Method of recovering subsurface contaminants

Hydraulic and earth engineering – Soil remediation – In situ contaminant removal or stabilization

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405258, B09B 100, B09B 300

Patent

active

053421477

ABSTRACT:
A method of recovering contaminants entrained in subsurface soils which includes establishing a plurality of vacuum withdrawal wells and a plurality of air injection wells adjacent to a contaminated zone of earth. The method includes operating the wells in this fashion for a predetermined time, then reversing the air flow through one or more of the wells to effect contaminant removal in previously untreated nodes in the well field.

REFERENCES:
patent: 5067852 (1991-11-01), Plunkett
patent: 5076727 (1991-12-01), Johnson et al.
patent: 5169263 (1992-12-01), Johnson et al.
patent: 5193934 (1993-03-01), Johnson et al.
patent: 5228804 (1993-07-01), Balch
patent: 5271693 (1993-12-01), Johnson et al.

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