Hydraulic and earth engineering – Soil remediation – In situ contaminant removal or stabilization
Patent
1988-03-23
1991-05-07
Corbin, David H.
Hydraulic and earth engineering
Soil remediation
In situ contaminant removal or stabilization
405266, 405269, E02D 312
Patent
active
050131850
ABSTRACT:
The present invention is directed to a modified multishaft auger apparatus for in situ fixation of soil contaminated with toxic waste. Soil fixation is achieved by augering a plurality of boreholes downwardly into the contaminated soil with a modified multi-shaft auger machine. A chemical hardener is injected into the contaminated soil while the boreholes are being augered. As the shafts rotate, a plurality of soil mixing paddles extending outwardly from each shaft blend the contaminated soil with the chemical hardener in situ. The soil mixing paddles are configured so as to minimize the vertical movement of the contaminated soil out of the boreholes in order to maximize in situ containment of the contaminated soil. Upon hardening, the soil is immobilized such that hazardous chemicals, toxic compounds and other soil constituents are trapped in order to prevent migration from the fixated area.
A multi-shaft auger apparatus capable of augering boreholes of different diameter is disclosed. Boreholes of different diameter are arranged in a pattern which efficiently eliminates interstitial spaces between adjacent boreholes. As a result, a larger area of contaminated soil may be fixated according to the methods of the present invention more efficiently than by use of boreholes having substantially equal diameter.
To achieve maximum horizontal blending of the contaminated soil with the chemical hardener, various soil mixing paddle configurations are disclosed. The present invention contemplates the use of different soil mixing paddle configurations depending upon the existing soil conditions.
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