High-efficiency intelligent extraction equipment for light non-aqueous phase liquid in groundwater

Abstract

The present invention discloses an efficient and intelligent extraction device for light non-aqueous phase liquid in groundwater, comprising: an extraction well and an extraction control cabinet; the extraction control cabinet receives real-time liquid level and oil-water interface detection signals detected by an oil-water monitoring sensor; and when the real-time liquid level rises to a preset upper liquid level threshold, controls the submersible pump to start and the pumping pipe solenoid valve to open; when the oil-water interface detection signal indicates that the oil-water interface between the light non-aqueous phase liquid in the extraction well and the groundwater has dropped to the oil-water monitoring sensor, controls the submersible pump to start and the pumping pipe solenoid valve to open; and when the real-time liquid level drops to a preset lower liquid level threshold, controls the submersible pump to stop. The present invention can extract contaminated groundwater and light non-aqueous phase liquid separately through different pipelines and at different times, thereby automatically and accurately extracting the light non-aqueous phase liquid from the contaminated groundwater, thereby facilitating the resource utilization of both. The invention has the advantages of long-term operation, low cost, high work efficiency, and simple operation.

Description

Technical Field

[0001] This invention relates to groundwater extraction equipment, specifically a highly efficient and intelligent extraction device for light, non-aqueous liquids in groundwater. Background Technology

[0002] Environmental protection requirements in my country are becoming increasingly stringent. For light non-aqueous liquids (LNAPLs), such as petroleum, kerosene, and paraxylene, traditional groundwater extraction and treatment methods are costly. Summary of the Invention

[0003] The technical problem to be solved by this invention is to provide an efficient and intelligent pumping device for removing lightweight non-aqueous liquids from groundwater.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0005] A highly efficient and intelligent extraction device for lightweight non-aqueous liquids in groundwater, characterized in that it includes: an extraction well and an extraction control cabinet;

[0006] The extraction wells are constructed at the contaminated site and located in the oil-bearing area, with their layout determined by the contaminated area and the impact range of pumping. A submersible pump and an oil-water monitoring sensor are installed at the bottom of the extraction well, with the oil-water monitoring sensor positioned above the submersible pump. The outlet of the submersible pump is connected to the main inlet of a tee connector. The two branch outlets of the tee connector are connected to the lower ends of the water pumping pipe and the oil pumping pipe respectively via check valves. The upper end of the water pumping pipe extends beyond the extraction well and connects to the wastewater treatment equipment. The upper end of the oil pumping pipe extends beyond the extraction well and connects to the oil tank. The sections of the water pumping pipe and the oil pumping pipe outside the extraction well are respectively equipped with a water pumping pipe solenoid valve and an oil pumping pipe solenoid valve.

[0007] The submersible pump, oil-water monitoring sensor, water pumping pipe solenoid valve, and oil pumping pipe solenoid valve are electrically connected to the extraction control cabinet via communication cables, so that:

[0008] The extraction control cabinet receives real-time liquid level and oil-water interface detection signals from oil-water monitoring sensors. The real-time liquid level is the liquid level value within the extraction well, which can be measured using existing methods such as hydraulics. When the real-time liquid level rises to a preset upper limit threshold, the submersible pump is started, the water pipe solenoid valve is opened, and the oil pipe solenoid valve is closed to extract the contaminated groundwater from the extraction well to the wastewater treatment equipment. The real-time liquid level gradually decreases as the contaminated groundwater is extracted. The oil-water interface detection signal indicates that the oil-water interface between the light non-aqueous phase liquid (i.e., LNAPLs, generally petroleum, kerosene, paraxylene, etc.) and the groundwater in the extraction well has dropped to the oil level. When the water monitoring sensor is activated, the submersible pump is started, the water pumping pipe solenoid valve is closed, and the oil pumping pipe solenoid valve is opened to accurately extract the light non-aqueous liquid from the extraction well into the oil tank, starting from the oil-water interface. The real-time liquid level continues to gradually decrease as the light non-aqueous liquid is extracted. When the real-time liquid level drops to the preset lower limit threshold, the submersible pump is stopped. This allows the real-time liquid level in the extraction well to gradually rise as the contaminated groundwater and light non-aqueous liquid from the contaminated site enter the extraction well from the screen opening position, until it rises to the upper limit threshold. The aforementioned process is repeated, and this cycle is repeated to achieve the separate extraction of contaminated groundwater and light non-aqueous liquid from the contaminated site.

[0009] Therefore, this invention can extract contaminated groundwater and light non-aqueous liquids separately through different pipelines and at different times, so as to automatically and accurately remove the light non-aqueous liquids from the contaminated groundwater, so as to realize the resource utilization of both. It has the advantages of long-term operation, low cost, high efficiency and simple operation, and achieves efficient and accurate remediation and risk management of contaminated sites.

[0010] The upper and lower liquid level thresholds can be fixed values ​​or determined based on the thickness of the oil layer, the return rate, and the groundwater level of the light non-aqueous liquid. They can be adjusted as the oil layer thickness and water level change to maximize the extraction of contaminated groundwater and light non-aqueous liquid.

[0011] Preferably, the submersible pump is located at the bottom of the extraction well, and the oil-water monitoring sensor is positioned 0.5m above the inlet of the submersible pump. This is to avoid excessive disturbance caused by the oil-water monitoring sensor being too close to the inlet of the submersible pump, and to prevent emulsification from interfering with the oil-water interface sensing of the oil-water monitoring sensor, which would lead to inaccurate water level and oil layer monitoring data.

[0012] Preferably, the submersible pump is hoisted by steel wire rope to facilitate maintenance and replacement.

[0013] Preferably, the sections of the water pumping pipe and the oil pumping pipe located inside the extraction well and above the ground are all equipped with union joints to facilitate the maintenance and replacement of the water pumping pipe and the oil pumping pipe.

[0014] Preferably, the wellhead of the extraction well is equipped with a well cover, which has a water pumping hole, a sensor cable hole, a negative pressure gauge mounting hole, an oil pumping hole, and a submersible pump cable hole; wherein, the water pumping hole is for the water pumping pipe to pass through, the sensor cable hole is for the oil-water monitoring sensor cable to pass through, the negative pressure gauge mounting hole is for installing the negative pressure gauge, the oil pumping hole is for the oil pumping pipe to pass through, and the submersible pump cable hole is for the submersible pump cable to pass through.

[0015] Preferably, the portion of the extraction well above ground is connected to an extraction pipe to allow for the extraction of air from the contaminated site.

[0016] Preferably, the extraction control cabinet is equipped with a storage unit and a control panel. The storage unit is used to store the monitoring data obtained by the extraction control cabinet during the operation of the high-efficiency intelligent extraction equipment for download and use. The control panel is used for parameter setting and displaying monitoring data.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] This invention can extract contaminated groundwater and light non-aqueous liquids separately through different pipelines and at different times, so as to automatically and accurately remove the light non-aqueous liquids from the contaminated groundwater, thereby facilitating the resource utilization of both. It has the advantages of long-term operation, low cost, high efficiency and simple operation, achieving efficient and precise remediation and risk management of contaminated sites. Attached Figure Description

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments:

[0020] Figure 1 This is a schematic diagram of the structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the structure of the manhole cover in this invention. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the embodiments and accompanying drawings to help those skilled in the art better understand the inventive concept of the present invention. However, the scope of protection of the claims of the present invention is not limited to the following embodiments. For those skilled in the art, all other embodiments obtained without creative effort without departing from the inventive concept of the present invention are within the scope of protection of the present invention.

[0023] like Figure 1 and Figure 2 As shown, the present invention discloses a highly efficient and intelligent extraction equipment for lightweight non-aqueous liquids in groundwater, including: extraction well 1 and extraction control cabinet;

[0024] The extraction well 1 is constructed in the contaminated site and located in the oil-bearing area. The layout is based on the contaminated area of ​​the site and the range of impact of water pumping. A submersible pump 2 and an oil-water monitoring sensor 3 are installed at the bottom of the extraction well 1, with the oil-water monitoring sensor 3 located above the submersible pump 2. The outlet of the submersible pump 2 is connected to the main inlet of the tee connector 4. The two branch outlets of the tee connector 4 are connected to the lower end of the water pumping pipe 6 and the lower end of the oil pumping pipe 7 respectively through check valves 5. The upper end of the water pumping pipe 6 extends out of the extraction well 1 and is connected to the sewage treatment equipment. The upper end of the oil pumping pipe 7 extends out of the extraction well 1 and is connected to the oil tank. The sections of the water pumping pipe 6 and the oil pumping pipe 7 outside the extraction well 1 are respectively equipped with a water pumping pipe solenoid valve 8 and an oil pumping pipe solenoid valve 9.

[0025] The submersible pump 2, oil-water monitoring sensor 3, water pumping pipe solenoid valve 8, and oil pumping pipe solenoid valve 9 are electrically connected to the extraction control cabinet via communication cables, so that:

[0026] The extraction control cabinet receives real-time liquid level and oil-water interface detection signals monitored by the oil-water monitoring sensor 3. The real-time liquid level is the liquid level value in the extraction well 1, which can be measured by existing methods such as hydraulics. When the real-time liquid level rises to a preset upper limit threshold, the submersible pump 2 is started, the water pumping pipe solenoid valve 8 is opened, and the oil pumping pipe solenoid valve 9 is closed to extract the contaminated groundwater from the extraction well 1 to the wastewater treatment equipment. The real-time liquid level gradually decreases as the contaminated groundwater is extracted. The oil-water interface detection signal indicates that the oil-water interface between the light non-aqueous phase liquid (i.e., LNAPLs, generally petroleum, kerosene, paraxylene, etc.) and the groundwater in the extraction well 1 has dropped to the oil level. When the water monitoring sensor 3 is activated, the submersible pump 2 is started, the water pumping pipe solenoid valve 8 is closed, and the oil pumping pipe solenoid valve 9 is opened to accurately extract the light non-aqueous liquid from the extraction well 1 to the oil tank starting from the oil-water interface. The real-time liquid level continues to gradually decrease as the light non-aqueous liquid is extracted. When the real-time liquid level drops to the preset lower limit liquid level threshold, the submersible pump 2 is stopped. This allows the real-time liquid level in the extraction well 1 to gradually rise as the contaminated groundwater and light non-aqueous liquid from the contaminated site enter the extraction well 1 from the screen opening position. When the real-time liquid level rises to the upper limit liquid level threshold, the above process is repeated. This cycle is repeated to achieve the separate extraction of contaminated groundwater and light non-aqueous liquid from the contaminated site.

[0027] Therefore, this invention can extract contaminated groundwater and light non-aqueous liquids separately through different pipelines and at different times, so as to automatically and accurately remove the light non-aqueous liquids from the contaminated groundwater, so as to realize the resource utilization of both. It has the advantages of long-term operation, low cost, high efficiency and simple operation, and achieves efficient and accurate remediation and risk management of contaminated sites.

[0028] The upper and lower liquid level thresholds can be fixed values ​​or determined based on the thickness of the oil layer, the return rate, and the groundwater level of the light non-aqueous liquid. They can be adjusted as the oil layer thickness and water level change to maximize the extraction of contaminated groundwater and light non-aqueous liquid.

[0029] The above are the basic embodiments of the present invention, and further optimizations, improvements and limitations can be made based on these basic embodiments:

[0030] Preferably, the submersible pump 2 is located at the bottom of the extraction well 1, and the oil-water monitoring sensor 3 is positioned 0.5m above the inlet of the submersible pump 2. This is to avoid excessive disturbance caused by the oil-water monitoring sensor 3 being too close to the inlet of the submersible pump 2, and to prevent emulsification from interfering with the sensing of the oil-water interface by the oil-water monitoring sensor 3, which would lead to inaccurate water level and oil layer monitoring data.

[0031] Preferably, the submersible pump 2 is hoisted by steel wire rope to facilitate maintenance and replacement.

[0032] Preferably, the sections of the water pumping pipe 6 and the oil pumping pipe 7 located inside the extraction well 1 and above the ground surface FL are equipped with union joints 10 to facilitate the maintenance and replacement of the water pumping pipe 6 and the oil pumping pipe 7.

[0033] Preferably, the wellhead of the extraction well 1 is equipped with a well cover 1-1, which has a water pumping hole 1-1a, a sensor cable hole 1-1b, a negative pressure gauge mounting hole 1-1c, an oil pumping hole 1-1d, and a submersible pump cable hole 1-1e. The water pumping hole 1-1a is for the water pumping pipe 6 to pass through, the sensor cable hole 1-1b is for the cable of the oil-water monitoring sensor 3 to pass through, the negative pressure gauge mounting hole 1-1c is for installing a negative pressure gauge, the oil pumping hole 1-1d is for the oil pumping pipe 7 to pass through, and the submersible pump cable hole 1-1e is for the cable of the submersible pump 2 to pass through.

[0034] Preferably, the portion of the extraction well 1 located above ground level FL is connected to an extraction pipe 11 to allow for extraction treatment of the contaminated site.

[0035] Preferably, the extraction control cabinet is equipped with a storage unit and a control panel. The storage unit is used to store the monitoring data obtained by the extraction control cabinet during the operation of the high-efficiency intelligent extraction equipment for download and use. The control panel is used for parameter setting and displaying monitoring data.

[0036] in addition:

[0037] The depth of the extraction well 1 is preferably 0.5m greater than the contamination depth of the contaminated site; the screen opening position of the extraction well 1 corresponds to the aquifer thickness of the contaminated site. The diameter of the extraction well 1 is preferably 110mm, the head height is preferably 0.5m, the platform height is preferably 0.15m, and both length and width are preferably 0.5m. The extraction well 1 is preferably constructed by drilling a hole with a single diameter to the bottom; the screen opening range is preferably 0.3-5.5m, each screen slot is 46cm long, 0.5mm wide, and the slot spacing is 3mm, with 6 cuts, and an internal plug is provided at the bottom of the well pipe.

[0038] The bottom of the extraction well 1 is preferably provided with a sand settling pipe with a diameter of 0.5m, and the submersible pump 2 is located on the sand settling pipe.

[0039] The tee connector 4 is preferably a U-shaped tee connector.

[0040] The water extraction pipe 6 and the oil extraction pipe 7 are preferably made of stainless steel with a diameter of 20 mm.

[0041] The extraction control cabinet is preferably controlled by a PLC. The extraction control cabinet can also transmit data with the DCS bus host computer using communication protocols such as Modbus and Profibus, and can achieve remote control and monitoring with industrial control computers, Ethernet, etc.

[0042] The sensing data from the oil-water monitoring sensor 3 can also be used to monitor the oil layer thickness. That is, when the oil-water monitoring sensor 3 senses the oil-water interface, the liquid level data detected can be converted into the density of the aqueous phase and the LNAPL phase to obtain the real-time oil layer thickness of the light non-aqueous liquid in the groundwater.

[0043] This invention is not limited to the specific embodiments described above. Based on the above content and in accordance with common technical knowledge and conventional methods in the field, without departing from the basic technical concept of this invention, this invention can also make other equivalent modifications, substitutions or alterations, all of which fall within the protection scope of this invention.

Claims

1. A highly efficient and intelligent pumping device for removing lightweight non-aqueous liquids from groundwater, characterized in that, include: Extraction well (1) and extraction control cabinet; The extraction well (1) is built on the contaminated site. A submersible pump (2) and an oil-water monitoring sensor (3) are installed at the bottom of the extraction well (1). The oil-water monitoring sensor (3) is located above the submersible pump (2). The outlet of the submersible pump (2) is connected to the main inlet of the tee connector (4). The two branch outlets of the tee connector (4) are connected to the lower end of the water pumping pipe (6) and the lower end of the oil pumping pipe (7) respectively through check valves (5). The upper end of the water pumping pipe (6) extends out of the extraction well (1) and is connected to the sewage treatment equipment. The upper end of the oil pumping pipe (7) extends out of the extraction well (1) and is connected to the oil tank. The sections of the water pumping pipe (6) and the oil pumping pipe (7) outside the extraction well (1) are respectively equipped with a water pumping pipe solenoid valve (8) and an oil pumping pipe solenoid valve (9). The submersible pump (2), oil-water monitoring sensor (3), water pumping pipe solenoid valve (8), and oil pumping pipe solenoid valve (9) are electrically connected to the extraction control cabinet, so that: The extraction control cabinet receives real-time liquid level and oil-water interface detection signals monitored by the oil-water monitoring sensor (3), wherein the real-time liquid level is the liquid level value in the extraction well (1); and when the real-time liquid level rises to the preset upper limit liquid level threshold, the submersible pump (2) is started, the water pumping pipe solenoid valve (8) is opened, and the oil pumping pipe solenoid valve (9) is closed; when the oil-water interface detection signal indicates that the oil-water interface between the light non-aqueous phase liquid and groundwater in the extraction well (1) has dropped to the oil-water monitoring sensor (3), the submersible pump (2) is started, the water pumping pipe solenoid valve (8) is closed, and the oil pumping pipe solenoid valve (9) is opened; when the real-time liquid level drops to the preset lower limit liquid level threshold, the submersible pump (2) is stopped.

2. The efficient and intelligent pumping equipment for removing light non-aqueous liquids from groundwater according to claim 1, characterized in that: The submersible pump (2) is located at the bottom of the extraction well (1), and the oil-water monitoring sensor (3) is installed 0.5m above the inlet of the submersible pump (2).

3. The efficient and intelligent pumping equipment for removing light non-aqueous liquids from groundwater according to claim 1 or 2, characterized in that: The submersible pump (2) is hoisted by steel wire rope.

4. The efficient and intelligent pumping equipment for removing light non-aqueous liquids from groundwater according to claim 1 or 2, characterized in that: The water pumping pipe (6) and oil pumping pipe (7) are located in the extraction well (1) and above the ground (FL), and both are equipped with union joints (10).

5. The efficient and intelligent pumping equipment for removing light non-aqueous liquids from groundwater according to claim 1 or 2, characterized in that: The wellhead of the extraction well (1) is equipped with a well cover (1-1), which has a water pumping hole (1-1a), a sensor cable hole (1-1b), a negative pressure gauge mounting hole (1-1c), an oil pumping hole (1-1d), and a submersible pump cable hole (1-1e).

6. The efficient and intelligent pumping equipment for removing light non-aqueous liquids from groundwater according to claim 1 or 2, characterized in that: The portion of the extraction well (1) above the ground (FL) is connected to the extraction pipe (11).

7. The efficient and intelligent pumping equipment for removing light non-aqueous liquids from groundwater according to claim 1 or 2, characterized in that: The extraction control cabinet is equipped with a storage unit and a control panel. The storage unit is used to store the monitoring data obtained by the extraction control cabinet during the operation of the high-efficiency intelligent extraction equipment, and the control panel is used to set parameters and display the monitoring data.

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