A permeable reaction system for groundwater pollution remediation
The system, consisting of a pressure relief well, a water pipe, a collection tank, and a water distributor, combined with the flexible connection of the permeable reactive pipe and the selection of filler material, solves the problems of complex construction and low filler material utilization of traditional permeable reactive walls, and achieves flexible and efficient groundwater pollution remediation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- THE ARCHITECTURAL DESIGN & RES INST OF ZHEJIANG UNIV CO LTD
- Filing Date
- 2025-08-12
- Publication Date
- 2026-07-14
AI Technical Summary
Traditional permeable reactive barriers are complex to construct, have low filler utilization rates, and are difficult to replace, making them unsuitable for the remediation needs of groundwater pollution that fluctuate dynamically in terms of pollution levels.
A combined system consisting of pressure relief wells, water delivery pipes, collection tanks, water distributors, and permeable reaction pipes is adopted. Groundwater is captured through pressure relief wells and evenly introduced into the permeable reaction pipes. The flexible connection and replacement of the permeable reaction pipes and the selection of packing materials according to the pollution level enable efficient purification.
It simplifies the construction process, improves the utilization rate of fillers, reduces replacement costs, adapts to the remediation needs of different pollution scenarios, and improves purification efficiency.
Smart Images
Figure CN224493894U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of water treatment technology, and more specifically, to a permeable reaction system for groundwater pollution remediation. Background Technology
[0002] Groundwater resources are a vital strategic resource for maintaining the ecological environment and human production and daily life. However, with the acceleration of industrialization and urbanization, pollutants such as heavy metals, volatile organic compounds, and pesticide residues enter aquifers through infiltration and leakage, posing a serious threat to water quality safety. Groundwater pollution is characterized by its high degree of concealment, rapid diffusion, and difficulty in remediation; therefore, efficient and economical remediation technologies have become a hot research topic in the industry.
[0003] Among existing groundwater pollution remediation technologies, the permeable reactive barrier (PRB) technology is widely used due to its advantages such as requiring no continuous power input and low operating costs. Its principle involves placing a wall filled with active material along the migration path of the pollution plume, removing pollutants through adsorption, sedimentation, and oxidation-reduction reactions. However, traditional PRBs have the following significant drawbacks:
[0004] Significant construction limitations: It requires excavation of continuous walls to a depth of over 10 meters, has poor adaptability to complex geological conditions (such as rock strata and high water table strata), has a construction period of 30-60 days, and is prone to causing safety hazards such as surface subsidence;
[0005] Low filler utilization: Once the wall material is fixed and filled, it cannot be adjusted. Due to the uneven distribution of pollutant concentration, the filler in some areas becomes saturated prematurely, and the overall treatment efficiency drops rapidly over time.
[0006] High maintenance costs: If the filler needs to be replaced, the wall needs to be demolished and rebuilt, which is a large-scale project with high costs and is difficult to adapt to the remediation needs of dynamic changes in the degree of pollution.
[0007] Therefore, developing a remediation system that is easy to construct, allows for flexible replacement of fillers, and is adaptable to different pollution scenarios is key to solving the above problems. Utility Model Content
[0008] The purpose of this invention is to provide a permeable reaction system for groundwater pollution remediation, which can solve the problems of traditional permeable reaction walls, such as large excavation depth, complicated on-site construction process, low utilization rate of filler material, and troublesome replacement of filler material.
[0009] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a permeable reaction system for groundwater pollution remediation, comprising a pressure relief well, a water inlet pipe, a collection tank, a water distributor, and a permeable reaction pipe. The pressure relief well is connected to the collection tank through the water inlet pipe. The collection tank is connected to an outlet pipe. The outlet pipe is connected to the water distributor. A flow control valve is provided between the outlet pipe and the water distributor. The water distributor is connected to the permeable reaction pipe.
[0010] By employing the above technical solution, contaminated groundwater is captured through a pressure-reducing well and then transferred to a collection tank via a water pipe. The collection tank, in addition to its collection function, also regulates groundwater quality and buffers flow velocity. A water distributor is installed at the other end of the collection tank's outlet pipe. The distributor ensures that groundwater flows evenly into a permeable reaction pipe filled with packing material, thereby achieving centralized groundwater purification.
[0011] The present invention is further configured such that the decompression well includes a primary decompression well and two secondary decompression wells located on both sides thereof.
[0012] The present invention is further configured such that: the primary pressure relief well is located in the core area of the groundwater pollution plume, and the secondary pressure relief wells are located on both sides downstream of the primary pressure relief well, forming a triangular distribution with the primary pressure relief well.
[0013] By adopting the above technical solution, most of the groundwater is collected by setting up a primary decompression well in the contaminated aquifer. Then, two secondary decompression wells are set up on both sides at a certain distance downstream of the primary decompression well along the groundwater flow direction to further collect the contaminated groundwater that could not be captured by the primary decompression well.
[0014] The present invention is further configured such that: the depth of the pressure relief well is 1.2 times the thickness of the aquifer, and the well wall is wrapped with 50-mesh filter cloth to prevent silt from entering.
[0015] The present invention is further configured such that the permeable reaction tube is formed by connecting a permeable unit reaction tube to a flange.
[0016] The present invention is further configured such that: the water distributor is composed of a porous polyethylene pipe with a diameter of 100mm and a length of 1m, and is distributed in a circular pattern along the pipe diameter.
[0017] The present invention is further configured such that the permeable unit reaction tube has a length of 2-4m and a diameter of 1-2m.
[0018] The present invention is further configured such that the flange is sealed with a rubber sealing ring with a pressure resistance of ≥0.2MPa.
[0019] By adopting the above technical solution, the installation, removal, and replacement are not only very convenient, but the manufacturing flexibility is also great. Depending on the groundwater pollution level and control requirements, the packing material and pipe length of each section of the permeable unit reaction pipe can be different. Moreover, the connecting materials, flanges, and rubber sealing rings are relatively easy to obtain, the replacement cost is low, and the construction method is also relatively easy.
[0020] In summary, this utility model has the following beneficial effects:
[0021] This invention achieves the collection of most groundwater by setting up a primary pressure relief well in the contaminated aquifer. Two secondary pressure relief wells are then installed at a certain distance downstream of the primary well along the groundwater flow direction to further collect the contaminated groundwater that failed to be captured by the primary well. The groundwater from the three pressure relief wells flows into a collection pool through their respective conduits. Besides its collection function, the collection pool also regulates groundwater quality and buffers flow velocity. A water distributor is installed at the other end of the collection pool's outlet pipe. The distributor ensures that groundwater is evenly distributed into permeable reaction pipes filled with packing material, thus achieving centralized groundwater purification. The permeable reaction pipes are composed of interconnected permeable unit reaction pipes. The installation, removal, and replacement of these permeable unit reaction pipes are not only convenient but also highly flexible in their manufacturing. Depending on the groundwater contamination level and control requirements, the packing material and pipe length of each permeable unit reaction pipe can vary. This invention solves the problems of traditional permeable reaction walls, such as large excavation depth, cumbersome on-site construction processes, low packing material utilization, and troublesome packing material replacement. Attached Figure Description
[0022] Fig. 1 This is a design drawing of the system in an embodiment of this utility model.
[0023] Fig. 2 This is a cross-sectional view of the system in an embodiment of this utility model; the blue arrow in the figure indicates the direction of water flow.
[0024] In the diagram: 1. Primary pressure relief well; 2. Water guide pipe; 3. Collection tank; 4. Water outlet pipe; 5. Water distributor; 6. Permeable unit reaction pipe; 7. Flange; 8. Secondary pressure relief well; 9. Control flow valve. Detailed Implementation
[0025] The following is in conjunction with the appendix Figs. 1-2 The present invention will be described in further detail below.
[0026] Example: A permeable reaction system for groundwater pollution remediation, such as Figs. 1-2As shown, the system includes a pressure relief well, a water inlet pipe 2, a collection tank 3, a water distributor 5, and a permeable reaction pipe. The pressure relief well is connected to the collection tank 3 via the water inlet pipe 2. The collection tank 3 is connected to an outlet pipe 4, which is connected to the water distributor 5. A flow control valve 9 is installed between the outlet pipe 4 and the water distributor 5. The water distributor 5 is connected to the permeable reaction pipe. The water distributor 5 is composed of porous polyethylene pipes with a diameter of 100 mm and a length of 1 m, arranged in a circular pattern along the pipe diameter. The pressure relief well includes one primary pressure relief well 1 and two secondary pressure relief wells 8 located on either side of it. The primary pressure relief well 1 is located in the core area of the groundwater pollution plume, and the secondary pressure relief wells 8 are located on both sides downstream of the primary pressure relief well 1, forming a triangular distribution with the primary pressure relief well 1. The depth of the pressure relief well is 1.2 times the thickness of the aquifer, and the well wall is wrapped with 50-mesh filter cloth to prevent sediment from entering. The permeable reaction pipe is composed of a permeable unit reaction pipe 6 connected to a flange 7. The permeable unit reaction tube 6 is 2-4m in length and 1-2m in diameter. The flange 7 is sealed with a rubber sealing ring and has a pressure resistance of ≥0.2MPa.
[0027] Working Principle: This invention uses a primary pressure relief well 1 in the contaminated aquifer to collect most of the groundwater. Two secondary pressure relief wells 8 are then installed at a certain distance downstream of the primary well 1 along the groundwater flow direction to further collect the contaminated groundwater that was not captured by the primary well 1. The groundwater from the three pressure relief wells flows into a collection tank 3 through their respective guide pipes 2. In addition to its collection function, the collection tank 3 also regulates groundwater quality and buffers flow velocity. A water distributor 5 is installed at the other end of the collection tank 3's outlet pipe 4. The water distributor 5 ensures that the groundwater flows evenly into the permeable reaction pipes filled with packing material, thus achieving centralized purification of the groundwater. The permeable reaction pipes are composed of sections of permeable unit reaction pipes 6 connected together. The installation, removal, and replacement of the permeable unit reaction pipes 6 are not only very convenient, but their manufacturing is also highly flexible. Depending on the groundwater contamination level and control requirements, the packing material and pipe length of each section of the permeable unit reaction pipe 6 can be different. The packing material in each section of the permeable unit reaction tube 6 can be selected according to the wastewater conditions, including but not limited to the following: zero-valent iron, which can remove heavy metals (such as lead and mercury) and organic pollutants (such as chlorinated hydrocarbons) through oxidation-reduction reactions. Its strong reducing properties can destroy the molecular structure of pollutants, transforming them into harmless substances. Activated carbon, with its strong adsorption capacity, can adsorb volatile organic compounds (such as benzene compounds), and is particularly suitable for removing semi-volatile pollutants. Zeolite, with its porous structure, enhances physical interception and often works synergistically with microorganisms to remove pollutants. Other composite organic or inorganic materials can also be used for related wastewater treatment.
[0028] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.
Claims
1. A permeable reaction system for groundwater pollution remediation, characterized in that: It includes a pressure relief well, a water inlet pipe (2), a collection tank (3), a water distributor (5), and a permeable reaction pipe. The pressure relief well is connected to the collection tank (3) through the water inlet pipe (2). The collection tank (3) is connected to an outlet pipe (4). The outlet pipe (4) is connected to the water distributor (5). A flow control valve (9) is provided between the outlet pipe (4) and the water distributor (5). The water distributor (5) is connected to the permeable reaction pipe.
2. The permeable reaction system for groundwater pollution remediation according to claim 1, characterized in that: The decompression well includes a primary decompression well (1) and two secondary decompression wells (8) located on either side of it.
3. The permeable reaction system for groundwater pollution remediation according to claim 1, characterized in that: The permeable reaction tube is formed by connecting a permeable unit reaction tube (6) and a flange (7).
4. A permeable reaction system for groundwater pollution remediation according to claim 2, characterized in that: The primary decompression well (1) is located in the core area of the groundwater pollution plume, and the secondary decompression well (8) is located on both sides downstream of the primary decompression well (1), forming a triangular distribution with the primary decompression well (1).
5. A permeable reaction system for groundwater pollution remediation according to claim 1, characterized in that: The pressure relief well is 1.2 times the thickness of the aquifer, and the well wall is wrapped with 50-mesh filter cloth to prevent silt from entering.
6. A permeable reaction system for groundwater pollution remediation according to claim 1, characterized in that: The water distributor (5) is composed of a porous polyethylene pipe with a diameter of 100 mm and a length of 1 m, and it is distributed in a circular pattern along the pipe diameter.
7. A permeable reaction system for groundwater pollution remediation according to claim 3, characterized in that: The permeable unit reaction tube (6) has a length of 2-4m and a diameter of 1-2m.
8. A permeable reaction system for groundwater pollution remediation according to claim 3, characterized in that: The flange (7) is sealed with a rubber sealing ring and has a pressure resistance of ≥0.2MPa.