Removal of arsenic from aqueous liquids with selected alumina

Details Removal of arsenic from aqueous liquids with selected alumina Removal of arsenic from aqueous liquids with selected alumina

B - Operations, Transporting

01

D

B01D 15/02 (2006.01) B01D 21/26 (2006.01) B01D 61/14 (2006.01) B01D 61/16 (2006.01) C02F 1/28 (2006.01) C02F 1/44 (2006.01) C02F 1/52 (2006.01) C02F 1/58 (2006.01) C02F 9/00 (2006.01)

Patent

CA 2090989

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 micrometres, 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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