Adsorption agent filter and underground water in-situ remediation system

Abstract

The invention discloses an adsorption agent filter and an underground water in-situ remediation system, and belongs to the technical field of pollution remediation. The filter comprises a filter core body and an adsorption barrel body, wherein the filter core body is relatively hollow, and a plurality of water passing holes are formed in the outer wall of the filter core body; the filter core body is sleeved with the adsorption barrel body, the adsorption barrel body comprises a plurality of adsorption layers distributed from inside to outside, the permeability of the adsorption layer located on the inner side is larger than that of the adsorption layer located on the outer side, and the structural strength of the adsorption layer located on the inner side is smaller than that of the adsorption layer located on the outer side. According to the invention, polluted underground water can be filtered and purified.

Description

Technical Field

[0001] The present invention relates to the technical field of pollution remediation, and particularly to an adsorption agent filter and an in-situ groundwater remediation system. Background Art

[0002] The in-situ remediation goal of the agricultural irrigation area is to achieve the sustainability of agricultural production and the remediation of the ecological environment in the area by restoring ecological functions, improving water resource utilization efficiency, and promoting green agricultural development.

[0003] Some agricultural irrigation areas contain multiple aquifers with significantly different permeabilities and aquifers with different pollutant types or concentrations. Existing in-situ remediation technologies cannot effectively treat the above-mentioned agricultural irrigation areas, and have disadvantages such as farmland waste, long construction periods, and high economic investment. Summary of the Invention

[0004] In view of this, it is necessary to provide an adsorption agent filter and an in-situ groundwater remediation system to solve the problem that existing agricultural irrigation areas cannot filter and treat different pollutants in different aquifers.

[0005] In a first aspect, the present invention provides an adsorption agent filter, including:

[0006] A filter core body, which is relatively hollow and has a plurality of water passing holes on its outer wall;

[0007] An adsorption cylinder, sleeved on the filter core body, the adsorption cylinder includes a plurality of adsorption layers distributed from the inside to the outside, the permeability of the adsorption layer located inside is greater than that of the adsorption layer located outside, and the structural strength of the adsorption layer located inside is less than that of the adsorption layer located outside.

[0008] Further, the plurality of adsorption layers are sequentially distributed along the radial direction of the adsorption cylinder, and different adsorption layers are connected to each other.

[0009] Further, the adsorption layer includes fixed particles of an adsorption agent material for adsorbing pollutants, and the particle size of the adsorption layer located inside is greater than that of the adsorption layer located outside.

[0010] Further, the adsorption layer further includes an adhesive and a curing agent, and the fixed particles of the adsorption agent material, the adhesive, and the curing agent are mixed and cured into an annular body.

[0011] Further, the particle size of the adsorption layer located inside is D 内 , the particle size of the adsorption layer located outside is D 外 , the soil particle size in the water to be purified is d 地层 , D 外 = 5 - 7d 地层, D of the adjacent adsorption layer 内 = 7 - 9D 外 .

[0012] Furthermore, the water passing holes are round holes, horizontal slits or vertical slits.

[0013] Furthermore, the aperture of the water passing holes or the width of the slit is K 宽， The particle size of the adsorption layer located in the innermost is D 颗粒， K 宽 = 0.5 - 0.7D 颗粒 .

[0014] Furthermore, the filter core is a plastic pipe body or a steel pipe body.

[0015] In a second aspect, the present invention provides an in-situ groundwater remediation system, including a remediation well, further including the adsorption agent filter, at least two packers and a water pump as described above. The packers are inserted into the remediation well, the side wall of the packer is sealingly connected to the aquitard of the remediation well, a remediation chamber communicating with the aquifer of the remediation well is formed between two adjacent packers, the adsorption agent filter is arranged in the remediation chamber, and the water pump is communicated with the filter core through a pipeline.

[0016] Furthermore, the adsorption cylinder can be adjusted according to the permeability of the aquifer and the types of pollutants.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] (1) For the adsorption agent filter and the in-situ groundwater remediation system of the present invention, a filter core is provided. The filter core is relatively hollow, and a flow channel for accommodating groundwater is formed inside. A number of water passing holes are provided on the inner wall of the filter core. The polluted water to be purified outside the filter core can pass through the water passing holes and enter the filter core, and then be pumped out to the ground.

[0019] (2) An adsorption agent filter and an in-situ groundwater remediation system of the present invention are provided with an adsorption cylinder sleeved on a filter core. The adsorption cylinder includes multiple adsorption layers distributed from the inside outwards, and the adsorption layers are nested in sequence. The permeability of the adsorption layer located inside is greater than that of the adsorption layer located outside. The outer adsorption layer has a lower permeability and is mainly used to intercept pollutants with larger particles, ensuring that the pollutants do not enter the inner layer, thereby reducing the burden on the inner adsorbent. The outer adsorption layer intercepts pollutants with larger particles, and large particulate matter in the water flow will not directly enter the inner layer, reducing the risk of blockage and premature saturation of the inner adsorbent due to treating large particulate pollutants. The outer adsorption layer has a lower permeability while the inner adsorption layer has a higher permeability. Larger particles in the water flow are resisted by the outer adsorption layer and can be more easily captured and intercepted. The higher permeability of the inner adsorption layer enables the water flow to pass through smoothly without generating excessive flow resistance, reducing the pressure drop of the overall system, achieving a smooth transition of pressure, and avoiding unstable filtration effects or system damage caused by excessive pressure drop.

[0020] (3) An adsorption agent filter and an in-situ groundwater remediation system of the present invention include an adsorption agent filter, a packer, and a water pump. The packer is inserted into the remediation well, and the side wall of the packer is hermetically connected to the water-resistant layer of the remediation well. A remediation chamber communicating with the aquifer of the remediation well is formed between two adjacent packers. Each remediation chamber can correspond to an aquifer, and different adsorption agent filters are arranged in different remediation chambers to specifically intercept and remove pollutants in different aquifers. The water pump draws the water flow out of the adsorption agent filter through a pipeline, and can provide continuous and stable suction to ensure that the pollutants in the groundwater fully contact the adsorbent material and are effectively removed. Description of the Drawings

[0021] The drawings described herein are used to provide a further understanding of the present invention and form a part of this application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0022] Figure 1 is the structural schematic diagram of the adsorption agent filter in the present invention Figure 1 ;

[0023] Figure 2 is the structural schematic diagram of the adsorption agent filter in the present invention Figure 2 ;

[0024] Figure 3 is the structural schematic diagram of the adsorption agent filter in the present invention Figure 3 ;

[0025] Figure 4 is the structural schematic diagram of the in-situ groundwater remediation system in the present invention.

[0026] In the figure, 100 is the filter core; 110 is the water passing hole; 200 is the adsorption cylinder; 210 is the adsorption layer; 300 is the repair well; 310 is the aquifer; 320 is the aquitard; 400 is the packer; 500 is the water pump. Specific embodiments

[0027] The following will specifically describe the preferred embodiments of the present invention in conjunction with the accompanying drawings. The accompanying drawings form a part of this application and are used together with the embodiments of the present invention to explain the principles of the present invention, rather than to limit the scope of the present invention.

[0028] An adsorption agent filter and an in-situ groundwater remediation system in this embodiment relate to the technical field of pollution remediation. By using the existing irrigation wells in the agricultural irrigation area, separate areas are set for different permeable layers, and specific adsorption agent filters are used in the separate areas to adsorb and degrade different pollutants in-situ.

[0029] Please refer to Figures 1 to 3 , an adsorption agent filter in this embodiment includes a filter core 100 and an adsorption cylinder 200. The filter core 100 is relatively hollow, and a flow channel for accommodating groundwater is formed inside. A number of water passing holes 110 are provided on the inner wall of the filter core 100. The contaminated water to be purified outside the filter core 100 can pass through the water passing holes 110 and enter the filter core 100, and then be pumped to the ground.

[0030] The adsorption cylinder 200 is sleeved on the filter core 100. The adsorption cylinder 200 includes a plurality of adsorption layers 210 distributed from the inside to the outside. The adsorption layers 210 are nested in sequence. The permeability of the adsorption layer 210 located inside is greater than that of the adsorption layer 210 located outside. The outer adsorption layer 210 has a lower permeability and is mainly used to intercept larger particle pollutants to ensure that the pollutants do not enter the inner layer, thereby reducing the burden on the inner layer adsorbent. The outer adsorption layer 210 intercepts larger particle pollutants, and the large particle substances in the water flow will not directly enter the inner layer, reducing the risk of blockage and premature saturation of the inner layer adsorbent due to the treatment of large particle pollutants. The outer adsorption layer 210 has a lower permeability while the inner adsorption layer 210 has a higher permeability. The larger particles in the water flow are resisted by the outer adsorption layer 210 and can be more easily captured and intercepted. The higher permeability of the inner adsorption layer 210 enables the water flow to pass through smoothly without generating too much flow resistance, reducing the pressure drop of the overall system, achieving a smooth transition of pressure, and avoiding unstable filtration effects or system damage caused by excessive pressure drop.

[0031] The structural strength of the inner adsorption layer 210 is less than that of the outer adsorption layer 210. The outer adsorption layer 210 has higher stability and durability compared to the inner adsorption layer 210, and can withstand stronger collisions and impacts from the outside, maintaining the integrity of the adsorption agent filter and the filtering performance of the adsorption agent filter.

[0032] In some embodiments, referring to Figures 1 to 3 , a plurality of adsorption layers 210 are sequentially distributed along the radial direction of the adsorption cylinder 200. Different adsorption layers 210 are connected to each other, and different adsorption layers 210 have different adsorption capacities, and can perform hierarchical treatment on pollutants of different sizes or properties. When the water flow flows from the outside to the inside, it first passes through the outer layer with strong adsorption capacity to remove some pollutants, and then passes through the inner layer to further adsorb smaller particles or residual harmful substances.

[0033] The adsorption layers 210 are connected to each other and distributed radially, which can ensure that when the water flow passes through the adsorbents of multiple layers, the adsorption load is more evenly distributed. Compared with a single-layer adsorption, multiple connected layers can better avoid oversaturation of a certain layer, reduce the accumulation of pollutants in the filter, and avoid early failure of the filter element.

[0034] The connection between the adsorption layers 210 provides mechanical support, enabling each layer of adsorbent to more stably withstand the pressure of the water flow, and preventing loosening or offset between layers. The structural design of the connection of multiple adsorption layers 210 makes the filter more durable and suitable for maintaining a high filtration efficiency during long-term operation.

[0035] In some embodiments, the adsorption layer 210 includes fixed particles of an adsorption agent material for adsorbing pollutants, and the particle size of the inner adsorption layer 210 is larger than that of the outer adsorption layer 210.

[0036] Larger particulate matter can be first removed in the outer adsorbent, and the inner layer focuses on removing finer particles or dissolved substances. The inner layer of adsorbent will not become prematurely saturated due to the accumulation of larger particulate matter, reducing the blockage problem of the inner layer. By handing over the larger particulate matter to the outer layer for adsorption, the inner layer can maintain its adsorption capacity for a longer time, extending the service life of the inner layer of adsorbent. The larger particle size of the inner layer helps to reduce the resistance when the water flow passes through the filter, thus ensuring that the water flow can smoothly pass through the inner layer without uneven flow or excessive pressure drop due to too many particles.

[0037] In a further embodiment, the adsorption layer 210 further includes an adhesive and a curing agent. Fixed particles of the adsorption agent material with different particle sizes are used as the framework particle material, and after being uniformly stirred at high speed with the proportionally mixed adhesive, curing agent, and diluent, they are filled layer by layer into the annular space outside the filter core 100 to form a ring-shaped body.

[0038] The addition of the adhesive and the curing agent ensures that the adsorbed medicament particles can be firmly fixed together to form a stable structure. The adsorbed medicament particles will not fall off due to water flow scouring or long-term use, maintaining long-term stability and adsorption capacity.

[0039] The curing agent enables the adsorbed layer 210 to form a solid ring after hardening, which can withstand the water flow pressure and physical impact during the operation of the filter, reducing the loss of particles in the adsorbed layer 210.

[0040] In some embodiments, the particle size of the adsorbed layer 210 located on the inner side is D 内 , and the particle size of the adsorbed layer 210 located on the outer side is D 外 , the particle size of the soil in the water to be purified is d 地层 , D 外 = 5 - 7d 地层 , and the D of adjacent adsorbed layers 210 内 = 7 - 9D 外 .

[0041] It should be noted in advance that the general formation lithology is classified into fine silt, fine sand and medium sand. Among them, the sand particle size range (mm) of fine silt is 0.05mm - 0.1mm, the sand particle size range (mm) of fine sand is 0.1mm - 0.25mm, the sand particle size range (mm) of medium sand is 0.1mm - 0.5mm, and the d formation is consistent with the above particle size range.

[0042] Among them, the particle size D of the adsorbed layer 210 located on the outermost layer 外 = 5 - 7d 地层 , and the D of adjacent adsorbed layers 210 内 = 7 - 9D 外 , through the above formula, the particle size of the adsorbed medicament material fixing particles in each adsorbed layer 210 can be calculated to accurately select the particle sizes for different formation lithologies and different inner and outer layers.

[0043] In some embodiments, please refer to Figure 2 and Figure 3 , the water passing holes 110 are round holes, horizontal slits or vertical slits. The round holes can provide a uniform water flow channel, enabling the water flow to flow smoothly when entering the filter, avoiding excessive local resistance or too fast water flow resulting in uneven filtration. The round holes can also reduce the disturbance when the water flow passes through, contributing to maintaining the hydrodynamic stability inside the filter.

[0044] The horizontal slits and vertical slits are arranged through their linear openings, which can generate a certain disturbance effect when the water flow passes through, enhancing the contact between the water flow and the filter layer, and contributing to improving the filtration efficiency. Especially in the horizontal slits, the flow rate and direction of the water flow can be better controlled, so that the pollutants have more opportunities to contact the adsorbent material.

[0045] In some embodiments, the size of the aperture or slit width of the water passing holes is K 宽， The particle size of the adsorption layer located innermost is D 颗粒， K 宽 = 0.5 - 0.7D 颗粒 .

[0046] The size of the aperture or slit width of the water passing holes 110 is K 宽 The particle size of the adsorption layer 210 located innermost is D 颗粒 is 0.5 to 0.7 times that of D. When water flows through the filter, the ratio between the aperture and the particles can ensure that the water flow will not be too concentrated or disordered when passing through. An appropriate aperture can maintain the uniformity of the water flow and avoid too fast local water flow velocity, thus ensuring the hydrodynamic characteristics inside the filter.

[0047] The appropriate size of the aperture or slit width of the water passing holes 110 enables the water flow to be adapted to the particle size of the inner adsorption layer 210 when flowing through the filter, thus ensuring sufficient contact and appropriate residence time of the water flow when contacting the adsorbent surface.

[0048] It should be noted that: the fixed particles of the adsorption reagent material are reagent material particles matched for removing or degrading the pollutants in the aquifer to be repaired, and can be chemical oxidants (such as permanganate, persulfate, etc.), chemical reductants (such as tetrachloroethylene, sodium bisulfite, calcium polysulfide, etc.), natural mineral adsorbents (such as zero-valent iron, activated carbon, bentonite, zeolite, etc.), modified reagents and synthetic adsorbents or inorganic material adsorbents (such as alumina, diatomite, etc.).

[0049] The repair reagents and repair methods adopted for different pollutant types are shown in the following table:

[0050]

[0051]

[0052] In some embodiments, the filter core 100 is a plastic pipe body or a steel pipe body. The steel pipe body usually has higher strength and durability, can withstand greater pressure, and is suitable for use under high pressure and harsh environments. The steel pipe body can remain stable under greater water flow impact force and external environmental pressure, and is not easily deformed or damaged. The hardness and toughness of the steel material enable the filter to maintain structural integrity during long-term use.

[0053] The plastic pipe body is lighter and has better corrosion resistance, and is especially suitable for use in environments with strong acidity or alkalinity. Although the strength of the plastic is not as good as that of the steel material, for general water quality filtration systems, the plastic pipe body is sufficient to meet the strength requirements.

[0054] Please refer to Figure 4 Figure 4 , a in-situ groundwater remediation system in this embodiment includes a remediation well 300, which is a water intake well for pumping water for crop irrigation. In the remediation well 300, there are water-impermeable layers 320 and aquifers 310 arranged in a stacked and staggered manner from top to bottom. The water-impermeable layer 320 can block the flow between different aquifers 310, and groundwater can continuously seep out from the aquifer 310. A in-situ groundwater remediation system also includes an adsorption agent filter, at least two packers 400, and a water pump 500. The packers are inserted into the remediation well 300, and the side walls of the packers are sealingly connected to the water-impermeable layer 320 of the remediation well 300. A remediation chamber communicating with the aquifer 310 of the remediation well 300 is formed between adjacent packers. Each remediation chamber can correspond to an aquifer 310. Different adsorption agent filters are arranged in different remediation chambers to specifically intercept and remove pollutants in different aquifers 310. The water pump 500 draws water out of the adsorption agent filter through a pipeline, and can provide continuous and stable suction to ensure that the pollutants in the groundwater fully contact the adsorbent material and are effectively removed.

[0055] The adsorption agent filter is arranged in the remediation chamber, and adsorbs the pollutants in the groundwater through the adsorption agent material. By directly arranging the remediation well 300, packers 400, and adsorption agent filter in the groundwater in this system, groundwater pollution treatment can be carried out without large-scale earth excavation, avoiding the excavation operation and the cost of transporting polluted soil required in traditional groundwater remediation methods.

[0056] At the same time, the sealing setting of the packers 400 and the remediation well 300 can ensure effective isolation between the remediation area and the external environment, reduce the mutual interference of different pollutants between different aquifers 310, and help enhance the remediation effect.

[0057] In some embodiments, the adsorption cylinder 200 is adjusted according to the changes in the permeability of different aquifers 310 and the types of pollutants, so that the remediation system can make corresponding optimizations according to different geological conditions, pollutant characteristics, and groundwater flow conditions. Different permeabilities and pollutant types are adapted to the remediation system, which can improve the groundwater flow and the removal efficiency of pollutants. Flexibly adjusting the adsorption cylinder 200 helps to achieve the best water quality remediation effect.

[0058] Workflow: Install the adsorption agent filter, packer 400, and water pump 500 into an existing water intake well for agricultural irrigation. The packer 400 is sealed and connected to the water - impermeable layer 320 of the repair well 300 to ensure that the water flow inside the repair well 300 is separated from the water flow in other areas. Adjacent packers 400 form a closed repair chamber, which communicates with the underground aquifer 310, ensuring that only the water flow in the repair area is guided into the filtration system to avoid interference from the water flow in other polluted areas. The water pump 500 is usually connected to the repair well 300 through a pipeline. The water pump 500 can pump groundwater out of the repair well 300, and the purified water passes through the adsorption agent filter to ensure that the pollutants in the groundwater come into full contact with the adsorption agent for effective adsorption and removal. The function of the water pump 500 can maintain the continuous circulation of the water flow in the system. Through the circulating flow, the water body is continuously repaired, so that the pollutants are continuously removed.

[0059] As described above, it is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the present invention.

Claims

1. An adsorption agent filter, characterized in that, Comprising: A filter core, which is relatively hollow and has a plurality of water passing holes on its outer wall; An adsorption cylinder, sleeved on the filter core, the adsorption cylinder includes a plurality of adsorption layers distributed from inside to outside, the permeability of the adsorption layer located inside is greater than that of the adsorption layer located outside, and the structural strength of the adsorption layer located inside is less than that of the adsorption layer located outside.

2. The adsorption agent filter according to claim 1, wherein The plurality of adsorption layers are sequentially distributed along the radial direction of the adsorption cylinder, and different adsorption layers are connected to each other.

3. The adsorption agent filter according to claim 2, characterized in that, The adsorption layer includes fixed particles of an adsorption agent material for adsorbing pollutants, and the particle size of the adsorption layer located inside is greater than that of the adsorption layer located outside.

4. The adsorption agent filter according to claim 3, characterized in that, The adsorption layer further includes an adhesive and a curing agent, and the fixed particles of the adsorption agent material, the adhesive and the curing agent are mixed and cured into an annular body.

5. An adsorption agent filter according to claim 3, characterized in that, The particle size of the adsorption layer located on the inner side is D 内 , and the particle size of the adsorption layer located on the outer side is D 外 , and the particle size of the soil in the water to be purified is d 地层 , D 外 = 5 - 7d 地层 , and the D of the adjacent adsorption layer 内 = 7 - 9D 外 .

6. The adsorption agent filter according to claim 3, characterized in that, The water passing holes are round holes, horizontal strip slots or vertical strip slots.

7. The adsorption agent filter according to claim 6, characterized in that, The aperture diameter of the water passing hole or the dimension of the slit width is K 宽， The particle size of the adsorption layer located at the innermost side is D 颗粒， K 宽 = 0.5 - 0.7D 颗粒 .

8. The adsorption agent filter according to claim 1, characterized in that, The filter core is a plastic pipe body or a steel pipe body.

9. An in-situ groundwater remediation system, comprising a remediation well, characterized in that, It further includes an adsorption agent filter as described in any one of claims 1-8, at least two packers and a water pump. The packers are inserted into the repair well, the side wall of the packer is sealingly connected to the water isolation layer of the repair well, and a repair chamber communicating with the aquifer of the repair well is formed between two adjacent packers. The adsorption agent filter is arranged in the repair chamber, and the water pump is communicated with the filter core through a pipeline.

10. A in-situ groundwater remediation system according to claim 9, characterized in that, The adsorption cylinder can be adjusted according to the different permeabilities of the aquifer and the types of pollutants.

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