Method of treatment for rendering halogenated organic compounds

Details Method of treatment for rendering halogenated organic compounds Method of treatment for rendering halogenated organic compounds

1998-03-26

2000-05-30

Simmons, David A.

Liquid purification or separation

Processes

Including geographic feature

210757, 210908, 405128, C02F 170

Patent

active

060687770

ABSTRACT:
The reduction of halogenated organic compounds with an iron powder can be markedly accelerated to realize an enhanced reaction rate by the combined use of a reducing substance that is water-soluble and which exhibits weak acidity in water. The reducing substance such as sodium hydrogensulfite may be injected into the ground simultaneously with the iron powder or it may be preliminarily added to the contamination source via a different route than the iron powder which is subsequently injected. An amount of water containing 100 ppm of trichloroethylene (TCE) as a halogenated organic compound was provide; 500 ppm of sodium hydrogensulfite was added and 6,000 ppm of an iron powder was subsequently added; the time profile of the TCE concentration in the mixture was measured; as shown in FIG. 1, the TCE concentration decreased rapidly with the lapse of time and more than 90% of TCE was reduced in 8 days.

REFERENCES:
patent: 5258124 (1993-11-01), Bolton et al.
patent: 5362402 (1994-11-01), Haitko et al.
patent: 5447639 (1995-09-01), Sivavec
patent: 5575927 (1996-11-01), Sivavec et al.
patent: 5750036 (1998-05-01), Sivavec
patent: 5833388 (1998-11-01), Edwards et al.
patent: 5868941 (1999-02-01), Gillham et al.

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