Removal of arsenic from aqueous liquids with selected alumina
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United States of America Patent
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Sep 17, 1996
Grant Date -
N/A
app pub date -
Mar 3, 1994
filing date -
Mar 4, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The removal of arsenic, from aqueous liquids by adsorption on alumina, is facilitated by selecting the alumina adsorbent to have a particle size below about 200 micrometers, forming a slurry of the alumina and aqueous liquid and agitating the slurry. It has been found that alumina can be selected to have a particle size sufficiently small, or preferably a combination of both particle size sufficiently small and pore size and number sufficiently large, to achieve 50 ppb or less arsenic within about 2 hours treatment. The alumina with adsorbed arsenic is separated from the slurry by steps preferably comprising microfiltration. A precipitation pretreatment can be combined with the slurry treatment e.g. to handle more concentrated solutions.
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