Performance of a household-level arsenic removal system during 4-month deployments in Bangladesh

Publication Type  Journal Article
Year of Publication  2004
Authors  Cheng, Z. Q.; Van Geen, A.; Jing, C. Y.; Meng, X. G.; Seddique, A.; Ahmed, K. M.
Journal Title  Environmental Science & Technology
Volume  38
Issue  12
Pages  3442-3448
Journal Date  Jun 15
ISBN Number  0013-936X
Accession Number  ISI:000222051400042
Key Words  environmental risk-factors; parkinsons-disease; ferric-chloride; well water; iron; coprecipitation; adsorption; manganese; exposure

A simple arsenic removal system was used in Bangladesh by six households for 4 months to treat well water containing 190-750 mug/L As as well as 0.4-20 mg/L Fe and 0.2-1.9 mg/L P. The system removes As from a 16-L batch of water in a bucket by filtration through a sand bed following the addition of about 1.5 g of ferric sulfate and 0.5 g of calcium hypochlorite. Arsenic concentrations in all but 1 of 72 samples of treated water were below the Bangladesh drinking water standard of 50 mug/L for As. Approximately half of the samples also met the World Health Organization (WHO) guideline of 10 mug/L. At the two wells that did not meet the WHO guideline, observations were confirmed by additional experiments in one case ([P] = 1.9 mg/L) but not in the other, suggesting that the latter household was probably not following the instructions. Observed residual As levels are consistent with predictions from a surface complexation model only if the site density is increased to 2 mol/mol of Fe. With the exception of Mn, the average concentrations of other inorganic constituents of health concern (Cr, Ni, Cu, Se, Mo, Cd, Sb, Ba, Hg, Pb, and U) in treated water were below their respective WHO guideline for drinking water.


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URL  <Go to ISI>://000222051400042
DOI  Doi 10.1021/Es0352855