A filler-enhanced circulation well system based on funnel internals

Abstract

The present invention discloses a filler-enhanced circulation well system based on a funnel internal component, belonging to the technical field of groundwater remediation; the system comprises two parts, an outer well pipe and an inner well pipe; the outer well pipe is divided into four parts from bottom to top, a lower screen pipe, a middle barrier, an upper screen pipe and a top seal; the inner well pipe is provided with a submersible pump and a funnel internal component from bottom to top; wherein, a filler bed layer is provided inside the funnel internal component; the present invention effectively strengthens hydraulic circulation and reduces construction difficulty by adding a funnel-shaped internal component to replace the traditional inner pipe sealing system; the provision of the filler bed layer can expand the scope and efficiency of pollutant treatment, so as to provide a new and efficient circulation well technology suitable for the remediation of various contaminated sites.

Description

Technical Field

[0001] The present invention relates to the technical field of groundwater restoration, and in particular to a filler-enhanced circulation well system based on funnel internals. Background Art

[0002] Soil and groundwater remediation has been underway in Europe and the United States for over half a century, dating back to the 1950s. While the relevant industry in my country started later, it has also experienced two to three decades of development. For decades, technological advancements have consistently underpinned the industry's growth, and the emergence of a plethora of remediation technologies has provided a wider range of options for remediating different types of contaminated sites. In recent years, as decommissioned contaminated sites have gradually begun or completed remediation work, the industry has shifted its focus to the remediation of active contaminated sites. However, due to the more stringent construction requirements for active sites, many cost-effective but extensive remediation technologies are difficult to apply. Therefore, the development of in-situ remediation technologies for different types of contaminants may offer new growth opportunities for the industry.

[0003] Groundwater circulation well technology is a type of remediation technology that uses groundwater flow enhancement to achieve pollutant removal. Conventional circulation well technology usually uses aeration to treat pollutants, so it is only suitable for the treatment of volatile organic pollutants, and existing technology improvements often develop towards more complex well structure designs or system designs. Although better pollution remediation effects can be achieved, the remediation costs are not easy to control. Patent documents CN114940527, CN112645542, CN115180714, CN217677200 disclose circulation well improvement schemes such as component enhancement, biological enhancement, oxidation enhancement, and thermal enhancement. From a technical principle, they can indeed achieve the enhancement and improvement of actual operating effects, but they have not yet broken through the limitations of the pollutant treatment range inherent in circulation wells. At the same time, complex system enhancements will also bring additional operating costs.

[0004] Therefore, overall, groundwater circulation well technology still needs to be improved in the direction of greater applicability and cost-friendliness. Summary of the Invention

[0005] In response to the shortcomings of the prior art, the present invention aims to provide a filler-enhanced circulation well system based on funnel internals. By providing a funnel-shaped internal containing filler, the height difference between the liquid level in the well pipe and the groundwater level is increased, the driving force of the hydraulic circulation is improved to strengthen the hydraulic circulation. At the same time, the use of filler helps to ensure the efficiency of remediation, and also makes the application scenarios of the circulation well not limited to volatile pollutants, but can also be expanded to (heavy) metal and any other type of contaminated site remediation. Through the organic combination of circulation well technology and filler remediation technology, the present invention has greatly expanded and extended the groundwater circulation well technology, and can provide a more reliable option for in-situ remediation of active sites.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] In the first aspect, the present invention provides a filler-enhanced circulation well system based on a funnel internal, comprising two parts: an outer well pipe and an inner well pipe. The outer well pipe is divided into four parts from bottom to top: a lower screen pipe, a middle barrier, an upper screen pipe, and a top seal. The inner well pipe is provided with a submersible pump and a funnel internal from bottom to top. The submersible pump and the funnel internal are connected by a water outlet pipeline, and a filler bed is provided inside the funnel internal.

[0008] As a further preferred embodiment of the technical solution of the present invention, the funnel internals include a narrow-mouth section, a variable-diameter section and a wide-mouth section from bottom to top, wherein the narrow-mouth section is connected to the outlet of the submersible pump through a water outlet pipe.

[0009] As a further preferred embodiment of the technical solution of the present invention, the bottom of the narrow-mouth section of the funnel internal component is located in the lower middle part of the middle barrier; and the top of the wide-mouth section is located in the upper middle part of the upper sieve tube.

[0010] As a further preferred embodiment of the technical solution of the present invention, the packing bed is arranged at the bottom of the funnel internals, and the height of the packing bed is not less than the height of the narrow mouth section of the funnel internals.

[0011] As a further preferred embodiment of the technical solution of the present invention, the diameter of the narrow mouth section of the funnel inner part is 10% to 70% of the inner diameter of the well pipe, and the diameter of the wide mouth section is 60% to 95% of the inner diameter of the well pipe; further preferred, the diameter of the narrow mouth section of the funnel inner part is 20% to 50% of the inner diameter of the well pipe, and the diameter of the wide mouth section is 80% to 90% of the inner diameter of the well pipe.

[0012] As a further preferred embodiment of the technical solution of the present invention, a liquid distributor is provided between the water outlet pipeline and the packing bed.

[0013] As a further preferred embodiment of the technical solution of the present invention, the lower sieve pipe and the upper sieve pipe are filled with quartz sand.

[0014] As a further preferred embodiment of the technical solution of the present invention, the middle barrier and the top seal are filled with bentonite.

[0015] In a second aspect, the present invention claims protection for the application of the filler-enhanced circulation well system based on funnel internals in the field of groundwater remediation.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The filler-enhanced circulation well system based on the funnel internals described in the present invention includes two parts: the outer part of the well pipe and the inner part of the well pipe. The outer part of the well pipe is filled with quartz sand, bentonite, quartz sand, and bentonite in sequence from bottom to top to a certain height, forming four parts: the lower screen pipe, the middle barrier, the upper screen pipe, and the top seal, so as to replace the casing structure and the seals in the well pipe used in the construction of traditional circulation wells, thereby saving component costs; a submersible pump is used for hydraulic lifting in the well pipe, and a funnel-shaped internal part is provided to increase the height difference between the liquid level in the well pipe and the groundwater level, thereby increasing the driving force of the hydraulic circulation and strengthening the hydraulic circulation; a filler bed is provided in the funnel internal part. The use of filler helps to ensure the remediation efficiency, and also makes the application scenarios of the circulation well not limited to volatile pollutants, but can also be expanded to the remediation of (heavy) metals and any other types of contaminated sites.

[0018] 2. The system provided by the present invention is based on the principle of conventional groundwater circulation wells. It creatively sets a funnel-shaped internal part containing filler outside the outlet pipe of the submersible pump. Through simple component settings, it plays a multi-effect strengthening role in the remediation of contaminated groundwater circulation wells. The setting of the funnel-shaped internal part helps to reduce the back mixing of the liquid in the well pipe, increase the liquid level in the well pipe, enhance the driving effect of the circulation flow field, strengthen the circulation flow field, and thus achieve enhanced remediation of pollutants; the coupling of the filler can not only effectively treat pollutants and greatly improve the efficiency of pollutant treatment, but also can broaden the applicable types of pollutants. The circulation well technology will not only be limited to the remediation of volatile organic compound pollution, but can also be applied to the remediation of (heavy) metals and other pollution, thereby achieving convenient, efficient, and cost-controlled in-situ remediation of various types of complex contaminated sites.

[0019] 3. The circulation well of the present invention adopts a convenient single-well pipe construction scheme, which reduces the construction difficulty and is low-cost; the combined use of submersible pumps, funnel internals and fillers has greatly expanded and extended the groundwater circulation well technology, and can provide a more reliable option for in-situ remediation of existing sites.

[0020] In short, the solution provided by the present invention is simple, easy to implement, economical and practical, and can be widely promoted and applied in the field of groundwater remediation technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of a filler-enhanced circulation well system based on funnel internals according to the present invention;

[0022] Among them, 1. Top seal; 2. Inner well pipe; 3. Upper screen pipe; 4. Middle barrier; 5. Lower screen pipe; 6. Funnel internals; 7. Packing bed; 8. Liquid distributor; 9. Water outlet pipeline; 10. Submersible pump. DETAILED DESCRIPTION

[0023] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be understood that the terms "center", "up", "down", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0025] In addition, in the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0026] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in light of specific circumstances.

[0027] See also Figure 1 The present invention provides a filler-enhanced circulation well system based on a funnel internal, comprising two parts: an outer well pipe and an inner well pipe. The outer well pipe is divided into four parts from bottom to top: a lower screen pipe 5, a middle barrier 4, an upper screen pipe 3, and a top seal 1; the inner well pipe 2 is provided with a submersible pump 10 and a funnel internal 6 from bottom to top; wherein, the submersible pump 10 and the funnel internal 6 are connected via a water outlet pipe 9, and a filler bed 7 is provided inside the funnel internal 6.

[0028] In the above technical solution, the circulation well adopts a convenient construction method, and the construction process refers to the conventional groundwater monitoring well construction method, but the specific implementation is different. After the well drilling is completed and the well pipe with screen is installed, the outside of the well pipe is filled with a certain height of quartz sand, bentonite, quartz sand, and bentonite from bottom to top, forming four parts: the lower screen pipe 5, the middle barrier 4, the upper screen pipe 3 and the top seal 1; the present invention creatively adopts the layered filling method outside the well pipe to construct a sealing layer to replace the casing structure and the seal inside the well pipe used in the construction of traditional circulation wells, saving component costs.

[0029] It can be understood that, in the above technical solution, the height of each section of the lower screen pipe 5, the middle barrier 4, the upper screen pipe 3 and the top seal 1 is determined according to the specific remediation design of the contaminated site; as a preferred technical solution of the present invention, the height of the lower screen pipe 5 is 20% to 50% of the groundwater depth, the height of the middle barrier 4 is 20% to 50% of the groundwater depth, and the height of the upper screen pipe 3 below the groundwater level is 30% to 60% of the groundwater depth; in specific implementation, the height of the lower screen pipe 5 can be 20%, 50% and 60% of the groundwater depth. 25%, 30%, 35%, 40%, 45%, 50% or any specific value between 20% and 50%; the height of the middle barrier 4 can be 20%, 25%, 30%, 35%, 40%, 45%, 50% or any specific value between 20% and 50% of the groundwater depth; the height of the upper screen pipe 3 below the groundwater level is 30%, 35%, 40%, 45%, 50%, 55%, 60% or any specific value between 30% and 60% of the groundwater depth.

[0030] Furthermore, it can be understood that, in the above technical solution, the funnel internal part 6 includes a narrow-mouth section, a variable-diameter section and a wide-mouth section from bottom to top; the height of each section of the funnel internal part 6 is designed according to the actual well construction situation; as a preferred technical solution of the present invention, the height of the narrow-mouth section accounts for 20% to 50% of the overall height of the funnel internal part, the height of the variable-diameter section accounts for 10% to 30% of the overall height of the funnel internal part, and the height of the wide-mouth section accounts for 40% to 80% of the overall height of the funnel internal part; in specific implementation, the height of the narrow-mouth section can account for 10% to 30% of the overall height of the funnel internal part. 20%, 25%, 30%, 35%, 40%, 45%, 50% or any specific value between 20% and 50%; the height of the reducing section can be 10%, 15%, 20%, 25%, 30% or any specific value between 10% and 30% of the overall height of the funnel inner part; the height of the wide-mouth section can be 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80% or any specific value between 40% and 80% of the overall height of the funnel inner part.

[0031] Furthermore, the diameter of the narrow mouth section of the funnel inner part 6 is 10% to 70% of the inner diameter of the well pipe, and the diameter of the wide mouth section is 60% to 95% of the inner diameter of the well pipe; preferably, the diameter of the narrow mouth section of the funnel inner part 6 is 20% to 50% of the inner diameter of the well pipe, and the diameter of the wide mouth section is 80% to 90% of the inner diameter of the well pipe; in specific implementation, the diameter of the narrow mouth section can be 10%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 60%, 70% or any value in the range of 10% to 70% of the inner diameter of the well pipe; the diameter of the wide mouth section is 60%, 65%, 70%, 75%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88, 89%, 90% or any value in the range of 60% to 95% of the inner diameter of the well pipe.

[0032] It can be understood that, in the above technical solution, the installation position of the funnel internals 6 is determined according to the actual well construction situation and the specific remediation design of the contaminated site; as a preferred technical solution of the present invention, the lower edge of the narrow-mouth section of the funnel internals 6 is located below the height of the interruption barrier 4, and further, is arranged in the lower middle part of the interruption barrier 4; the upper edge of the wide-mouth section of the funnel internals 6 is located in the upper middle part of the upper screen pipe 3 to achieve hydraulic circulation.

[0033] It can be understood that, in the above technical solution, the narrow-mouth section of the funnel inner part 6 is connected to the outlet of the submersible pump 10 through the water outlet pipe 9 .

[0034] Furthermore, in the above technical solution, the packing bed 7 is arranged at the bottom of the funnel internal part 6, and the height of the packing bed 7 is not less than the height of the narrow mouth section of the funnel internal part 6; it can be understood that the height of the packing bed can be flexibly adjusted according to the on-site construction conditions, and can be continuously filled to the variable diameter section and the wide mouth section according to the actual remediation design of the contaminated site.

[0035] Furthermore, a liquid distributor 8 is provided between the water outlet pipe 9 and the packing bed 7; the water outlet pipe 9 is directly connected to the liquid distributor 8, and the packing bed 7 is provided above the liquid distributor 8; the liquid distributor 8 can be used to reduce dead zones and improve the utilization rate of the packing; it can be understood that the setting of the liquid distributor 8 can be flexibly adjusted according to the design of the packing bed 7, and when the packing bed section is thinner or higher, the liquid distributor 8 can be abandoned.

[0036] It can be understood that in the above technical solution, the packing bed 7 can be provided with formed packing or bulk packing, and the packing can be selected from one or more of adsorption type, chemical oxidation type, chemical reduction type, and biological load type packing according to the pollution treatment requirements, and the present invention does not make specific limitations on this; it can be understood that different types of packing have different adsorption principles and adsorption capacities, and common physical adsorption, chemical oxidation, biological decomposition and other packing materials can be used as fillers in this device; preferably, the filler is selected from one or more of activated carbon, molecular sieve, calcium peroxide, and calcium persulfate; more preferably, the above filler can be of mixed or loaded type, such as activated carbon or molecular sieve packing loaded with calcium peroxide or calcium persulfate; the packing bed of the present invention can provide pollutant treatment functions such as physical adsorption or chemical remediation, and on the basis of improving the treatment efficiency, it can effectively expand the pollutant treatment type of the circulation well, not only limited to volatile organic pollutants, but also expanded to treat other types of organic pollutants and heavy metal pollutants.

[0037] See further below Figure 1 The implementation principle and process of the filler-enhanced circulation well system based on the funnel internals of the present invention are described as follows:

[0038] When the system is running, the groundwater in the lower part of the well pipe is transported upward by the submersible pump 10, connected to the liquid distributor 8 through the outlet pipe 9, and enters the packed bed 7 after being evenly distributed by the liquid distributor 8 to complete the pollutant treatment. Then it flows out through the wide-mouthed upper end of the funnel inner part 6, and a height difference is formed between the liquid level in the well pipe and the groundwater level outside the well pipe. Due to the presence of the funnel inner part 6, the back mixing in the well pipe is weakened, and the height difference is further increased. The treated water overflows outward through the upper screen pipe 3; since the water in the lower part of the well pipe is pumped out and the funnel inner part 6 limits the back mixing in the well pipe, the pressure in the lower part of the well pipe is further reduced, and the groundwater outside the well pipe is replenished into the well through the lower screen pipe 5, thereby forming a hydraulic cycle; the contaminated groundwater within the circulating flow field continuously flows into the lower part of the circulating well and completes the pollutant treatment in the packed bed 7, realizing the treatment and remediation of various groundwater pollutants in the area.

[0039] Application Example 1

[0040] In a 1.6m×0.8m×2.8m groundwater simulation test site, a clay layer of about 0.2m was laid at the bottom, sand of about 2.4m was laid in the middle layer, and topsoil of about 0.1m was laid on the upper layer. The total water level was raised to a height of 2.4m at the groundwater simulation test site, and a filler-enhanced circulation well system based on funnel internals was laid out at preselected points according to the specific implementation method; the diameter of the narrow section of the funnel internals was 20% of the inner diameter of the well pipe, and the diameter of the wide section was 70% of the inner diameter of the well pipe; the narrow section accounted for 30% of the overall height of the funnel internals, and the wide section accounted for 70%; the filler was a molecular sieve loaded with bulk calcium persulfate (Y-type molecular sieve, impregnation loading, loading amount 10wt.%), and the filler amount was 100mL.

[0041] 1,2-dichloropropane was injected at a preselected point with an injection depth of 2m. The concentration of 1,2-dichloropropane in the water at 2m was measured to be 802ug / L. After 3 days, the concentration of 1,2-dichloropropane in the water at 2m was measured to be 757ug / L.

[0042] At the beginning of the test, the submersible pump was started. After 24 hours, the pollutant concentration in the water detected from the monitoring well was 322ug / L. The enhanced treatment system provided by this solution can achieve a pollutant removal rate of 57.5% in a short period of time.

[0043] Application Example 2

[0044] In a 1.6m×0.8m×2.8m groundwater simulation test site, a clay layer of approximately 0.2m was laid at the bottom, sand of approximately 2.4m was laid in the middle layer, and topsoil of approximately 0.1m was laid in the upper layer. The total water level was raised to 2.4m above the groundwater simulation test site. A filler-enhanced circulation well system based on funnel internals was laid out at preselected points according to the specific implementation method; the diameter of the narrow-mouth section of the funnel internals was 40% of the inner diameter of the well pipe, and the diameter of the wide-mouth section was 90% of the inner diameter of the well pipe; the narrow-mouth section accounted for 20% of the overall height of the funnel internals, the filler transition section accounted for 10%, and the wide-mouth section accounted for 70%; the filler selected was a mixed filler of structured activated carbon and tourmaline (activated carbon: tourmaline = 7:3), and the filler volume was 50mL.

[0045] Toluene was injected at a preselected point with an injection depth of 1m. The toluene concentration in the water at 1m was measured to be 620ug / L. After 3 days, the toluene concentration in the water at 1m was measured to be 586ug / L.

[0046] At the beginning of the test, the submersible pump was started. After 48 hours, the pollutant concentration in the water detected from the monitoring well was 121ug / L. The enhanced treatment system provided by this solution can achieve a pollutant removal rate of 79.4% in a short period of time.

[0047] Application Example 3

[0048] In a 1.6m×0.8m×2.8m groundwater simulation test site, a clay layer of approximately 0.2m was laid at the bottom, sand of approximately 2.4m was laid in the middle layer, and topsoil of approximately 0.1m was laid in the upper layer. The total water level was raised to a height of 2.4m at the groundwater simulation test site. A filler-enhanced circulation well device based on funnel internals was arranged at preselected points according to the specific implementation method; the diameter of the narrow-mouth section of the funnel internals was 20% of the inner diameter of the well pipe, and the diameter of the wide-mouth section was 80% of the inner diameter of the well pipe; the narrow-mouth section accounted for 40% of the overall height of the funnel internals, and the wide-mouth section accounted for 60%; the filler selected was a loose activated carbon filler loaded with zero-valent iron (impregnation loading, loading amount 10wt.%), and the filler amount was 80mL.

[0049] Lead nitrate was injected at a preselected point with an injection depth of 1m. The lead ion concentration in the water at 1m was measured to be 1152ug / L. After 3 days, the lead ion concentration in the water at 1m was measured to be 1043ug / L.

[0050] At the beginning of the test, the submersible pump was started. Six hours later, the pollutant concentration in the water detected from the monitoring well was 627ug / L. The enhanced treatment system provided by this solution can achieve a pollutant removal rate of 39.9% in a short period of time.

[0051] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A filler-enhanced circulation well system based on funnel internals, comprising two parts, an outer well pipe and an inner well pipe, characterized in that: The outer side of the well pipe is divided into four parts from bottom to top: a lower screen pipe (5), a middle barrier (4), an upper screen pipe (3) and a top seal (1); the inner well pipe (2) is provided with a submersible pump (10) and a funnel inner part (6) from bottom to top; wherein the submersible pump (10) and the funnel inner part (6) are connected through a water outlet pipe (9), and a packing bed (7) is provided inside the funnel inner part (6); The funnel inner part (6) comprises a narrow-mouth section, a variable-diameter section and a wide-mouth section from bottom to top, wherein the narrow-mouth section is connected to the outlet of the submersible pump (10) through a water outlet pipe (9); The lower edge of the narrow-mouth section of the funnel inner part (6) is arranged at a height below the middle barrier (4); the upper edge of the wide-mouth section is arranged at the middle and upper part of the upper screen tube (3); wherein the packing bed (7) is arranged at the bottom of the funnel internal part (6); The height of the packing bed (7) is not less than the height of the narrow mouth section of the funnel internal component (6).

2. A filler-enhanced circulation well system based on funnel internals according to claim 1, characterized in that: The diameter of the narrow-mouth section of the funnel inner part (6) is 10% to 70% of the inner diameter of the well pipe, and the diameter of the wide-mouth section is 60% to 95% of the inner diameter of the well pipe.

3. A filler-enhanced circulation well system based on funnel internals according to claim 2, characterized in that: The diameter of the narrow-mouth section of the funnel inner part (6) is 20% to 50% of the inner diameter of the well pipe, and the diameter of the wide-mouth section is 80% to 90% of the inner diameter of the well pipe.

4. A filler-enhanced circulation well system based on funnel internals according to claim 1, characterized in that: A liquid distributor (8) is also provided between the water outlet pipeline (9) and the packing bed (7).

5. The filler-enhanced circulation well system based on funnel internals according to claim 1, characterized in that: The lower screen tube (5), the middle barrier (4), the upper screen tube (3) and the top seal (1) are filled with quartz sand, bentonite, quartz sand and bentonite in sequence.

6. Use of a filler-enhanced circulation well system based on funnel internals according to any one of claims 1 to 5 in the field of groundwater remediation.

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