CN211799049U - In-situ remediation well and system for treating underground water pollution - Google Patents

Abstract

The utility model discloses an in-situ repair well for treating groundwater pollution, which comprises an outer layer wellbore, an inner layer wellbore, a water purification component, a reaction medium and a water outlet pipe. The groundwater enters through a first water inlet hole on the outer layer wellbore The in-situ repair well, the mud and sand in the groundwater are preliminarily filtered through the first filter material, and then enter the internal water purification component from the bottom through the second water inlet hole on the inner wellbore, and pass through the second filter in the water purification unit from bottom to top. The material is filtered again to remove organic matter and ammonia nitrogen in the treated groundwater, and finally discharged through the outlet pipe. Further, an in-situ remediation system for treating groundwater pollution is also disclosed. Through the utility model, the groundwater polluted by ammonia nitrogen and organic matter can be repaired quickly, efficiently and at low cost, and the groundwater can be repaired by a combination of multiple wells alone, and it can also be combined with technologies such as osmotic reaction wall technology and in-situ bioremediation technology. Form composite treatment technology to maximize repair benefits.

Description

An in-situ remediation well and system for treating groundwater pollution

technical field

The utility model relates to the technical field of groundwater restoration, in particular to the technical field of in-situ restoration of groundwater pollution control.

Background technique

With the development of the national economy and the acceleration of urbanization, people's living standards have been greatly improved, but it has brought about a lot of environmental pollution problems. In recent years, due to the unreasonable landfill of domestic waste, illegal discharge of industrial pollutants and leakage of underground oil and gas pipelines, a large number of harmful substances have entered the groundwater system, exceeding the self-purification capacity of the groundwater system, and the groundwater pollution has become increasingly serious. Therefore, how to effectively remediate polluted groundwater has become one of the hot research issues of scholars at home and abroad.

There are more than ten existing groundwater pollution remediation technologies, which can be divided into in-situ remediation and ex-situ remediation according to their remediation locations. The ex-situ restoration technology generally pulls out the polluted water body and transports it to the surface through pipelines for treatment. This method is used when the treatment time limit is relatively tight, the treatment degree is not high, and the pollution sources are relatively concentrated. Good, but problems such as rebound and significant efficiency may occur in the later stage, resulting in poor processing results. In situ remediation technology is a technology to remediate contaminated groundwater in situ without the need for extraction process under the condition of human intervention. Reactive grid repair technology. Compared with ex-situ restoration, because in-situ restoration technology is carried out in situ, it can substantially improve the water body properties, enhance the self-purification ability of groundwater system, and has less disturbance to the stratum and groundwater. , has been applied to various types of groundwater remediation projects today.

Since the in-situ repair is carried out in the ground through reaction media such as reaction agents or fillers, it is too unpredictable, and it is difficult to control the replacement of the reaction agents or fillers. For example, the permeable reaction grid technology is an in-situ remediation technology in which a passive reaction zone filled with an active reaction medium is buried underground, and the pollutants are removed from the groundwater through adsorption, precipitation, filtration, degradation, etc. with the reaction medium. , If the reaction medium is not replaced in time after the reaction medium expires, the saturated reaction medium itself will become a source of pollution, releasing pollutants around, and the process of replacing the reaction medium must first excavate all the soil layers of the project. It is equivalent to rebuilding the original in-situ treatment project once, which is time-consuming and labor-intensive.

Utility model content

In order to solve the technical problem that it is difficult to replace reaction mediums such as reaction agents or fillers in the in-situ repair technology, the utility model discloses an in-situ repair well and a system for treating groundwater pollution, which can facilitate the replacement of reaction agents, fillers and other reaction mediums. .

The technical scheme provided by the utility model is:

An in-situ remediation well for treating groundwater pollution, comprising an outer layer wellbore, an inner layer wellbore, a water purification component, a reaction medium and a water outlet pipe;

The outer layer wellbore is a hollow cylinder structure that runs through along the length direction, and a plurality of first water inlet holes are opened on the cylinder wall;

The inner layer wellbore is a hollow cylindrical structure that runs through the length direction, and a plurality of second water inlet holes are opened at the bottom of the barrel wall; the inner layer wellbore and the outer layer wellbore are of coaxial and equal height design, and a second water inlet is arranged between the inner layer and the outer layer wellbore. a filter material;

The water purification assembly includes a plurality of water purification units sequentially arranged in the inner layer wellbore along the length direction of the inner layer wellbore, and the water purification unit is configured with a second filter material for treating organic matter and ammonia nitrogen in groundwater;

The water outlet pipe is arranged on the upper part of the side wall of the outer layer wellbore, and communicates with the inner layer wellbore and the outer layer wellbore;

The groundwater enters the in-situ repair well through the first water inlet hole on the outer wellbore, and the mud and sand in the groundwater are preliminarily filtered through the first filter material, and then enters the internal water purification component from the bottom through the second water inlet hole on the inner layer wellbore. From bottom to top, it is filtered again by the second filter material in the water purification unit to remove organic matter and ammonia nitrogen in the treated groundwater, and finally discharged through the water outlet pipe.

As a preferred solution, the water purification unit is a hollow cylindrical structure with a plurality of relatively independent packing placement cavities inside, and is equipped with an upper cover plate and a bottom plate, and the upper cover plate is provided with lifting ears and a limiter. There are several holes on the bottom plate and the side wall of the hollow cylinder.

As a preferred solution, the opening rate of the bottom plate and the side wall of the hollow cylinder is 5%, and the hole diameter is 1 cm.

As a preferred solution, the upper cover plate and the bottom plate are further provided with a connection mechanism used in conjunction with each other for fixed connection with the adjacent water purification unit.

As a preferred solution, the water purification unit has a functional component placement area, and the functional placement area of each water purification unit is connected up and down.

As a preferred solution, the material of the outer layer wellbore is precast concrete, the material of the inner layer wellbore is HDPE, and the water purification unit is made of stainless steel.

As a preferred solution, the first filter material includes at least one of crushed stone and quartz sand with a particle size of 3-5 cm.

As a preferred solution, the first water inlet holes include multiple groups distributed at equal intervals along the length direction of the outer layer wellbore, and each group includes multiple groups evenly distributed along the outer layer wellbore circumferential direction.

As a preferred solution, the second water inlet holes are distributed at the wall below two meters from the bottom of the inner layer wellbore, and are evenly distributed in a plum blossom shape.

As a preferred solution, the diameter of the outer wellbore is 2 meters, the well depth is 15 meters, and the wall thickness is 8 centimeters; the diameter of the inner layer wellbore is 1 meter, the well depth is 15 meters, and the wall thickness is 8 centimeters; the clean water The unit is 0.95 meters in diameter and 1 meter high.

As a preferred solution, the diameter of the first water inlet hole is 2 cm, and a circle is arranged every 3 meters along the length direction of the cylinder wall; the diameter of the second water inlet hole is 0.8 cm, and the hole spacing is 10 cm , evenly distributed at the wall below two meters from the bottom of the inner wellbore.

The utility model also discloses an in-situ repair system for treating groundwater pollution, which comprises a PRB underground enclosure, a water outlet regulating pool, and an in-situ repair well of any of the above schemes, wherein the PRB underground enclosure is used to The groundwater is led to the in-situ remediation well, and the outlet pipe of the in-situ remediation well is connected to a water outlet regulating tank.

The utility model has the following beneficial effects:

(1) Through the use of the internal water purification components of the in-situ repair well, it is convenient to replace the reaction medium such as reaction agents or fillers, and the groundwater polluted by ammonia nitrogen and organic matter can be repaired quickly, efficiently and at low cost.

(2) The in-situ remediation well can be used to remediate groundwater by combining multiple wells alone, or it can be combined with technologies such as Permeable Reaction Barrier (PRB, Permeable Reaction Barrier) and In-Situ Bioremediation (ISB, In-Situ Bioremediation). Form a composite treatment technology to maximize the restoration benefits.

(3) In the in-situ repaired well, the groundwater can flow hydraulically through gravity and its own pressure, and there is no need to add additional power devices for hydraulic distribution and flow, saving energy consumption.

Description of drawings

Fig. 1 is the structural schematic diagram of the in-situ repair well disclosed in the embodiment;

2 is a schematic diagram of the structure of the outer layer wellbore disclosed in the embodiment, wherein: (a) is a front view of the outer layer wellbore, and (b) is a top view of the outer layer wellbore;

3 is a schematic diagram of the inner layer wellbore structure disclosed in the embodiment;

4 is a schematic structural diagram of the water purification unit disclosed in the embodiment, wherein: (a) is a schematic structural diagram of an upper cover plate of the water purification unit, (b) is a front view of the water purification unit, and (c) is a water purification unit Schematic diagram of the structure of the bottom plate;

5 is a schematic diagram of the water flow direction of the in-situ repair well disclosed in the embodiment, wherein the arrows indicate the water flow direction;

FIG. 6 is a schematic diagram of the layout of the composite processing technology in the embodiment.

Detailed ways

In order to further understand the content of the present utility model, the following description will be given in conjunction with the accompanying drawings and specific embodiments.

1 to 5 , an in-situ remediation well (hereinafter referred to as an in-situ remediation well) for treating groundwater pollution is disclosed in the embodiment, which mainly includes an outer layer wellbore 1, an outer layer filter material 2, an inner layer Wellbore 3 , internal water purification assembly 4 , packing 5 and water outlet pipe 6 .

As shown in FIG. 2 , the outer layer wellbore 1 is a hollow cylindrical structure that penetrates up and down, the material is precast concrete, and several water inlet holes 11 are evenly distributed on the cylindrical wall. In specific applications, the diameter, depth, wall thickness and size distribution of the wellbore inlet holes can be determined according to the actual situation. In this embodiment, the diameter of the outer wellbore 1 is 2 meters, the well depth is 15 meters, and the wall thickness is 8 cm. A circle of water inlet holes 11 is arranged every 3 meters along the length of the barrel wall, and each circle of water inlet holes is in the shape of a "meter". Character arrangement (8 water inlet holes per circle), the diameter of each water inlet hole is 2 cm. As shown in Figure 2, the outer wellbore 1 is the initial water inlet and distribution point of the entire in-situ remediation well. After the groundwater enters the remediation well through the water inlet hole 11 of the outer wellbore 1, it infiltrates into the outer filter material 2. The outer filter material 2 can be selected from crushed stone, quartz sand or other various filter materials, and the particle size of the filter material depends on the specific situation. In this embodiment, the outer layer filter material 2 selects crushed stone with a particle size of 3-5 cm. The outer filter material 2 will filter out most of the pollutants such as mud and sand in the groundwater, and preliminarily treat the groundwater.

As shown in FIG. 3 , the inner wellbore 3 is also a cylindrical structure, coaxial with the outer wellbore 1 at the same height, made of HDPE, and several water inlet holes 31 are evenly distributed within 1 to 2 meters of the bottom of the wall. In specific applications, the diameter, depth, wall thickness and size distribution of the wellbore inlet holes can be determined according to the actual situation. In this embodiment, the diameter of the wellbore is 1 meter, the depth of the well is 15 meters, the wall thickness is 8 cm, and the bottom 1 meter of the wall of the well is evenly distributed with several water inlet holes 31 in a plum blossom shape, and the hole spacing is 10 cm. The diameter is 0.8 cm. The groundwater filtered by the outer layer filter material 2 enters the inner water purification component 4 from the bottom of the inner layer wellbore 3 .

The water purification assembly 4 is the core part of the groundwater treatment of the remediation well, and the water purification assembly 4 can be made into various forms according to the actual situation. As shown in FIG. 4 , the water purification component in this embodiment has functions such as hoisting, limiting, and replaceable, and various filter materials are placed inside the component. Specifically, the internal water purification component is divided into 15 water purification units, each of which is a 316L stainless steel hollow cylindrical structure with a height of 1 meter and a diameter of 0.95 meters, mainly including a cylindrical body 41, an upper cover plate 42, and a bottom plate. 43. The interior of the cylindrical body 41 is divided into four equal-sized packing placement cavities 44 and a functional component mounting area 45 , the functional component mounting area 45 is arranged at the center of the cylindrical body 41 , and the packing placement cavity 44 is connected with the functional component mounting area 45 . It is uniformly arranged in the circumferential direction of the center, wherein, each filler placement cavity 44 and the functional component installation area 45 are all penetrated to the upper cover plate 42 and the bottom plate 43 along the length direction of the cylindrical body 41 . The upper cover plate 42 is mainly used for the connection and installation of two adjacent water purification units, and the edges are provided with lifting lugs 46 and limit lugs 47, which can facilitate the water purification units to be put into and extracted from the well. The water purification units may or may not be connected to each other before. When connection is required, a connection mechanism that can be used in conjunction with the upper cover plate 42 and the bottom plate 43 may be provided. . The position of the upper cover plate 42 corresponding to the filler placement cavity 44 and the functional component installation area 45 is a hollow structure, so that the filler can be loaded and unloaded without opening the cover. The position of the bottom plate 43 corresponding to the functional component installation area 45 is a hollow structure, so that each functional component installation area 45 penetrates up and down. The side wall of the cylindrical body 41 and the bottom plate 43 are provided with a plurality of evenly distributed water inlet holes 48, the opening rate is 5%, and the diameter of the opening is 1 cm. In the design of the water purification unit in the embodiment, the cylindrical body 41, the upper cover plate 42, and the bottom plate 43 can be integrally formed, and the water purification unit has a plurality of packing placement cavities. Of course, other designs are also possible. What is necessary is just to satisfy|fill that the packing 5 in each water purification unit can contact external sewage. The functional component installation area 45 can also be designed according to requirements, including whether it is in the center position, the size of the space, etc., and can be used for placing aeration pipes, sensors, and detectors. The filler placement cavity 44 of each water purification unit is equipped with fillers 5 for treating organic matter and ammonia nitrogen in groundwater, such as adsorbent materials such as zeolite and manganese sand. In practical application, the water purification components inside the in-situ repair well can be proposed to replace the filler through the cooperation of the crane and the lifting lug, thus solving the technical problem that it is difficult to replace the reaction agent or the reaction medium such as the filler in the in-situ repair technology.

A water outlet pipe 6 is arranged horizontally at the upper part of the in-situ repair well, and the water outlet pipe 6 is connected to the inner layer wellbore 3 and the outer layer wellbore 1. The groundwater entering from the bottom of the internal water purification component 4 is processed by the filler 5 and discharged through the upper water outlet pipe 6 to the in-situ repair well. . In the embodiment, the relative elevation of the lowest water surface of the groundwater is 2.3 meters below the ground, and the elevation of the central axis of the water outlet pipe 6 of the in-situ repair well is selected to be 2.8 meters below the ground.

As shown in FIG. 6, the embodiment also discloses an in-situ remediation system for treating groundwater pollution, which includes a PRB underground enclosure 7, a water outlet regulating tank 8, and an in-situ remediation well 9 of any of the above schemes, The water outlet pipe 6 can be connected to a regulating tank 8 through a pipeline for buffering the repaired groundwater.

Further, the in-situ repaired well in this embodiment can also be combined with the funnel-gate PRB technology and the bioremediation technology to form a composite treatment technology. The polluted groundwater enters the in-situ remediation well as a funnel through the PRB groundwater enclosure 8, and enters the downstream after the in-situ remediation well combined with adsorption and bioremediation technologies.

Finally, it should be noted that, although the embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments and application fields, and the above-mentioned specific embodiments are only illustrative and instructive. Sexual, not restrictive. Those of ordinary skill in the art, under the inspiration of this specification, without departing from the scope of protection of the present utility model, can design structures and embodiments similar to the technical solution without creativity, which shall belong to the present utility model. A new range of protection.

Claims (10)

1. An in-situ remediation well for treating groundwater contamination, comprising: comprises an outer layer shaft, an inner layer shaft, a water purifying component, a reaction medium and a water outlet pipe;

the outer layer shaft is of a hollow cylindrical structure which is communicated along the length direction, and a plurality of first water inlet holes are formed in the wall of the shaft; the inner layer shaft is of a hollow cylindrical structure which is communicated along the length direction, and the bottom of the cylinder wall is provided with a plurality of second water inlet holes; the inner layer shaft and the outer layer shaft are coaxial and designed to be equal in height, and a first filter material is arranged between the inner layer shaft and the outer layer shaft;

the water purification assembly comprises a plurality of water purification units which are sequentially arranged in the inner-layer shaft along the length direction of the inner-layer shaft, and a second filter material for treating organic matters and ammonia nitrogen in underground water is configured in the water purification units;

the water outlet pipe is arranged on the upper part of the side wall of the outer layer shaft and is communicated with the inner layer shaft and the outer layer shaft;

groundwater gets into normal position restoration well by the first inlet opening on the outer pit shaft, through the silt particle in the first filter material prefilter groundwater, then gets into inside water purification subassembly by the bottom through the second inlet opening on the inner pit shaft, filters once more through the second filter material in the water purification unit from bottom to top in order to get rid of organic matter and ammonia nitrogen in the groundwater of handling, discharges through the outlet pipe at last.

2. The in-situ remediation well of claim 1, wherein the water purification unit is a hollow cylinder structure, and is provided with a plurality of relatively independent filler placing cavities inside, and is provided with an upper cover plate and a bottom plate, wherein the upper cover plate is provided with lifting lugs and limiting lugs, and the bottom plate and the side wall of the hollow cylinder are provided with a plurality of holes.

3. The in situ remediation well of claim 2 wherein said floor and side wall of said hollow cylinder have an open porosity of 5% and a bore diameter of 1 cm.

4. The in-situ remediation well of claim 2, wherein the upper cover plate and the bottom plate are further provided with a coupling mechanism for use in cooperation for fixed connection with an adjacent water purification unit.

5. The in-situ remediation well of claim 1, wherein the water purification units have a functional component placement area therein, the functional placement areas of each water purification unit being in communication with one another.

6. The in-situ remediation well of claim 1, wherein the outer wellbore is made of precast concrete, the inner wellbore is made of HDPE, and the water purification unit is made of stainless steel.

7. The in-situ remediation well of claim 1, wherein the first filter material comprises at least one of crushed stone and quartz sand with a particle size of 3-5 cm.

8. The in situ remediation well of claim 1 wherein said first inlet openings comprise a plurality of equally spaced sets along the length of the outer wellbore, each set comprising a plurality of equally spaced sets circumferentially distributed along the outer wellbore; the second water inlet holes are distributed on the cylinder wall which is two meters away from the bottom of the inner layer of the well shaft and are uniformly distributed in a plum blossom shape.

9. The in situ remediation well of claim 1 wherein said outer wellbore has a diameter of 2 meters, a well depth of 15 meters, and a wall thickness of 8 centimeters; the diameter of the inner layer shaft is 1 meter, the well depth is 15 meters, and the wall thickness is 8 centimeters; the diameter of the water purification unit is 0.95 meter, and the height of the water purification unit is 1 meter; the diameter of the first water inlet hole is 2 cm, and a circle of the first water inlet hole is arranged every 3 meters along the length direction of the cylinder wall; the diameter of the second water inlet hole is 0.8 cm, the hole distance is 10 cm, and the second water inlet holes are uniformly distributed on the wall of the inner layer shaft below two meters away from the bottom of the inner layer shaft.

10. An in-situ remediation system for treating groundwater pollution, comprising: the system comprises a PRB underground enclosure, an effluent regulating reservoir and the in-situ remediation well for treating groundwater pollution according to any one of claims 1 to 9, wherein the PRB underground enclosure is used for guiding groundwater to the in-situ remediation well, and an outlet pipe of the in-situ remediation well is connected with the effluent regulating reservoir.

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