Method of lowering the AOX content in water

Details Method of lowering the AOX content in water Method of lowering the AOX content in water

1990-09-18

1991-11-26

Silverman, Stanley S.

Liquid purification or separation

Processes

Ion exchange or selective sorption

210691, 210717, 210746, 210724, 210726, 210908, 210709, C02F 128

Patent

active

050680382

ABSTRACT:
The content of halo-organic pollutants in water is lowered to residual AOX values below 1 mg/l, preferably below 0.1 mg/l by adjusting the Fe.sup.2+ comtent of the water to 20 to 1000 mg/l, adding a precipitated or pyrogenic silicic acid, converting 20 to 1000 mg of the Fe.sup.2+ into Fe.sup.3+ by adding in an oxidation agent, preferably hydrogen peroxide, and separating the iron (III) hydroxy complexes formed and the silicic acid, which contain the halo-organic pollutants in an adsorbed state, at pH 5-10. The method can be controlled in a simple manner as regards the addition of Fe.sup.2+ and oxidation agent via the Fe.sup.2+ /Fe.sup.3+ redox potential.

REFERENCES:
patent: 4131543 (1978-12-01), Carosello
patent: 4416786 (1983-11-01), Knorre et al.
patent: 4595509 (1986-06-01), Fox et al.
patent: 4758346 (1988-07-01), Johnson

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