JP2000210656A - Method and device for treating groundwater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and device for purifying groundwater excellent in terms of easiness of installation and reduced cost and further excellent in operability. SOLUTION: A well 3 is dug from the surface Gs of the ground G toward an aquifer 2, a water stop body 5 dividing the inside of the well 3 vertically and watertightly is provided, a pipe 6 vertically piercing the stop body 5 is furnished, a screen 12 permeable to the water inside and outside the well 3 is provided above the surface Ws of the aquifer 2, the groundwater W in the aquifer 2 is pumped up by a pump 8 through the pipe 6, the groundwater W is jetted into the well 3 from the upper end 6b of the pipe 6, the jetted groundwater W is supplied into the ground G through the screen 12, and the air in the well 3 above the stop body 5 is sucked and purified by a purifier 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method and an apparatus for purifying groundwater for removing contaminants of contaminated groundwater in an aquifer in the ground.

[0002]

2. Description of the Related Art Groundwater pollution by volatile organic chlorine compounds and the like has become a problem in various places. For purification of contaminated groundwater,
A vacuum extraction method of sucking contaminant gas in the aeration layer, a groundwater pumping method of pumping contaminated groundwater in the aquifer and treating the water are used.

[0003]

However, in these groundwater purifying methods, it is necessary to provide a large-sized water treatment apparatus on the ground, and there is a problem in terms of installability and cost. In addition, these groundwater purification measures are often performed over a long period of time to meet environmental standards.
Accordingly, there has been a demand for a purifying apparatus that does not cause any inconvenience even if the apparatus is operated for a long time.

In view of the above circumstances, it is an object of the present invention to provide a method and an apparatus for purifying groundwater which are excellent in terms of installability and cost, are excellent in operability, and can be used for a long period of time. .

[0005]

Means for Solving the Problems To solve the above problems, the present invention employs the following means. That is,
The groundwater purification method according to claim 1 is a groundwater purification method for removing pollutants of contaminated groundwater in an aquifer in the ground, wherein a well is formed from a ground surface of the ground toward the aquifer. The well is provided with a water stopping body that divides the inside of the well up and down in a water-tight manner, and a pipe that penetrates the water stopping body up and down is provided in the well. A screen is provided below the well to allow movement of water inside and outside the well, pumping groundwater in the aquifer through the pipe, and transferring the groundwater from the upper end of the pipe into the well. And supplying the spouted groundwater into the ground through the screen, and suctioning and purifying the air above the water stopping body inside the well.

A groundwater purifying apparatus according to a second aspect of the present invention is a groundwater purifying apparatus for removing pollutants of contaminated groundwater in an aquifer in the ground, wherein the groundwater is directed from the ground surface of the ground toward the aquifer. A water stop, which vertically partitions the inside of the well in a watertight manner, a pipe penetrating the water stop vertically, and the groundwater below the water stop through the pipe. A pump for pumping water above the water body is provided, and a screen that allows movement of water inside and outside the well is provided at a position above the water stopping body and below an upper end of the pipe on the wall of the well. And a purifying device for suctioning and purifying air above the water stopping body of the well is provided.

[0007] In these groundwater purifying methods and apparatuses, aeration treatment of contaminated water can be performed in a well, and only a device for suctioning air after aeration of groundwater needs to be provided on the ground. Becomes

The groundwater purifying apparatus according to claim 3 is
3. The groundwater purifying apparatus according to claim 2, wherein a water flow blocking member is provided above an upper end of the pipe so as to collide with a water flow spouting from the upper end of the pipe.

[0009] With this configuration, in this groundwater purifying apparatus, the groundwater spouted from the upper end of the pipe does not flow out of the well, and the groundwater is efficiently pumped near the upper end of the well. Aeration can be performed.

[0010] A groundwater purification apparatus according to claim 4 is the groundwater purification apparatus according to any one of claims 1 to 3,
A filter mat is provided inside the well to allow passage of the groundwater and restrict passage of fine particles contained in the groundwater.

Due to such a configuration, in this groundwater purification apparatus, fine soil particles contained in the groundwater and iron in the groundwater are oxidized by blowing air into the groundwater. When the colloid fine particles are present, the fine particles due to the fine soil particles and the colloid can be removed.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an embodiment of the present invention, in which reference numeral 1 indicates a groundwater purification device. The groundwater purifying apparatus 1 is roughly constituted by a well 3 excavated from a surface Gs of the ground G toward an aquifer 2 in the ground, and a purifying apparatus 4 connected to an upper end 3 a of the well 3.

The well 3 is provided with a water stop 5 for vertically partitioning the inside of the well 3 up and down, and a pipe 6 penetrating the water stop 5 up and down. At a lower end 6 a of the pipe 6, there are provided a water inlet 7 for sucking the groundwater W, and a water pump 8 for pumping the groundwater W sucked from the water inlet 7 to above the water stop 5 through the pipe 6. ing.

A valve 9 is provided at a position above the water stop 5 in the pipe 6. Further, the upper end 6b of the pipe 6 is arranged so as to reach near the upper end 3a of the well 3, and further above the upper end 6b of the pipe 6, a baffle plate (water flow prevention) for colliding the water jetting from the upper end 6b Member 10 is provided.

The casing (wall) 11 of the well 3 has screens 12 and 13 for allowing water inside and outside the well 3 to move both above and below the water blocking body 5.
Is provided. Among them, the screen 12 located above the water blocking body 5 is provided below the upper end 6b of the pipe 6 and above the groundwater surface Ws.

On the other hand, the purifying device 4 includes an air collecting pipe 14 having one end 14 a connected to the upper end 3 a of the well 3, a vacuum pump 15 provided in the middle of the air collecting pipe 14, An activated carbon adsorption tower 16 connected to the end 14b is provided.

Next, groundwater W using the groundwater purifier 1
A method for purifying the water will be described. First, the above-described groundwater purification apparatus 1 is installed on the ground G to be purified. In the groundwater purifying apparatus 1, by starting the operation of the water pump 8, the groundwater W located below the waterstop 5 is pumped above the waterstop 5 through the pipe 6 and is ejected from the upper end 6 b. .

Groundwater W spouting from upper end 6b of pipe 6
Collides with the baffle plate 10 and comes into contact with the air, flows down into the well 3, and stays inside the well 3. However, since the screen 12 is provided above the groundwater surface Ws, the inside of the well 3 The groundwater W that has accumulated in the ground G is again supplied to the ground G via the screen 12.

At this time, since the groundwater W is brought into contact with air inside the well 3, if the groundwater W contains a pollutant such as a volatile organic chlorine compound, the contaminant is removed. Volatilizes in the well 3.

At this time, by simultaneously operating the vacuum pump 15, the air containing the contaminants in the well 3 is sent to the activated carbon adsorption tower 16 via the air collecting pipe 14. Then, after the treatment is performed in the activated carbon adsorption tower 16, it is released into the atmosphere.

In the above-described groundwater purifying apparatus 1 and the groundwater purifying method, the aeration of the contaminated groundwater W can be performed in the well 3, and only the purifying apparatus 4 needs to be provided on the ground. In contrast, there is no need to provide a large water treatment device on the ground. Therefore, the installation property and installation cost of the apparatus can be reduced as compared with the related art. In addition, since the groundwater W in the aquifer 2 containing the pollutants can be efficiently circulated in the well 3, the operability is good, and even when purification measures are required for a long period of time, it is excellent. Applicable.

Further, in the above-mentioned groundwater purifying apparatus 1, the upper end 6b of the pipe 6 is attached to the baffle plate 10 (water flow blocking member).
The groundwater W gushing out of the well 3 is made to collide, so that the groundwater W can be efficiently aerated in the vicinity of the upper end 3a of the well 3 without the groundwater W flowing out of the well 3, and the groundwater purification efficiency can be improved. Can be done
In this case, the groundwater W can be aerated near the upper end 3a of the well 3, so that the vacuum pump 15
It is not necessary to make the performance such as an excessive one, and the installation cost can be reduced.

While one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and other configurations can be adopted without departing from the gist of the present invention. It is.

For example, a configuration such as a groundwater purification apparatus 1 'shown in FIG. 2 may be adopted. This groundwater purifying apparatus 1 ″ has a configuration including two pipes, an air supply pipe (pipe) 20 and a water pumping pipe 21. The base end 20a of the air supply pipe 20 is located outside the well 3. Connected to the arranged compressor 22 and its tip 20b
Is located at the center 21 of the pumping pipe 21 located in the groundwater W.
a. Further, the pumping pipe 21 is arranged such that its upper end 21b protrudes above the groundwater surface Ws. Further, the air supply pipe 20 and the pumping pipe 21 are provided so as to penetrate the water stop 5.

A screen 24 is provided at the upper end 21b of the pumping pipe 21. A baffle plate cassette 25 is provided around the screen 24. The baffle cassette 25 includes a casing 26 and a filter mat 27 disposed inside the casing 26.

The upper end of the casing 26 is closed,
The filter mat 27 is made of a material capable of restricting passage of fine particles contained in the groundwater W. Further, the casing 26 and the filter mat 27
Are formed integrally with the upper end 21b of the pumping pipe 21.
It is detachably attached to.

An air bubble maintaining device 29 is interposed above the connection point of the pumping pipe 21 with the air supply pipe 22. The air bubble maintaining device 29 includes the filter mat 2
7 is composed of a coarser mesh than that of FIG.

In order to purify the groundwater W using the groundwater purifier 1 ′ having such a configuration, first, the operation of the water pump 8 is started, so that the water pump 5 is moved downward through the water pump pipe 21 to the lower side of the water stopping body 5. Is pumped above the water stop 5. At this time, the compressor 2
By starting the operation 2, air is sent into the pumping pipe 21. Thereby, the groundwater W in the pumping pipe 21 is brought into contact with the air.

The groundwater W pumped out in this way is blown out from the upper end 21b of the pumping pipe 21 together with the air, collides with the casing 26 of the baffle cassette 25, and flows downward. At this time, the filter mat 27 removes fine soil particles contained in the groundwater W and iron colloid formed by oxidizing iron in the groundwater W. Then, the groundwater W flows down from the open lower end of the casing 26 of the baffle cassette 25 into the well 3, thereby raising the water level inside the well 3. Therefore, a water level difference occurs in the well 3 and the aquifer 2, and the ground water W is recharged into the ground G through the screen 12 due to the water level difference.

In this case, the groundwater W is brought into contact with both the air supplied by the compressor 22 and the air in the well 3, so that contaminants such as volatile organic chlorine compounds are contained in the groundwater W. If present, this contaminant will dissolve into the air.

Therefore, at this time, if the vacuum pump 15 is operated at the same time, the air containing the contaminants in the well 3 is sent to the activated carbon adsorption tower 16 via the collection pipe 14 and the activated carbon is adsorbed. After being processed in the tower 16, it will be released to the atmosphere.

As described above, the groundwater purifying apparatus 1 'can obtain the same groundwater purifying function as the groundwater purifying apparatus 1 of the above-described embodiment.
In the groundwater purifying apparatus 1 ', the following effects can be obtained.

First, at the time of pumping, the compressor 2
Since the air is supplied into the pumping pipe 21 by 2, the groundwater W can contact the air not only at the upper end 21 b of the pumping pipe 21 but also inside the pumping pipe 21, thereby more reliably. , It is possible to volatilize volatile pollutants in groundwater W,
Groundwater purification capacity can be improved.

In this case, if the air bubbles supplied by the compressor 22 become too large, the ability to remove volatile pollutants may be reduced. Since the air bubble maintaining device 29 is interposed midway, the air bubbles that have risen up the water pumping pipe 21 are maintained at an appropriate size, thereby ensuring the ability to remove volatile pollutants.

In the groundwater purifying apparatus 1 ′, since the filter mat 27 is provided inside the well 3, iron colloids in the groundwater W are oxidized and fine particles of the soil particles are formed. The screen 12 can be prevented from being clogged, and the recharging ability of the screen 12 can be secured for a long period of time. Therefore, it is suitable when a long-term purification measure is required.

Further, in this case, the filter mat 27
Is integrated with the casing 26, and the baffle plate cassette 25
Since the filter mat 27 is detachably attached to the pumping pipe 23, when the clogging of the filter mat 27 progresses, the filter mat 27 can be easily replaced and maintenance work can be facilitated.

[0037]

As described above, in the groundwater purifying apparatus and the groundwater purifying method of the present invention, the aeration treatment of the contaminated groundwater can be performed in the well. There is no need to provide equipment. Therefore, the installation property and installation cost of the apparatus can be reduced as compared with the related art. In addition, since the groundwater in the aquifer containing pollutants can be efficiently circulated in the well, operability is good, and it can be applied well even when purification measures are required for a long period of time. It is.

[0038] In this case, if the groundwater spouted from the upper end of the pipe is caused to collide with the water flow blocking member by the configuration as in claim 3, the groundwater does not flow out of the well. Efficient aeration of groundwater can be performed near the upper end of the well, and groundwater purification can be performed efficiently. Furthermore, in this case, since the aeration of the groundwater can be performed in the vicinity of the upper end of the well, it is not necessary to make the performance of the device for sucking the air containing the pollutant excessive, thereby reducing the installation cost. Reduction can be achieved.

According to the groundwater purifying apparatus of the fourth aspect, by providing a filter mat inside the well, the screen is clogged with iron colloid and fine particles formed by oxidizing iron in groundwater. , And the recharge capability of the screen can be ensured for a long period of time, which is suitable when a long-term purification measure is required.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a groundwater purification apparatus schematically showing an embodiment of the present invention.

FIG. 2 is a vertical sectional view of a groundwater purification apparatus schematically showing another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Groundwater purification apparatus 2 Aquifer 3 Well 4 Purification apparatus 5 Water blocking body 6 Pipe 6b Upper end 7 Water intake port 8 Pumping pump 10 Baffle plate (water flow prevention member) 11 Casing (wall part) 12 Screen 27 Filter mat G Ground Gs Surface W Groundwater Ws Groundwater table

Continuing from the front page (72) Inventor Nobuaki Takasaka 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Kiharu 1-2-3 Shibaura, Minato-ku, Tokyo Shimizu Corporation Stock Company F term (reference) 4D037 AA02 AB08 AB14 BA23 BB04 BB05 CA01 CA02 CA12 4D050 AA02 AB19 AB55 BB01 BC05 CA03 CA06 CA15

Claims (4)

[Claims] 1. A groundwater purification method for removing contaminants of contaminated groundwater in an aquifer in a ground, wherein a well is excavated from the ground surface of the ground toward the aquifer, In addition, while providing a water stopping body that partitions the inside of the well up and down in a watertight manner, while providing a pipe that penetrates the water stopping body up and down, in the well above the water stopping body and below the upper end of the pipe Providing a screen that allows movement of water inside and outside the well, pumping groundwater in the aquifer through the pipe, and squirting the groundwater into the well from the upper end of the pipe; A groundwater purification method, wherein the groundwater is supplied into the ground through the screen, and air above the water stopping body in the well is suctioned and purified. 2. A groundwater purification device for removing pollutants of contaminated groundwater in an aquifer in the ground, wherein a well is provided from the ground surface of the ground to the aquifer, wherein the well is provided. A water stopping body that partitions the inside of the well up and down in a watertight manner, a pipe penetrating the water stopping body up and down, and a pump for pumping groundwater below the water stopping body above the water stopping body through the pipe. A pump that is provided above the groundwater level of the aquifer on the wall of the well, and a screen that allows movement of water inside and outside the well is provided; A groundwater purifier comprising a purifier for suctioning and purifying upper air. 3. The underground water purifying apparatus according to claim 2, wherein a water flow blocking member is provided above the upper end of the pipe for colliding a water flow spouting from the upper end of the pipe. And groundwater purification equipment. 4. The groundwater purifying apparatus according to claim 1, wherein the inside of the well is allowed to pass through the groundwater, and the passage of fine particles contained in the groundwater is regulated. A groundwater purification device, comprising: a filter mat.