Automatic extraction device system suitable for groundwater remediation

Abstract

The invention discloses an automatic pumping device system for groundwater remediation, and belongs to the field of soil and groundwater remediation. The device system is composed of an underground water pumping well, a circulating water tank and a circulating water conveying pipeline, and water pumping under different water level conditions is controlled through automatic control of an electric control system. In the groundwater remediation and extraction treatment technology, after groundwater in a water-bearing layer is extracted through a pipeline pump, water pump conveying is kept in a circulating autorotation mode before the groundwater level of the water-bearing layer is recovered; and after the water level recovers to the target water level, the underground water is automatically pumped out. Through the circulating water tank and the electric control system, automatic pumping and repairing of underground water are achieved, frequent device starting and stopping caused by manual operation are reduced, and the pumping and repairing efficiency is improved through continuous pumping operation.

Description

Technical Field

[0001] This invention relates to the field of soil and groundwater remediation, and more particularly to an automatic groundwater remediation extraction device system. Background Technology

[0002] Pump-and-Treat (P&T) is a classic technology for ex-situ groundwater remediation. Its core principle is to extract contaminated groundwater from the aquifer to the surface through pumping wells, remove contaminants using physical, chemical, or biological processes, and then either reinject the water into the aquifer or discharge it after it meets standards, depending on the water quality. This technology is applicable to various pollution scenarios: when groundwater sources are contaminated with organic pollutants, heavy metals, or nutrients, especially in sandy sites with a clearly defined pollution plume and high hydraulic conductivity, it can quickly control the spread of pollution. Its advantages lie in its ability to rapidly reduce the concentration of contaminants in groundwater, and the treatment process can be flexibly adjusted according to the type of pollution, making it highly adaptable. Due to its high technological maturity and strong visibility of the treatment process, it is widely used in scenarios such as the remediation of industrial legacy sites, the treatment of leaks from underground oil tanks at gas stations, and the purification of agricultural non-point source pollution, becoming one of the most widely used technologies in groundwater remediation projects both domestically and internationally.

[0003] The process of groundwater extraction and treatment consists of three key steps: First, the deployment of the pumping system, which involves designing a group of pumping wells based on the aquifer thickness and the extent of contamination, and using submersible pumps or centrifugal pumps to control the pumping rate and avoid excessive pumping that could damage the aquifer structure; second, the surface treatment unit, which selects treatment processes based on the characteristics of the pollutants, typically using skid-mounted integrated water treatment equipment; and third, post-treatment disposal, where the treated water, after testing and finding that it meets the remediation targets, is either returned to the aquifer through reinjection wells or directly discharged into the municipal sewer network.

[0004] During on-site implementation, the most prominent problem was the frequent manual operation caused by intermittent pumping. Because the aquifer needs time to recover its water level after groundwater is extracted, and the recovery cycle fluctuates greatly depending on geological conditions and aquifer status, continuous pumping can easily lead to ground subsidence or a sudden drop in groundwater level. Therefore, an intermittent "pump-stop-recover-pump" mode is required. However, currently, in most cases, manual monitoring of the water level and manual switching of the pump are relied upon: on the one hand, this requires 24-hour shifts, resulting in high labor intensity and costs; on the other hand, the uncertainty of the water level recovery time easily leads to operational errors. If the recovery water is insufficient, starting the pump will cause it to run dry and damage the equipment; if the wait is too long, it reduces repair efficiency. Furthermore, manual operation at night or in remote locations is inconvenient, often causing interruptions in the process and further extending the repair cycle.

[0005] To address the aforementioned problems, this invention proposes an automatic groundwater extraction device system for groundwater remediation. This system achieves automatic groundwater extraction through a circulating water tank and an electrical control system. It automatically controls the extraction based on different water levels, enabling continuous automatic operation and increasing extraction and remediation efficiency. Summary of the Invention

[0006] The purpose of this invention is to address the deficiencies in the aforementioned background technology by proposing an automated groundwater remediation pumping system. This system comprises a groundwater extraction well, a circulating water tank, and a circulating water pipeline, which, along with an electronic control system, automatically controls the water level pumping under different conditions. This achieves automated groundwater pumping and remediation, reducing frequent manual start-ups and shutdowns, and increasing pumping efficiency through continuous operation.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0008] An automatic pumping device system for groundwater remediation, the system comprising:

[0009] Flow meter (1); Solenoid valve (2); Control box (3): Controls the opening and closing of each solenoid valve; Circulating water tank (4): Switches between two flow modes to achieve automatic water circulation when the water pump is powered on; Water inlet valve (5): In the initial state, fills the water tank with water to the liquid level to meet the start-up and shutdown of the pipeline pump and the transportation circulation; Flange interface (6): Float sensor installation and wiring installation port; Water inlet (7): Flange sealing connection, circulates water in the water tank through the pipeline; Level gauge (8); Float sensor (9): Senses the water level of the liquid surface and transmits an electrical signal to the control box; Water pipe (10): Transports the sewage from the aquifer in the pumping well to the water tank; Drain valve (11): Emptys the water in the water tank during maintenance or when finished; Check valve (12): Water in the water tank is in self-circulation state. Below, to prevent water in the tank from flowing back into the pumping well; water tank support (13); water pump support (14); pipeline pump (15); pumping well pipe (16): the well pipe within the aquifer area is screened, the rest of the position is sealed, wrapped with dense mesh and filled with quartz sand to increase water permeability and filtration; bottom plug of pumping well (17); top cover of pumping well (18); sieve plate (19), the pumped groundwater sewage is filtered through the sieve plate and then transported to the sewage treatment system or circulating water tank through pipeline; hardened ground (20); phreatic layer or underground hardened layer (21); aquifer (22): sewage extraction layer, the groundwater aquifer that needs to be repaired, the groundwater extraction and treatment technology repair mainly targets the continuous extraction of polluted groundwater in the aquifer to achieve the removal of pollutants; water-proof layer (23); water pipe outlet (24).

[0010] Furthermore, the extraction device system extracts the contaminated underground sewage from the aquifer to the circulating water tank (4), and then transports it to the sewage treatment system and the water tank for self-circulation via the water pipeline.

[0011] Furthermore, the water level in the circulating water tank (4) is kept stable. The water level is higher than the inlet and outlet of the pipeline pump when the pump is in operation. The pump is filled with liquid. When the impeller rotates, centrifugal force is generated to form a vacuum, which draws the liquid in the water tank and drives the sewage in the pumping well to be pumped out.

[0012] Furthermore, the top of the circulating water tank (4) has three openings. The first is the sewage automatic circulation pipeline delivery port, the second is the transmission line and inspection port, which is closed in the working state, and the third is the water tank inlet. Before the device system is started, clean water is injected into the tank. The water level is observed through the tank level gauge (8). The water level must reach above the water transmission pipeline and be above the inlet and outlet elevation of the water pump.

[0013] Furthermore, the bottom of the circulating water tank is provided with an opening, and the water supply pipe is connected by a flange seal. The water supply pipe is provided with a check valve (12) to prevent the water in the tank from being backflowed into the extraction well in the initial state and in the automatic circulation state.

[0014] Furthermore, a float sensor (9) is installed inside the circulating water tank, positioned above the outlet of the water supply pipe in the tank. At this point, when the liquid level in the tank drops below the float sensor... If the automatic pumping cycle continues, the pump will suck in air, causing the pipeline pump to malfunction. The float sensor will then send an electrical signal to shut down the entire pumping system.

[0015] Furthermore, a sieve plate (19) is provided at the bottom of the circulating water tank, and the sieve plate is arranged with... Fine-mesh stainless steel mesh, with an aperture diameter of [diameter value missing]. After groundwater is pumped from the extraction well and enters the water tank through the water pipeline, the silt and debris in the water pipeline are filtered through the screen plate. Then, the silt and debris in the tank are flushed out by opening the drain valve at the bottom of the water tank. The backwashing method involves connecting high-pressure clean water to the water inlet of the tank and directly flushing from the outside of the screen plate to the inside. The silt and impurities at the bottom of the tank and inside the screen plate are discharged through the drain port at the bottom of the tank.

[0016] Furthermore, the opening and closing of the solenoid valve (2) is controlled by the electrical signal of the float sensor (9) to achieve two different water flow modes. In the working state, groundwater is pumped out and the groundwater level drops continuously as the water is pumped out. In this working state, the water flow path is from the pumping well to the water tank, the pipeline pump, and the wastewater treatment system. The groundwater level drops continuously as the water is pumped out.

[0017] Furthermore, when the aquifer water level drops to water level 2, which includes the bottom of the aquifer, the pump power is constant and the return water rate in the pumping well is limited, so the groundwater in the pumping well cannot be replenished in time. At this time, when the float sensor (9-2) senses that the water level is below 2, it transmits an electrical signal to control the solenoid valve (2-2) to close and the solenoid valve (2-1) to open. In this working state, the water in the water delivery pipeline flows out from the outlet of the water tank delivery pipe and flows into the wellhead of the water tank delivery pipe through the pipeline pump, forming a self-circulating state in which the pump continues to operate.

[0018] Furthermore, when the water level in the pumping well recovers to water level 1, the float sensor (9-1) at the top of the aquifer at water level 1 senses the water level, transmits a signal to control the solenoid valve (2-2) to open, and the solenoid valve (2-1) to close, thus resuming the pumping of groundwater to be transported to the wastewater treatment system.

[0019] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0020] (1) The present invention provides an automatic pumping device system suitable for groundwater remediation. By adding a circulating water tank and an electrical control system, the pumping process is automated. Based on the directional pumping of the target water level of the aquifer, unnecessary pumping volume consumption is reduced.

[0021] (2) The present invention provides an automatic pumping device system suitable for groundwater remediation, which features automation, convenient installation and cyclic use, improves the remediation efficiency of groundwater pollution, reduces the workload of on-site operation and shortens the project remediation period.

[0022] (3) The present invention provides an automatic pumping device system suitable for groundwater remediation, which reduces the problem of frequent manual operation caused by intermittent pumping required on site. The system can automatically switch working modes according to the water level in the pumping well, realize the continuous operation of the pipeline pump, reduce the input of labor costs and the uncertainty of water level recovery, realize the continuous and uninterrupted groundwater pumping mode, and promote the development direction of groundwater remediation towards refinement, intelligence and sustainability. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the automatic extraction device system of the present invention;

[0024] Figure 2 This is a flowchart illustrating the operation process of the automatic extraction device system of the present invention.

[0025] 1-Flow meter, 2-Solenoid valve, 3-Control box, 4-Circulating water tank, 5-Water inlet valve, 6-Flange interface, 7-Water inlet pipe, 8-Level gauge, 9-Float sensor, 10-Water pipe, 11-Drain valve, 12-Check valve, 13-Water tank support, 14-Water pump support, 15-Pipeline pump, 16-Extraction well pipe, 7-Extraction well bottom plug, 18-Extraction well top cover, 19-Screen plate, 20-Hardened ground, 21-Burning layer or underground hardened layer, 22-Aquifer, 23-Imperile layer, 24-Water outlet pipe; Detailed Implementation

[0026] The technical solutions in the embodiments of the present invention will be further explained below with reference to the accompanying drawings.

[0027] like Figure 1 and Figure 2 As shown, an automatic pumping device system suitable for groundwater remediation is disclosed. The system includes:

[0028] Flow meter (1); Solenoid valve (2); Control box (3); Circulating water tank (4); Water inlet valve (5); Flange interface (6); Water pipe inlet (7); Level gauge (8); Float sensor (9); Water pipe (10); Drain valve (11); Check valve (12); Water tank support (13); Water pump support (14); Pipeline pump (15); Extraction well pipe (16); Bottom plug of extraction well (17); Top cover of extraction well (18); Screen plate (19); Hardened ground (20); Groundwater layer or underground hardened layer (21); Aquifer (22); Waterproof layer (23); Water pipe outlet (24).

[0029] Groundwater extraction and treatment mainly involves extracting groundwater from contaminated aquifers identified in the preliminary investigation, treating it through a surface treatment system, and then reinjecting or discharging it. Conventional methods involve drilling a well, then using submersible pumps or pipeline pumps to extract water. Once the water level drops to the bottom of the pipe, the pump is manually stopped, and pumping is restarted once the water level recovers.

[0030] The device system of this invention adds a circulating water tank and a circulating pipeline, and regulates the groundwater delivery method by automatically controlling the water level and valves. First, external water is added to the water inlet valve (5) of the circulating water tank until the water level in the tank is above the water outlet (24) of the water delivery pipe. After the pipeline pump is filled with water, the control box switch is activated to extract groundwater.

[0031] The water level in the extraction well is initially at a normal level. After the pumping starts, the water level in the groundwater aquifer forms a hydraulic funnel due to the pumping action, as shown in Figure 1. Groundwater continuously gathers into the extraction well and is pumped into the circulating water tank via the water pipeline. A sieve plate at the bottom of the tank filters impurities from the groundwater. The water is then pumped from the outlet (24) of the water tank's water pipeline by the pipeline pump and flows along the pipeline through the solenoid valve (2-2) to the wastewater treatment system. This is the first working mode.

[0032] As groundwater is continuously extracted, the water level in the extraction well drops. The aquifer water level reaches state 2. At this time, the float sensor 9-2 senses that the water level has dropped to the bottom of the aquifer and transmits a signal to the control box. In this state, solenoid valve 2-2 is closed and solenoid valve 2-1 is opened. The pipeline pump extracts water from the circulating water tank and then recharges it into the tank through the solenoid valve 2-1 passage, forming a closed-loop circulation. This is the second working mode.

[0033] When the water level in the pumping well returns to level 1, the float sensor 9-1 senses the water and transmits a signal to the control box. In this state, solenoid valve 2-2 opens and solenoid valve 2-1 closes. Water flows according to the first operating mode.

[0034] The valve automatically switches between two operating modes, achieving automated operation of the pumping system and avoiding frequent start-ups and shutdowns. This ensures continuous automatic operation without manual intervention. Simultaneously, the continuous operation of the pipeline pump reduces operational steps and extends pump lifespan.

[0035] Additionally, a float sensor 9-3 is installed in the circulating water tank, positioned above the liquid level at the outlet of the water tank's delivery pipe. In special circumstances such as insufficient water in the tank preventing timely delivery to the pipeline pump, air introduction, or leaks, the float sensor transmits a signal to the control box, automatically shutting down the water pump and simultaneously opening solenoid valves 2-1, 2-2, and 2-3. After draining the water from the tank through the drain valve (11), check the device's operating condition. Once the system is normal, restart the extraction device system following the initial steps.

[0036] This invention integrates an extraction well, pipeline pump, circulating water tank, circulating water pipeline, and electrical control device to form an automatic groundwater extraction system. This system uses sensors to automatically control the water delivery path under different water level conditions, achieving automatic groundwater extraction. In groundwater remediation and extraction technology, this reduces manpower input and on-site operational workload, improves the efficiency of groundwater pollution remediation, and shortens the project remediation period.

[0037] The above description is merely a preferred embodiment of the present invention and is not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An automatic pumping device system suitable for groundwater remediation, characterized in that, The system includes: Flow meter (1); Solenoid valve (2); Control box (3): Controls the opening and closing of each solenoid valve; Circulating water tank (4): Switches between two flow modes to achieve automatic water circulation when the water pump is powered on; Water inlet valve (5): In the initial state, fills the water tank with water to the liquid level to meet the start-up and shutdown of the pipeline pump and the transportation circulation; Flange interface (6): Float sensor installation and wiring installation port; Water inlet (7): Flange sealing connection, circulates water in the water tank through the pipeline; Level gauge (8); Float sensor (9): Senses the water level of the liquid surface and transmits an electrical signal to the control box; Water pipe (10): Transports the sewage from the aquifer in the pumping well to the water tank; Drain valve (11): Emptys the water in the water tank during maintenance or when finished; Check valve (12): Water in the water tank is in self-circulation state. Below, to prevent water in the tank from flowing back into the pumping well; water tank support (13); water pump support (14); pipeline pump (15); pumping well pipe (16): the well pipe within the aquifer area is screened, the rest of the position is sealed, wrapped with dense mesh and filled with quartz sand to increase water permeability and filtration; bottom plug of pumping well (17); top cover of pumping well (18); sieve plate (19), the pumped groundwater sewage is filtered through the sieve plate and then transported to the sewage treatment system or circulating water tank through pipeline; hardened ground (20); phreatic layer or underground hardened layer (21); aquifer (22): sewage extraction layer, the groundwater aquifer that needs to be repaired, the groundwater extraction and treatment technology repair mainly targets the continuous extraction of polluted groundwater in the aquifer to achieve the removal of pollutants; water-proof layer (23); water pipe outlet (24).

2. The automatic pumping device system for groundwater remediation according to claim 1, characterized in that, The extraction device system extracts the contaminated underground sewage from the aquifer to the circulating water tank (4), and then transports it to the sewage treatment system and the water tank for self-circulation via the water pipeline.

3. The automatic pumping device system for groundwater remediation according to claim 1, characterized in that, The water level in the circulating water tank (4) is kept stable. The water level is higher than the inlet and outlet of the pipeline pump when it is working. The pump is filled with liquid. When the impeller rotates, centrifugal force is generated to form a vacuum, which draws the liquid in the water tank and drives the sewage in the pumping well to be pumped out.

4. The automatic pumping device system for groundwater remediation according to claim 1, characterized in that, The top of the circulating water tank (4) has three openings. The first is the sewage automatic circulation pipeline delivery port, the second is the transmission line and inspection port, which is closed in the working state, and the third is the water tank inlet. Before the device system is started, clean water is injected into the tank. The water level is observed through the tank level gauge (8). The water level must reach above the water transmission pipeline and be above the inlet and outlet elevation of the water pump.

5. The automatic pumping device system for groundwater remediation according to claim 1, characterized in that, The bottom of the circulating water tank is provided with an opening, and the water supply pipe is connected by a flange seal. The water supply pipe is provided with a check valve (12) to prevent the water in the tank from being backflowed into the extraction well in the initial state and in the automatic circulation state.

6. The automatic pumping device system for groundwater remediation according to claim 1, characterized in that, The circulating water tank is equipped with a float sensor (9), which is located on the upper side of the water outlet of the tank body. At this point, when the liquid level in the tank drops below the float sensor... If the automatic pumping cycle continues, the pump will suck in air, causing the pipeline pump to malfunction. The float sensor will then send an electrical signal to shut down the entire pumping system.

7. The automatic pumping device system for groundwater remediation according to claim 1, characterized in that, The bottom of the circulating water tank is equipped with a sieve plate (19), on which are arranged... Fine-mesh stainless steel mesh, with an aperture diameter of [diameter value missing]. After groundwater is pumped from the extraction well and enters the water tank through the water pipeline, the silt and debris in the water pipeline are filtered through the screen plate. Then, the silt and debris in the tank are flushed out by opening the drain valve at the bottom of the water tank. The backwashing method involves connecting high-pressure clean water to the water inlet of the tank and directly flushing from the outside of the screen plate to the inside. The silt and impurities at the bottom of the tank and inside the screen plate are discharged through the drain port at the bottom of the tank.

8. The automatic pumping device system for groundwater remediation according to claim 1, characterized in that, The opening and closing of the solenoid valve (2) is controlled by the electrical signal of the float sensor (9) to achieve two different water flow modes. In the working state, groundwater is pumped out and the groundwater level continues to drop as the water is pumped out. In this working state, the water flow path is from the pumping well to the water tank, the pipeline pump, and the wastewater treatment system. The groundwater level continues to drop as the water is pumped out.

9. The automatic pumping device system for groundwater remediation according to claim 1, characterized in that, When the aquifer water level drops to water level 2, which includes the bottom of the aquifer, the pump power is constant and the return water rate in the pumping well is limited, so the groundwater in the pumping well cannot be replenished in time. At this time, when the float sensor (9-2) senses that the water level is below 2, it sends an electrical signal to control the solenoid valve (2-2) to close and the solenoid valve (2-1) to open. In this working state, the water in the water delivery pipeline flows out from the outlet of the water tank delivery pipe and flows into the wellhead of the water tank delivery pipe through the pipeline pump, forming a self-circulating state in which the pump continues to operate.

10. The automatic pumping device system for groundwater remediation according to claim 1, characterized in that, When the water level in the pumping well returns to water level 1, the float sensor (9-1) at the top of the aquifer at water level 1 senses the water level and transmits a signal to control the solenoid valve (2-2) to open and the solenoid valve (2-1) to close, thus resuming the pumping of groundwater to be transported to the wastewater treatment system.

Images