JP2011122326A - Oil content recovery device for oil-contaminated groundwater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil content recovery device capable of recovering the oil content near the surface of a groundwater even if the groundwater level fluctuates. <P>SOLUTION: This oil content recovery device includes a pumping well 2 which is excavated in an earth G and to which a strainer 11 is provided, a strainer closing member 12 capable of closing the hole part (opening) 11a of the strainer 11, a pump 3 for pumping up the groundwater W and the oil content O flowing into the pumping well 2 through the hole part 11a, an oil-water separator 4 for separating the groundwater W and the oil content O pumped up by the pump 3, and a groundwater level observation well 5 which is installed near the pumping well 2 and observes the groundwater level in the earth G. The strainer closing member 12 can adjust the height of the hole part 11a to be closed. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an apparatus for recovering oil contained in oil-contaminated groundwater.

Conventionally, in order to collect the oil mixed in the groundwater from the soil contaminated with the oil and the oil layer formed by floating the oil on the groundwater surface, the oil is recovered by pumping the groundwater and the oil.
In general, a pumping well is constructed in the target soil, the groundwater flowing into the pumping well is pumped up by a submersible pump to lower the groundwater level, and the oil collected on the lowered groundwater surface is recovered by an oil skimmer. is doing. The oil skimmer is a mechanism in which the oil intake port is installed in accordance with the groundwater surface, and only the oil component is passed through a special filter provided at the oil intake port, and the stored oil component is recovered.
In addition, in order to remove the oil content near the groundwater surface, an air-driven pump without seizure is installed near the groundwater surface, and the oil content and groundwater are pumped up at the same time to separate the groundwater and oil content and collect the oil content. It has been broken.

  According to Patent Document 1, a transport fluid such as water is supplied to soil contaminated with contaminants such as oil to wash away the contaminants from the soil, and is installed below and below the groundwater level. An in-situ purification method for pollutants is disclosed in which groundwater containing pollutants flowing in along with the transport fluid is pumped to remove the pollutants.

JP 2004-74158 A

However, conventional groundwater oil recovery devices and methods have the following problems.
The oil skimmer can selectively collect the oil by a special filter, but there is a problem that the oil collection efficiency decreases when the oil content is low on the groundwater surface.
In addition, the air-driven pump is expensive, cannot easily move in the vertical direction, and cannot cope with fluctuations in the groundwater level.
Moreover, in the in-situ purification method of pollutants by patent document 1, in order to accommodate pollutants other than oil, the pump is located below the groundwater level and near the bottom of the hollow pipe into which groundwater flows. Therefore, the oil content near the fluctuating groundwater surface could not be recovered efficiently.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide an oil content recovery apparatus that can recover oil content near the groundwater surface even when the groundwater level fluctuates.

In order to achieve the above object, an oil content recovery apparatus for oil-contaminated groundwater according to the present invention is an apparatus for recovering oil content mixed in groundwater from soil, which is excavated in the soil and provided with a strainer A strainer closing member capable of closing the opening of the strainer, a pump for pumping up groundwater and oil flowing into the pumping well from the opening, and an oil / water separator for separating the groundwater and oil pumped up by the pump And a groundwater level observation well provided in the vicinity of the pumping well for observing the groundwater level of the soil, and the strainer closing member is capable of adjusting the height of the opening to be closed. To do.
In the oil-contained groundwater oil recovery device according to the present invention, the strainer closing member closes the opening located below the groundwater level.

In the present invention, groundwater and oil that have flowed into the pumping well from the opening of the strainer are pumped up, and the oil is recovered by separating the groundwater from the oil. And the strainer obstruction | occlusion member can flow the underground water and oil which exist above arbitrary height in soil into a pumping well by being able to adjust the height of the opening part to obstruct | occlude.
In addition, by closing the strainer opening located below the groundwater level measured by the groundwater level observation well, groundwater and oil content near the groundwater surface flows into the pumping well, so there is a large amount near the groundwater surface. The oil component to be recovered can be recovered.

Moreover, in the oil content recovery apparatus for oil-contaminated groundwater according to the present invention, the strainer closing member is a cylindrical member provided inside the strainer, and is slidable in the vertical direction along the inner surface of the strainer. It is characterized by that.
In the present invention, the strainer closing member is a cylindrical member provided inside the strainer, and is slidable in the vertical direction along the inner surface of the strainer, so that the cylindrical body is slid to an arbitrary height. The opening that overlaps the cylinder can be closed.

Moreover, in the oil content recovery apparatus for oil-contaminated groundwater according to the present invention, the strainer closing member is a cylindrical member provided inside the strainer, and the cylindrical body is extendable in the vertical direction. And
In the present invention, the strainer closing member is a cylindrical member provided inside the strainer, and can be expanded and contracted in the vertical direction along the inner surface of the strainer, thereby expanding and contracting the cylindrical body to an arbitrary height. The opening that overlaps the cylinder can be closed.

  ADVANTAGE OF THE INVENTION According to this invention, the height of the opening part of the strainer which a strainer obstruction | occlusion member obstruct | occludes can be adjusted, Therefore The groundwater and oil which exist in arbitrary heights in soil can be made to flow in into a pumping well. Therefore, even when the groundwater level fluctuates, the opening near the groundwater surface is opened in accordance with this fluctuation, and the opening below this is closed with the strainer blocking member, so that much oil present near the groundwater surface is removed. It can be recovered.

It is a figure which shows an example of the oil content collection | recovery apparatus of the oil pollution groundwater by 1st embodiment of this invention. It is a figure which shows an example of the oil content collection apparatus of the oil pollution groundwater by 2nd embodiment of this invention.

Hereinafter, an oil content recovery apparatus for oil-contaminated groundwater according to a first embodiment of the present invention will be described with reference to FIG.
As shown in FIG. 1, the oil content recovery apparatus 1 for oil-contaminated groundwater according to the first embodiment is an apparatus for recovering oil content O mixed in the groundwater W from the soil G, and is excavated in the soil G. In the vicinity of the pumping well 2, the pump 3 for pumping the groundwater W and the oil content O in the pumping well 2, the oil / water separator 4 for separating the groundwater W and the oil content O pumped by the pump 3, It is generally composed of a groundwater level observation well 5 which is provided and observes the groundwater level of the soil G.

The pumping well 2 is formed in a cylindrical shape, and is provided with a strainer 11 having a large number of small-diameter holes (openings) 11a on the outer peripheral surface at an intermediate portion in the height direction. The groundwater W and the oil component O pass through the strainer 11, are filtered, and flow into the pumping well 2.
A strainer closing member 12 is provided inside the strainer 11. The strainer closing member 12 is a cylindrical member that is slidable in the vertical direction in contact with the inner surface of the strainer 11. When the strainer blocking member 11 overlaps the hole 11a, the strainer blocking member 11 closes the hole 11a and prevents the groundwater W and the oil component O from flowing into the pumped well 2 from the hole 11a.
The strainer closing member 12 is installed so as to be suspended from above, and the movement in the vertical direction is controlled by a control unit (not shown).

The pump 3 is a known pump that pumps up the ground water W and the oil content O in the pumping well 2, and moves the ground water W and the oil content O in the pumping well 2 to the oil-water separator 4.
The groundwater level observation well 5 is excavated in the vicinity of the pumping well 2. A strainer is installed in the groundwater level observation well 5, and groundwater flows into the inside from the strainer. The groundwater level observation well 5 is provided with a water level monitor 13 for measuring the water level of the groundwater W.

Next, the oil content recovery method of the oil-contaminated groundwater by the oil content recovery device 1 of the above-described first embodiment will be described.
First, the groundwater level in the vicinity of the pumping well 2 is measured by the water level monitor 13 of the groundwater level observation well 5. Then, the strainer closing member 12 is slid so that the upper end portion of the strainer closing member 12 is slightly below the groundwater surface W1. By moving the strainer closing member 12 to this position, the hole 11a of the strainer 11 below the groundwater surface W1 is closed.

Then, the groundwater W and the oil O near the groundwater surface flow into the pumped well 2 from the hole 11a of the strainer 11, and the groundwater W and the oil O below the groundwater surface W1 are prevented from flowing into the pumped well 2. Is done.
At this time, since a large amount of oil O is mixed in the ground water W in the vicinity of the ground water surface W1, a larger amount of oil O flows into the pumping well 2 than when the ground water and the oil O are flowed into the pumping well 2 from the hole 11a of the entire strainer 11. Can be made. Further, since the oil layer O1 is formed by the oil component O on the groundwater surface W1, the oil component O of the oil layer O1 also flows into the pumping well 2.

  The groundwater W and the oil content O are allowed to flow into the pumping well 2, and the groundwater W and the oil content O in the pumping well 2 are pumped up to the oil / water separator 4 by the pump 3, and the groundwater W and the oil content O are separated by the oil / water separator 4. The oil O is recovered.

As the strainer closing member 12 is slid downward to reduce the number of holes 11a of the strainer 11 that the strainer closing member 12 closes, more ground water W and oil O flow into the pumping well 2. Moreover, all the hole parts 11a of the strainer 11 can also be obstruct | occluded by the strainer obstruction | occlusion member 11, and the inflow of the groundwater W and the oil component O to the pumping well 2 can be stopped.
In this way, by sliding the strainer closing member 12 up and down, the groundwater W and the oil content O are intermittently flowed into the pumping well 2, or the inflow amounts of the groundwater W and the oil content O into the pumping well 2 are adjusted. can do.
Then, the groundwater level is changed by intermittently flowing the groundwater W and the oil content O into the pumping well 2, or changing the inflow amount of the groundwater W and the oil content O into the pumping well 2 and the pumping amount by the pump 3. be able to.

Next, the effect of the oil content recovery apparatus 1 described above will be described with reference to the drawings.
According to the oil content recovery apparatus 1 for oil-contaminated groundwater according to the present embodiment, the strainer closing member 12 can slide to close the hole 11a of the strainer 11 to a predetermined height, so even when the groundwater level fluctuates. The hole 11a of the strainer 11 below the groundwater surface can be closed in accordance with the change in the groundwater level, and the groundwater W and the oil component O in the vicinity of the groundwater surface W1 can be recovered. And since there is a lot of oil component O in the vicinity of the groundwater surface W1, there is an effect that the oil component O can be efficiently recovered.
Further, by collecting the groundwater W and the oil content O intermittently into the pumping well 2 or changing the amount of water pumped by the pump 3 to change the groundwater level, the effect of collecting the oil content O can be enhanced.

Next, the second embodiment will be described with reference to FIG. 2, but the same or similar members and parts as those of the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted. A configuration different from that of the embodiment will be described.
As shown in FIG. 2, in the oil content recovery device 21 of the oil-contaminated groundwater according to the second embodiment, the strainer closing member 22 is formed in a bellows type cylindrical shape. The strainer closing member 22 is installed on the inner side of the strainer 11 and can be expanded and contracted in the vertical direction while being in contact with the inner surface of the strainer 11. The strainer closing member 22 expands and contracts and overlaps the hole 11a to close the hole 11a.
And when the strainer obstruction | occlusion member 22 expands and contracts and the length of an up-down direction changes, the hole 11a height of the strainer 11 to obstruct | occlude can be set.

  The oil content recovery device 21 according to the second embodiment has the same effect as the oil content recovery device according to the first embodiment.

As mentioned above, although embodiment of the oil content collection | recovery apparatus of the oil-contaminated groundwater by this invention was described, this invention is not limited to said embodiment, It can change suitably in the range which does not deviate from the meaning.
For example, the strainer 11 includes a large number of holes 11a, but may be configured to include a large number of slits extending in the vertical direction instead of the holes 11a, or may be configured to include a mesh-like screen. Good. In any case, the height of the opening through which the groundwater W and the oil component O flow into the pumped well 2 is adjusted by the strainer closing member 12.
In the first embodiment described above, the strainer closing member 12 is suspended from above, but the lower side of the strainer closing member 12 may be held in the pumping well 2 so as to be slidable in the vertical direction.

DESCRIPTION OF SYMBOLS 1 Oil collecting device of oil-contaminated groundwater 2 Pumping well 3 Pump 4 Oil-water separator 5 Groundwater level observation well 11 Strainer 11a Hole 12 Strainer blockage mechanism G Soil W Groundwater O Oil content O1 Oil layer

Claims (4)

A device that collects oil mixed in the groundwater from soil,
A pumping well drilled in the soil and provided with a strainer;
A strainer closing member capable of closing the opening of the strainer;
A pump for pumping up groundwater and oil flowing into the pumping well from the opening;
An oil-water separator that separates groundwater and oil components pumped by the pump;
A groundwater level observation well provided near the pumping well for observing the groundwater level of the soil;
The strainer closing member is capable of adjusting the height of the opening to be closed, and is an oil content recovery device for oil-contaminated groundwater.   The oil content recovery device according to claim 1, wherein the strainer closing member closes the opening located below the groundwater level.   3. The oil contamination according to claim 1, wherein the strainer closing member is a cylindrical member provided inside the strainer, and is slidable in the vertical direction along the inner surface of the strainer. Groundwater oil recovery device.   3. The oil contamination according to claim 1, wherein the strainer closing member is a cylindrical member provided inside the strainer, and is extendable in the vertical direction along the inner surface of the strainer. Groundwater oil recovery device.

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