A contaminated groundwater remediation device

Abstract

A groundwater remediation device employs a multi-reaction unit progressive integrated design, including a water collection and filtration unit, a wastewater remediation unit, an effluent sedimentation unit, an online monitoring system, and a control system. The water collection and filtration unit guides, filters, automatically monitors, and extracts the incoming water. The wastewater remediation unit purifies and removes pollutants from the incoming water using remediation materials. The effluent sedimentation unit performs staged sedimentation of the reacted groundwater, increasing sedimentation time through baffle plates. Simultaneously, extraction pumps are installed in both the water collection and filtration unit and the effluent sedimentation unit to periodically remove filtered sediment, preventing clogging of the device. This invention also provides a method for remediating groundwater using the aforementioned buried modular remediation device. The integrated modular device of this invention does not occupy above-ground space, the ground cage module design is easy to install and replace, and the material combination methods are diverse, greatly improving remediation efficiency.

Description

Technical Field

[0001] This invention belongs to the field of groundwater remediation technology and relates to a modular remediation device for contaminated groundwater.

[0002] The present invention also relates to a method for remediating contaminated groundwater using the above-mentioned buried modular remediation device. Background Technology

[0003] Groundwater pollution is generally characterized by its concealment, delayed effects, complexity, uncertainty, and difficulty in remediation, making pollution prevention and remediation challenging. Groundwater remediation has become a major environmental issue of public and societal concern. Groundwater remediation refers to the gradual restoration of contaminated groundwater quality using technologies such as extraction, airlift, bioremediation, and permeable reactive barriers. Existing in-situ groundwater remediation equipment is mostly based on injectable remediation agents, either through drill pipe injection or injection wells. These devices are costly to manufacture and lack versatility. Meanwhile, ex-situ groundwater remediation devices generally suffer from drawbacks such as large surface area requirements, high daily maintenance costs, and complex processes. Therefore, there is an urgent need to improve and innovate a new, economical, and efficient groundwater pollution remediation device. Summary of the Invention

[0004] The purpose of this invention is to provide a buried modular remediation equipment for the remediation of contaminated groundwater. By integrating a water collection and filtration unit, a filler repair unit, an effluent settling unit, an online monitoring system, and a control system, the modular design of the filler repair unit greatly reduces the footprint of the remediation device, improves the reactivity and water conductivity of the materials, and makes the filling and replacement of the filler more convenient and efficient.

[0005] Another objective of this invention is to provide a method for remediating contaminated groundwater using the aforementioned underground modular remediation device.

[0006] To achieve the above objectives, the contaminated groundwater remediation equipment provided by the present invention adopts a multi-reaction unit progressive integrated design. The two sides of the contaminated groundwater remediation equipment are a water collection and filtration unit and an effluent sedimentation unit, respectively, and the middle of the water collection and filtration unit and the effluent sedimentation unit is a packing material remediation unit.

[0007] The contaminated groundwater remediation equipment is equipped with an online monitoring and control system;

[0008] in:

[0009] The water collection and filtration unit includes a water inlet, a No. 1 baffle plate, a No. 2 baffle plate, an inlet filter screen, an automatic submersible pump, and a liquid level monitoring probe;

[0010] The water inlet is located at the top of one side of the water collection and filtration unit. Baffles #1 and #2 are set parallel to each other and perpendicular to each other below the water inlet. Baffle #1 is higher than baffle #2. The water inlet filter screen is located on the upper part of baffle #2.

[0011] The influent online multi-parameter monitoring probe and the liquid level monitoring probe of the online monitoring system are set at the same height;

[0012] The control system is connected to the automatic submersible pump;

[0013] The water collection and filtration unit is equipped with a filter media extraction hole and an extraction pump at the top;

[0014] The effluent settling unit includes a No. 3 baffle plate, a No. 4 baffle plate, an effluent filter screen, an online multi-parameter monitoring device probe, and an effluent outlet;

[0015] The outlet is located at the bottom of the outlet settling unit. Baffles #3 and #4 are arranged parallel to each other and perpendicular to each other above the outlet. Baffle #3 is higher than baffle #4. The outlet filter screen is located on the upper part of baffle #4.

[0016] The probe of the online multi-parameter monitoring device for the effluent of the online monitoring system is set at the end of the effluent sedimentation unit, in the upper region of the effluent outlet, and its height is no higher than h / 2, where h is the height of the contaminated groundwater remediation device.

[0017] The upper part of the effluent sedimentation unit is equipped with a filter media extraction hole and an extraction pump;

[0018] The filler repair unit includes an inlet pipe, a funnel-shaped regulating area, a modular ground cage area, and an outlet overflow area.

[0019] The water inlet pipe is connected to the packing repair unit. The outlet of the water inlet pipe is horizontally connected to the funnel-shaped adjustment area and is flush with the side of the funnel-shaped adjustment area. The inlet of the water inlet pipe is connected to the outlet of the automatic submersible pump.

[0020] The modular cage area is a region formed by layering cages filled with active material, and the upper part of the funnel-shaped adjustment area is connected to the lower part of the modular cage area.

[0021] The overflow area is located above the modular ground cage area and is connected to the water outlet settling unit.

[0022] In the aforementioned groundwater remediation equipment, the height h1 of the No. 1 baffle plate is set to h / 2. ​

[0023] In the aforementioned contaminated groundwater remediation equipment, the height of the influent online multi-parameter monitoring device probe and the liquid level monitoring probe is not less than h / 2, where h is the height of the contaminated groundwater remediation equipment.

[0024] In the aforementioned contaminated groundwater remediation equipment, the height of the probe of the online multi-parameter monitoring equipment for effluent is no higher than h / 2, where h is the height of the contaminated groundwater remediation equipment.

[0025] The aforementioned groundwater remediation equipment includes a funnel-shaped regulating zone with a maximum distance of h / 6-h / 3cm at the bottom and a modular cage zone with a height of h / 3-2h / 3cm, where h is the height of the groundwater remediation equipment. The bottom of the modular cage zone is designed with a removable silicone pad. The upper single-layer cage module of the modular cage zone is made of a stainless steel welded square frame wrapped with 10-30 mesh stainless steel mesh. The height of the single-layer cage frame is set to 1-10cm, and the number of small cages inside the single-layer cage frame is 20-100.

[0026] The present invention provides a method for remediation using contaminated groundwater remediation equipment:

[0027] The contaminated groundwater enters the water collection and filtration unit of the remediation equipment through an inlet using an upflow and overflow method. A baffle plate reduces the impact force of the water flow, allowing the water to flow slowly through the inlet filter screen and into the online monitoring probe and automatic submersible pump. The control system records multiple parameters of the incoming water and changes in the water level. When the water level float of the automatic submersible pump is stable at the set height, the submersible pump will automatically start to regulate the flow rate; when the water level float of the automatic submersible pump does not meet the set height, the submersible pump will automatically shut down.

[0028] The water from the water collection and filtration unit is pumped into the funnel-shaped regulating tank in the packing repair unit. The water flow is regulated to be upward and enters the modular cage area for treatment. The treated water enters the effluent sedimentation unit through the effluent overflow area. After being guided by the baffle plate, it settles naturally and is monitored online by the probe of the online multi-parameter monitoring equipment. The online monitoring system records multiple parameters of the effluent before it is discharged from the repair equipment.

[0029] The method wherein the filtered material is extracted through the filter media extraction holes at the top of the water collection and filtration unit and the top of the water outlet sedimentation unit.

[0030] The method wherein the active material filling the modular cage area is a combination of different active materials according to the groundwater pollutants and treatment process requirements.

[0031] The method wherein the active material is a combination of persulfate and oxalic acid-modified zero-valent iron.

[0032] The advantages of this invention are:

[0033] (1) The present invention adopts a buried design, which does not occupy surface space and has the characteristics of small underground space occupation. At the same time, the surface space above the device can be used for greening or parking.

[0034] (2) The present invention adopts an integrated design, which is easy to install and operate, simple to operate, low operating cost, efficient repair, and can be reused.

[0035] (3) The repair material filling of the present invention adopts a modular design of ground cage, which is easy to install and replace, which helps to reduce the resistance of sewage when passing through the filling material, improve the repair efficiency, and reduce the operation and maintenance costs. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the groundwater remediation equipment of the present invention.

[0037] The components are as follows: 1-Water collection and filtration unit, 2-Packaging repair unit, 3-Outlet water settling unit, 4-Online monitoring system, 5-Control system, 11-Inlet, 12-No. 1 baffle, 13-No. 2 baffle, 14-Inlet online multi-parameter monitoring probe, 15-Inlet filter screen, 16-Automatic submersible pump, 17-Inlet pipe, 18-Liquid level monitoring probe, 191-Leakage extraction hole of water collection and filtration unit, 192-Leakage extraction pump of water collection and filtration unit, 21-Funnel-type regulating area, 22-Modular ground cage area, 23-Outlet overflow area, 31-No. 3 baffle, 32-No. 4 baffle, 33-Outlet filter screen, 34-Outlet online multi-parameter monitoring probe, 35-Outlet, 361-Leakage extraction hole of outlet settling unit, 362-Leakage extraction pump of outlet settling unit. Detailed Implementation

[0038] This invention relates to a buried modular remediation device for contaminated groundwater, employing a multi-reaction unit progressive integrated design, including a water collection and filtration unit 1, a packing material remediation unit 2, an effluent settling unit 3, an online monitoring system 4, and a control system 5, wherein:

[0039] The water collection and filtration unit 1 includes a baffle plate, a filter screen 15, an online multi-parameter monitoring device 14, and an automatic submersible pump 16. The water collection and filtration unit has two baffle plates, and the height h1 of baffle plate 12 (#1) is set to h / 2.

[0040] ​The packing repair unit 2 includes a water inlet pipe 17, a funnel-shaped adjustment area 21, a modular cage area 22 and an effluent overflow area 23, and adopts the way of upward water inlet and overflow effluent. The diameter of the water inlet pipe 17 is 20-40 mm, and the material is preferably a PE pipe, which is horizontally connected to the funnel-shaped adjustment area, and the outlet of the water inlet pipe is flush with the side of the adjustment area. The funnel-shaped adjustment area 21 is a funnel-shaped area, the maximum distance at the bottom of the funnel is set to h / 6 - h / 3 cm, and the upper part of the funnel area is connected to the cage area. The modular cage area is an area formed by stacking cages filled with active materials layer by layer. The height of the area is set to h / 3 - 2h / 3 cm, and the bottom periphery is designed with a detachable silica gel cushion layer to avoid dominant flow on the side. The upper single-layer cage module is designed with a square skeleton welded by stainless steel and wrapped with a stainless steel mesh of 10-30 meshes. The height of the single-layer skeleton is set to 1-10 cm, and the number of small cages inside the single-layer skeleton is 20-100. The modular cage can be filled with different active materials according to the needs of groundwater pollutants and treatment processes, with simple and convenient operation and flexible and diverse technical processes. The effluent overflow area is located above the modular cage area and is connected to the effluent sedimentation unit, and the height is set to h / 6 - h / 3 cm. The treatment capacity of the cage can be flexibly filled with material combinations according to the needs, which can improve the continuity of treatment. The effluent sedimentation unit 3 includes a baffle, a filter screen 33, an online multi-parameter monitoring device 34 and an outlet 35, etc. The baffles of the effluent sedimentation unit are set to 2. The height h3 of the 3# baffle 31 is set to h / 6 < h3 < h / 2, which can reduce the impact force of the effluent to the greatest extent and make the effluent slowly flow into the effluent sedimentation area; the height h4 of the 4# baffle 32 is set to h / 2 < h4 < 2h / 3, which can increase the depth diversion to the greatest extent and increase the sedimentation time of particulate matter. At the same time, a filter material extraction hole is provided at the upper part of the effluent sedimentation unit to regularly extract the filtered substances. The probe 34 of the online multi-parameter monitoring device of the effluent sedimentation unit 3 is arranged at the end of the effluent sedimentation unit, in the upper area of the outlet 35, and the height is not higher than h / 2. The diameter of the outlet is 30-50 mm, and the material is preferably a PE pipe.

[0041] The method for repairing contaminated groundwater by using the above-mentioned buried modular repair device provided by the present invention is as follows:

[0042] Polluted groundwater enters the modular unit through the inlet. The baffle plate minimizes the impact of the water flow, allowing it to slowly flow through the filter screen and into the online monitoring probe and automatic submersible pump. The system records multiple parameters of the incoming water and changes in water level. If the float of the automatic submersible pump remains stable at the set height, the pump automatically starts, and the flow rate is adjusted via the controller. If the float does not meet the set height, the pump automatically shuts off. The water from the collection and filtration unit is pumped into the funnel-shaped regulating tank in the packing repair unit, where the water flow is adjusted to an upward flow into the modular cage area for treatment. The treated water then flows through the overflow area into the effluent settling unit. Guided by the baffle plate, it settles naturally and enters the effluent online monitoring area, where the system records multiple effluent parameters before discharge.

[0043] Example 1

[0044] A rectangular area is excavated from the ground, and the device is buried in this area to remediate the extracted groundwater.

[0045] In this embodiment, the invented underground modular repair device is rectangular in shape, with dimensions of 110cm × 80cm × 70cm. The water collection and filtration unit is 30cm × 80cm × 70cm, the packing repair unit is 60cm × 80cm × 70cm, and the effluent settling unit is 20cm × 80cm × 70cm. The water collection and filtration unit has two baffles: baffle 12 (height h1) is 42cm, and the filter screen 15, made of 20-mesh stainless steel, is positioned above baffle 2 (height h2) at 45cm. The multi-parameter monitoring probe 14 and the liquid level monitoring probe 18 are both 50cm high. The packing repair unit 2 includes an inlet pipe 17, a funnel-shaped regulating area 21, a modular ground cage area 22, and an overflow area 23, employing an upward-flow inlet and an overflow outlet. The inlet pipe 17 has a diameter of 30mm and is made of PE pipe. It is horizontally connected to the funnel-shaped regulating zone, with the outlet of the inlet pipe flush with the side of the regulating zone. The funnel-shaped regulating zone 21 is a funnel-shaped area with a maximum distance of 12cm between the bottoms of the funnels. The upper part of the funnel area connects to the base cage area. The modular base cage area is a layered structure filled with active material, with a height of 45cm. The bottom is surrounded by a removable silicone pad to avoid lateral flow. The upper single-layer base cage module uses a stainless steel welded square frame wrapped with 20-mesh stainless steel mesh. The height of the single-layer frame is 9cm, and each single-layer frame contains 25 small base cages. The overflow area is located above the modular base cage area and connects to the outlet settling unit, with a height of 13cm.

[0046] The effluent settling unit 3 includes a baffle plate, a filter screen 33, an online multi-parameter monitoring device 34, and an outlet 35. The effluent settling unit has two baffles: baffle 31 (height h3) is 30cm, and baffle 4 (height h4) is 45cm, maximizing the depth of flow guidance and increasing the settling time of particulate matter. A filter media extraction hole is also provided at the top of the effluent settling unit for periodic removal of filtered material. The online multi-parameter monitoring device probe 34 is located at the end of the effluent settling unit, above the outlet, at a height of 30cm. The outlet pipe diameter is 40mm, and the material is plastic.

[0047] The groundwater at the petrochemical site is mainly found in silty clay at a depth of 5.1-19.5m, and is continuously distributed. The characteristic pollutants in the groundwater of this site are methyl tert-butyl ether (MTBE) and arsenic. The detected concentrations of MTBE in the groundwater range from 52.3 to 179 μg / L, and the detected concentrations of arsenic range from 21.75 to 78.3 mg / L.

[0048] In this embodiment, persulfate and oxalic acid-modified zero-valent iron were selected as the filling materials for the semi-underground modular remediation device of this invention. The filling materials were modularly packed, and after 3 months of operation, the treated groundwater volume was 2700 m³. 3 The concentrations of methyl tert-butyl ether and arsenic in the effluent of the semi-underground modular remediation device of the present invention are reduced to 17.9 μg / L and 8.7 μg / L, respectively.

Claims

1. A groundwater remediation device, which adopts a multi-reaction unit progressive integrated design, wherein the two sides of the groundwater remediation device are a water collection and filtration unit (1) and an effluent sedimentation unit (3), and the middle of the water collection and filtration unit (1) and the effluent sedimentation unit (3) is a filler remediation unit (2); The contaminated groundwater remediation equipment is equipped with an online monitoring system (4) and a control system (5); in: The water collection and filtration unit (1) includes an inlet (11), a No. 1 baffle (12), a No. 2 baffle (13), an inlet filter screen (15), an automatic submersible pump (16), and a liquid level monitoring probe (18); The inlet (11) is located on the top of one side of the water collection and filtration unit (1). The #1 baffle (12) and the #2 baffle (13) are arranged parallel to each other and perpendicular to each other below the inlet (11). The height of the #1 baffle (12) is higher than that of the #2 baffle (13). The inlet filter screen (15) is located on the upper part of the #2 baffle (13). The inlet multi-parameter monitoring device probe (14) of the online monitoring system (4) is set at the same height as the liquid level monitoring probe (18); The liquid level monitoring probe (18) is connected to the control system (5) and the automatic submersible pump (16); The water collection and filtration unit (1) is provided with a filter media extraction hole (191) and an extraction pump (192) at the top; The effluent settling unit (3) includes a No. 3 baffle (31), a No. 4 baffle (32), an effluent filter screen (33), an online multi-parameter monitoring device probe (34), and an effluent outlet (35); The outlet (35) is located at the bottom of the outlet settling unit (3). The #3 baffle (31) and the #4 baffle (32) are arranged parallel to each other and perpendicular to each other above the outlet (35). The height of the #3 baffle (31) is higher than that of the #4 baffle (32). The outlet filter screen (33) is located on the upper part of the #4 baffle (32). The probe (34) of the online monitoring system (4) for online multi-parameter monitoring of effluent is set at the end of the effluent sedimentation unit (3) and located in the upper area of ​​the outlet (35). Its height is not higher than h / 2, where h is the height of the contaminated groundwater remediation equipment. The upper part of the effluent settling unit (3) is provided with a filter media extraction hole (361) and an extraction pump (362); The filler repair unit (2) includes an inlet pipe (17), a funnel-shaped regulating zone (21), a modular ground cage zone (22), and an outlet overflow zone (23); The inlet pipe (17) is connected to the packing repair unit (2). The outlet of the inlet pipe (17) is horizontally connected to the funnel-shaped adjustment area (21) and is flush with the side of the funnel-shaped adjustment area (21). The inlet of the inlet pipe (17) is connected to the outlet of the automatic submersible pump (16). The modular cage area (22) is a region formed by layering cages filled with active materials. The upper part of the funnel-shaped adjustment area (21) is connected to the lower part of the modular cage area (22). The overflow area (23) is located above the modular ground cage area (22) and is connected to the water outlet settling unit (3).

2. The groundwater remediation equipment according to claim 1, wherein, The height h1 of the 1# baffle (12) is set to h / 2 < h1 < 2h / 3, the height h2 of the 2# baffle (13) is set to h / 3 < h2 < 2h / 3, the height h3 of the 3# baffle (31) is set to h / 6 < h3 < h / 2, and the height h4 of the 4# baffle (32) is set to h / 2 < h4 < 2h / 3; where h is the height of the contaminated groundwater remediation equipment.

3. The groundwater remediation equipment according to claim 1, wherein, The heights at which the in - line multi - parameter monitoring equipment probe (14) and the liquid - level monitoring probe (18) of the contaminated groundwater remediation equipment are set are not less than h / 2, where h is the height of the contaminated groundwater remediation equipment.

4. The groundwater remediation equipment according to claim 1, wherein, The height of the out - line multi - parameter monitoring equipment probe (34) is not higher than h / 2, where h is the height of the contaminated groundwater remediation equipment.

5. The groundwater remediation equipment according to claim 1, wherein, The maximum distance at the bottom of the funnel of the funnel - type adjustment area (21) is set to h / 6 - h / 3 cm, and the area height of the modular cage area is set to h / 3 - 2h / 3 cm, where h is the height of the contaminated groundwater remediation equipment; the bottom perimeter of the modular cage area is designed with a detachable silica gel cushion, and the upper single - layer cage module of the modular cage area is wrapped with a square skeleton welded by stainless steel and a stainless steel mesh with 10 - 30 meshes. The height of the single - layer cage skeleton is set to 1 - 10 cm, and the number of small cages inside the single - layer cage skeleton is 20 - 100. The said out - flow overflow area is located above the modular cage area and is connected to the out - flow sedimentation unit.

6. A method for remediation using the contaminated groundwater remediation equipment described in claim 1: The contaminated groundwater enters the water - collecting and filtering unit of the remediation equipment through the water inlet in an up - flow water - inlet and overflow - type water - outlet manner. The baffle reduces the water flow impact force, causing the water to slowly flow through the inlet filter screen into the in - line monitoring probe and the automatic submersible pump. The control system records the multi - parameters of the inlet water and the liquid - level change. When the liquid - level float ball of the automatic submersible pump stabilizes at the set height, the submersible pump can be automatically started to achieve flow regulation; when the liquid - level float ball of the automatic submersible pump does not meet the set height, the submersible pump is automatically shut down. The water body in the water - collecting and filtering unit is pumped into the funnel - type adjustment pool in the packing remediation unit, and the water flow is adjusted to enter the modular cage area in an up - flow manner for treatment. The treated water enters the out - flow sedimentation unit through the out - flow overflow area. After being guided by the baffle, it undergoes natural sedimentation and is then on - line monitored by the out - line multi - parameter monitoring equipment probe. After the on - line monitoring system records the multi - parameters of the out - flow water, it is discharged from the remediation equipment.

7. The method according to claim 6, wherein, The filtered substances are extracted through the filter material extraction holes at the upper part of the water - collecting and filtering unit and the upper part of the out - flow sedimentation unit.

8. The method according to claim 6, wherein, The active materials filled in the modular cage area (22) are a combination of different active materials according to the requirements of groundwater pollutants and treatment processes.

9. The method according to claim 8, wherein, The active materials are a combination of persulfate and oxalic - acid - modified zero - valent iron.

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