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Adsorption experiments were performed
using activated
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alumina
and ferric hydroxide for the removal of arsenic from
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potable
water. Arsenic laden water was passed through a column
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at a
rate of 2 liters/hr, allowing ample contact time in the column.
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Initial
concentrations of approximately 500 ppb were successfully
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reduced
to approximately 11 ppb and 3 ppb for alumina and ferric
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hydroxide,
respectively. Arsenic removal was also obtained in a
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batch
process by co-precipitation with ferric hydroxide. Ferric
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hydroxide was
prepared by mixing ferric chloride and a 15%
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stoichiometric
excess of sodium hydroxide.
Co-precipitation of
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ferric
hydroxide and arsenic occurred in less than one minute,
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reducing
the concentrations from 50 ppm to as low as 150 ppb.
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