Nontoxic chemical process for in situ permeability enhancement a

Details Nontoxic chemical process for in situ permeability enhancement a Nontoxic chemical process for in situ permeability enhancement a

1995-06-27

1997-01-14

Suchfield, George A.

Hydraulic and earth engineering

Soil remediation

In situ contaminant removal or stabilization

166266, 166271, 405263, 405264, 405268, B09C 108, E02D 310, E21B 4340

Patent

active

055932487

ABSTRACT:
The remediation of heterogeneous subsurfaces is extremely time consuming and expensive with current and developing technologies. Although such technologies can adequately remove contaminants in the high hydraulic conductivity, coarse-grained sediments, they cannot access the contaminated low hydraulic conductivity fine-grained sediments. The slow bleed of contaminants from the fine-grained sediments is the primary reason why subsurface remediation is so time-consuming and expensive. This invention addresses the problem of remediating contaminated fine-grained sediments. It is intended that, in the future, a heterogeneous site be treated by a hybrid process that first remediates the high hydraulic conductivity, coarse-grained sediments, to be followed by the process, described in this invention, to treat the contaminated low hydraulic conductivity fine-grained sediments. The invention uses cationic flocculents and organic solvents to collapse the swelling negative double layer surrounding water saturated clay particles, causing a flocculated, cracked clay structure. The modification of the clay fabric in fine-grained sediments dramatically increases the hydraulic conductivity of previously very tight clays many orders of magnitude.

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patent: 5449251 (1995-09-01), Daily et al.
patent: 5476992 (1995-12-01), Ho et al.

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