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首页> 外文期刊>Environmental Science & Technology: ES&T >Performance of a Household-Level Arsenic Removal System during 4-Month Deployments in Bangladesh
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Performance of a Household-Level Arsenic Removal System during 4-Month Deployments in Bangladesh

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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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