Process for removing arsenic from aqueous mediums

Details Process for removing arsenic from aqueous mediums Process for removing arsenic from aqueous mediums

1979-02-09

1980-05-06

Wyse, Thomas G.

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

Responsive to fluid flow

C02C 504

Patent

active

042016673

ABSTRACT:
A process for removing arsenic from aqueous mediums by adding, in the presence of phosphorus, sufficient calcium hydroxide to adjust the aqueous medium to a pH of from about 7.0 to 11.5, whereby precipitates of both arsenic and phosphorus are formed and are subsequently separated from the aqueous medium. As a secondary treatment, calcium salts of arsenic and phosphorus in oxidation states lower than +5, and thus dissolved in the aqueous medium are oxidized, as by the addition of chlorine or hypochloride to such medium, and thereby converted to more insoluble forms which are separated from the aqueous medium as precipitates.

REFERENCES:
patent: 3766036 (1973-10-01), McKaveney
patent: 4118243 (1978-10-01), Sandesara
patent: 4142912 (1979-03-01), Young

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