CN116143301A - A Groundwater Pollution Source Control System Based on Interception and Adsorption - Google Patents

Abstract

The invention discloses a groundwater pollution source control system based on interception and adsorption. By setting an extraction unit and an adsorption degradation unit at the boundary position of the resistance control area close to the pollution source, the groundwater with pollutants flowing through the pollution source from the upstream is When it flows to the resistance control area, the organic pollutants in the groundwater can be adsorbed by the adsorption material of the adsorption degradation unit first, and the organic pollutants can be biodegraded by the microorganisms in the adsorption material, and then the remaining pollutants can be extracted with the groundwater. The equipment is extracted to the outside of the extraction well for secondary sewage treatment; thus, the present invention can not only realize the initial pollution repair of the groundwater, but also physically extract the remaining pollutants to the outside of the extraction well, so as to prevent the pollution source from flowing into the well. Diffusion of the controlled area; moreover, the implementation of the present invention is not limited by the conditions of the site where the controlled area is located, and has little disturbance to the underground.

Description

A Groundwater Pollution Source Control System Based on Interception and Adsorption

technical field

The invention relates to the technical field of groundwater and soil remediation treatment, in particular to a groundwater pollution source control system based on interception and adsorption.

Background technique

In recent years, with the development of industry and agriculture, groundwater pollution has gradually increased, which has become a research hotspot at home and abroad. Due to the concealment, hysteresis, complexity and difficulty of recovery of groundwater pollution, most of the control measures for groundwater and groundwater pollution sources in China use the barrier wall technology.

In actual engineering, the barrier wall is widely used in the prevention and control of heavy metals and organic pollutants in polluted plots, and landfill leachate. Changes in the groundwater level have a significant effect on the stress properties of subsurface structures, resulting in a continuous decrease in the compressive strength of concrete over time. The water load will cause damage to the vertical barrier wall, and the pore water pressure accelerates the damage of the barrier wall and the expansion of micro-cracks, thereby affecting the impermeability and service life of the barrier wall. PRB technology has excellent repair and control effects, and also has good safety, stability, and economy; however, it is prone to blockage, difficult to maintain, affects actual results, and is difficult to implement in active petrochemical sites. The traditional groundwater pollution barrier wall technology often only considers the barrier effect of the barrier wall itself, while ignoring the damage and blockage of the wall by groundwater pressure, as well as the removal and treatment of pollution sources; resulting in failure to achieve the barrier control effect and service life, pollution sources are difficult to clear. Moreover, the active site is high-risk, the foundation of underground structures and pipelines are complex, and the construction conditions for continuous barrier walls are not available, and the construction is extremely difficult.

Contents of the invention

The technical problem to be solved by the present invention is to provide a groundwater pollution source control system based on interception and adsorption to solve the problems that the existing groundwater pollution barrier technology is limited by the site, difficult to construct, and inconvenient to repair the pollution source.

To solve the problems of the technologies described above, the technical scheme adopted in the present invention is as follows:

A groundwater pollution source control system based on interception and adsorption, which is suitable for the situation where the resistance control area is located in the downstream of the pollution source, and is characterized in that it includes: an extraction unit and an adsorption degradation unit, both of which are arranged in the resistance control area close to the pollution source border position;

The extraction unit is provided with extraction equipment and a plurality of extraction wells, the extraction equipment can extract the groundwater in each extraction well, each extraction well is arranged at intervals along a straight line section, and the straight line section is perpendicular to the The groundwater flow direction of the groundwater; wherein, the well diameter of the extraction well is screened according to the requirements and conditions, generally 110mm, and the opening position of the extraction well for external groundwater to flow into its interior corresponds to the thickness of the underground aquifer set up.

The position of the adsorption degradation unit in the groundwater is not located downstream of the extraction well, the adsorption degradation unit is provided with an adsorption material capable of adsorbing organic pollutants in the ground water, and the adsorption material is injected with Microorganisms that biodegrade organic pollutants. Among them, the selection of the adsorption material should follow the principle of long life, and the best adsorption effect on common organic pollutants in groundwater such as alkanes, petroleum hydrocarbons, benzene series, halogenated hydrocarbons, and chlorinated hydrocarbons, and can be reused and easily handled, and It is harmless to the human body and does not affect groundwater quality. Generally, activated carbon and zeolite molecular sieves are preferred. The microorganisms should be selected from the indigenous microorganisms where the resistance control area is located, and should follow the principles of no selectivity to the organic pollutants, easy survival underground, harmless to the human body, little impact on the underground environment, and long life.

Thereby, the operating principle of the underground water pollution source control system of the present invention is:

When the groundwater with pollutants flowing through the pollution source from the upstream flows to the resistance control area, the organic pollutants in the groundwater can be adsorbed by the adsorption material of the adsorption degradation unit first, and the organic pollutants can be treated by the microorganisms in the adsorption material. Biodegradation, and then the remaining pollutants are extracted by the extraction equipment with the groundwater to the outside of the extraction well for secondary sewage treatment; thus, the present invention can not only realize the initial pollution repair of the groundwater, but also remove the remaining pollutants through physical The method is extracted to the outside of the extraction well to prevent the pollution source from spreading to the control area;

Moreover, the implementation of the present invention is not limited by the conditions of the site where the blockage control area is located, and has little disturbance to the underground. It can be used as a pollution source risk control measure, and can also be used for soil and groundwater restoration.

As a preferred embodiment of the present invention: as shown in Figures 1 to 3, the adsorption and degradation unit is provided with a plurality of interception wells, all of which are arranged at regular intervals perpendicular to the flow direction of the groundwater, and located in the extraction the upstream location of the well;

Referring to Fig. 2, the interception well is provided with an interception well screen hole for external groundwater to flow into it, the screen opening position of the interception well screen hole is designed according to the position of vertically intercepting organic pollutants, and the well diameter of the interception well can be adjusted according to requirements. and conditions are selected; the interior of the interception well is fixed with a lower nozzle plugging and a coaxially arranged interception well large-diameter screen and an interception well small-diameter screen, and the interception well large-diameter screen and interception small-diameter screen The space between is filled with the adsorption material to form an interception well adsorption column, and the microorganisms are injected into the interception well adsorption column;

And, the effective range of the adsorption column of the interception well in the interception well to adsorb organic pollutants in groundwater is defined as the adsorption influence range, which is a cylindrical range coaxial with the adsorption column of the interception well, and two adjacent interception wells The range of influence of adsorption partially overlaps;

During the working period of the groundwater pollution source control system, the extraction equipment controls whether to extract the groundwater in the corresponding extraction well according to the groundwater level in each extraction well, that is: the groundwater level in any extraction well rises to the preset level When the upper limit water level is reached, the extraction equipment will pump out the groundwater in this extraction well; when the groundwater level in any extraction well drops to the preset lower limit water level, the extraction equipment will stop for this extraction well pumping.

Thereby, the working principle of the groundwater pollution source control system of Embodiment 2 of the present invention is:

Referring to Fig. 1 and Fig. 2, the present invention adopts a plurality of interception wells arranged at even intervals perpendicular to the flow direction of groundwater as adsorption degradation units, and an adsorption column of interception wells is formed inside each interception well, and the interception wells are arranged in the pumping The upstream position of the well is raised so that: the groundwater from the upstream reaches the interception well first, and enters the groundwater within the adsorption influence range of each interception well, and the organic pollutants in it are adsorbed to the interception well under the adsorption of the adsorption column of the corresponding interception well In the adsorption column, the microorganisms in it biodegrade the organic pollutants, thus, each interception well forms a barrier adsorption wall of a discontinuous entity that can intercept, adsorb and degrade organic pollutants in groundwater;

Moreover, the present invention controls the extraction equipment to intermittently extract the groundwater in the extraction well by adopting a method of comparing the groundwater level, so that the organic pollutants not intercepted by the interception well flow from the interval between the interception wells to the groundwater along with the groundwater. When extracting the well, the extraction equipment pumps out the groundwater through the extraction well to realize the extraction of pollutants in the groundwater, so as to prevent the pollution source from spreading into the resistance control area; and the intermittent extraction of the groundwater by the extraction well can Control the flow direction of the groundwater so that the groundwater flows through the interception well instead of bypassing it, which helps to improve the interception efficiency of the interception well for organic pollutants, and can intermittently increase the flow rate of the groundwater to speed up the renewal of the groundwater in the control area process;

Wherein, the adsorption material is filled between the large-diameter screen of the interception well and the small-diameter screen of the interception well to form an adsorption column of the interception well, and builds a biofilm, which can improve the adsorption capacity of the adsorption material for organic pollutants and prolong the life of the adsorption material. service life.

Preferably: referring to Fig. 1, the number of the extraction wells is one less than the number of the interception wells, and each of the extraction wells is located 0.5m to 1m. Therefore, each extraction well is located at the weakest position where the barrier adsorption wall formed by each interception well has the worst interception effect on organic pollutants, so as to achieve the optimal extraction effect of the extraction wells on groundwater pollutants.

Preferably: referring to Fig. 2, the groundwater pollution source control system is also provided with an oxygen supply system, and the oxygen supply pipe of the oxygen supply system penetrates into the lumen of the small-diameter screen of the interception well and extends to the bottom position. Therefore, through the oxygen supply system, continuous aeration at an appropriate pressure provides an aerobic environment for the adsorption column of the interception well, so as to accelerate the biodegradation rate of organic pollutants by microorganisms.

Wherein, the pipe section of the oxygen supply pipe located in the interception well is preferably equipped with an oxygen supply pipe union, so as to facilitate maintenance and replacement. The large-diameter screen of the interception well and the small-diameter screen of the interception well are preferably hung under the head of the interception well by wire ropes to achieve fixation. The intercepting well head is preferably equipped with a pressure gauge. The outer diameter of the large-diameter screen of the interception well is preferably 1-2 cm smaller than the inner diameter of the interception well, and the inner diameter of the small-diameter screen of the interception well is preferably 1-2 cm larger than the outer diameter of the oxygen supply pipe.

Preferably: referring to Fig. 3, the extraction equipment includes liquid phase extraction equipment and gas phase extraction equipment;

The liquid phase extraction equipment is provided with a submersible pump and a liquid level gauge for monitoring the groundwater level in the extraction well; the submersible pump is placed at the bottom of the extraction well, and the water outlet of the submersible pump is connected to one end of the submersible pump suction pipe. The other end of the suction pipe of the submersible pump protrudes out of the extraction well to extract the groundwater in the extraction well through the submersible pump; the liquid level gauge is hung under the well head of the extraction well by a wire rope Wherein, the pipe section of the submersible pump water pipe located in the extraction well is preferably equipped with a submersible pump water pipe union and a submersible pump water pipe check valve, and the pipe section of the submersible pump water pipe located outside the extraction well is preferably equipped with a submersible Pump suction pipe ball valve and submersible pump suction pipe electronic flowmeter, and the submersible pump suction pipe is preferably divided into a sampling branch equipped with a sampling branch ball valve, so as to carry out sampling analysis through the sampling branch; The head is preferably equipped with a negative pressure gauge.

The side wall of the extraction well is provided with a gas phase extraction port, and the gas phase extraction equipment adopts a vacuum pump, and the gas extraction port of the vacuum pump is connected to the gas phase extraction port of the extraction well through a vacuum pump suction pipe to pass through intermittently Run the vacuum pump to realize the extraction of free gas phase, gas produced by microbial degradation and VOCs in the soil in the extraction well. Wherein, the vacuum pump suction pipe is preferably equipped with a vacuum pump suction pipe ball valve and a vacuum pump suction pipe flow sensor.

In addition: in this second embodiment, the single-pump multiphase extraction unit described in the following embodiment three can also be used instead of the above-mentioned liquid phase extraction equipment and gas phase extraction equipment as the extraction equipment.

As a preferred embodiment of the present invention: as shown in Fig. 4 to Fig. 6, the adsorption degradation unit is fixed with the large diameter of the extraction well with the lower nozzle plugged and arranged coaxially inside each of the extraction wells. The screen tube and the small-diameter screen tube of the extraction well, the space between the large-diameter screen tube of the extraction well and the small-diameter screen tube of the extraction well is filled with the adsorption material to form an adsorption column of the extraction well, and the microorganisms are injected into the extraction well In the well adsorption column; wherein, referring to Fig. 5, the top surface of the extraction well adsorption column is preferably flush with the original liquid level when the groundwater is not extracted.

And, the spacing between two adjacent extraction wells is gradually increased from the middle position of the straight line to both ends; for example: seven extraction wells 1 shown in Figure 4, the spacing between them is from the above The bottom is 1.0m, 0.75m, 0.5m, 0.5m, 0.75m, 1.0m.

During the working period of the groundwater pollution source control system, the extraction equipment continuously extracts the groundwater in each extraction well.

Thereby, the working principle of the groundwater pollution source control system of Embodiment 3 of the present invention is:

Referring to Fig. 4 to Fig. 6, the present invention arranges the extraction wells in such a way that the spacing increases from the middle position of the straight line section to the two ends one by one, and controls the extraction equipment to continuously extract the groundwater in each extraction well, So that: the hydraulic gradient of the groundwater flowing from the upstream to the extraction well is changed, and the groundwater forms the shape of the descending funnel shown in Figure 5 and remains stable (the water level line representing the descending funnel in Figure 5), so that the groundwater Converge at the middle of all extraction wells to achieve the effect of preventing and controlling groundwater and its pollutants;

And, the present invention adopts the extraction well adsorption column respectively arranged in each extraction well as the adsorption degradation unit, so that: the groundwater pumped into the extraction well, the organic pollutants therein are absorbed by the extraction well adsorption column and Biodegradation is carried out by microorganisms to realize the preliminary restoration of groundwater, so as to reduce the concentration of pollutants in groundwater and reduce the cost and time of subsequent secondary sewage treatment of groundwater; then, the remaining pollutants are extracted to the extraction equipment along with the groundwater. Secondary sewage treatment outside the well;

Moreover, the present invention arranges the adsorption degradation unit in the extraction well, which can reduce the number of wells to be drilled, so as to reduce the implementation cost and floor area;

Wherein, the adsorption material is filled between the large-diameter screen tube of the extraction well and the small-diameter screen tube of the extraction well to form an extraction well adsorption column to form a biofilm, which can improve the adsorption capacity of the adsorption material for organic pollutants and prolong the life of the extraction well. The service life of the adsorbent material.

Preferably: referring to Figure 6, the extraction equipment adopts a single-pump multiphase extraction unit, including SVE extraction equipment, the extraction port of the SVE extraction equipment is connected to one end of the multiphase extraction pipe, and the multiphase extraction The other end of the extraction pipe penetrates into the small-diameter screen of the extraction well and extends to the bottom, so as to simultaneously realize the extraction of the liquid phase and the gas phase in the extraction well through the SVE extraction equipment. Wherein, the other end of the multiphase extraction pipe preferably has a certain distance from the bottom of the well and is wrapped with gauze for filtering sediment and impurities; the section of the multiphase extraction pipe located in the extraction well is preferably installed with a multiphase Extraction pipe union and multiphase extraction pipe one-way valve, the pipe section of the multiphase extraction pipe outside the extraction well is preferably equipped with multiphase extraction pipe ball valve, multiphase extraction pipe electronic flowmeter and transparent PVC The transparent PVC pipe is used to observe the situation of water supply; the extraction well head of the extraction well is preferably equipped with a negative pressure gauge.

As a preferred embodiment of the present invention: as shown in Figure 4 and Figure 5, the groundwater pollution source control system also includes an aeration barrier unit; the aeration barrier unit is provided with an air injection system and multiple aeration wells; the The gas injection system can realize the aeration of groundwater by injecting compressed air into each aeration well; all the aeration wells are arranged at intervals along the vertical direction of the groundwater flow and are located downstream of all the extraction wells; Wherein, the gas injection system preferably adopts an AS gas injection system.

During the working period of the groundwater pollution source control system, the gas injection system runs continuously.

Thereby, the working principle of the groundwater pollution source control system in Embodiment 4 of the present invention is:

In the present invention, an aeration barrier unit composed of an air injection system and a plurality of aeration wells is arranged at the downstream position of the extraction well, so that the compressed air injected into the groundwater by the air injection system through each aeration well forms an air flow barrier, In order to prevent the groundwater after the extraction well from continuing to flow and diffuse to the resistance control area, it can achieve the barrier effect on the remaining pollutants in the ground water, so that it can resist the upstream of the resistance control area and continue to be absorbed by the extraction unit and the adsorption degradation unit. Extraction and restoration.

In addition, for the third embodiment above, the aeration barrier unit can also provide an aerobic environment for the adsorption column of the extraction well, so as to accelerate the biodegradation rate of organic pollutants by microorganisms.

Preferably: the number of the aeration wells is one less than the number of the extraction wells, and each of the aeration wells is located 0.5m to 1m directly behind the middle of the two adjacent extraction wells , and the aeration position of the aeration well is located 0.5m to 1m below the bottom surface of the extraction well. Therefore, the barrier effect of the aeration barrier unit on pollutants can be optimized.

Compared with the prior art, the present invention has the following beneficial effects:

First, referring to Fig. 1 to Fig. 6, the present invention arranges an extraction unit and an adsorption degradation unit at the boundary position A1 of the resistance control area A close to the pollution source, so that: the groundwater W that flows through the pollution source from upstream and carries pollutants, When it flows to the resistance control area A, the organic pollutants in the groundwater W can be adsorbed by the adsorption material 2 of the adsorption degradation unit first, and the organic pollutants can be biodegraded by the microorganisms in the adsorption material 2, and then the remaining pollutants can be degraded with The groundwater W is extracted by the extraction equipment to the outside of the extraction well 1 for secondary sewage treatment; thus, the present invention can not only realize the primary pollution restoration of the groundwater W, but also physically extract the remaining pollutants to the extraction well 1, to prevent the pollution source from spreading to the containment area A;

Moreover, the implementation of the present invention is not limited by the conditions of the site where the resistance control area A is located, and there is little disturbance to the underground.

Second, referring to Fig. 1 and Fig. 2, the present invention adopts a plurality of interception wells 3 evenly spaced perpendicular to the groundwater flow direction V as the adsorption degradation unit, and forms an interception well adsorption column 2A inside each interception well 3, And the interception well 3 is arranged in the upstream position of the extraction well 1, so that: the groundwater from the upstream reaches the interception well 3 first, enters the groundwater within the adsorption influence range of each interception well 3, and the organic pollutants therein are in the corresponding interception well. Under the adsorption of the adsorption column 2A, it is adsorbed into the adsorption column 2A of the interception well, and the microorganisms in it biodegrade the organic pollutants. Therefore, each interception well 3 forms a road that can intercept and absorb organic pollutants in groundwater. The barrier adsorption wall of the discontinuous entity of adsorption and degradation treatment;

Moreover, the present invention controls the extraction equipment to intermittently extract the groundwater in the extraction well 1 by adopting a method of comparing the groundwater level, so that the organic pollutants not intercepted by the interception well 3 will flow from the interception well 3 together with the groundwater. When it flows to the extraction well 1 at intervals, the extraction equipment will pump out the groundwater through the extraction well 1 to realize the extraction of pollutants in the groundwater, so as to prevent the pollution source from diffusing into the resistance control area A; and the extraction well 1 Intermittent pumping of groundwater can control the flow direction of groundwater, so that groundwater flows through interception well 3 instead of bypassing, which helps to improve the interception efficiency of interception well 3 for organic pollutants, and can intermittently speed up the flow of groundwater. flow rate to speed up the groundwater renewal process in the control area A;

Wherein, the adsorption material 2 is formed into a biofilm by being filled between the interception well large-diameter screen 4A and the interception well small-diameter screen 5A to form an interception well adsorption column 2A, which can improve the adsorption capacity of the adsorption material 2 for organic pollutants , prolong the service life of the adsorption material 2.

Thirdly, referring to Fig. 4 to Fig. 6, the present invention arranges the extraction wells 1 in such a way that the spacing increases one by one from the middle position of the straight line segment to the two ends, and controls the extraction equipment to keep each extraction well The groundwater W in 1 is pumped out, so that: the hydraulic gradient of the groundwater W flowing from the upstream to the extraction well 1 is changed, and the groundwater W forms a descending funnel shape as shown in Fig. 5 and remains stable, so that the groundwater W flows to All the extraction wells 1 are gathered at the middle position to achieve the effect of preventing and controlling the groundwater W and the pollutants therein;

Moreover, the present invention adopts the extraction well adsorption column 2B respectively arranged in each extraction well 1 as the adsorption degradation unit, so that the organic pollutants in the groundwater W drawn into the extraction well 1 are extracted The well adsorption column 2B is adsorbed and biodegraded by microorganisms to realize the preliminary restoration of the groundwater W, to reduce the concentration of pollutants in the groundwater W, and to reduce the cost and time of subsequent secondary sewage treatment of the groundwater W; then, the remaining pollutants Then the groundwater W is extracted by the extraction equipment to the outside of the extraction well 1 for secondary sewage treatment;

Moreover, the present invention arranges the adsorption degradation unit in the extraction well 1, which can reduce the number of wells to be drilled, so as to reduce the implementation cost and floor area;

Wherein, the adsorption material 2 is formed into an extraction well adsorption column 2B by being filled between the large-diameter screen tube 4B of the extraction well and the small-diameter screen tube 5B of the extraction well to form a biofilm, which can improve the adsorption material 2 to the organic pollutants. The adsorption capacity can prolong the service life of the adsorption material 2.

Fourth, referring to Fig. 4 and Fig. 5, the present invention arranges an aeration barrier unit composed of a gas injection system and a plurality of aeration wells 12 at the downstream position of the extraction well 1, so that: the gas injection system is aerated through each port The compressed air injected into the groundwater W by the well 12 forms an airflow barrier to prevent the groundwater W passing through the extraction well 1 from continuing to flow to the control area A, so as to achieve the barrier effect on the remaining pollutants in the groundwater W, so that it can resist Upstream of the resistance control area A, it can continue to be extracted and repaired by the extraction unit and the adsorption degradation unit.

Description of drawings

Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

1 is a schematic plan view of a groundwater pollution source control system according to Embodiment 2 of the present invention;

Fig. 2 is a schematic cross-sectional structure diagram of the interception well 3 in Embodiment 2 of the present invention;

Fig. 3 is a schematic cross-sectional structure diagram of the extraction well 1 in Embodiment 2 of the present invention;

4 is a schematic plan view of a groundwater pollution source control system according to Embodiment 3 of the present invention;

5 is a schematic elevation view of a groundwater pollution source control system according to Embodiment 3 of the present invention;

Fig. 6 is a schematic cross-sectional structure diagram of the extraction well 1 in the third embodiment of the present invention.

Detailed ways

The present invention is described in detail below in conjunction with embodiment and accompanying drawing thereof, to help those skilled in the art better understand the inventive concept of the present invention, but the scope of protection of the claims of the present invention is not limited to following embodiment, to the technology of this field For those who do not deviate from the inventive concept of the present invention, all other embodiments obtained without creative work belong to the protection scope of the present invention.

Embodiment one

As shown in Figures 1 to 6, the present invention discloses a groundwater pollution source control system based on interception and adsorption, which is suitable for the situation where the resistance control area A is located in the downstream of the groundwater of the pollution source, including: an extraction unit and an adsorption degradation unit, They are all set at the boundary position A1 of the resistance and control area A close to the pollution source;

The extraction unit is provided with extraction equipment and a plurality of extraction wells 1, the extraction equipment can extract the groundwater W in each extraction well 1, each extraction well 1 is arranged at intervals along a straight line, the The straight line section is perpendicular to the groundwater flow direction V of the groundwater W; wherein, the well diameter of the extraction well 1 is screened according to the requirements and conditions, generally 110mm, and the extraction well 1 is used for external groundwater to flow into its interior. The screen opening position corresponds to the underground aquifer thickness setting.

The position of the adsorption degradation unit in the groundwater W is not located downstream of the extraction well 1, the adsorption degradation unit is provided with an adsorption material 2 capable of adsorbing organic pollutants in the groundwater W, and the adsorption material 2 is injected into There are microorganisms capable of biodegrading said organic pollutants. Among them, the selection of the adsorption material 2 should follow the principle of long life, and the best adsorption effect on common organic pollutants in groundwater such as alkanes, petroleum hydrocarbons, benzene series, halogenated hydrocarbons, and chlorinated hydrocarbons, and can be reused and easily handled. And it is harmless to the human body and does not affect the groundwater quality. Generally, activated carbon and zeolite molecular sieves are preferred. The microorganisms should be selected from the indigenous microorganisms where the resistance and control area A is located, and should follow the principles of no selectivity to the organic pollutants, easy survival underground, harmless to the human body, little impact on the underground environment, and long life.

Thereby, the operating principle of the underground water pollution source control system of the present invention is:

When the groundwater W with pollutants flowing through the pollution source from the upstream flows to the resistance control area A, the organic pollutants in the groundwater W can be adsorbed by the adsorption material 2 of the adsorption degradation unit first, and then the microorganisms in the adsorption material 2 The organic pollutants are biodegraded, and then the remaining pollutants are extracted by the extraction equipment along with the groundwater W to the outside of the extraction well 1 for secondary sewage treatment; thus, the present invention can realize the primary pollution restoration of the groundwater W, In addition, the remaining pollutants can be physically extracted to the outside of the extraction well 1, so as to prevent the pollution source from spreading to the control area A;

Moreover, the implementation of the present invention is not limited by the conditions of the site where the resistance control area A is located, and has little disturbance to the underground, and can be used as a risk control measure for pollution sources, and can also be used for soil and groundwater restoration.

Embodiment two

On the basis of the above-mentioned embodiment 1, the present embodiment 2 also adopts the following preferred implementation modes:

As shown in Figures 1 to 3, the adsorption degradation unit is provided with a plurality of interception wells 3, and all the interception wells 3 are evenly spaced perpendicular to the groundwater flow direction V, and are located upstream of the extraction well 1 ;

Referring to Fig. 2, described interception well 3 is provided with the interception well screen hole that is used for external groundwater to flow into it inside, and the screen opening position of this interception well screen hole is designed according to the position of vertically intercepting organic pollutants, and the well diameter of interception well 3 can be Select according to requirements and conditions; the interior of the interception well 3 is fixed with a lower nozzle plugged and coaxially arranged interception well large-diameter screen 4A and interception well small-diameter screen 5A, the interception large-diameter screen 4A The space between the interception well small-diameter screen pipe 5A is filled with the adsorption material 2 to form the interception well adsorption column 2A, and the microorganisms are injected into the interception well adsorption column 2A;

And, the effective range of adsorption of organic pollutants in groundwater by the interception well adsorption column 2A in the interception well 3 is defined as the adsorption influence range, which is a cylindrical range coaxial with the interception well adsorption column 2A, and two adjacent The adsorption influence range of the interception well 3 partially overlaps;

During the work of the groundwater pollution source control system, the extraction equipment controls whether to extract the groundwater in the corresponding extraction well 1 according to the groundwater level in each extraction well 1, that is, the groundwater in any extraction well 1 When the water level rises to the preset upper limit water level, the extraction equipment will extract the groundwater in this extraction well 1; when the groundwater level in any one extraction well 1 drops to the preset lower limit water level, the described The extraction equipment stops pumping water to this extraction well 1 .

Thereby, the working principle of the groundwater pollution source control system of Embodiment 2 of the present invention is:

Referring to Fig. 1 and Fig. 2, the present invention adopts a plurality of interception wells 3 evenly spaced perpendicular to the groundwater flow direction V as the adsorption degradation unit, and forms an interception well adsorption column 2A inside each interception well 3, and intercepts The well 3 is arranged at the upstream position of the extraction well 1, so that: the groundwater from the upstream first reaches the interception well 3, enters the groundwater within the adsorption influence range of each interception well 3, and the organic pollutants therein are absorbed in the adsorption column 2A of the corresponding interception well. Under the action of adsorption, it is adsorbed into the adsorption column 2A of the interception well, and the microorganisms in it biodegrade the organic pollutants. Therefore, each interception well 3 forms a road that can intercept, adsorb and degrade organic pollutants in groundwater. Barrier snap walls for discontinuous solids to handle;

Moreover, the present invention controls the extraction equipment to intermittently extract the groundwater in the extraction well 1 by adopting a method of comparing the groundwater level, so that the organic pollutants not intercepted by the interception well 3 will flow from the interception well 3 together with the groundwater. When it flows to the extraction well 1 at intervals, the extraction equipment will pump out the groundwater through the extraction well 1 to realize the extraction of pollutants in the groundwater, so as to prevent the pollution source from diffusing into the resistance control area A; and the extraction well 1 Intermittent pumping of groundwater can control the flow direction of groundwater, so that groundwater flows through interception well 3 instead of bypassing, which helps to improve the interception efficiency of interception well 3 for organic pollutants, and can intermittently speed up the flow of groundwater. flow rate to speed up the groundwater renewal process in the control area A;

Wherein, the adsorption material 2 is formed into a biofilm by being filled between the interception well large-diameter screen 4A and the interception well small-diameter screen 5A to form an interception well adsorption column 2A, which can improve the adsorption capacity of the adsorption material 2 for organic pollutants , prolong the service life of the adsorption material 2.

The above is the basic implementation mode of the second embodiment, further optimization, improvement and limitation can be done on the basis of the basic implementation mode:

Preferably: referring to Fig. 1, the number of the extraction wells 1 is one less than the number of the interception wells 3, and each of the extraction wells 1 is located in the middle of the two adjacent interception wells 3. 0.5m to 1m behind. Therefore, each extraction well 1 is located at the weakest position where the barrier adsorption wall formed by each interception well 3 has the worst interception effect on organic pollutants, so as to achieve the optimal extraction effect of the extraction well 1 on groundwater pollutants .

Preferably: referring to FIG. 2 , the groundwater pollution source control system is also provided with an oxygen supply system, and the oxygen supply pipe 6 of the oxygen supply system penetrates into the lumen of the small-diameter screen pipe 5A of the interception well and extends to the bottom position. Therefore, the oxygen supply system continuously performs aeration at a proper pressure to provide an aerobic environment for the adsorption column 2A of the interception well, so as to accelerate the biodegradation rate of organic pollutants by microorganisms.

Wherein, the pipe section of the oxygen supply pipe 6 located in the interception well 3 is preferably equipped with an oxygen supply pipe union 6-1, so as to facilitate maintenance and replacement. The large-diameter screen 4A of the interception well and the small-diameter screen 5A of the interception well are preferably hung under the well head 3-1 of the interception well 3 by wire ropes, so as to be fixed. The intercepting well head 3-1 is preferably equipped with a pressure gauge. The outer diameter of the large-diameter screen pipe 4A of the interception well is preferably 1-2 cm smaller than the inner diameter of the interception well 3, and the inner diameter of the small-diameter screen pipe 5A of the interception well is preferably 1-2 cm larger than the outer diameter of the oxygen supply pipe 6. 2cm.

Preferably: referring to Fig. 3, the extraction equipment includes liquid phase extraction equipment and gas phase extraction equipment;

The liquid phase extraction equipment is provided with a submersible pump 7 and a liquid level gauge 8 for monitoring the groundwater level in the extraction well 1; the submersible pump 7 is placed at the bottom of the extraction well 1, and the outlet of the submersible pump 7 is connected One end of the submersible pump water pipe 9, and the other end of the submersible pump water pipe 9 extends out of the extraction well 1, so as to realize the extraction of groundwater in the extraction well 1 through the submersible pump 7; Hanging under the wellhead 1-1 of the extraction well 1 of the extraction well 1; wherein, the pipe section of the submersible pump suction pipe 9 located in the extraction well 1 is preferably equipped with a submersible pump suction pipe union 9-1 and a submersible Pump suction pipe check valve 9-2, the submersible pump suction pipe 9 is preferably installed with a submersible pump suction pipe ball valve 9-3 and a submersible pump suction pipe electronic flowmeter 9-4 in the pipe section outside the extraction well 1, and the The submersible pump suction pipe 9 is preferably divided into a sampling branch equipped with a sampling branch ball valve 9-5, so as to carry out sampling analysis through the sampling branch; the extraction well head 1-1 is preferably equipped with a negative pressure gauge.

The side wall of the extraction well 1 is provided with a gas phase extraction port 1-2, and the gas phase extraction equipment adopts a vacuum pump, and the gas extraction port of the vacuum pump is connected to the gas phase extraction of the extraction well 1 through a vacuum pump suction pipe 10. Port 1-2, to realize the extraction of the free gas phase, gas produced by microbial degradation and VOCs in the soil in the extraction well 1 by intermittently operating the vacuum pump. Wherein, the vacuum pump suction pipe 10 is preferably equipped with a vacuum pump suction pipe ball valve 10-1 and a vacuum pump suction pipe flow sensor 10-2.

In addition: in this second embodiment, the single-pump multiphase extraction unit described in the following embodiment three can also be used instead of the above-mentioned liquid phase extraction equipment and gas phase extraction equipment as the extraction equipment.

Embodiment three

On the basis of the above-mentioned embodiment 1, the present embodiment 3 also adopts the following preferred implementation modes:

As shown in Figures 4 to 6, the adsorption degradation unit is fixed inside each extraction well 1 with a large-diameter extraction well screen 4B and an extraction well with the lower nozzle plugged and arranged coaxially. The small-diameter screen 5B, the space between the extraction well large-diameter screen 4B and the extraction well small-diameter screen 5B is filled with the adsorption material 2 to form the extraction well adsorption column 2B, and the microorganisms are injected into the extraction well In the adsorption column 2B; wherein, referring to FIG. 5 , the top surface of the extraction well adsorption column 2B is preferably flush with the original liquid level of the groundwater W when it is not extracted.

And, the spacing between two adjacent extraction wells 1 is gradually increased from the middle position of the straight line to the two ends; for example: seven extraction wells 1 shown in Fig. 4, the spacing between them is by From top to bottom are 1.0m, 0.75m, 0.5m, 0.5m, 0.75m, 1.0m.

During the working period of the groundwater pollution source control system, the extraction equipment continuously extracts the groundwater W in each extraction well 1 .

Thereby, the working principle of the groundwater pollution source control system of Embodiment 3 of the present invention is:

Referring to Fig. 4 to Fig. 6, the present invention arranges the extraction wells 1 in such a way that the spacing increases one by one from the middle position of the straight line segment to the two ends, and controls the extraction equipment to keep extracting wells 1 in each extraction well 1 The groundwater W is pumped out, so that: the hydraulic gradient of the groundwater W flowing from the upstream to the extraction well 1 is changed, and the groundwater W forms the shape of the descending funnel shown in Figure 5 and remains stable (W1 in Figure 5 represents the descending funnel water level), so that the groundwater W gathers at the middle position of all extraction wells 1, so as to achieve the effect of preventing and controlling the groundwater W and the pollutants therein;

Moreover, the present invention adopts the extraction well adsorption column 2B respectively arranged in each extraction well 1 as the adsorption degradation unit, so that the organic pollutants in the groundwater W drawn into the extraction well 1 are extracted The well adsorption column 2B is adsorbed and biodegraded by microorganisms to realize the preliminary restoration of the groundwater W, to reduce the concentration of pollutants in the groundwater W, and to reduce the cost and time of subsequent secondary sewage treatment of the groundwater W; then, the remaining pollutants Then the groundwater W is extracted by the extraction equipment to the outside of the extraction well 1 for secondary sewage treatment;

Moreover, the present invention arranges the adsorption degradation unit in the extraction well 1, which can reduce the number of wells to be drilled, so as to reduce the implementation cost and floor space;

Wherein, the adsorption material 2 is formed into an extraction well adsorption column 2B by being filled between the large-diameter screen tube 4B of the extraction well and the small-diameter screen tube 5B of the extraction well to form a biofilm, which can improve the adsorption material 2 to the organic pollutants. The adsorption capacity can prolong the service life of the adsorption material 2.

The above is the basic implementation of the third embodiment, further optimization, improvement and limitation can be done on the basis of the basic implementation:

Preferably: referring to FIG. 6, the extraction equipment adopts a single-pump multiphase extraction unit, including SVE extraction equipment, the extraction port of the SVE extraction equipment is connected to one end of the multiphase extraction pipe 11, and the multiphase The other end of the extraction pipe 11 penetrates into the small-diameter screen pipe 5B of the extraction well and extends to the bottom, so as to realize the extraction of the liquid phase and the gas phase in the extraction well 1 at the same time through the SVE extraction equipment. Wherein, the other end of the multi-phase extraction pipe 11 preferably has a certain distance from the bottom of the well and is wrapped with gauze for filtering sediment and impurities; the pipe section of the multi-phase extraction pipe 11 located in the extraction well 1 is preferably A multiphase extraction pipe union 11-1 and a multiphase extraction pipe check valve 11-2 are installed, and the pipe section of the multiphase extraction pipe 11 located outside the extraction well 1 is preferably equipped with a multiphase extraction pipe ball valve 11-3, multi-phase extraction tube electronic flowmeter 11-4 and transparent PVC tube 11-5, the transparent PVC tube 11-5 is used to observe the situation of water supply; the extraction well head of the extraction well 1- 1 preferably installed with a negative pressure gauge.

Embodiment four

On the basis of any one of the above-mentioned Embodiments 1 to 3, this Embodiment 4 also adopts the following preferred implementation modes:

As shown in Figures 4 and 5, the groundwater pollution source control system also includes an aeration barrier unit; the aeration barrier unit is provided with an air injection system and a plurality of aeration wells 12; the gas injection system can pass to each One aeration well 12 injects compressed air to realize the aeration of the groundwater W; all the aeration wells 12 are arranged at intervals along the vertical direction of the groundwater flow direction V and are located downstream of all the extraction wells 1; wherein, The gas injection system preferably adopts an AS gas injection system.

During the working period of the groundwater pollution source control system, the gas injection system runs continuously.

Thereby, the working principle of the groundwater pollution source control system in Embodiment 4 of the present invention is:

In the present invention, an aeration barrier unit composed of an air injection system and a plurality of aeration wells 12 is arranged at the downstream position of the extraction well 1, so that: the air injection system injects compressed air into the groundwater W through each aeration well 12 to form An airflow barrier to prevent the groundwater W passing through the extraction well 1 from continuing to flow and diffuse to the control area A, so as to achieve the effect of blocking the remaining pollutants in the groundwater W, so that it can resist the upstream of the control area A and continue to flow. It is extracted and repaired by the extraction unit and the adsorption degradation unit.

In addition, for the third embodiment above, the aeration barrier unit can also provide an aerobic environment for the adsorption column 2B of the extraction well, so as to accelerate the biodegradation rate of organic pollutants by microorganisms.

The above is the basic implementation of the fourth embodiment, further optimization, improvement and limitation can be done on the basis of the basic implementation:

Preferably: the number of the aeration wells 12 is one less than the number of the extraction wells 1, and each of the aeration wells 12 is located directly behind the middle position of two adjacent extraction wells 1. m to 1m, and the aeration position 12a of the aeration well 12 is located 0.5m to 1m below the bottom surface of the extraction well 1 . Therefore, the barrier effect of the aeration barrier unit on pollutants can be optimized.

The present invention is not limited to the above-mentioned specific implementation methods. According to the above-mentioned content, according to the common technical knowledge and conventional means in this field, without departing from the above-mentioned basic technical idea of the present invention, the present invention can also make other equivalent forms. Amendments, substitutions or alterations all fall within the protection scope of the present invention.

Claims (9)

1. A groundwater pollution source control system based on interception and adsorption, suitable for the situation where the resistance control area (A) is located at the groundwater downstream position of the pollution source, it is characterized in that, comprising: an extraction unit and an adsorption degradation unit, all arranged on the said resistance The boundary position (A1) of the control area (A) close to the pollution source; The extraction unit is provided with extraction equipment and a plurality of extraction wells (1), and the extraction equipment can extract groundwater (W) in each extraction well (1), and each extraction well (1 ) are arranged at intervals along a straight line segment perpendicular to the groundwater flow direction (V) of said groundwater (W); The position of the adsorption degradation unit in the groundwater (W) is not located downstream of the extraction well (1), and the adsorption degradation unit is provided with an adsorption material (2) capable of adsorbing organic pollutants in the groundwater (W) , and the adsorption material (2) is injected with microorganisms capable of biodegrading the organic pollutants. 2. The groundwater pollution source control system based on interception and adsorption according to claim 1, characterized in that: the adsorption degradation unit is provided with multiple interception wells (3), and all of the interception wells (3) are perpendicular to the groundwater flow direction (V) uniformly spaced and located upstream of the extraction well (1); The interception well (3) is provided with an interception well screen hole for external groundwater to flow into its interior; the interior of the interception well (3) is fixed with a large-diameter screen pipe (4A ) and the small-diameter screen of the interception well (5A), the space between the large-diameter screen of the interception well (4A) and the small-diameter screen of the interception well (5A) is filled with the adsorption material (2) to form the adsorption column of the interception well ( 2A), the microorganisms are injected into the interception well adsorption column (2A); And, the effective range of the adsorption column (2A) in the interception well (3) to adsorb organic pollutants in groundwater is defined as the adsorption influence range, and the adsorption influence ranges of two adjacent interception wells (3) partially overlap; During the work of the groundwater pollution source control system, the extraction equipment controls whether to extract the groundwater in the corresponding extraction well (1) according to the groundwater level in each extraction well (1), that is: in any extraction well When the groundwater level in (1) rose to the preset upper limit water level, the extraction equipment extracted the groundwater in this extraction well (1); the groundwater level in any one extraction well (1) decreased When the preset lower limit water level is reached, the extraction equipment stops pumping water to this extraction well (1). 3. The groundwater pollution source control system based on interception and adsorption according to claim 2, characterized in that: the quantity of the extraction wells (1) is one less than the quantity of the interception wells (3), and each of the extraction wells (1) The lifting wells (1) are all located 0.5m to 1m directly behind the middle of the two adjacent intercepting wells (3). 4. The groundwater pollution source control system based on interception and adsorption according to claim 2, characterized in that: the groundwater pollution source control system is also provided with an oxygen supply system, and the oxygen supply pipe (6) of the oxygen supply system penetrates into the Intercept the lumen of the small-diameter screen (5A) in the interception well and extend to the bottom position. 5. The groundwater pollution source control system based on interception and adsorption according to claim 2, characterized in that: said extraction equipment comprises liquid phase extraction equipment and gas phase extraction equipment; The liquid phase extraction equipment is provided with a submersible pump (7) and a liquid level gauge (8) for monitoring the groundwater level in the extraction well (1); the submersible pump (7) is placed in the extraction well (1) the bottom of the submersible pump (7), the outlet of the submersible pump (7) is connected to one end of the submersible pump water pipe (9), and the other end of the submersible pump water pipe (9) stretches out to the outside of the extraction well (1); the liquid level gauge (8 ) is hung under the extraction well head (1-1) of the extraction well (1) by a wire rope; The side wall of the extraction well (1) is provided with a gas phase extraction port (1-2), the gas phase extraction equipment adopts a vacuum pump, and the gas extraction port of the vacuum pump is connected to the extraction port through a vacuum pump suction pipe (10). The gas phase extraction port (1-2) of the well (1). 6. The groundwater pollution source control system based on interception and adsorption according to claim 1, characterized in that: the adsorption degradation unit is fixed with a lower nozzle plugging and coaxial in each of the extraction wells (1). The large-diameter screen of the extraction well (4B) and the small-diameter screen of the extraction well (5B), the space between the large-diameter screen of the extraction well (4B) and the small-diameter screen of the extraction well (5B) Filling the adsorption material (2) to form an extraction well adsorption column (2B), and the microorganisms are injected into the extraction well adsorption column (2B); In addition, the distance between two adjacent extraction wells (1) is gradually increased from the middle position of the straight line section to the two ends; During the working period of the groundwater pollution source control system, the extraction equipment continuously extracts the groundwater (W) in each extraction well (1). 7. The groundwater pollution source control system based on interception and adsorption according to claim 6, characterized in that: the extraction equipment adopts a single-pump multiphase extraction unit, including SVE extraction equipment, the extraction port of the SVE extraction equipment One end of the multiphase extraction pipe (11) is connected, and the other end of the multiphase extraction pipe (11) penetrates into the small-diameter screen pipe (5B) of the extraction well and extends to the bottom. 8. The groundwater pollution source control system based on interception and adsorption according to any one of claims 1 to 7, characterized in that: the groundwater pollution source control system also includes an aeration barrier unit; the aeration barrier unit is provided with an air injection system and a plurality of aeration wells (12); the gas injection system can realize the aeration of groundwater (W) by injecting compressed air into each aeration well (12); all of the aeration wells (12) along the The vertical direction of the groundwater flow direction (V) is arranged at intervals and is located at the downstream position of all the extraction wells (1); During the working period of the groundwater pollution source control system, the gas injection system runs continuously. 9. The groundwater pollution source control system based on interception and adsorption according to claim 8, characterized in that: the number of said aeration wells (12) is one less than the number of said extraction wells (1), and each said The aeration wells (12) are located 0.5m to 1m directly behind the middle positions of two adjacent extraction wells (1), and the aeration positions (12a) of the aeration wells (12) are located in the 0.5m to 1m below the bottom surface of the extraction well (1).

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