. The design of a pilot-scale electrocoagulation reactor was determined with the capacity to meet the water requirement of a 6417 population community in Sonora, Mexico. To provide the 1.0 L/s required, an electrocoagulation reactor with a working volume of 1.79 m³, a total electrode effective surface of 701 m², operating at a current intensity of 180 A and an operating cost of 0.0208 US$/day was proposed. Based on these results, electrocoagulation can be considered an efficient technology to treat arsenic-contaminated water and meet the drinking water quality standards.

Type de document:	Article
Mots-clés libres:	electrocoagulation; response surface methodology; arsenic contaminated water; real groundwater; optimization
Centre:	Centre Eau Terre Environnement
Date de dépôt:	17 avr. 2020 18:37
Dernière modification:	15 févr. 2022 16:35
URI:	https://espace.inrs.ca/id/eprint/10102

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