In situ reactive gate

Details In situ reactive gate In situ reactive gate

2000-06-09

2001-08-28

Bagnell, David (Department: 3672)

Hydraulic and earth engineering

Soil remediation

In situ contaminant removal or stabilization

C588S249000, C166S246000, C405S129700

Reexamination Certificate

active

06280118

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates generally to a method and apparatus for removing contaminants from groundwater and, more particularly, to an in situ reactive gate apparatus and method for removing various contaminants including volatile organic compounds (VOCs) from groundwater.
Contamination of the phreatic zone, also known as the zone of saturation, or groundwater with potentially hazardous materials is a common problem facing industry, the government, and the general public. The most common type of VOC pollutants are petroleum-based products. Frequently, as a result of spills, leakage from storage facilities, or surface discharges, contaminants percolate into groundwater, thereby posing a threat to drinking water supplies.
While groundwater is not as susceptible to pollution as surface water, once polluted, its restoration is difficult and long term. Typically, contaminated groundwater is removed from the phreatic zone, treated, and then returned to the phreatic zone. These “pump-and-treat”, or above-ground, methods are extremely expensive. There is a need for the development of an in situ apparatus and method for removing contaminants in a more efficient manner.
The present invention involves the use of a new reactive gate technology for removal of contaminants from the saturation zone. It avoids expensive “above ground” remediation methods and provides a more efficient method of remediation.
SUMMARY OF THE INVENTION
In a preferred embodiment of the present invention, a barrier wall is constructed below the ground surface and in the path of flow of a contaminated groundwater plume. A well is constructed in advance of the barrier wall and is connected to the barrier wall via a pipe. Various remediation media may be lowered into the well to perform remediation on the contaminated groundwater before it passes through the barrier wall.
The wall is preferably made of poured cement or bentonite. Within each gate one or more of a plurality of remediation technologies may be incorporated. The present invention incorporates unique gate designs and arrangements which provide for efficient remediation at reduced costs.
In addition to the novel features and advantages mentioned above, other objects and advantages of the present invention will be readily apparent from the following descriptions of the drawings and preferred embodiments.


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