Hydraulic and earth engineering – Soil remediation – In situ contaminant removal or stabilization
Patent
1991-06-07
1993-11-23
Corbin, David H.
Hydraulic and earth engineering
Soil remediation
In situ contaminant removal or stabilization
405263, B09B 300, E02D 300
Patent
active
052637956
ABSTRACT:
A method and system for in-situ remediation of contaminated groundwater and soil where the contaminants, such as toxic metals, are carried in a subsurface plume. The method comprises selection and injection into the soil of a fluid that will cause the contaminants to form stable, non-toxic compounds either directly by combining with the contaminants or indirectly by creating conditions in the soil or changing the conditions of the soil so that the formation of stable, non-toxic compounds between the contaminants and existing substances in the soil are more favorable. In the case of non-toxic metal contaminants, sulfides or sulfates are injected so that metal sulfides or sulfates are formed. Alternatively, an inert gas may be injected to stimulate microorganisms in the soil to produce sulfides which, in turn, react with the metal contaminants. Preferably, two wells are used, one to inject the fluid and one to extract the unused portion of the fluid. The two wells work in combination to create a flow of the fluid across the plume to achieve better, more rapid mixing of the fluid and the contaminants.
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Corey John C.
Kaback Dawn S.
Looney Brian B.
Constant Richard E.
Corbin David H.
Dixon Harold M.
Moser William R.
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