In-well treatment apparatus and method for LNAPL-contaminated groundwater remediation

Abstract

The application discloses an in-well treatment device and method for LNAPL contaminated groundwater remediation, and the treatment device comprises a power supply module unit, which is positioned and hung on the edge of a well mouth; a reaction module unit, which is arranged in the well; the reaction module unit comprises a reaction module shell and a reaction inner container, the side of the reaction module shell is a groundwater inlet, the reaction inner container is arranged in the reaction module shell, and the bottom of the reaction inner container is an ultrafiltration membrane assembly; and a driving module unit, which is arranged below the reaction module unit. The treatment device is installed in the well space, and when running, a vortex is formed below the treatment device, and then the LNAPL pollutants floating on the surface of the groundwater are introduced into the reaction inner container from the side of the reaction module shell, and the water molecules of the LNAPL pollutants removed by the reaction inner container are reflowed into the well, so that the pump and the ground treatment system are not needed, and the defects of high energy consumption and large disturbance of the traditional extraction treatment technology are effectively avoided.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to an in-well treatment device and method for the remediation of LNAPL-contaminated groundwater. Background Technology

[0002] This section provides only background information relevant to this disclosure and does not necessarily constitute prior art.

[0003] Light non-aqueous liquids (LNAPLs) are a class of pollutants, most of which are carcinogenic, teratogenic, and mutagenic. Common examples include petroleum, kerosene, and paraxylene. They are less dense than water, non-soluble, and easily penetrate and migrate to the groundwater surface, accumulating thereafter. Furthermore, they are not easily decomposed in a short time, significantly increasing the difficulty and cost of groundwater remediation and posing a serious threat to soil, groundwater environment, and human health.

[0004] With my country's sustained economic growth, continuous improvement in industrialization, and rapid urbanization, key pollution sources, mainly high-pollution industries such as petrochemicals, often cause LNAPL to leak into the soil and groundwater environment and cause pollution during production, storage, and transportation due to emergency accidents or improper handling.

[0005] Extraction treatment technology is a widely used groundwater LNAPL contamination remediation technology. This technology involves deploying pumping wells at specific locations based on the extent of groundwater contamination, and using pumping facilities to extract contaminated groundwater from the aquifer to the surface for treatment. Current emerging technologies often improve upon this by using precision extraction or combining it with remediation techniques such as vertical barrier walls. While these technologies can effectively control the contamination plume within the capture zone, reduce its spread, and rapidly remove most pollutants, they still suffer from drawbacks such as high power consumption, high equipment operation and maintenance costs, and significant disturbance to the groundwater in the remediation area caused by extraction and reinjection. Therefore, there is an urgent need for a remediation device and method that is energy-efficient, less disruptive, and more cost-effective. Summary of the Invention

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the shortcomings of existing extraction and treatment technologies, which require pumping facilities to extract contaminated groundwater from the aquifer to the surface for treatment, resulting in high energy consumption and significant interference with groundwater in the remediation area. Thus, the present invention provides an in-well treatment device and method for the remediation of LNAPL contaminated groundwater.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] An in-well treatment device for the remediation of LNAPL-contaminated groundwater includes:

[0009] The power supply module unit is positioned and suspended on the edge of the wellhead, and is used to supply power to the entire device;

[0010] The reaction module unit is connected below the power supply module unit and is installed inside the well; the reaction module unit includes a reaction module shell and a reaction tank for removing LNAPL contaminants from groundwater. The side of the reaction module shell is a groundwater inlet, and the reaction tank is installed inside the reaction module shell. The bottom of the reaction tank is an ultrafiltration membrane assembly for allowing water molecules to pass through and retaining LNAPL contaminants.

[0011] The drive module unit, located below the reaction module unit, is used to drive the groundwater to form a vortex, so as to introduce LNAPL pollutants floating on the groundwater surface into the reaction module unit.

[0012] The technical solution is further optimized, and the reaction liner includes:

[0013] A grid is used to filter large particulate impurities in groundwater; the grid is internally equipped with an adsorption material component and / or a solid microbial degradation material component, wherein the adsorption material component is used to adsorb LNAPL pollutants, and the solid microbial degradation material component is used to efficiently degrade LNAPL pollutants.

[0014] To further optimize the technical solution, the adsorption material component is a porous adsorption material component, which is an organic polymer fiber or gel type and a highly oil-absorbing resin or sponge.

[0015] To further optimize the technical solution, the solid microbial degradation material component has microbial strains with high LNAPL degradation capabilities and biomass materials to support the growth of microbial strains and promote their survival activity. The microbial strains are attached to or wrapped on the solid support material to form a biodegradation array.

[0016] The technical solution is further optimized by mounting the adsorption material component and / or the solid microbial degradation material component on the grid through a fixed cover and rotating clamping.

[0017] and / or

[0018] The reaction liner is rotated and snapped into place with the reaction module shell.

[0019] The technical solution is further optimized, and the power supply module unit includes:

[0020] The fixing plate is positioned and suspended on the edge of the wellhead;

[0021] The power supply module housing is connected to the bottom of the fixing plate and is also connected to the reaction module housing;

[0022] Solar photovoltaic panels, installed on the outer surface of a fixed panel, are used to convert sunlight into electrical energy;

[0023] Storage batteries are used to store the electrical energy generated by solar photovoltaic panels.

[0024] To further optimize the technical solution, the driving module unit includes:

[0025] The drive module housing is connected to the bottom of the reaction module unit and forms a cavity structure with an opening at the bottom with the bottom of the reaction module unit;

[0026] The drive module, which has propeller blades and is located inside the cavity structure, is used to drive the groundwater to rotate and form a vortex.

[0027] The control box, located inside the drive module housing, is used to coordinate the operation of the power supply module unit and the drive module.

[0028] Further optimization of the technical solution also includes:

[0029] Water quality monitoring device for real-time monitoring of LNAPL concentration in groundwater;

[0030] An automatic dosing device includes a control system and a dosing device. The dosing port of the dosing device is located inside the reaction module unit, and the control system is located on the ground surface. The water quality monitoring device monitors the LNAPL concentration in groundwater in real time and determines whether the LNAPL concentration exceeds a threshold. When the LNAPL concentration exceeds the threshold, the device transmits a signal to the control system, which then controls the dosing device to administer the dosing.

[0031] An in-well treatment method for remediation of LNAPL-contaminated groundwater includes the following steps:

[0032] The in-well treatment device for LNAPL contaminated groundwater remediation is installed inside the well;

[0033] By driving the groundwater to form a vortex through the drive module unit, LNAPL pollutants floating on the groundwater surface are introduced into the reaction module unit from the side of the reaction module unit.

[0034] The LNAPL contaminants in the groundwater are removed by the reaction module unit, and the LNAPL contaminants are retained by the ultrafiltration membrane module, allowing the treated water molecules to flow back into the well, thus completing the groundwater remediation.

[0035] Further optimization of the technical solution also includes the following steps:

[0036] The module units can be flexibly selected and replaced according to the characteristics of LNAPL: for volatile LNAPL, a heating ring can be installed to improve the volatilization efficiency of LNAPL by heating the LNAPL; and / or for low-concentration LNAPL, either an adsorption material component or a solid microbial degradation material component can be installed; and / or the material of the adsorption material component or the solid microbial degradation material component can be changed based on the different properties of LNAPL in different application scenarios.

[0037] and / or

[0038] The module units can be flexibly selected and replaced according to the wear and tear: when the adsorption material component and / or solid microbial degradation material component reach the adsorption and / or degradation saturation state, only the adsorption material component and / or solid microbial degradation material component are replaced.

[0039] and / or

[0040] The module units can be flexibly selected and replaced according to the repair requirements: for application scenarios with high repair requirements, the adsorption material component and the solid microbial degradation material component can be used in combination; and / or for application scenarios with low repair requirements, only a single adsorption material component or solid microbial degradation material component can be selected.

[0041] The technical solution of this invention has the following advantages:

[0042] 1. This invention provides an in-well treatment device for the remediation of LNAPL-contaminated groundwater. It fully utilizes the space within the well to install the treatment device. During operation, a vortex is formed below the treatment device, drawing LNAPL contaminants floating on the groundwater surface from the side of the reaction module shell into the reaction tank. Water molecules that have had LNAPL contaminants removed in the reaction tank are then returned to the well, thus achieving effective removal of LNAPL contaminants within the well. This eliminates the need for pumping and surface treatment systems, effectively avoiding the drawbacks of traditional extraction treatment technologies, such as high energy consumption and significant disturbance. This invention offers advantages such as simple operation, low maintenance costs, space saving, and minimal environmental disturbance.

[0043] 2. This invention provides an in-well treatment device for the remediation of LNAPL-contaminated groundwater. The adsorption material component is a porous adsorption material component, and the oil-absorbing material with the best adsorption effect can be selected according to the type of LNAPL, such as organic polymer fibers, gel-type and highly oil-absorbing resins or sponges. This component has properties such as high porosity and highly interconnected pore structure, and has a significant adsorption capacity for different LNAPLs. It can reach the maximum adsorption capacity in a short time, and the adsorption capacity does not decrease significantly after several cycles, which can effectively separate oil-water mixtures.

[0044] 3. This invention provides an in-well treatment device for the remediation of LNAPL-contaminated groundwater. The solid microbial degradation material component can target specific microbial degradation materials according to the type of LNAPL, achieving targeted and efficient degradation of LNAPL. The solid microbial degradation material component contains microbial strains with a high capacity for LNAPL degradation and biomass materials to support the growth and promote the survival of these microbial strains. The microbial strains attach to or encapsulate on the solid support material, forming a biodegradation array. In practical applications, microorganisms grow on the surface of the solid support material and convert organic compounds in LNAPL into harmless products such as water and carbon dioxide through metabolic activities. The solid support material provides a platform to protect microorganisms from adverse external environmental influences and promotes their survival in LNAPL-contaminated areas, thereby achieving efficient and sustained degradation of LNAPL.

[0045] 4. The present invention provides an in-well treatment device for the remediation of LNAPL-contaminated groundwater. It removes LNAPL pollutants from groundwater through a combination of multiple technologies such as adsorption, microbial degradation, and membrane filtration. Compared with the prior art, the present invention has a wider range of applications, can remove a more comprehensive range of LNAPL types, and has a higher remediation efficiency.

[0046] 5. This invention provides an in-well treatment device for the remediation of LNAPL-contaminated groundwater. The power supply module unit can be directly connected to a power source to power the entire treatment device. Alternatively, the power supply module unit can convert solar radiation into electrical energy through the semiconductor photovoltaic effect of solar photovoltaic panels, solving the problem of difficult energy supply in the field and providing a wider range of application scenarios for this device. This invention utilizes environmentally friendly and clean energy—solar energy—to convert solar radiation into electrical energy through the semiconductor photovoltaic effect of solar photovoltaic panels, thereby driving the device's operation and further reducing energy consumption. In areas with sufficient sunlight, no other energy source is required.

[0047] 6. This invention provides an in-well treatment device for the remediation of LNAPL-contaminated groundwater, which can be placed in various types of existing or newly built wells, such as groundwater environmental monitoring wells, water intake wells, and circulation wells. For existing wells that meet the usage requirements, this device can be directly installed and operated without the need for constructing new wells, greatly reducing engineering costs.

[0048] 7. The present invention provides an in-well treatment device for the remediation of LNAPL-contaminated groundwater, wherein each module unit and its components are connected by snap-fit ​​or spiral structure, which is compact and easy to operate.

[0049] 8. The present invention provides an in-well treatment device for the remediation of LNAPL-contaminated groundwater. The water quality monitoring device enables real-time monitoring and transmission of groundwater quality without the need for manual monitoring. Through the linkage of the sensor controller and various control devices, it achieves fully automated operation and can perform precise control, which greatly improves the flexibility and scalability of the process and reduces the cost of use.

[0050] 9. The present invention provides an in-well treatment method for the remediation of LNAPL-contaminated groundwater, which allows for flexible selection and replacement of various module units and their components based on LNAPL characteristics, wear and tear, and remediation requirements. Attached Figure Description

[0051] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0052] Figure 1 This is an exploded view of an in-well treatment device for the remediation of LNAPL-contaminated groundwater according to the present invention.

[0053] Figure 2 This is a schematic diagram of the structure of an in-well treatment device for the remediation of LNAPL-contaminated groundwater according to the present invention.

[0054] Figure 3 This is a partial cross-sectional view of an in-well treatment device for the remediation of LNAPL-contaminated groundwater according to the present invention.

[0055] Figure 4 This is a partial structural schematic diagram of an in-well treatment device for the remediation of LNAPL-contaminated groundwater according to the present invention.

[0056] Figure label:

[0057] 1. Power supply module unit, 1a. Solar photovoltaic panel, 1b. Fixing plate, 1c. Battery, 1d. Power supply module housing;

[0058] 2. Reaction liner, 2a. Fixed cover, 2b. Solid microbial degradation material assembly, 2c. Adsorption material assembly, 2d. Grid, 2e. Ultrafiltration membrane assembly;

[0059] 3. Reaction module unit, 3a. Helical structure, 3b. Support frame, 3c. Reaction module shell, 3d. Observation window;

[0060] 4. Drive module unit; 4a. Drive module housing; 4b. Propeller blade; 4c. Control box; 4d. Support net.

[0061] 5. Sensing elements;

[0062] 6. Dosing device;

[0063] 7. Signal processing system;

[0064] 8. Control system. Detailed Implementation

[0065] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0066] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0067] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0068] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0069] Example 1

[0070] like Figures 1 to 4 A specific embodiment of an in-well treatment device for the remediation of LNAPL-contaminated groundwater is shown, comprising a power supply module unit 1, a reaction module unit 3, and a drive module unit 4.

[0071] The power supply module unit 1 is positioned and suspended on the edge of the wellhead to provide power to the drive module unit 4. It can also be directly connected to a power source when conditions permit.

[0072] The reaction module unit 3 is connected below the power supply module unit 1 and is installed inside the well. The reaction module unit 3 includes a reaction module shell 3c and a reaction tank 2 for removing LNAPL contaminants from groundwater. The side of the reaction module shell 3c is the groundwater inlet, and the reaction tank 2 is installed inside the reaction module shell 3c. The bottom of the reaction tank 2 is an ultrafiltration membrane assembly 2e, which is used to trap LNAPL contaminants and surfactants while allowing water molecules to pass through, achieving oil-water separation. The remediated groundwater flows back into the well through the bottom of the device.

[0073] The drive module unit 4 is located below the reaction module unit 3 and is used to drive the groundwater to form a vortex so as to introduce the LNAPL pollutants floating on the groundwater surface into the reaction module unit 3.

[0074] The above-mentioned in-well treatment device for LNAPL-contaminated groundwater remediation makes full use of the space inside the well to install the treatment device. During operation, a vortex is formed below the treatment device, which introduces LNAPL pollutants floating on the groundwater surface from the side of the reaction module shell 3c into the reaction tank 2. The water molecules that have been decontaminated by LNAPL pollutants in the reaction tank 2 are returned to the well, thereby achieving effective removal of LNAPL pollutants inside the well. It does not require pumping or a surface treatment system, effectively avoiding the drawbacks of high energy consumption and large disturbance of traditional extraction treatment technology.

[0075] It should be noted that the well can be any type of existing or newly built well, such as a groundwater environmental monitoring well, water intake well, or circulation well (Φ > 200mm, where Φ is the inner diameter). For existing wells that meet the usage requirements, this device can be directly installed and operated without the need to build a new well, greatly reducing engineering costs.

[0076] In some embodiments, the groundwater inlet on the side wall of the reaction module housing 3c is a strip-shaped hole. Groundwater enters the reaction inner liner 2 through the strip-shaped hole of the reaction module housing 3c. The strip-shaped hole can block large-diameter gravel.

[0077] In some embodiments, an observation window 3d is provided on the outer shell 3c of the reaction module. The observation window 3d is used to observe the physical properties of the reaction liner, so as to determine whether the internal material of the reaction liner needs to be replaced.

[0078] In some embodiments, the bottom of the reaction module housing 3c is a support frame 3b, which is used to support and fix the reaction inner liner 2.

[0079] In some embodiments, the reaction chamber 2 includes a grid 2d with a plurality of grid holes for filtering large particulate impurities such as gravel and silt from groundwater; that is, large particulate impurities such as gravel and silt are intercepted by the grid 2d. The grid 2d contains an adsorption material component 2c and / or a solid microbial degradation material component 2b. The adsorption material component 2c adsorbs LNAPL pollutants, and the solid microbial degradation material component 2b efficiently degrades LNAPL pollutants. In this embodiment, the adsorption material component 2c and the solid microbial degradation material component 2b can be selectively provided; either the adsorption material component 2c or the solid microbial degradation material component 2b can be provided alone inside the grid 2d, or both can be provided simultaneously inside the grid 2d. When the adsorption material component 2c and the solid microbial degradation material component 2b are simultaneously disposed inside the grid 2d, the solid microbial degradation material component 2b is located inside the adsorption material component 2c, and the grid 2d, the adsorption material component 2c and the solid microbial degradation material component 2b form an outer ring, a middle ring and an inner ring from the outside to the inside.

[0080] In some embodiments, the adsorbent material component 2c is a porous adsorbent material component. The oil-absorbing material with the best adsorption effect can be selected according to the type of LNAPL, such as organic polymer fibers, gel-type and highly absorbent resins or sponges. This component has properties such as high porosity and highly interconnected pore structure, exhibiting significant adsorption capacity for different LNAPLs. It can reach its maximum adsorption capacity in a short time, and its adsorption capacity does not decrease significantly after several cycles, enabling effective separation of oil-water mixtures.

[0081] In some embodiments, the solid microbial degradable material component 2b specifically degrades LNAPL, achieving highly efficient degradation of LNAPL. The solid microbial degradable material component 2b can target and select microbial degradable materials according to the type of LNAPL, thus playing a targeted and efficient role in degrading LNAPL. The solid microbial degradable material component 2b has microbial strains with a high ability to degrade LNAPL and biomass materials to support the growth of microbial strains and promote their survival activity. The microbial strains are attached to or encapsulated on the solid support material, forming a biodegradable array. In practical applications, microorganisms grow on the surface of the solid support material and convert the organic compounds in LNAPL into harmless products such as water and carbon dioxide through metabolic activities. The solid support material provides a platform to protect microorganisms from adverse external environmental influences and promotes their survival activity in LNAPL-contaminated areas, thereby achieving efficient and sustained degradation of LNAPL.

[0082] In some embodiments, the adsorbent material component 2c and / or the solid microbial degradation material component 2b are rotatably fastened to the grid 2d via a fixing cover 2a. In this embodiment, the fixing cover 2a is provided with a rotating buckle structure, and the fixing cover 2a is an annular structure with a first buckle protrusion at the inner ring. The top ends of the adsorbent material component 2c, the solid microbial degradation material component 2b, and the grid 2d are respectively provided with first buckle recesses. When the first buckle protrusion contacts the first buckle recess and the first buckle protrusion is rotated, a locking mechanism is achieved between the first buckle protrusion and the first buckle recess.

[0083] When both the adsorbent material component 2c and the solid microbial degradation material component 2b are rotated and secured to the grid 2d via the fixing cover 2a, during use, the adsorbent material component 2c and the solid microbial degradation material component 2b are first placed into the grid 2d one by one from the outside to the inside. The fixing cover 2a is then placed on the grid 2d and aligned with the buckle ring. The fixing cover 2a is then rotated clockwise so that the protruding part of the buckle is firmly embedded in the recessed part of the buckle ring to complete the fixation.

[0084] In some embodiments, the top of the reaction liner 2 is also fixed to the reaction module housing 3c using a rotating snap-fit ​​structure. A second snap-fit ​​protrusion is provided on the outer ring of the fixing cover 2a, and a second snap-fit ​​recess is provided on the inner sidewall of the reaction module housing 3c. The reaction liner 2 and the reaction module housing 3c are rotatably snapped together. When the second snap-fit ​​protrusion is placed on the second snap-fit ​​recess, rotating the fixing cover 2a achieves the snap-fit ​​connection between the second snap-fit ​​protrusion of the fixing cover 2a and the second snap-fit ​​recess of the reaction module housing 3c.

[0085] In some embodiments, the power supply module unit 1 includes a fixing plate 1b, a power supply module housing 1d, a solar photovoltaic panel 1a, and a battery 1c. The fixing plate 1b is positioned and suspended on the edge of the well opening. The outer diameter of the fixing plate 1b is larger than the inner diameter of the well opening, allowing the fixing plate 1b to be placed at the well opening. The fixing plate 1b serves to fix the solar photovoltaic panel 1a and to fix the entire device at the well opening. The power supply module housing 1d is connected to the bottom end of the fixing plate 1b and is connected to the reaction module housing 3c. More specifically, the power supply module housing 1d and the reaction module housing 3c are integrally connected. The solar photovoltaic panel 1a is disposed on the outer surface (upper surface) of the fixing plate 1b and is used to convert solar radiation into electrical energy. The battery 1c is a component used to store the electrical energy (DC) generated by the solar photovoltaic panel 1a for use by downstream loads. The battery 1c is positioned on the inner wall of the power supply module housing 1d, and the power supply module housing 1d can provide a certain degree of protection for the battery 1c.

[0086] In this embodiment, the power supply module unit 1 can be directly connected to a power source to supply power to the entire processing device. The power supply module unit 1 can also convert solar radiation into electrical energy through the semiconductor photovoltaic effect of the solar photovoltaic panel 1a, solving the problem of difficult energy supply in the field and providing a wider range of application scenarios for this device. This embodiment utilizes environmentally friendly and clean energy—solar energy—to convert solar radiation into electrical energy through the semiconductor photovoltaic effect of the solar photovoltaic panel, thereby driving the device's operation and further reducing energy consumption. In areas with sufficient sunlight, no other energy source is required.

[0087] The power supply module unit 1 in this embodiment has two operating modes: a simultaneous energy storage and utilization mode, and a pre-storage and post-utilization mode. During periods of low solar radiation, such as nighttime or inclement weather, the power supply module unit 1 can adopt the pre-storage and post-utilization mode. This involves converting solar energy generated during the daytime when solar radiation is strong into electrical energy and storing it, then discharging it at night or during periods of low solar radiation, thus ensuring the device operates normally during these times. During periods of strong solar radiation, the simultaneous energy storage and utilization mode can be used.

[0088] In some embodiments, an internal thread is provided on the inner sidewall of the bottom end of the power supply module housing 1d, and a spiral structure 3a is provided on the top of the reaction module housing 3c. An external thread is provided on the outer sidewall of the spiral structure 3a, so that the reaction module unit 3 is threadedly fitted onto the power supply module housing 1d of the power supply module unit 1, thereby realizing the connection and positioning between the reaction module unit 3 and the power supply module unit 1.

[0089] In some embodiments, the length of the power supply module housing 1d is determined according to the groundwater burial depth. When the groundwater burial depth is deep, the length of the power supply module housing 1d can be set to be longer; when the groundwater burial depth is shallow, the length of the power supply module housing 1d can be set to be shorter, so as to ensure that the reaction module unit 3 and the lower part are located 10cm below the groundwater level, ensuring that normal water intake can be carried out.

[0090] In some embodiments, the drive module unit 4 includes a drive module housing 4a, a drive module, and a control box 4c. The top of the drive module housing 4a has a snap-fit ​​structure, and the drive module housing 4a is connected to the bottom of the reaction module unit 3 via the snap-fit ​​structure. The drive module housing 4a and the bottom of the reaction module unit 3 form a cavity structure with an open bottom. The drive module has propeller blades 4b and is disposed inside the cavity structure. It is powered by the power supply module unit 1 and is used to drive the groundwater to rotate and form a vortex. The drive module can be a waterproof motor or similar structure. The control box 4c is disposed inside the drive module housing 4a and is used to coordinate the operation of the solar photovoltaic panel 1a, the battery 1c, and the propeller blades 4b.

[0091] In this embodiment, the control box 4c can control the drive module to rotate, and the propeller blades 4b drive the groundwater to rotate to form a vortex, so that the groundwater is disturbed from the bottom to both sides, and the groundwater can more easily enter the reaction tank 2 from the side of the reaction module shell 3c, so as to introduce the LNAPL floating on the surface of the groundwater into the reaction tank 2 located in the middle of the device.

[0092] In some embodiments, the drive module unit 4 further includes a support net 4d. The support net 4d is disposed at the top opening of the drive module housing 4a. When the drive module unit 4 is connected to the reaction module unit 3, the support net can contact the support frame 3b and provide a certain support for the support frame 3b. The support net also allows the repaired water molecules to pass through and flow back into the well.

[0093] Chinese invention patent CN112551799A discloses an enhanced treatment device and method for groundwater pollution remediation. This invention is an in-situ remediation technology, including ozone micro-nano bubble water, functional microbial liquid, and ultraviolet lamps. However, it is greatly affected by the environment, the microorganisms have short lifespans, and its mode of action is singular. The device has a complex structure, is difficult to replace and maintain, and cannot perform real-time monitoring and automatic dosing of pollutants such as LNAPL, requiring manual operation and resulting in high costs. To solve the above technical problems, this invention incorporates a water quality monitoring device and an automatic dosing device.

[0094] In some embodiments, the in-well treatment device for remediating LNAPL-contaminated groundwater further includes a water quality monitoring device for real-time monitoring of LNAPL concentration in groundwater and real-time transmission of monitoring data. The water quality monitoring device includes a sensing element 5, a conversion element, and a signal processing system 7. The sensing element 5 is a resistivity detection device, an LNAPL monitoring sensor, located in the middle of the reaction module unit 3, for real-time monitoring of LNAPL concentration in groundwater. The conversion element and signal processing system 7 are located on the surface and are used for signal reception and processing. The signal output terminal of the sensing element 5 is connected to the conversion element, which converts the transmitted signal from the sensing element 5 and feeds it back to the signal processing system 7. The signal processing system 7 compares the groundwater LNAPL concentration information detected by the sensing element 5 with a set threshold.

[0095] In some embodiments, the in-well treatment device for LNAPL-contaminated groundwater remediation further includes an automatic dosing device for adding chemicals to the well based on monitoring information of LNAPL concentration in the groundwater, thereby enhancing the removal of LNAPL contaminants. The automatic dosing device includes a control system 8 and a dosing device 6. The dosing device 6 delivers chemicals into the reaction module unit 3, ensuring thorough mixing between the chemicals and the contaminated groundwater. The dosing device 6 includes a dosing pipe and a dosing tank. The dosing pipe extends from the power supply module housing 1d into the reaction module unit 3, with a dosing port at one end. The dosing port of the dosing device 6 is located inside the reaction module unit 3, and the dosing pipe is equipped with a valve and / or a dosing pump. The control system 8 is located on the surface, and the controlled end of the dosing device 6 is connected to the output end of the control system 8. The control system 8 can control the dosing device 6 to perform the dosing action.

[0096] In this embodiment, the sensing element 5 automatically monitors the LNAPL concentration in groundwater in real time and transmits the monitoring data to the signal processing system 7 in real time. The signal processing system 7 determines whether the LNAPL concentration exceeds a threshold, and if the LNAPL concentration exceeds the threshold, it transmits the signal to the control system 8. The control system 8 then controls the dosing device 6 to inject the oxidizing agent into the groundwater, avoiding insufficient or uneven dosing caused by manual dosing. This ensures accurate and uniform metering, timely dosing, and no lag. It should be noted that the oxidizing agent in this embodiment is persulfate, hydrogen peroxide, ozone, etc.

[0097] In some embodiments, the power supply module unit 1, the reaction module unit 3, and the drive module unit 4 are all made of stainless steel, which has the advantages of high strength, corrosion resistance, and wear resistance.

[0098] Example 2

[0099] This embodiment discloses an in-well treatment method for the remediation of LNAPL-contaminated groundwater. This method is based on the in-well treatment device for LNAPL-contaminated groundwater remediation described in Embodiment 1, and includes the following steps:

[0100] S1. Install the in-well treatment device for LNAPL contaminated groundwater remediation of Example 1 into the well. The specific installation process is as follows: Adsorption material component 2c and / or solid microbial degradation material component 2b are placed inside the grid 2d. The adsorption material component 2c and / or solid microbial degradation material component 2b are locked and positioned onto the grid 2d using the fixing cover 2a. An ultrafiltration membrane component 2e is installed at the bottom of the grid 2d to form the reaction liner 2. The reaction liner 2 is placed on the support frame 3b of the reaction module housing 3c and connected to the inner wall of the reaction module housing 3c via the fixing cover 2a to form the reaction module unit 3. The reaction module housing 3c is threaded to the power supply module housing 1d of the power supply module unit 1. The drive module unit 4 is positioned below the reaction module housing 3c to form an in-well treatment device for LNAPL-contaminated groundwater remediation. The in-well treatment device for LNAPL-contaminated groundwater remediation is lowered into the well, so that the reaction module unit 3 and drive module unit 4 extend below the groundwater surface. The fixing plate 1b is fixedly suspended to the edge of the well.

[0101] S2. The groundwater is driven to form a vortex by the drive module unit 4. The vortex flows from the center to both sides. The groundwater on both sides is more likely to flow into the reaction module unit 3 from the side, thereby introducing the LNAPL pollutants floating on the groundwater surface into the reaction module unit 3 from the side.

[0102] S3. LNAPL pollutants in groundwater are removed through reaction module unit 3. The groundwater first passes through grid 2d to filter large particles such as silt and sand, and then enters the middle ring. LNAPL is adsorbed by the porous adsorption material component in the middle ring, and then the LNAPL is efficiently degraded by the solid microbial material component 2b filled in the inner ring. The treated groundwater molecules are returned to the well through the ultrafiltration membrane component 2e, and LNAPL and surfactants are retained by the ultrafiltration membrane component 2e.

[0103] S4. Repeat steps S2 and S3 until the groundwater remediation is complete.

[0104] In some embodiments, the in-well treatment method for remediation of LNAPL-contaminated groundwater further includes the following steps: each module unit and its components can be flexibly selected and replaced according to the characteristics of LNAPL and / or the wear and tear and / or the remediation requirements.

[0105] Based on the characteristics of LNAPL, the module units can be flexibly selected and replaced: For volatile LNAPL, a heating ring can be installed to improve the volatilization efficiency of LNAPL through heating, thereby effectively removing LNAPL pollutants. And / or for low-concentration LNAPL, a single adsorption material component 2c or a solid microbial degradation material component 2b can be installed, reducing installation costs while ensuring the removal efficiency of LNAPL pollutants. And / or, based on the different properties of LNAPL in different application scenarios, the material of adsorption material component 2c or solid microbial degradation material component 2b can be changed; that is, for LNAPL with different properties in different application scenarios, material components with better adsorption and degradation effects can be selected.

[0106] The module units can be flexibly selected and replaced according to the wear and tear: when the adsorption material component 2c and / or the solid microbial degradation material component 2b reach the adsorption and / or degradation saturation state, only the adsorption material component 2c and / or the solid microbial degradation material component 2b are replaced, without the need for overall replacement, which reduces the cost of use while also achieving good repair effect.

[0107] The module units can be flexibly selected and replaced according to the repair requirements: For application scenarios with high repair requirements, the adsorption material component 2c and the solid microbial degradation material component 2b can be used together to select multiple components; and / or for application scenarios with low repair requirements, only the adsorption material component 2c or the solid microbial degradation material component 2b can be selected.

[0108] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. An in-well treatment device for the remediation of LNAPL-contaminated groundwater, characterized in that, include: The power supply module unit (1) is positioned and suspended on the edge of the wellhead to provide power to the entire device; The reaction module unit (3) is connected below the power supply module unit (1) and is installed inside the well; the reaction module unit (3) includes a reaction module shell (3c) and a reaction liner (2) for removing LNAPL pollutants from groundwater. The side of the reaction module shell (3c) is a groundwater inlet, and the reaction liner (2) is installed inside the reaction module shell (3c). The bottom of the reaction liner (2) is an ultrafiltration membrane assembly for allowing water molecules to pass through and retaining LNAPL pollutants. The drive module unit (4) is located below the reaction module unit (3) and is used to drive the groundwater to form a vortex so as to introduce the LNAPL pollutants floating on the groundwater surface into the reaction module unit (3). The reaction liner (2) includes: a grid (2d) for filtering large particulate impurities in groundwater; the grid (2d) is provided with an adsorption material component (2c) and / or a solid microbial degradation material component (2b), the adsorption material component (2c) is used to adsorb LNAPL pollutants, and the solid microbial degradation material component (2b) is used to efficiently degrade LNAPL pollutants.

2. The in-well treatment device for LNAPL-contaminated groundwater remediation according to claim 1, characterized in that, The adsorption material component (2c) is a porous adsorption material component, which is an organic polymer fiber, sponge or gel type and highly oil-absorbing resin.

3. The in-well treatment device for remediation of LNAPL-contaminated groundwater according to claim 1, characterized in that, The solid microbial degradation material component (2b) has microbial strains with a high ability to degrade LNAPL and biomass materials for supporting the growth of microbial strains and promoting their survival activity. The microbial strains are attached to or wrapped on the solid support material to form a biodegradation array.

4. The in-well treatment device for remediation of LNAPL-contaminated groundwater according to claim 1, characterized in that, The adsorption material component (2c) and / or the solid microbial degradation material component (2b) are rotated and clamped to the grid (2d) by a fixing cap (2a); and / or The reaction liner (2) is rotated and clamped to the reaction module shell (3c).

5. The in-well treatment device for remediation of LNAPL-contaminated groundwater according to claim 1, characterized in that, The power supply module unit (1) includes: The fixing plate (1b) is positioned and suspended on the edge of the wellhead; The power supply module housing (1d) is connected to the bottom of the fixing plate (1b) and connected to the reaction module housing (3c); A solar photovoltaic panel (1a) is installed on the outer surface of a fixed plate (1b) and is used to convert sunlight into electrical energy; A storage battery (1c) is used to store the electrical energy generated by the solar photovoltaic panel (1a).

6. The in-well treatment device for remediation of LNAPL-contaminated groundwater according to claim 1, characterized in that, The drive module unit (4) includes: The drive module housing (4a) is connected to the bottom of the reaction module unit (3) and forms a cavity structure with a bottom opening with the bottom of the reaction module unit (3); The drive module, which has propeller blades (4b) and is located inside the cavity structure, is used to drive the groundwater to rotate and form a vortex; The control box (4c) is located inside the drive module housing (4a) and is used to coordinate the operation of the power supply module unit (1) and the drive module.

7. The in-well treatment device for remediation of LNAPL-contaminated groundwater according to claim 1, characterized in that, Also includes: Water quality monitoring device for real-time monitoring of LNAPL concentration in groundwater; The automatic dosing device includes a control system (8) and a dosing device (6). The dosing port of the dosing device (6) is located inside the reaction module unit (3), and the control system (8) is located on the ground surface. The water quality monitoring device monitors the LNAPL concentration in the groundwater in real time and determines whether the LNAPL concentration exceeds the threshold. When the LNAPL concentration exceeds the threshold, the device transmits the signal to the control system (8) and controls the dosing device (6) to dosing the drug through the control system (8).

8. An in-well treatment method for remediation of LNAPL-contaminated groundwater, characterized in that, Includes the following steps: Install the in-well treatment device for LNAPL contaminated groundwater remediation as described in any one of claims 1-7 into the well; The driving module unit (4) drives the groundwater to form a vortex, and introduces the LNAPL pollutants floating on the groundwater surface into the reaction module unit (3) from the side of the reaction module unit (3); The LNAPL pollutants in the groundwater are removed by the reaction module unit (3), and the LNAPL pollutants are intercepted by the ultrafiltration membrane module, so that the treated water molecules are returned to the well, thus completing the groundwater remediation.

9. The in-well treatment method for remediation of LNAPL-contaminated groundwater according to claim 8, characterized in that, It also includes the following steps: The module units can be flexibly selected and replaced according to the characteristics of LNAPL: for volatile LNAPL, a heating ring can be installed to improve the volatilization efficiency of LNAPL by heating the LNAPL; and / or for low-concentration LNAPL, one of the adsorption material component (2c) or solid microbial degradation material component (2b) can be installed; and / or the material of the adsorption material component (2c) or solid microbial degradation material component (2b) can be changed based on the different properties of LNAPL in different application scenarios. and / or The module units can be flexibly selected and replaced according to the wear and tear: when the adsorption material component (2c) and / or the solid microbial degradation material component (2b) reach the adsorption and / or degradation saturation state, only the adsorption material component (2c) and / or the solid microbial degradation material component (2b) are replaced. and / or The module units can be flexibly selected and replaced according to the repair requirements: for application scenarios with high repair requirements, the adsorption material component (2c) and the solid microbial degradation material component (2b) can be used in combination; and / or for application scenarios with low repair requirements, only the single adsorption material component (2c) or the solid microbial degradation material component (2b) can be selected.

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