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High levels of arsenic in tubewell drinking-water in West Bengal, India, have been linked to arsenical dermatosis and skin cancer.

TitleRemoval of arsenic from groundwater by lime softening with powdered coal additive
Publication TypeJournal Article
Year of Publication1991
AuthorsDutta, A, Chaudhuri, M
Paginationp. 25-29: fig.
Date Published1991-02-01
Keywordsarsenic, coal, groundwater, india west bengal, laboratory testing, lime, softening
Abstract

High levels of arsenic in tubewell drinking-water in West Bengal, India, have been linked to arsenical dermatosis and skin cancer. A laboratory lime softening test was carried out to remove arsenic from groundwater samples collected from one of the affected areas. At a lime dose of 1250 mg/l and pH 11.8, maximum removal was 90% whereby arsenic concentration was reduced from 0.68-0.70 mg/l (arsenic (III) 0.59-0.60 mg/l) to 0.07 mg/l. With powdered bituminous coal additive (2 g/l), residual arsenic level below the WHO guideline level of 0.05 mg/l was achieved at a lime dose of 800 mg/l and pH 11.5. The magnesium-hydroxide precipitate played a more significant role in removing arsenic, particularly arsenic (III) than calcium carbonate.

NotesIncludes references
Custom 1259

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