A shallow riverbank groundwater treatment system and method

Abstract

The present application provides a kind of shallow river groundwater treatment system and method.The shallow river groundwater treatment system includes water pool with water inlet area and water outlet area, and water conservancy regulating well set in the upstream of contaminated aquifer, there is permeable layer in underground soil layer, the water conservancy regulating well is located on the side wall of permeable layer and is provided with multiple water inlet holes, the water pool is located on the downstream side of water conservancy regulating well, and the water pool is located underground, the water conservancy regulating well is communicated with water inlet area by transmission pipe, the outside of the water pool is provided with water outlet weir communicated with water outlet area, the water outlet weir is communicated with downstream river by water outlet pipe;Multiple filler modules are provided in the water pool.The filler is designed as a module structure, combined with online monitoring equipment, the performance of filler module is accurately detected, timely replacement is realized, the repair effect is guaranteed, the activity of filler module is ensured, secondary pollution and blockage are avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of underground sewage treatment, and in particular to a shallow river-adjacent underground water treatment system and method. BACKGROUND

[0002] The permeable reactive barrier (PRB) technology is a new technology in the control technology for risk management of contaminated sites. Compared with other underground water pollution treatment technologies, the PRB technology has the advantages of low energy consumption, simple management, and long-term treatment of contaminated underground water, and is a green and sustainable pollution prevention and control technology. The PRB technology is divided into continuous type, funnel-water gate type, and injected reaction zone type according to the implementation mode. The funnel-water gate type PRB technology utilizes the water barrier to control and guide the underground water flow to remove the pollutants after the flow is collected through the PRB filler, and is suitable for treating sites with shallow underground water depth and large pollution plume size. However, the funnel-water gate type PRB technology disturbs the surface and stratum structure, and causes certain interference to the natural underground water flow field.

[0003] The PRB reaction filler used in the prior art has a whole structure, which is not conducive to replacement. When the pollutants flow through the active filler area along with the underground water, the activity of the filler gradually decreases with the reaction, the inactivated filler has a potential secondary pollution source to the underground water, and also causes the reaction filler to be blocked, and the pollution plume flows around the blocked reaction filler, so that the repair effect is difficult to guarantee.

[0004] A permeable reactive wall structure and a method for treating a pollution plume disclosed in the prior art patent publication CN113896273A collects and transports the underground water to the downstream permeable reactive wall for treatment by means of the terrain difference. The collection well passively collects water by means of the terrain difference, and the underground water penetrates into the underground stratum by means of the terrain difference. If the stratum permeability is poor, the drainage condition is not favorable, and the water level of the downstream may be higher than that of the upstream, resulting in poor treatment effect. SUMMARY

[0005] The present application aims to provide a shallow river-adjacent underground water treatment system and method, which modularly designs the filler, realizes long-lasting activity of the filler, is easy to replace, has high repair efficiency, and has long-lasting effect.

[0006] The technical scheme of the present application is: a shallow river-adjacent groundwater treatment system, comprising a pool with an inlet area and an outlet area, and a water conservancy regulating well arranged on the upstream of the contaminated aquifer, a permeable layer in the underground soil layer, a plurality of water inlet holes arranged on the side wall of the permeable layer of the water conservancy regulating well, the pool being arranged on the downstream side of the water conservancy regulating well and being arranged underground, the water conservancy regulating well being communicated with the inlet area through a transmission pipe, the outer side of the pool being provided with an outlet weir communicated with the outlet area, the outlet weir being communicated with the downstream river through an outlet pipe; a plurality of filler modules are arranged in the pool; the bottom and the two sides of the pool are provided with waterproof barriers, the waterproof barriers on the two sides being expanded and closed outside the water conservancy regulating well, and the waterproof barriers on the bottom and the two sides being vertically extended downward.

[0007] In the above scheme, the method for actively collecting contaminated groundwater to the water collecting well by means of the waterproof barriers arranged on both sides of the pollution plume and the lower side of the pool; in addition, the water conservancy regulating well of the present application not only collects contaminated groundwater, but also plays an important role in lifting the groundwater level, the waterproof barriers intercept the contaminated groundwater in the shallow permeable layer, so that the water level of the contaminated groundwater is raised and transported to the downstream pool treatment system by gravity; and the hydraulic conditions of the downstream pool are controllable, and the water in the pool is discharged through the outlet pipe, which creates favorable hydraulic conditions for the water conservancy regulating well on the upstream to lift the groundwater level.

[0008] Preferably, the transmission pipe is communicated with the water conservancy regulating well at the bottom of the pool; and the transmission pipe is buried underground at a depth lower than the pollution depth of the groundwater.

[0009] Preferably, the plurality of filler modules are arranged in a rectangular array in the pool; or the plurality of filler modules are divided into a plurality of column groups from upstream to downstream, and a plurality of filler modules are arranged in each column group.

[0010] Preferably, the inlet area and the outlet area are both provided with water distribution plates for providing stable hydraulic conditions for the filler modules.

[0011] Preferably, the water conservancy regulating well is cylindrical, the bottom of the water conservancy regulating well extends into the waterproof layer underground, and the top of the water conservancy regulating well is located above the ground.

[0012] The present application also provides a shallow river-adjacent groundwater treatment method, which is carried out by using the above-mentioned shallow river-adjacent groundwater treatment system, comprising:

[0013] Step one, the underground sewage enters the water conservancy regulating well from the permeable layer and the water inlet hole, so that the water level in the water conservancy regulating well rises; the water conservancy regulating well on the upstream and the pool on the downstream form a certain water level difference, when the sewage in the water conservancy regulating well flows into the inlet area from the transmission pipe at a certain outlet flow rate, the water level in the water conservancy regulating well is lower than the water level of the surrounding groundwater, which provides the unpowered driving of the water conservancy regulating well;

[0014] Step 2: After the wastewater is evenly distributed in the inlet area, it flows through the packing module for purification. The purified water is discharged from the outlet area to the outlet weir. The pollutant concentration of the purified water is detected at the outlet weir. If the pollutant concentration exceeds the standard limit, the water in the outlet weir is returned to the inlet area. If the pollutant concentration reaches the standard limit, the water in the outlet weir is discharged from the outlet pipe.

[0015] Step 3: After the water in the effluent weir flows back to the inlet area, the sampling pipe on each packing module is activated. Part of the water in the inlet area flows from its respective sampling pipe to the online monitoring equipment for testing. If the pollutant concentration of the sewage in a certain sampling pipe exceeds the standard limit, the corresponding packing module connected to that sampling pipe is replaced.

[0016] Step four: After the replacement is completed, the remaining water in the inlet area is flowed through the packing module again for purification and testing until the pollutant concentration reaches the standard limit before being discharged.

[0017] Preferably, the outflow rate of the hydraulic regulating well is calculated according to formula (1):

[0018]

[0019] In the formula: Q—water output of the hydraulic regulating well, unit: m³ 3 / d;

[0020] R—Radius of influence, unit: m;

[0021] r—radius of the outer layer of the filter in the hydraulic regulating well, in meters;

[0022] S—Water level drawdown, unit: m;

[0023] K—permeability coefficient, unit: m / d;

[0024] H—Aquifer thickness, unit: m.

[0025] Preferably, the service life of the packing module is calculated based on the residence time of water in the packing module, the inflow rate, and the saturation of the packing module. When the service life of the packing module is close to the theoretical service life, a portion of the water in the inlet area is introduced into the sampling pipe and sent to the online monitoring equipment for testing, while the other portion flows through the packing module for purification and testing.

[0026] Preferably, the water flowing out of the inlet area passes through multiple rows of packing modules in sequence to achieve step-by-step purification.

[0027] Compared with related technologies, the beneficial effects of the present invention are as follows:

[0028] I. Addressing the challenges of deep groundwater depth, large contamination plume, and the high excavation depth and installation cost of gate-type groundwater remediation basins (PRBs), this invention proposes a treatment system and method for shallow, riverside groundwater. For unconfined groundwater with a depth greater than 10 meters but less than 20 meters, a funnel-gate type PRB is employed. A hydraulic regulating well is installed upstream of the contaminated aquifer to collect the contaminated groundwater. The hydraulic regulating well is designed as a complete well, with its bottom inserted into an impermeable layer. Impermeable barriers are installed on both sides and downstream of the hydraulic regulating well. A water tank is located above the impermeable barriers, and the water is guided to the water tank through a transmission pipe, allowing all the contaminated groundwater to pass through the filler module. The filler module has a modular structure, ensuring long-lasting activity, easy replacement, high remediation efficiency, and sustained effectiveness. This invention significantly reduces site excavation and installation costs, shortens the cycle, and lowers treatment costs while ensuring remediation effectiveness. The entire system is a non-powered system, and the collection system allows for shallow excavation of the PRB water tank, minimizing disturbance to the geological structure and reducing interference with the natural groundwater flow field.

[0029] Second, this invention reduces the excavation depth of the PRB water tank, reduces excavation costs, minimizes disturbance to the geological structure, and reduces interference with the natural groundwater flow field. In actual repair, as long as the bottom of the hydraulic regulating well is below the impermeable layer, there is an impermeable barrier around the hydraulic regulating well, the depth of the transmission pipe of the hydraulic regulating well is lower than the pollution depth of the groundwater, and the outflow of the hydraulic regulating well is greater than the flow of the polluted groundwater, all the polluted groundwater can be collected into the well.

[0030] Third, this invention constructs a water tank underground, relying on gravity flow and water level difference to capture polluted groundwater. That is, the water tank is located downstream of the water regulating well, forming a certain water level difference with the upstream water regulating well. When the upstream water regulating well flows out polluted water at a certain outflow rate, the water level in the water regulating well drops. The groundwater level in the well at the same location is lower than the groundwater level around the well, thus providing a non-powered drive for the water regulating well. Polluted groundwater continuously flows out of the well, purifying the polluted groundwater, achieving non-powered drive, and reducing system processing and operating costs.

[0031] Fourth, the packing module, combined with online monitoring equipment, accurately detects the performance of the packing module, enabling timely replacement, ensuring the repair effect, maintaining the activity of the packing module, and avoiding secondary pollution and blockage. Attached Figure Description

[0032] Figure 1 A schematic diagram of the plan structure of the shallow riverside groundwater treatment system provided by the present invention;

[0033] Figure 2 For along Figure 1 AA section view diagram.

[0034] In the attached diagram: 1. Hydraulic regulating well; 2. Transmission pipe; 3. Water barrier; 4. Inlet area; 5. Water pool; 6. Outlet area; 7. Outlet weir; 8. Outlet pipe; 9. Packing module; 10. Water barrier layer; 11. Permeable layer. Detailed Implementation

[0035] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. For ease of description, the terms "upper," "lower," "left," and "right" used below only indicate that they correspond to the upper, lower, left, and right directions in the accompanying drawings and do not limit the structure.

[0036] Example 1

[0037] This invention is mainly used to solve the problem of shallow groundwater treatment near rivers. In this embodiment, for unconfined groundwater with a burial depth greater than 10 meters and less than 20 meters, a funnel-gate type PRB is used to remediate the contaminated groundwater through a collection system and modular PRB.

[0038] like Figure 1 , Figure 2 As shown, the shallow riverside groundwater treatment system provided in this embodiment includes a hydraulic regulating well 1, a transmission pipe 2, a water-impermeable barrier 3, an inlet area 4, a water tank 5, an outlet area 6, an outlet weir 7, an outlet pipe 8, and a packing module 9. The shallow riverside groundwater treatment system is located underground, and there is a permeable layer 11 and a water-impermeable layer 10 underground.

[0039] The hydraulic regulating well 1 is located upstream of the contaminated aquifer. It is a cylindrical well surrounded by a water-impermeable barrier 3. Water-impermeable barriers 3 are also provided at the bottom and on both sides of the water tank 5. The water-impermeable barriers 3 on both sides are flared and enclose the outside of the hydraulic regulating well 1, while the bottom and side water-impermeable barriers 3 extend vertically downwards. The lower end of the hydraulic regulating well 1 extends into the water-impermeable layer 10, and the hydraulic regulating well 1 has multiple inlet holes (not shown) on its sidewall in the permeable layer 11. This allows for the capture of deep contaminated groundwater, which is then transported to the water tank 5 via the transmission pipe 2.

[0040] The transmission pipe 2 is buried underground at a depth lower than the contamination depth B of the groundwater (e.g., Figure 2 As shown in the figure, the transmission pipe 2 is connected to the hydraulic regulating well 1 at the bottom of the water tank 5. The water barrier 3 is arranged vertically to block the migration and transport of polluted groundwater to the surrounding environment. It can be made of soil-bentonite water barrier, plain concrete water barrier, cement curtain grouting wall or geomembrane wall, etc.

[0041] The water tank 5 is built underground. The water tank 5 has an inlet area 4 on one side near the hydraulic regulating well 1 and an outlet area 6 on the other side. Multiple hydraulic regulating wells 1 are arranged along the length of the water tank 5. Both the inlet area 4 and the outlet area 6 are equipped with uniform water distribution plates to provide stable hydraulic conditions for the multiple packing modules 9 placed in the water tank 5, allowing polluted groundwater to flow evenly through the packing modules 9. The packing modules 9 are PRB packing.

[0042] The multiple packing modules 9 are arranged in a rectangular array within the water tank 5. Alternatively, the multiple packing modules 9 are divided into multiple longitudinal groups according to the upstream-to-downstream direction, with multiple packing modules 9 arranged in each longitudinal group (e.g., ...). Figure 1 As shown, there are 3 vertical rows, and each vertical row has 13 packing modules 9). The actual configuration of multiple packing modules 9 is related to ease of replacement.

[0043] The water tank 5 is located downstream of the water regulating well 1, forming a certain water level difference with the water level in the upstream water regulating well 1. When the water regulating well discharges a certain amount of polluted water, the water level in the well drops. The groundwater in the well at the same location is lower than the groundwater level around the well, providing a non-powered drive for the water regulating well. The polluted groundwater continuously flows out of the water regulating well 1 and is transmitted to the water tank 5 through the transmission pipe 2, where it is reacted and decontaminated by the packing module 9, thus purifying the polluted groundwater.

[0044] The outer side of the water tank 5 is provided with an outlet weir 7 that communicates with the outlet area 6. The outlet weir 7 is connected to the downstream river through an outlet pipe 8. The outlet weir 7 is equipped with online monitoring equipment and water quality testing equipment. The online monitoring equipment is used to monitor the activity of the packing module 9, and the water quality testing equipment is used to detect the concentration of pollutants in the water of the outlet weir 7.

[0045] Example 2

[0046] The present invention also provides a method for treating shallow riverside groundwater, which uses the above-mentioned shallow riverside groundwater treatment system and includes the following steps:

[0047] S1, underground sewage enters the hydraulic regulating well 1 from the inlet hole through the permeable layer 11 at a first flow rate, causing the water level in the hydraulic regulating well 1 to rise. A certain water level difference is formed between the upstream hydraulic regulating well 1 and the downstream water tank 5. When the sewage in the hydraulic regulating well 1 flows into the inlet area 4 from the transmission pipe 2 at a certain outflow rate, the water level in the hydraulic regulating well 1 is lower than the surrounding groundwater level, providing a non-powered drive for the hydraulic regulating well. The first flow rate is less than the outflow rate of the hydraulic regulating well 1.

[0048] The outflow rate of the water regulating well 1 is calculated according to formula (1):

[0049]

[0050] The radius of influence R, and its water calculation formula The water level in the hydraulic regulating well must be higher than the water level in the PRB.

[0051] In the formula: Q—water output of the hydraulic regulating well, unit: m³ 3 / d;

[0052] R—Radius of influence, unit: m;

[0053] r—radius of the outer layer of the filter in the hydraulic regulating well, in meters;

[0054] S—Water level drawdown, unit: m;

[0055] K—permeability coefficient, unit: m / d;

[0056] H—Aquifer thickness, in meters;

[0057] Refer to the appendix of the "Technical Specification for Wells" (GB 50296-2014).

[0058] Step two: After the wastewater is evenly distributed in the inlet zone 4, it flows through the packing module 9 for purification. The purified water is then discharged from the outlet zone 6 into the outlet weir 7. The purified water at the outlet weir 7 is then monitored for pollutant concentration using water quality monitoring equipment.

[0059] The water flowing out of the inlet zone 4 passes through multiple longitudinal groups of packing modules 9 to achieve step-by-step purification, so as to achieve the purpose of thorough purification.

[0060] Water quality testing equipment and online monitoring equipment operate on the same principle: online detection of heavy metal concentrations using anodic stripping voltammetry. The principle is as follows: First, an enrichment process is performed at a specific enrichment potential for a certain time, reducing metal ions in the water sample to metal and accumulating them on the working electrode. Then, an electrochemical analyzer scans the potential at a specific rate, recording the oxidation and dissolution peak current of the metal. Different peak current values ​​correspond to different metal concentrations. By controlling the enrichment potential, the metal is first reduced and then oxidized, resulting in corresponding peak currents. The determination of different metals is achieved by observing the differences in peak current values.

[0061] If the pollutant concentration exceeds the standard limit (heavy metal concentration in water reaches 0.5-0.8 times the standard limit), the water quality is considered unqualified. In this case, an emergency submersible pump (not shown) will be activated to return the water in the outlet weir 7 to the inlet area 4. If the pollutant concentration reaches the standard limit, the water quality is considered qualified, and the water in the outlet weir 7 will be discharged into the downstream river through the outlet pipe 8. The discharge standard is based on the local surface water environmental function and protection objectives, and complies with the "Surface Water Environmental Quality Standard GB3838-2002".

[0062] Step 3: After the water in the effluent weir 7 flows back to the inlet zone 4, the sampling pipe on each packing module 9 is activated. The inlet zone 4 is equipped with a gate. Activating the gate allows some of the water in the inlet zone 4 to flow from its respective sampling pipe to the online monitoring equipment for testing. If the pollutant concentration of the wastewater in a certain sampling pipe exceeds the standard limit, the corresponding packing module 9 connected to that sampling pipe is replaced.

[0063] In practice, a single online monitoring device can only monitor the sample from one sampling tube at a time. Therefore, a valve can be installed on the sampling tube of each packing module 9, and online monitoring of different modules at different times can be achieved by switching the valve. Alternatively, monitoring can be performed by column groups, such as three column groups corresponding to three online monitoring devices. If a non-compliance is found, the corresponding packing module 9 of that column group can be replaced.

[0064] Step four: After the replacement is completed, the gate is opened again to allow the remaining water in the inlet area 4 to flow through the packing module 9 for purification and testing until the pollutant concentration reaches the standard limit and then it is discharged.

[0065] In addition, the service life of the packing module 9 is calculated based on the water residence time in the packing module 9, the influent flow rate, and the saturation of the packing module 9. When the actual service life of the packing module 9 is shorter than the calculated theoretical service life, the online monitoring equipment does not need to be activated. When the actual service life of the packing module 9 is close to the theoretical service life, the purification process must be carried out simultaneously as follows: a portion of the water in the inlet zone 4 is introduced into the sampling pipe and sent to the online monitoring equipment for testing; the other portion flows through the packing module 9 for purification and is then tested by the water quality testing equipment. The online monitoring equipment is shut down when the service life of all packing modules 9 in the water tank 5 is shorter than the calculated theoretical service life.

[0066] Example 3

[0067] The site is approximately 2000m 2 The strata consist of miscellaneous fill, silty clay, fine sand, gravel, residual silty clay, and strongly weathered shale. The average permeability coefficient K is 5.30 m / d, and the aquifer thickness H is 13.0 m. Since the water level of regulating well 1 must be higher than that of pool 5, the burial depth of pool 5 is selected to be 4.0–5.0 m. Therefore, the drawdown S is 4.0 m, the radius of influence R is calculated to be 66.4 m, and r is taken as 0.2 m. The output Q of regulating well 1 is calculated to be 109.8 m³. 3 / d, by calculating the friction loss along the transmission pipe 2, the head loss of the packing module 9 (PRB reactive packing is replaceable, and the head loss is calculated based on clean filter media), the drop head of the outlet weir 7, and the friction loss along the outlet pipe 8, the total is approximately 1.0m to 1.5m, which enables the gravity flow of polluted water. After the purified groundwater passes online monitoring, it is discharged into the downstream river through the pipeline.

[0068] This patent proposes a method and system for treating shallow, riverside groundwater. For unconfined groundwater with a depth greater than 10 meters but less than 20 meters, a funnel-gate type PRB (Packaging Module) is used. A hydraulic regulating well is set up upstream of the contaminated aquifer to collect the contaminated groundwater. The hydraulic regulating well is a complete well with an impermeable layer at its bottom. Impermeable barriers are set on both sides and downstream of the hydraulic regulating well. The PRB is located above the impermeable barriers and is guided to the packing module through a transmission pipe, allowing all the contaminated groundwater to pass through the PRB, thus purifying the groundwater. After online monitoring confirms the purified groundwater meets the standards, it is discharged into the downstream river through a pipeline. The collection system allows for shallow PRB excavation, minimizing disturbance to the geological structure and reducing interference with the natural groundwater flow field.

[0069] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A shallow riverside groundwater treatment system, comprising a pool (5) having an inlet zone (4) and an outlet zone (6), wherein there is a permeable layer (11) in the underground soil layer, characterized in that, It also includes a hydraulic regulating well (1) located upstream of the polluted aquifer. The hydraulic regulating well (1) has multiple inlet holes on the side wall of the permeable layer (11). The water pool (5) is located downstream of the hydraulic regulating well (1) and is located underground. The hydraulic regulating well (1) is connected to the inlet area (4) through a transmission pipe (2). The outside of the water pool (5) is provided with an outlet weir (7) connected to the outlet area (6). The outlet weir (7) is connected to the downstream river through an outlet pipe (8). The water pool (5) is provided with multiple packing modules (9). The bottom and both sides of the water pool (5) are provided with water-proof barriers (3). The water-blocking barrier (3) on the side is flared and encloses the outside of the water-regulating well (1). The water-blocking barriers (3) on the bottom and both sides extend vertically downward. The multiple packing modules (9) are divided into multiple longitudinal groups in the direction from upstream to downstream. Multiple packing modules (9) are set in each longitudinal group. The bottom of the water-regulating well (1) extends into the underground water-blocking layer (10), and the top of the water-regulating well (1) is located on the ground. The outlet weir (7) is equipped with online monitoring equipment and water quality testing equipment. The online monitoring equipment is used to monitor the activity of the packing module (9), and the water quality testing equipment is used to detect the concentration of pollutants in the water of the outlet weir (7).

2. The shallow riverside groundwater treatment system according to claim 1, characterized in that, The transmission pipe (2) is connected to the water regulation well (1) at the bottom of the pool (5); the transmission pipe (2) is buried underground at a depth lower than the pollution depth of the groundwater.

3. The shallow riverside groundwater treatment system according to claim 1, characterized in that, Both the inlet zone (4) and the outlet zone (6) are equipped with water distribution plates to provide stable hydraulic conditions for the packing module (9).

4. The shallow riverside groundwater treatment system according to claim 1, characterized in that, The hydraulic regulating well (1) is cylindrical.

5. A method for treating shallow riverside groundwater, comprising using the shallow riverside groundwater treatment system as described in any one of claims 1-4, characterized in that, include: Step 1: Underground sewage enters the water regulation well (1) through the permeable layer (11) and the inlet hole, causing the water level in the water regulation well (1) to rise. The water regulation well (1) located upstream and the water pool (5) located downstream form a certain water level difference. When the sewage in the water regulation well (1) flows into the inlet area (4) from the transmission pipe (2) at a certain outflow rate, the water level in the water regulation well (1) is lower than the water level of the surrounding groundwater, providing the water regulation well with no power drive. Step 2: After the wastewater is evenly distributed in the inlet area (4), it flows through the packing module (9) for purification. The purified water is discharged from the outlet area (6) to the outlet weir (7). The purified water is tested for pollutant concentration in the outlet weir (7). If the pollutant concentration exceeds the standard limit, the water in the outlet weir (7) is returned to the inlet area (4). If the pollutant concentration reaches the standard limit, the water in the outlet weir (7) is discharged from the outlet pipe (8). Step 3: After the water in the outlet weir (7) flows back to the inlet area (4), the sampling pipe on each packing module (9) is activated. Part of the water in the inlet area (4) flows from its respective sampling pipe to the online monitoring equipment for detection. If the pollutant concentration of the sewage in a certain sampling pipe exceeds the standard limit, the corresponding packing module (9) connected to the sampling pipe is replaced. Step 4: After the replacement is completed, the remaining water in the inlet area (4) is flowed through the packing module (9) again for purification and testing until the pollutant concentration reaches the standard limit and then discharged.

6. The method for treating shallow riverside groundwater according to claim 5, characterized in that, The service life of the packing module (9) is calculated based on the residence time of water in the packing module (9), the inflow rate and the saturation of the packing module (9). When the service life of the packing module (9) is close to the theoretical service life, a portion of the water in the inlet area (4) is introduced into the sampling pipe and sent to the online monitoring equipment for testing, while the other portion flows through the packing module (9) for purification and testing.

7. The method for treating shallow riverside groundwater according to claim 5, characterized in that, The water flowing out of the inlet area (4) passes through multiple longitudinal groups of packing modules (9) to achieve step-by-step purification.

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