CN110156094B - Extraction well device for treating polluted underground water - Google Patents
Extraction well device for treating polluted underground water Download PDFInfo
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- CN110156094B CN110156094B CN201910363297.0A CN201910363297A CN110156094B CN 110156094 B CN110156094 B CN 110156094B CN 201910363297 A CN201910363297 A CN 201910363297A CN 110156094 B CN110156094 B CN 110156094B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 142
- 238000000605 extraction Methods 0.000 title claims abstract description 59
- 238000001914 filtration Methods 0.000 claims abstract description 49
- 238000005070 sampling Methods 0.000 claims abstract description 20
- 239000000463 material Substances 0.000 claims abstract description 18
- 239000003673 groundwater Substances 0.000 claims description 43
- 230000001154 acute effect Effects 0.000 claims description 18
- 238000005086 pumping Methods 0.000 claims description 16
- 238000007789 sealing Methods 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 7
- -1 polypropylene Polymers 0.000 claims description 6
- 229910001220 stainless steel Inorganic materials 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims description 6
- 229920000620 organic polymer Polymers 0.000 claims description 4
- 239000002861 polymer material Substances 0.000 claims description 4
- 239000004698 Polyethylene Substances 0.000 claims description 3
- 239000004743 Polypropylene Substances 0.000 claims description 3
- 229920004933 Terylene® Polymers 0.000 claims description 3
- 229920002978 Vinylon Polymers 0.000 claims description 3
- 230000009471 action Effects 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 3
- 229920001155 polypropylene Polymers 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims 2
- 229920006052 Chinlon® Polymers 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 13
- 230000008961 swelling Effects 0.000 abstract description 2
- 238000010276 construction Methods 0.000 description 14
- 239000004744 fabric Substances 0.000 description 12
- 238000000034 method Methods 0.000 description 10
- 238000005553 drilling Methods 0.000 description 7
- 238000004062 sedimentation Methods 0.000 description 6
- 238000003809 water extraction Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 239000002245 particle Substances 0.000 description 4
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- 229910000278 bentonite Inorganic materials 0.000 description 2
- 239000000440 bentonite Substances 0.000 description 2
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000003911 water pollution Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000007385 chemical modification Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
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- 238000006297 dehydration reaction Methods 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000003895 groundwater pollution Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/02—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention relates to an extraction well device for treating polluted underground water, which comprises a well wall unit and a vacuum extraction unit, wherein the vacuum extraction unit is provided with a water suction pipe and an air suction pump, the well wall unit comprises a plurality of tubular well pipes and water filtering pipes which are sequentially communicated from top to bottom, an anti-blocking layer and at least one water stop ring, the water filtering pipes are arranged at the bottom of an underground water sampling well, the bottom of the well is positioned in a specific stratum, the water filtering pipes are provided with tubular pipe bodies, the pipe walls are provided with a plurality of through holes, at least one filtering layer wrapped on the pipe walls, the sizes of the filtering holes in the filtering layers are smaller than the sizes of the through holes, the water stop ring is arranged at the lower end of the outer surface of the well pipe positioned at the upper part of the water filtering pipes in a surrounding mode, the water stop ring is made of water swelling materials, one end of the water suction pipe is communicated with the air suction pump, the other end of the water filtering pipes are arranged in the well pipes, and the underground water rises under the negative pressure effect generated by the vacuum extraction unit, and flows out through the water suction pipe.
Description
Technical Field
The invention belongs to the field of environmental protection, and particularly relates to an extraction well device for treating polluted underground water.
Background
The underground water pumping treatment technology is the most widely used technology in the restoration of underground water pollution sites, and the principle of the pumping treatment technology is to arrange a certain number of extraction wells on the pollution sites according to the underground water pollution range of the sites, pump the polluted underground water to the ground through a water pump or a vacuum pump, and treat the water recharging or pipe network reaching the standard. The extraction treatment technology has the advantages of simple technical principle, simple and convenient process, convenient operation and maintenance and the like.
The structure of the extraction well is one of the keys of the groundwater extraction treatment technology, and determines the extraction efficiency and success and failure of the extraction technology. The underground well for extracting underground water in polluted site is produced through drilling hole with relatively large diameter in the well site, setting the well pipe and the filtering pipe in the middle, filling filtering material between the well pipe and the well wall, and filling plugging material onto the filtering pipe. Because the underground water in the field is polluted, a large amount of polluted underground cement paste is easily leaked out by adopting a water injection method, a punching or drilling method and a casing pipe method to form a well, and the difficulty of secondary pollution control is increased, so that the well construction methods are rarely used when the polluted underground water is restored at present. The construction efficiency of the extraction well is relatively low; once the pumping well is built, the problems that the construction depth is inaccurate, the pumping effect is affected due to blockage of a filter material, and the like are relatively difficult to correct. In addition, after the underground water extraction well is used, the underground water extraction well is generally left in the field, well pipe, filter layer and sealing layer materials are difficult to take out, and adverse effects and additional treatment cost are caused for subsequent development and utilization of the field.
Disclosure of Invention
In order to simplify the well construction process, improve the well construction efficiency and facilitate the removal, an extraction well which is economical in cost and environment-friendly is sought.
The invention provides an extraction well device for treating polluted underground water, which is arranged in an underground water sampling well and is used for extracting underground water of a specific stratum, and the device has the characteristics that the device comprises a well wall unit and a vacuum extraction unit, wherein the vacuum extraction unit is provided with a water suction pipe and an air suction pump, and the well wall unit comprises: a plurality of well pipes and drainage pipe, anti-blocking layer and at least one water stop ring that are tubular that communicate in proper order from top to bottom, wherein, the drainage pipe sets up the bottom of underground water sampling well, and this bottom of the well is located the specific stratum, and the drainage pipe has: the tubular pipe body is provided with a pipe wall, a plurality of through holes are formed in the pipe wall, at least one layer of filter layer is wrapped on the pipe wall, the size of a filter hole in the filter layer is smaller than that of the through holes, the anti-blocking layer is of a net structure, the anti-blocking layer is arranged on the pipe wall in a surrounding mode and located between the pipe wall and the filter layer and used for supporting the filter layer and preventing the through holes from being blocked, the water stop ring is arranged at the lower end of the outer surface of a well pipe located on the upper portion of the filter pipe in a surrounding mode, the water stop ring is made of a water swelling material, one end of a water pumping pipe is communicated with an air pumping pump, the other end of the water pumping pipe is arranged in the well pipe, groundwater rises under the negative pressure effect generated by a vacuum extraction unit, and flows out through the water pumping pipe.
In the extraction well device for treating polluted groundwater provided by the invention, the device can also have the following characteristics: wherein, the well lid sets up on the well head, with well head sealing connection, is provided with the through-hole that lets the drinking-water pipe pass through on the well lid.
In addition, in the extraction well device for treating polluted groundwater provided by the invention, the device can also have the following characteristics: wherein, the contained angle of the water flow direction passing through the through hole and the pipe wall is an acute angle.
In addition, in the extraction well device for treating polluted groundwater provided by the invention, the device can also have the following characteristics: the central line of the through hole is perpendicular to the central line of the pipe body, or the included angle between the central line of the through hole and the downward direction of the central line of the pipe body is an acute angle, or the included angle between the central line of the through hole and the upward direction of the central line of the pipe body is an acute angle.
In addition, in the extraction well device for treating polluted groundwater provided by the invention, the device can also have the following characteristics: wherein the through hole is arc-shaped at the edge of the pipe wall.
In addition, in the extraction well device for treating polluted groundwater provided by the invention, the device can also have the following characteristics: the pipe wall comprises an upper wall part, a middle wall part and a lower wall part from top to bottom, the through holes comprise an upper through hole arranged on the upper wall part, a middle through hole arranged on the middle wall part and a lower through hole arranged on the lower wall part, an included angle between the central line of the upper through hole and the downward direction of the central line of the pipe body is an acute angle, the central line of the middle through hole is vertical to the central line of the pipe body, and an included angle between the central line of the lower through hole and the upward direction of the central line of the pipe body is an acute angle.
In addition, in the extraction well device for treating polluted groundwater provided by the invention, the device can also have the following characteristics: the cross section of the through hole is any one of a circle, an ellipse and a strip.
In addition, in the extraction well device for treating polluted groundwater provided by the invention, the device can also have the following characteristics: wherein the filter layer has a plurality of layers,
The multi-layer filter layer has the same filter hole shape, the filter hole positions in two adjacent filter layers are staggered, or the multi-layer filter layer is composed of a plurality of filter layers with different filter hole shapes, and the filter layers with different filter hole shapes are crossly arranged. In addition, in the extraction well device for treating polluted groundwater provided by the invention, the device can also have the following characteristics: wherein the filter layer is made of low-adsorptivity stainless steel or organic polymer material.
In addition, in the extraction well device for treating polluted groundwater provided by the invention, the device can also have the following characteristics: wherein the filter layer is made of any one of terylene, polypropylene, nylon (nylon), vinylon and polyethylene.
In addition, in the extraction well device for treating polluted groundwater provided by the invention, the device can also have the following characteristics: wherein, the well pipe and the pipe body are made of PVC or stainless steel materials.
Effects and effects of the invention
According to the extraction well device for treating polluted underground water, because the water filtering pipe is arranged at the bottom of the underground water sampling well and is used for filtering the underground water of a specific stratum, the water filtering pipe is provided with at least one filtering layer wrapped on the pipe body and is used for filtering soil particles and suspended matters, and a filtering layer is not required to be filled between the water filtering pipe and a well wall, so that not only is the material and transportation labor cost saved, but also adverse effects on subsequent development and utilization of a field caused by the fact that the filtering layer and the sealing layer are difficult to take out are avoided.
In addition, the underground water extraction well device adopts a plurality of well pipes which are manufactured in a modularized mode to be connected with the water filtering pipes, so that the assembly and the installation are convenient, the well pipes and the water filtering pipes can be taken out after the detection well is used, and the well pipes and the water filtering pipes can be recycled after being processed.
Further, the water stop ring arranged between the well pipe and the well hole wall seals the gap between the well pipe and the well wall of the sampling well after being expanded by water, and underground water below the water stop ring flows into the pipe body from outside the pipe body through the filter layer, so that a sealing layer is not required to be filled between the well pipe and the well hole wall, and the water stop ring has the beneficial effect of accurately extracting a target layer.
Further, because the vacuum extraction unit is arranged, the groundwater is lifted and extracted under the action of negative pressure generated by the vacuum extraction unit, and the groundwater outlet efficiency is greatly improved.
Therefore, the extraction well device provided by the invention not only can effectively simplify the well construction process, improve the well construction efficiency and accurately extract the target layer, but also can conveniently remove the well pipe and the water filtering pipe, can be recycled after being treated, and is convenient for subsequent development and utilization of sites.
Drawings
FIG. 1 is a schematic diagram of an extraction well apparatus for treating contaminated groundwater in an embodiment of the invention;
FIG. 2 is a schematic view of a water filter tube body in an embodiment of the invention;
FIG. 3 is a schematic cross-sectional view of a via in an embodiment of the invention;
FIG. 4 is a schematic cross-sectional view of a via in an embodiment of the invention;
FIG. 5 is a schematic view of a filter layer in an embodiment of the invention; and
FIG. 6 is a schematic diagram of an anti-blocking layer in an embodiment of the invention.
Detailed Description
In order to make the technical means, creation characteristics, achievement of objects and effects achieved by the present invention easy to understand, the following embodiments specifically describe the extraction well device for treating contaminated groundwater according to the present invention with reference to the accompanying drawings.
Example 1
The extraction well device for treating the polluted underground water is arranged in the underground water sampling well and is used for extracting the underground water of a specific stratum, filtering the underground water and then pumping the polluted underground water to be treated to a designated place through a pumping pipe under the action of negative pressure generated by the vacuum extraction unit for sewage treatment.
As shown in fig. 1, the extraction well device comprises a plurality of tubular well pipes 7, a water filtering pipe 11, a water stop ring 10, a well mouth protecting cover 6, a sampling well cover 8 and a vacuum extraction unit which are sequentially communicated from top to bottom.
The well pipe 7 is cylindrical, and two adjacent well pipes 7 are connected in a threaded or snap connection mode, in the embodiment, the well pipe 7 is made of PVC or stainless steel materials, and a section of the well pipe 7 is 3 meters or so and is connected in a threaded mode. When threaded connection is adopted, the upper end of the well pipe 7 is provided with internal threads, and the outer diameter of the connection part of the lower end is reduced and is provided with external threads matched with the internal threads.
In addition, two adjacent well pipes 7 can be connected by adopting a connecting piece, external threads are respectively arranged at two ends of the well pipe 7, the connecting piece is annular, and internal threads matched with the external threads are arranged in the annular.
In the embodiment, well pipe 7 and drainage pipe 11 are also assembled through threaded connection, put into the sampling underground together to improve the efficiency of building the well, well head visor 6 sets up on the well pipe 7 mouthful on the top, and sample well lid 8 is the annular setting on ground, and well pipe 7 passes from sample well lid 8, and sample well lid 8 is used for sheltering from the space between the wall of well pipe 7 and sample well.
The water filtering pipe 11 is arranged at the bottom of the underground water sampling well of a specific stratum at a preset depth and comprises a cylindrical pipe body 3, at least one layer of filtering layer 4 and an anti-blocking layer 5, and the length of the water filtering pipe 11 is generally 100mm-20000mm according to the hydrogeological structure and water taking requirements.
The bottom of the tube body 3 may be closed or not. In an embodiment, the bottom of the tube body 3 is closed.
As shown in fig. 2, the upper end of the pipe body 3 is provided with an internal thread 1, the pipe wall of the pipe body 3 is provided with a plurality of through holes 2, and the section of the through holes 2 can be any one of a round shape, an oval shape and a long strip shape.
The direction of the through holes 2 is designed according to different pollutants in the groundwater, and one case is that the center line of the through holes 2 is perpendicular to the center line of the pipe body 3, so that the water flow direction passing through the through holes 2 is perpendicular to the center line of the pipe body 3.
Or the included angle between the center line of the through hole 2 and the center line of the pipe body 3 in the downward direction is an acute angle.
When the water flow direction a passes through the through-hole 2as shown in fig. 3, it is suitable for groundwater containing oil, because the oil-containing substance is easily floating up and easily passes through the hole.
Or the included angle between the center line of the through hole 2 and the upward direction of the center line of the pipe body 3 is an acute angle.
When the water flow direction B passes through the through-holes 2 as shown in fig. 4, it is suitable for heavy non-aqueous liquid contaminants to pass through such through-holes.
When the acute angle is 45 degrees, the water flow has better effect.
Further, the edge of the pipe wall of the through hole 2 is arc-shaped, namely, the joint of the through hole 2 and the pipe wall is arc-shaped, so that suspended matters in the underground water are not easy to deposit at the joint. In the embodiment, the pipe body 3 is cylindrical and made of PVC material, the cross section of the pipe body 3 is the same as that of the well pipe 7, the center line of the through hole 2 is perpendicular to the center line of the pipe body 3, the cross section of the through hole 2 is circular, the diameter of the through hole 2 is 2mm-4mm, and the distance between adjacent round holes is 3mm-5mm.
At least one filter layer 4 shown in figure 4 is wrapped on the wall of the pipe body 3 to filter the suspended matters in the groundwater.
The size of the filter holes in the filter layer 4 is smaller than the size of the through holes 2.
Wherein the filter layer 4 has a plurality of layers,
The filter layers 4 have the same filter hole shape, and the filter hole positions in two adjacent filter layers 4 are staggered;
or the multi-layer filter layer 4 is composed of a plurality of filter layers 4 having different filter pore shapes, and the plurality of filter layers 4 having different filter pore shapes are disposed to intersect.
The filter layer 4 can have 5-20 layers according to hydrogeology of the water taking layer and water taking requirements. The filter layer 4 is made of low-adsorptivity stainless steel or organic polymer materials.
In the embodiment, the filter layer 4 is wrapped by filter cloth with the same shape of the multi-layer filter holes, or is wrapped by filter cloth with different shapes of the multi-layer filter holes, and the filter cloth is made of organic polymer materials with poor adsorptivity and good stability, such as any one of terylene, polypropylene, nylon, vinylon, polyethylene, mixed fiber and resin.
The filter holes in the filter cloth can be rectangular, diamond-shaped and the like, the filter holes of each layer of filter cloth can be identical, and the filter holes in two adjacent layers of filter cloth 4 are staggered.
Or the shape of the filter holes of each layer of filter cloth can be different, and a plurality of filter layers 4 with different filter hole shapes are arranged in a crossing way.
The filter layer 4 after the superposition of multiple layers can obtain smaller filter holes, and can more effectively play a role in filtration.
In the embodiment, the gaps of the filter cloth are divided into three specifications of coarse, medium and fine, the unit area mass of the filter cloth is 100g/m 2、450g/m2、800g/m2, the equivalent pore diameters of the filter cloth are 0.2mm, 0.14mm and 0.07mm respectively, and the filter cloth is insoluble in organic pollutants and resistant to acid and alkali at the normal temperature (15-17 ℃) of the groundwater.
Thus, the size of the filter holes in the filter layer 4 is smaller than the size of the through holes 2, i.e. the largest size in the equivalent pore size of the filter layer 4 is smaller than the smallest size in the through holes 2.
An anti-blocking layer 5 is arranged between the pipe body 3 and the filter layer 4 in order to avoid fouling of the through holes 2.
The anti-blocking layer 5 with a net structure is circumferentially arranged on the pipe wall and positioned between the pipe wall and the filter layer 4 and is used for supporting the filter layer 4 and preventing the through holes 2 from being blocked.
The anti-blocking layer 5 has the functions of supporting, isolating and blocking, as shown in fig. 6, a plurality of through holes are formed in the anti-blocking layer 5. In the embodiment, the filtering layer 4 is separated from the outer wall of the pipe body 3 by an anti-blocking layer 5 made of a plastic net.
A water stop ring 10 is arranged around the lower end of the outer surface of the well pipe 7 in the upper part of the drainage pipe 11, between the well pipe 7 and the wall of the sampling well.
In order to ensure the water-stopping effect, a plurality of water-stopping rings 10 may be provided, and a plurality of water-stopping rings 10 may be provided in parallel from bottom to top at intervals at the lower end of the outer surface of the well pipe 7 located at the upper portion of the water filter pipe 11.
As shown in fig. 1, the water stop ring 10 is arranged on the well pipe 7, the water stop ring 10 is made of a water-swelling rubber material, the expansion coefficient of the rubber material is 1.5-3, and no secondary pollution is caused; or the bentonite is made of water permeable material and is wrapped in the water permeable material and subjected to physical and chemical modification, and the bentonite has good water expansibility between pH 2 and 13, expansion coefficient of 0.5 to 1.5, light weight, good plasticity and no secondary pollution.
In the embodiment, the water stop ring 10 is made of a water-swelling rubber material, the water stop ring 10 is connected with the well pipe 7 in a bonding way, and the number of the water stop rings 10 is one.
The water-swelling water stop ring 10 has similar function to a sealing layer in a traditional well construction mode, swells after meeting water, and has the water stop effect. The water stop ring 10 seals the gap between the well pipe 7 and the wall of the sampling well after being expanded by water, and the underground water below the water stop ring 10 flows into the pipe body 3 from the outside of the pipe body 3 through the filter layer 4.
The water stop ring 10 is simple and convenient to install, and can effectively improve the well construction efficiency. In addition, the water-swelling water stop ring 10 can shrink slowly after dehydration, after the inspection well is used, the well pipe can be conveniently removed, and the well pipe can be recycled after treatment, so that the cost is saved.
The vacuum extraction unit comprises a water suction pipe 12, a valve 13, a gas-liquid separator 14 and a water suction pump 15.
The well mouth protecting cover 6 is arranged on the well mouth and is in sealing connection with the well mouth, and a through hole for the water pumping pipe 12 to pass through is arranged on the well mouth protecting cover 6.
One end of the water suction pipe 12 is communicated with the gas-liquid separator 14, the other end is arranged above the underground water surface, and the valve 13 is arranged on the water suction pipe 12. The water pump 15 is communicated with the gas-liquid separator 14 through a pipeline. In the embodiment, the suction pump 15 is disposed on the ground.
After the valve 13 and the water suction pump 15 are opened, the negative pressure generated by the water suction pump 15 enables the groundwater to be treated to rise, the groundwater passes through the filter layer 4, large suspended particles are filtered, the filtered groundwater enters the filter pipe 11 through the through hole 2, and the risen groundwater is pumped out and collected to a designated place in the well pipe 7 through the water suction pipe 12 for sewage treatment.
In the embodiment, the vacuum degree is controlled between 0 and 0.099Mpa, and the flow of the water suction pump is 5L to 30m 3/min.
A modularized groundwater extraction well construction method comprises the following steps:
Selecting the position of a groundwater detection well, selecting a proper drilling method according to a soil layer geological structure, and starting the drilling operation of a sampling well, wherein the aperture of the sampling well is larger than the sum of the outer diameter of a well pipe and the thicknesses of 2 water stop rings;
completing the drilling operation of the sample well bore when drilling to cover the pumping target layer;
Sequentially connecting a plurality of well pipes and water filtering pipes, and attaching a water stop ring on the outer wall of the well pipe in a surrounding manner to form an underground water extraction well device;
placing an underground water extraction well device in a sampling well;
Installing a vacuum extraction unit and a wellhead protection cover;
And (5) completing the rapid construction of the underground water extraction well device.
Example two
Other structures of this embodiment are the same as those of the first embodiment except that the tube body structure of the filter tube is different from that of the first embodiment.
In this embodiment, the pipe body is a cylindrical pipe body, and has a pipe wall, and a plurality of through holes are provided on the pipe wall, and the bottom of the pipe body may be closed or not closed. In an embodiment, the bottom of the tube is closed.
Wherein the tube wall comprises an upper wall part, a middle wall part and a lower wall part from top to bottom,
The plurality of through holes includes an upper through hole provided on the upper wall portion, a middle through hole provided on the middle wall portion, and a lower through hole provided on the lower wall portion, respectively.
The included angle between the center line of the upper through hole and the downward direction of the center line of the pipe body is an acute angle.
The center line of the middle through hole is perpendicular to the center line of the pipe body.
The included angle between the center line of the lower through hole and the upward direction of the center line of the pipe body is an acute angle.
Example III
The other structures of this embodiment are the same as those of the first embodiment except that the structure of the water pipe and the installation position of the water stop ring are different from those of the first embodiment.
The water filtering pipe comprises a pipe body, at least one filtering layer and a water stopping ring.
The tubular pipe body is provided with a pipe wall and comprises a pipe wall upper part and a pipe wall lower part, and the pipe wall lower part is provided with a plurality of through holes;
at least one filter layer is wrapped at the lower part of the pipe wall;
The water stop ring is arranged around the upper part of the pipe wall and is positioned between the well pipe 7 and the wall of the sampling well.
Wherein the center line of the through hole is vertical to the center line of the pipe body,
Or the included angle between the center line of the through hole and the downward direction of the center line of the pipe body is an acute angle,
Or the included angle between the center line of the through hole and the upward direction of the center line of the pipe body is an acute angle.
Example IV
Other structures of the present embodiment are the same as those of the third embodiment except for the structure of the tube body and the difference from the third embodiment.
In this embodiment, the lower portion of the tube wall includes an upper wall portion, a middle wall portion, and a lower wall portion from top to bottom.
The plurality of through holes includes an upper through hole provided on the upper wall portion, a middle through hole provided on the middle wall portion, and a lower through hole provided on the lower wall portion, respectively.
The included angle between the center line of the upper through hole and the downward direction of the center line of the pipe body is an acute angle.
The center line of the middle through hole is perpendicular to the center line of the pipe body.
The included angle between the center line of the lower through hole and the upward direction of the center line of the pipe body is an acute angle.
Example five
The other structures of this embodiment are the same as those of the first embodiment except that the body structure of the filter tube is different from that of the first embodiment and has a settling tube.
In the embodiment, the sedimentation tube is cylindrical, the bottom is closed, the sedimentation tube is arranged at the bottom of the well, and the length of the sedimentation tube is 0.5-1.0m. The sedimentation pipe is used for containing sediment.
The filter pipe is positioned at the upper part of the sedimentation pipe, the bottom of the filter pipe is not closed, and the lower part of the filter pipe is communicated with the sedimentation pipe.
Example 1
The ground water of a certain chemical plant is polluted, and the repairing scheme adopts a pumping treatment method. According to the geological prospecting result of the field, the stratum of the field is filled with the miscellaneous soil from 0 to 1.4m, clay from 1.4 to 5.5m, powdery clay from 5.5 to 10m and silt from 10 to 16.3m in sequence from top to bottom. The grain size of the silt is 0.05mm-1mm. The investigation result shows that the polluted groundwater is mainly distributed in the silt layer. According to the method of the invention, a pumping well of 17m is arranged, the drilling hole is deep to 17m, the novel PVC water filtering pipe 7m and the novel PVC well pipe 10m are assembled and put into the well, and the pipe diameter is 100mm. According to the possible particle size of pollutants and gravel sand in the underground water, the specification of 850g/m 2 is selected for the filter cloth, and 5 layers are wrapped. The diameter of the water filtering holes is 3mm, and the distance is 5mm.
In summary, the present invention has been described with respect to only one example of a gravel layer groundwater pollution construction extraction well, but the present invention is not limited thereto, and those skilled in the art will recognize that any changes and modifications may be made without departing from the scope of the claims of the present invention.
Effects and effects of the examples
According to the extraction well device for treating polluted underground water, which is disclosed by the embodiment of the invention, because the water filtering pipe is arranged at the bottom of the underground water sampling well and is used for filtering underground water of a specific stratum, the water filtering pipe is provided with at least one filtering layer wrapped on the pipe body and is used for filtering soil particles and suspended matters, so that a filtering layer does not need to be filled between the water filtering pipe and a well wall, the material and transportation labor cost are saved, the underground water well pipe can be conveniently removed, and the subsequent utilization of a place is not adversely affected.
In addition, the extraction well device adopts a plurality of well pipes which are manufactured in a modularized mode to be connected with the water filtering pipe, so that the assembly and the installation are convenient, and the well pipes can be recycled after being removed after being used.
Further, a water stop ring arranged between the well pipe and the well wall of the sampling well seals a gap between the well pipe and the well wall of the sampling well after the water stop ring swells in water, and groundwater below the water stop ring flows into the pipe body from outside the pipe body through a filter layer, so that a sealing layer is not required to be filled between the well pipe and the well wall, and the subsequent removal of the well pipe is facilitated.
Therefore, the extraction well device of the embodiment not only can simplify the well construction process and improve the well construction efficiency, but also can recycle the well pipe and the filter pipe after being processed.
The above embodiments are preferred examples of the present invention, and are not intended to limit the scope of the present invention.
Claims (10)
1. An extraction well device for treating contaminated groundwater, disposed in a groundwater sampling well, for extracting groundwater from a specific formation, comprising:
a well wall unit and a vacuum extraction unit,
Wherein the vacuum extraction unit is provided with a water suction pipe, a valve, a gas-liquid separator and a water suction pump,
The borehole wall unit comprises:
A plurality of tubular well pipes and water filtering pipes which are sequentially communicated from top to bottom, an anti-blocking layer and at least one water stop ring,
Wherein the water filter is disposed at a bottom of the groundwater sampling well, the bottom being located in the specific formation, the water filter having:
a tubular pipe body which is provided with a pipe wall, a plurality of through holes are arranged on the pipe wall,
At least one filter layer wrapped on the pipe wall,
The size of the filtering holes in the filtering layer is smaller than that of the through holes,
An anti-blocking layer with a net structure, which is arranged on the pipe wall in a surrounding way and is positioned between the pipe wall and the filtering layer for supporting the filtering layer and preventing the through holes from being blocked,
The water stop ring is arranged at the lower end of the outer surface of the well pipe at the upper part of the water filtering pipe in a surrounding way,
The water stop ring is made of water-swelling material,
One end of the water suction pipe is communicated with the gas-liquid separator, the other end of the water suction pipe is arranged above the underground water surface, the valve is arranged on the water suction pipe, the water suction pump is communicated with the gas-liquid separator through a pipeline,
The groundwater rises under the action of negative pressure generated by the vacuum extraction unit and flows out through the water pumping pipe.
2. Extraction well device for the treatment of contaminated groundwater according to claim 1, characterized in that:
The wellhead protection cover is arranged on a wellhead and is in sealing connection with the wellhead, and a through hole for the water pumping pipe to pass through is formed in the wellhead protection cover.
3. Extraction well device for the treatment of contaminated groundwater according to claim 1, characterized in that:
wherein the center line of the through hole is vertical to the center line of the pipe body,
Or the included angle between the center line of the through hole and the downward direction of the center line of the pipe body is an acute angle,
Or the included angle between the center line of the through hole and the upward direction of the center line of the pipe body is an acute angle.
4. Extraction well device for the treatment of contaminated groundwater according to claim 1, characterized in that:
Wherein the through holes are arc-shaped at the edge of the pipe wall.
5. Extraction well device for the treatment of contaminated groundwater according to claim 1, characterized in that:
Wherein the tube wall comprises an upper wall part, a middle wall part and a lower wall part from top to bottom,
The plurality of through holes include an upper through hole provided on the upper wall portion, a middle through hole provided on the middle wall portion, and a lower through hole provided on the lower wall portion, respectively,
The included angle between the center line of the upper through hole and the downward direction of the center line of the pipe body is an acute angle,
The central line of the middle through hole is vertical to the central line of the pipe body,
And an included angle between the center line of the lower through hole and the upward direction of the center line of the pipe body is an acute angle.
6. Extraction well device for the treatment of contaminated groundwater according to claim 1, characterized in that:
The cross section of the through hole is any one of a round shape, an oval shape and a strip shape.
7. Extraction well device for the treatment of contaminated groundwater according to claim 1, characterized in that:
Wherein the filter layer has a plurality of layers,
The filter layers have the same filter hole shape, the filter hole positions in two adjacent filter layers are staggered,
Or the multiple layers of filter layers are formed by multiple filter layers with different filter hole shapes, and the multiple filter layers with different filter hole shapes are arranged in a crossing way.
8. Extraction well device for the treatment of contaminated groundwater according to claim 1, characterized in that:
wherein the filter layer is made of low-adsorptivity stainless steel or organic polymer materials.
9. Extraction well device for the treatment of contaminated groundwater according to claim 1, characterized in that:
Wherein the filter layer is made of any one of terylene, polypropylene, chinlon, vinylon and polyethylene.
10. Extraction well device for the treatment of contaminated groundwater according to claim 1, characterized in that:
Wherein, the well pipe and the pipe body are both made of PVC or stainless steel materials.
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| CN111395995B (en) * | 2020-03-19 | 2021-10-29 | 丰电阳光(北京)清洁能源技术有限公司 | Secondary well completion method for aquifer energy storage well |
| CN113087043B (en) * | 2021-04-25 | 2022-06-21 | 清华大学 | Device and method for repairing underground water polluted by LNAPL (Low noise alkaline peroxide solution) |
| CN116379625A (en) * | 2023-03-21 | 2023-07-04 | 山东省煤田地质局第一勘探队 | Variable-diameter internal spiral type coaxial buried pipe heat exchanger structure |
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