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Removal of arsenic from drinking water: A comparative study between electrocoagulation-microfiltration and chemical coagulation-microfiltration processes.

Mólgora, Cesar Calderon; Domínguez, Alejandra Martín; Avila, Eloy Mundo; Drogui, Patrick; Buelna, Gerardo (2013). Removal of arsenic from drinking water: A comparative study between electrocoagulation-microfiltration and chemical coagulation-microfiltration processes. Separation and Purification Technology , vol. 118 . p. 645-651. DOI: 10.1016/j.seppur.2013.08.011.

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Résumé

Experimental tests have been conducted to assess the effectiveness of a process combining electrocoagulation and microfiltration (EC-MF), which has been compared with a chemical coagulation coupled with microfiltration (CC-MF) for removal of arsenic (C-0 = 100 mu g/L) from drinking water. Different operating parameters such as iron concentration, reaction time, initial pH and degree of mixing inside the reactor were successively investigated. The best operating conditions (97% of As removal) were obtained at a pH of 7.0 and a concentration of 4.0 mg/L of Fe3+ using the CC-MF process. It took 26 h for the system to maintain a residual arsenic concentration below the limiting value (10 mu g/L) recommended by the World Health Organization (WHO). The treatment cost using CC-MF system was evatuated to USD$ 0.066 per cubic meter of treated water. By comparison, a treatment cost of USD$ 0.12 per cubic meter of treated water was recorded using EC-MF system operated in the best operating conditions (inter-electrode gap of 0.4 cm, a concentration of 4 mg/L of Fe3+ produced by anodic dissolution by maintaining a pH around 7.0). The residual arsenic concentration was maintained below the limiting value recommended during a period of 16 h of continuous mode operation.

Type de document:
Mots-clés libres: arsenic removal; drinking water; electrocoagulation; chemical coagulation; microfiltration
Centre: Centre Eau Terre Environnement
Date de dépôt: 06 déc. 2016 21:31
Dernière modification: 06 déc. 2016 21:31
URI: http://espace.inrs.ca/id/eprint/3477

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