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

1994-03-03

1996-09-17

Cintins, Ivars

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

210665, 210669, 210676, 210911, C02F 128

Patent

active

055565450

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.

REFERENCES:
patent: 4154675 (1979-05-01), Jowett et al.
patent: 4824576 (1989-04-01), Sood et al.
patent: 5338460 (1994-08-01), Yen

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