Biological filtration for removal of arsenic from drinking water |
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Authors: | Damodar Pokhrel Thiruvenkatachari Viraraghavan |
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Institution: | 1. Stantec Consulting Ltd., 1919 Rose St., Regina, SK, Canada S4P 3P1;2. Faculty of Engineering, University of Regina, Regina, SK, Canada S4S 0A2 |
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Abstract: | The main objective of the study was to find a suitable iron to arsenic ratio in water to reduce arsenic to 5 μg/L or lower through sand filtration. Experiments were conducted by varying the quantity of iron(II) while keeping the arsenic concentration at 100 μg/L. A mixture of iron (II) and arsenic at different ratios (10:1, 20:1, 30:1 and 40:1) was pumped to the sand filters in a down flow mode and effluent arsenic and iron were analyzed. It was found that a ratio of iron to arsenic of 40:1 was necessary to ensure an effluent arsenic concentration of 5 μg/L or lower. Iron in the filtrate was found to be below 0.1 mg/L at all times. |
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Keywords: | Slow sand filtration Arsenic removal Iron removal Drinking water |
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