Hydraulic and earth engineering – Soil remediation – In situ contaminant removal or stabilization
Patent
1991-10-04
1992-12-15
Taylor, Dennis L.
Hydraulic and earth engineering
Soil remediation
In situ contaminant removal or stabilization
55196, 166267, B01B 100
Patent
active
051711036
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention is directed to an arrangement for expelling highly volatile impurities from the ground water and the soil through which the latter flows. More particularly, it relates to an arrangement for expelling highly volatile impurities from the ground water and the soil through which the water flows by means of producing a vacuum in a well shaft which is driven into the area of the contaminated ground water and by means of directing a gas below the water level into the well shaft. Such an arrangement is already known from DE-PS No. 38 11 962. A vertical flow of ground water in the well shaft can be benefitted by means of this arrangement.
SUMMARY OF THE INVENTION
The object of the invention is to develop an arrangement of this kind in such a way that the vertical flow of ground water is more greatly benefitted and also controllable.
In keeping with these objects and with others which will become apparent hereinafter, one feature of the present invention resides, briefly stated, in an arrangement of the above mentioned type in which a nozzle body is provided for distributing the supplied gas along the well shaft cross-section via an upper defining wall of the nozzle body provided with through-openings, the nozzle body is arranged below the water level and defines an air chamber and also is held by means of a floating body, there is a pipe which is guided centrally relative to the nozzle body for guiding air and is securely connected with the nozzle body, the pipe has at least one air outlet opening in the area of the air chamber of the nozzle body, wherein in accordance with the present invention the pipe has a continuation pipe area for guiding water down and out via the nozzle body, a conveyor screw is arranged in this pipe area, and the continuation pipe is additionally provided with at least one water through-opening in the area between the nozzle body and the conveyor screw.
The driven conveyor screw located in the pipe arranged below the nozzle body in the ground water area can produce a liquid movement in the well shaft below the nozzle body and accordingly also below the cleaning area of the well shaft. This liquid flow conveys ground water either downward out of the cleaning area or upward from the bottom into the cleaning area -- depending on the rotating direction of the conveyor screw -- which then compulsorily triggers a counter-movement of ground water either back toward the top or back toward the bottom from the upper cleaning area and accelerates the exchange of cleaned ground water and contaminated ground water in the cleaning area. This arrangement has proven particularly advantageous in cases where impurities are concentrated in deeper layers of earth through which ground water flows and where precautions must be taken against higher layers of earth being additionally contaminated subsequently when driving a well shaft. In this case, an intermediate floor can be inserted in the well shaft above the more heavily contaminated layers of earth. The continuation part of the pipe provided with the conveyor screw is guided through this intermediate floor and allows contaminated ground water to be conveyed upward from below the intermediate floor in an advisably metered manner into the cleaning area of the well shaft located above the nozzle body.
In the arrangement, according to the invention, a continuous pipe can be used which serves to guide air up into the nozzle body and to guide water below the latter and comprises corresponding openings for the passage of air and for the passage of water. But the pipe can also be divided into its air-guiding portion, its water-guiding portion and continuation portion which is provided with the conveyor screw, wherein the divided portions can also have different diameters. In both cases, the conveyor screw can be advantageously arranged on a shaft which is guided concentrically in the pipe and connected with a motor placed on the upper end of the pipe.
In order that the favorable cleaning action achieved by means of the
REFERENCES:
patent: 4045336 (1977-08-01), Isteri
patent: 4632601 (1986-12-01), Kuwada
patent: 4850745 (1989-07-01), Hater et al.
patent: 4943305 (1990-07-01), Bernhardt
Striker Michael J.
Taylor Dennis L.
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