Patent · US Expired

Method of lowering the AOX content in water

US5068038A · kind A · utility

9Cited by

4References

13Claims

0Family size

Assignee

Degussa AG · DE

Inventors

Joachim Fischer · Rodgau, DE
Hubert Wolf · Hammersbach, DE

Key dates

Filing date	Sep 18, 1990
Grant date	Nov 26, 1991
Priority date	—
Expiry date	Sep 18, 2010

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S210/908
WIPO fieldEnvironmental technology
WIPO sectorChemistry

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.