Hydraulic and earth engineering – Soil remediation – In situ contaminant removal or stabilization
Reexamination Certificate
1999-11-22
2001-07-31
Bagnell, David (Department: 3673)
Hydraulic and earth engineering
Soil remediation
In situ contaminant removal or stabilization
C405S128500, C405S128700, C405S128750
Reexamination Certificate
active
06267534
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method for decontaminating soil on the spot from harmful substances. The invention also relates to a device to accomplish the method.
2. Description of the Related Art
There are today over the world existing large areas with contaminationed soil. Grounds being contaminated by harmful substances, such as heavy metals, but also PCB, chlorinated hydrocarbons, etc.
Thus, it has become a large field of research to develop technologies to remove poisons from the soil and a number of different methods has been proposed. A method has i.a. been proposed, by which the poisoned soil is removed and transported to decontamination facility, in which the soil is cleaned and thereafter restored to the ground area, where the removal took place. Such a method and the matching device become very complicated and thereby expensive to accomplish, the facility becoming i.a. automatically mobile to be usable in ground areas to be cleaned, or the soil has to be transported to a stationary facility far from the ground area. Also chemical methods have been developed to clean contaminated grounds, microemulsions then being pressed into the ground to wash the decontaminations away from it. Even this last mentioned method becomes complicated due to the aggregates pressing down the microemulsions and pumping these again out of the contaminated ground.
SUMMARY OF THE INVENTION
The main object of the present invention is to present a method for cleaning grounds, in which the drawbacks of already known methods might be avoided and which in a simple and inexpensive way provides a cleaning of contaminated grounds.
Another object of the invention is to provide a device, by means of which contaminated grounds can be cleaned in a simple and inexpensive way.
These and other objects and advantages of the invention are achieved by providing it with the characteristics specified in the claims to follow. In accordance with the invention at least one generally horizontal bore hole is created in the ground which communicates with an opening to the surface of the soil and a chord is inserted within the bore which chord includes reactive sorbents. The chord is retained in the ground for a period of time to allow the sorbents to provide for desired decontamination of the adjacent soil.
The invention will be described herein below more in detail in connection with the drawing, providing an embodiment of a device for accomplishing the method according to the invention.
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Chemical Abstracts, vol. 124, No. 16, c. 1997 American Chemical Society.
Bagnell David
Dowell & Dowell , P.C.
Globe Water AB
Lagman Frederick L.
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