CN218961836U - Efficient deep DNAPL polluted groundwater extraction device - Google Patents

Abstract

The utility model discloses a high-efficiency deep DNAPL polluted groundwater extraction device which comprises an extraction well, a filter material layer circumferentially arranged along the extraction well and a tubule arranged in the extraction well, wherein the top of the tubule is connected with a vacuum pump through a water outlet pipe, the bottom of the tubule is a filter tube section, an air inlet is formed in the tubule above the filter tube section, and the air inlet is connected with an air compressor through an air inlet pipe. The utility model has the advantages that: the structure is simple, and the use is convenient; can solve the deep DNAPL extraction problem.

Description

Efficient deep DNAPL polluted groundwater extraction device

Technical Field

The utility model relates to the technical field of polluted site restoration devices, in particular to a high-efficiency deep DNAPL polluted groundwater extraction device.

Background

The underground water extracting technology is one kind of common polluted underground water repairing technology, and the underground water extracting technology includes the first extracting the polluted underground water and free phase pollutant in the water bearing layer to the ground via submerged pump or other pump, the subsequent treatment in ground water treating facility to reach the standard, and the subsequent draining or other treatment to reduce the concentration of the pollutant in the underground water. The groundwater extraction and restoration technology has the advantages of simple equipment, easy operation, convenient management and the like.

Heavy non-aqueous fluids (DNAPL) are a class of organic materials that are poorly soluble in water and have a density greater than water. Because of the greater density than water and limited solubility in groundwater, once a relatively large amount of such materials enter the ground and migrate through the ground for a long period of time, they tend to be in the form of free phases on top of the lower water barrier at the bottom of the aquifer, slowly dissolving into the groundwater and releasing and forming a secondary source of groundwater pollution. The presence of DNAPL can greatly increase the difficulty of groundwater remediation, often requiring prior removal during remediation.

For a contaminated site with a restoration depth of less than 10mDNAPL, a submersible pump and other pumps can be directly used for extraction, and for a contaminated site with a restoration depth of more than 10mDNAPL, the deep (more than 10 m) DNAPL in an extraction well cannot be extracted to a ground collection tank by using a submersible pump and other pumps due to deeper depth and insufficient pressure, so that an extraction device capable of extracting deep (more than 10 m) DNAPL contaminated groundwater is needed to solve the problem.

Disclosure of Invention

According to the defects of the prior art, the utility model provides a high-efficiency deep DNAPL polluted groundwater extraction device, a tubule is arranged in an extraction well, the top of the tubule is connected with a vacuum pump through a water outlet pipe, the bottom of the tubule is a filter pipe section, an air inlet is formed above the filter pipe section of the tubule, the air inlet is connected with an air compressor through an air inlet pipe, positive pressure is formed at the bottom of the tubule by the air compressor, the deep DNAPL is extruded to a water outlet, and the deep DNAPL is extracted to gas-water separation equipment and liquid-phase separation equipment through a vacuum pump connected with the water outlet for subsequent repair, so that the deep (more than 10 m) DNAPL extraction problem is solved.

The utility model is realized by the following technical scheme:

an efficient deep DNAPL polluted groundwater extraction device is characterized in that: the device comprises an extraction well, a filter material layer circumferentially arranged along the extraction well and a tubule arranged in the extraction well, wherein the top of the tubule is connected with a vacuum pump through a water outlet pipe, the bottom of the tubule is a filter tube section, an air inlet is formed in the upper part of the filter tube section of the tubule, and the air inlet is connected with an air compressor through an air inlet pipe.

The vacuum pump is sequentially connected with the gas-water separation equipment, the liquid phase separation equipment and the collecting tank.

The length of the tubule is the same as that of the extraction well below the ground, and the filter tube section of the tubule is positioned in the filter tube section of the extraction well.

The diameter of the tubule is 20% of the diameter of the extraction well.

Clay balls are laid on the top surface of the filter material layer, and the top surface of the clay balls is level with the ground.

And the depth range of the filter tube section on the extraction well is consistent with the depth range of the filter material layer.

The utility model has the advantages that: the structure is simple, and the use is convenient; can solve the deep (> 10 m) DNAPL extraction problem.

Drawings

FIG. 1 is a schematic diagram of an efficient deep DNAPL polluted groundwater extraction device.

Detailed Description

The features of the utility model and other related features are described in further detail below by way of example in conjunction with the following figures to facilitate understanding by those skilled in the art:

as shown in fig. 1, the marks 1-14 in the drawing are respectively represented by an extraction well 1, afilter material layer 2, atubule 3, a water outlet pipe 4, avacuum pump 5, a tubulefilter pipe section 6, anair inlet pipe 7, anair compressor 8, a gas-water separation device 9, a liquidphase separation device 10, acollecting tank 11, an extraction wellfilter pipe section 12, aclay ball 13 and aground 14.

Examples: as shown in fig. 1, this embodiment relates to a high-efficiency deep DNAPL polluted groundwater extraction device, which mainly includes an extraction well 1, afilter material layer 2 circumferentially disposed along the extraction well 1, and atubule 3 disposed in the extraction well 1, wherein the length of thetubule 3 is the same as the length of the extraction well 1 below theground 14, the diameter of thetubule 3 is 20% of the diameter of the extraction well 1, the depth range of an extraction wellfilter tube section 12 of theextraction well 1 is consistent with the depth range of thefilter material layer 2, aclay ball 13 is laid on the top surface of thefilter material layer 2, and the top surface of theclay ball 13 is leveled with theground 14, in this embodiment, thetubule 3 is a UPVC (Unplasticized Polyvinyl Chloride, hard PVC) tubule. The water outlet at the top of thetubule 3 is connected with avacuum pump 5 on theground 14 through a water outlet pipe 4, the bottom is provided with a tubulefilter tube section 6, and the tubulefilter tube section 6 of thetubule 3 is positioned in an extraction wellfilter tube section 12 of the extraction well 1. Thetubule 3 is provided with an air inlet above the tubulefilter tube section 6, and the air inlet is connected with anair compressor 8 on theground 14 through anair inlet pipe 7. Thevacuum pump 5 is connected with the gas-water separation device 9, the liquidphase separation device 10 and the collectingtank 11 in sequence.

In this embodiment, anair compressor 8 is used to form positive pressure at the bottom of thetubule 3, deep layer (> 10 m) DNAPL is extruded to a water outlet, and the deep layer DNAPL is extracted to a gas-water separation device 9 and a liquid-phase separation device 10 for subsequent repair by avacuum pump 5 and collected by acollection tank 11, so as to solve the deep layer DNAPL extraction problem.

The beneficial technical effects of this embodiment are: the structure is simple, and the use is convenient; can solve the deep (> 10 m) DNAPL extraction problem.

Although the foregoing embodiments have been described in some detail with reference to the accompanying drawings, it will be appreciated by those skilled in the art that various modifications and changes may be made thereto without departing from the scope of the utility model as defined in the appended claims, and thus are not repeated herein.

Claims (6)

1. An efficient deep DNAPL polluted groundwater extraction device is characterized in that: the device comprises an extraction well, a filter material layer circumferentially arranged along the extraction well and a tubule arranged in the extraction well, wherein the top of the tubule is connected with a vacuum pump through a water outlet pipe, the bottom of the tubule is a filter tube section, an air inlet is formed in the upper part of the filter tube section of the tubule, and the air inlet is connected with an air compressor through an air inlet pipe.

2. The efficient deep DNAPL contaminated groundwater extraction device according to claim 1, wherein: the vacuum pump is sequentially connected with the gas-water separation equipment, the liquid phase separation equipment and the collecting tank.

3. The efficient deep DNAPL contaminated groundwater extraction device according to claim 1, wherein: the length of the tubule is the same as that of the extraction well below the ground, and the filter tube section of the tubule is positioned in the filter tube section of the extraction well.

4. The efficient deep DNAPL contaminated groundwater extraction device according to claim 1, wherein: the diameter of the tubule is 20% of the diameter of the extraction well.

5. The efficient deep DNAPL contaminated groundwater extraction device according to claim 1, wherein: clay balls are laid on the top surface of the filter material layer, and the top surface of the clay balls is level with the ground.

6. The efficient deep DNAPL contaminated groundwater extraction device according to claim 1, wherein: and the depth range of the filter tube section on the extraction well is consistent with the depth range of the filter material layer.

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