Abstract
As Arsenic contamination in drinking water has become a matter of severe concern, researchers across the globe have been trying to develop an efficient yet economic method for removal of arsenic from water. Authors of this paper investigated combined treatment methodology namely, coagulation followed by microfiltration (MF) to remove arsenic below permissible level of 10 ppb. Simulated solutions of arsenate and arsenite salts (100 ppb) were prepared. A 95.83 % reduction of arsenic for arsenate solution and 91.99 % reduction of arsenic in case of arsenite solution were achieved in suitable pH range (8−10) when the solution was subjected to coagulation using ferric chloride coagulant, followed by MF using 0.45 µm polyethersulphone membrane. In search of more cost effective and ecofriendly yet viable route, authors explored the effectiveness of crushed Shelled Moringa oleifera Seed (SMOS) as a natural coagulant. A 91.01 % decontamination of arsenic for arsenate solution and 70.61 % for arenite solution were achieved in suitable pH range 7−9. This alternative method of coagulation, bio-adsorption (amino acid-arsenic interaction) followed by MF achieved in appreciable arsenic removal efficiency compared to inorganic Ferric Chloride, a synthetic coagulant. The sludge generated in case of ferric chloride was found to be toxic and highly corrosive compared to that obtained with Moringa oleifera seeds.
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Dutta, T., Bhattacherjee, S. (2015). Arsenic Removal Through Combined Method Using Synthetic Versus Natural Coagulant. In: Gupta, S., Bag, S., Ganguly, K., Sarkar, I., Biswas, P. (eds) Advancements of Medical Electronics. Lecture Notes in Bioengineering. Springer, New Delhi. https://doi.org/10.1007/978-81-322-2256-9_30
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DOI: https://doi.org/10.1007/978-81-322-2256-9_30
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