Novel polluted soil underground water multi-term extraction system
By performing gas-liquid separation in the extraction well and using electrochemical method of nanoparticle electrolyte in the oxidation-reduction treatment unit to treat contaminated soil groundwater, the problems of low efficiency and high cost of pollutant treatment in traditional technology are solved, and high efficiency is achieved , environmentally friendly pollutant degradation effect.
Patent Information
- Application Number
- CN202420732573.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-10
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2034-04-10
AI Technical Summary
Traditional soil and groundwater restoration technologies have limitations in terms of treatment efficiency, cost and sustainability, especially liquid pollutant treatment technologies such as membrane method, biochemical method and physical chemical method have membrane blockage, high energy consumption, long start-up cycle, Problems such as high cost of chemical agents and difficulty in disposing of waste residues.
Using a new multi-item extraction system for groundwater in contaminated soil, the preliminary separation is performed by setting up a gas-liquid separator in the extraction well, and the electrochemical treatment is performed using nanoparticle electrolyte in the oxidation-reduction treatment unit, combining graphite electrodes and redox The agent layer reduces current intensity and energy consumption, improves processing efficiency and degradation effect.
It significantly improves pollutant treatment efficiency, reduces energy consumption and operating costs, reduces the pollution of the waste gas treatment system to the environment, extends the service life of electrode materials, reduces the generation of harmful by-products, and enhances the treatment of difficult-to-degrade pollutants ability.
Smart Images
Figure CN222132986U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of groundwater in-situ restoration, and in particular relates to a novel contaminated soil groundwater multi-element extraction system. Background Art
[0002] With the acceleration of industrialization and urbanization, groundwater pollution is becoming increasingly serious. Although traditional soil and groundwater remediation technologies such as physical, chemical and biological methods can alleviate the pollution problem to a certain extent, they still have certain limitations in terms of treatment efficiency, cost and sustainability. Multiphase extraction (MPE) technology is an environmentally friendly in-situ remediation technology that uses vacuum extraction of soil gas, groundwater and non-aqueous phase liquid (NAPL) in contaminated areas to the ground for gas-liquid phase separation and treatment to remove organic pollutants in soil and groundwater.
[0003] The treatment of pollutants in the liquid phase currently mainly adopts membrane method (reverse osmosis and ultrafiltration), biochemical method (activated sludge), physicochemical method, electrochemical method and other technologies, and the matching water treatment equipment is selected according to the corresponding emission standards. There are also certain defects in practical applications. For example, pollutants are easily accumulated on the surface of the membrane method, resulting in blockage of the membrane pores and reduced filtration efficiency. Reverse osmosis and ultrafiltration usually require high-voltage drive and high energy consumption; the biochemical method has a long startup and operation cycle, and the reaction rate of activated sludge is reduced in a low temperature environment, and it cannot treat high-concentration organic pollutants; the investment cost of chemical agents and equipment in the physicochemical method is high, and the dosage of agents and reaction conditions need to be precisely controlled. The waste residue generated also needs further treatment or disposal. Utility Model Content
[0004] The utility model aims to solve the above technical problems and provides a novel contaminated soil and groundwater multi-extraction system for treating pollutants through an electrochemical method.
[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0006] A novel multi-extraction system for contaminated soil and groundwater, comprising an extraction well, an extraction device, a spray device, an oil-water separator, and an oxidation-reduction treatment unit; the extraction device comprises a gas-liquid separator, a separation chamber for installing the gas-liquid separator is formed in the extraction well, the gas-liquid separator comprises a gas-liquid separator shell, a liquid phase extraction pipe, an extraction pump, and a gas phase overflow pipe, the lower end of the liquid phase extraction pipe is arranged at the bottom of the gas-liquid separator, the extraction pump is installed on the liquid phase extraction pipe, the lower end of the gas phase overflow pipe is communicated with the top of the gas-liquid separator shell, the gas phase overflow pipe is connected to the spray device, the liquid phase overflow pipe is connected to the oil-water separator, the water phase output end of the oil-water separator is connected to the oxidation-reduction treatment unit, and the oxidation-reduction treatment unit is connected to the spray device.
[0007] As a preferred technical solution, the oxidation-reduction treatment unit includes an oxidation-reduction treatment unit shell, a power control box, an ion exchange layer, a nanoparticle electrolyte, an anode plate, a cathode plate, and a redox agent layer. The ion exchange layer is arranged in the oxidation-reduction treatment unit shell and divides the oxidation-reduction treatment unit shell into two upper and lower cavities. The two cavities are filled with the nanoparticle electrolyte. The anode plate and the cathode plate are arranged at the upper and lower ends of the oxidation-reduction treatment unit shell. The power control box connects the anode plate and the cathode plate. The redox agent layer is arranged between the anode plate and the nanoparticle electrolyte and between the cathode plate and the nanoparticle electrolyte. Both cavities are provided with a water inlet and a water outlet at the front and rear ends of the cavities for water supply phase inflow and outflow, and the water inlets and outlets of the two cavities are in opposite directions.
[0008] As a preferred technical solution, the extraction well includes a well body and a well cover, the well cover is installed on the top of the extraction well, the well cover is connected to the upper end of the well body through a threaded pipe clamp, and the top end of the gas-liquid separator shell is connected to the well cover.
[0009] As a preferred technical solution, a polyvinyl chloride screen is provided at the bottom of the gas-liquid separator, and the lower end of the liquid phase extraction pipe is inserted into the polyvinyl chloride screen.
[0010] As a preferred technical solution, an inclined baffle is provided below the gas phase overflow pipe in the gas-liquid separator.
[0011] As a preferred technical solution, the gas-liquid separator further comprises a corrugated plate demister, the corrugated plate demister is arranged in the middle of the gas phase separator, and the corrugated plate demister fills the cross section of the gas phase separator.
[0012] As a preferred technical solution, the extraction device also includes an air compressor, an air pipe and a pneumatic valve. The air pipe is arranged on one side of the well body in the extraction well, the air compressor is connected to the air pipe, and the pneumatic valve is arranged on the air pipe.
[0013] As a preferred technical solution, the oxidation-reduction treatment unit shell is provided with a pressure relief pipe near the water outlet, and the pressure relief pipe is provided with a pressure relief valve.
[0014] After adopting the above technical solution, the utility model has the following advantages:
[0015] 1. The utility model discloses a novel contaminated soil and groundwater multi-extraction system, which performs gas-liquid separation by setting a separation chamber in the extraction well. The preliminary separation in the extraction well can reduce the burden of subsequent processing units, reduce external pipeline connections and possible leakage points, reduce environmental impact factors, and simplify the process of the entire extraction system.
[0016] 2. The utility model discloses a novel multi-extraction system for contaminated soil and groundwater, which treats pollutants by electrochemical method, and the electrolyte in the oxidation-reduction treatment unit contains nanoparticles. Nanoparticles have a large surface area and high activity, which can significantly increase the rate of electrochemical oxidation-reduction reactions, thereby improving treatment efficiency. At the same time, nanoparticles can enhance the treatment effect on difficult-to-degrade pollutants, such as certain persistent and difficult-to-degrade organic pollutants. Nanoparticles can improve the degradation effect of these pollutants by providing more reaction sites and accelerating the reaction rate. Nanoparticles usually have high activity and can reduce the generation of harmful by-products during the treatment process, thereby reducing the risk of secondary pollution.
[0017] 3. When treating certain pollutants, the electrochemical method may require a long time or use a higher current intensity to effectively decompose and remove them, which consumes a lot of energy. The utility model is a new type of contaminated soil and groundwater multi-extraction system, which reduces the current intensity required for electrochemical oxidation-reduction reactions by adding nanoparticles, thereby reducing energy consumption and operating costs.
[0018] 4. The electrode materials of the oxidation-reduction treatment unit in the electrochemical method may corrode or be worn out and need to be replaced regularly. In the utility model, a new type of contaminated soil groundwater multi-extraction system is provided, and the anode plate and the cathode plate are made of graphite material, which is relatively stable in the electrochemical process, not easy to be corroded, has a long service life, is low in cost, and does not produce harmful byproducts. The redox agent layer covering the surface of the anode plate and the cathode plate can also make up for the shortcoming of the small specific surface area of the graphite electrode.
[0019] 5. The utility model provides a new type of contaminated soil groundwater multiple extraction system. The water treated by the oxidation-reduction treatment unit is added with medicine and returned to the spraying device, which can reduce the operating cost of the exhaust gas treatment system, reduce the pollution caused by the exhaust gas treatment system to the environment, and achieve a more environmentally friendly treatment process.
[0020] 6. In the process of extraction to the gas-liquid separator by the traditional multiphase extraction (MPE) technology, pollutants may migrate in the form of gas or liquid, causing secondary environmental pollution. The utility model can prevent the migration of pollutants by setting a polyvinyl chloride screen at the bottom of the well body.
[0021] 7. Small mist droplets are easily drawn into the gas phase treatment device by the extraction pipe. The gas phase pollutant treatment equipment may not be able to adapt to the physical and chemical characteristics of the liquid phase pollutants, and cannot ensure the safety of operation and the treatment effect. The utility model prevents the droplets from being carried out by the air flow and entering the gas phase pollutant treatment equipment by setting an inclined baffle under the gas phase overflow pipe. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 It is a structural schematic diagram of a new type of contaminated soil groundwater multi-extraction system;
[0023] Figure 2 It is a schematic diagram of the structure of the extraction well and the extraction device;
[0024] Figure 3 Schematic diagram of the structure of the oxidation-reduction treatment unit. DETAILED DESCRIPTION
[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0026] like Figure 1-3 As shown, a new type of contaminated soil and groundwater multi-extraction system includes: an extraction well 1, an extraction device 2, a spray device 3, an oil-water separator 4, and an oxidation-reduction treatment unit 5.
[0027] The extraction well 1 includes a well body 101 and a well cover 102. The well cover 102 is installed at the top of the extraction well 1, and the well cover 102 is connected to the upper end of the well body 101 through a threaded pipe clamp 103. The well cover 102 and the well body 101 are both made of stainless steel to ensure sufficient structural strength, durability and corrosion resistance. The diameter of the well cover 102 is larger than the diameter of the well body 101, and an observation hole and a pipe drop hole are reserved.
[0028] The soil layer includes the vadose zone 6, the non-aqueous phase liquid 7 NAPL, and the contaminated groundwater layer 8 in sequence, and the extraction well depth needs to reach the contaminated groundwater layer 8. The gas, non-aqueous phase liquid 7, and contaminated groundwater in the vadose zone 6 invade the bottom of the well body 101 and flow upward.
[0029] The extraction device 2 includes a gas-liquid separator 21. A separation chamber for installing the gas-liquid separator 21 is formed in the well body 101. The gas-liquid separator 21 is a gravity gas-liquid separator, which is used to separate the gas phase and the liquid phase in the extraction well 1. The gas-liquid separator 21 includes a gas-liquid separator housing 211, a liquid phase extraction pipe 212, an extraction pump 213, and a gas phase overflow pipe 214.
[0030] The bottom of the gas-liquid separator 21 is connected to the separation chamber in the well body 101, and the gas, non-aqueous phase liquid and contaminated groundwater invading the bottom of the well body 101 enter the gas-liquid separator 21. The top of the gas-liquid separator housing 211 is connected to the well cover 102.
[0031] A polyvinyl chloride screen 215 is provided at the bottom of the gas-liquid separator 21. The lower end of the liquid phase extraction pipe 212 is inserted into the polyvinyl chloride screen 215, and the upper end of the liquid phase extraction pipe 212 extends out of the upper end of the gas-liquid separator housing 211. The extraction pump 213 is installed on the liquid phase extraction pipe 212 to extract the liquid phase at the bottom of the gas-liquid separator 221. A vacuum gauge 216 is installed on the portion of the liquid phase extraction pipe 212 extending out of the gas-liquid separator housing 211.
[0032] The gas phase overflow pipe 214 is installed on the manhole cover 102, and the lower end of the gas phase overflow pipe 214 is connected to the top of the gas-liquid separator housing 211. An inclined baffle 217 is provided below the gas phase overflow pipe 214 in the gas-liquid separator 21 to prevent liquid droplets from being carried out by the airflow.
[0033] The gas-liquid separator 21 further includes a corrugated plate demister 218, which is disposed in the middle of the gas phase separator 21 and fills the cross section of the gas phase separator 21. The liquid phase extraction pipe 212 passes through the middle of the corrugated plate demister 218.
[0034] The extraction device 2 further includes an air compressor 22, an air pipe 23 and a pneumatic valve 24. The air pipe 23 is arranged on one side of the well body 101 in the extraction well 1. The air compressor 22 is connected to the air pipe 23 to transport air to the bottom of the extraction well 1, so that the gas in the air zone 6, the non-aqueous phase liquid 7 and the contaminated groundwater invade the bottom of the well body 101 and return upward. The pneumatic valve 24 is arranged on the air pipe 23 to realize the opening and closing of the air pipe 23.
[0035] The gas phase overflow pipe 214 is connected to the spray device 3, and the spray device 3 is used to treat and discharge soluble pollutants in the gas phase. A valve for controlling the opening and closing of the gas phase overflow pipe 214 is provided on the gas phase overflow pipe 214.
[0036] The liquid phase overflow pipe 212 is connected to the oil-water separator 4, and the oil-water separator 4 is used to separate the liquid phase into non-aqueous phase liquid and aqueous phase liquid. The non-aqueous phase liquid NAPL is collected, and the aqueous phase liquid is input into the oxidation-reduction treatment unit 5. The oxidation-reduction treatment unit 5 is connected to the spray device 4, and the water treated by the oxidation-reduction treatment unit 5 is added with medicine and refluxed for the spray device 4, which can reduce the operating cost of the exhaust gas treatment system, reduce the pollution caused by the exhaust gas treatment system to the environment, and achieve a more environmentally friendly treatment process.
[0037] The oxidation-reduction treatment unit 5 is an electrochemical oxidation-reduction treatment unit, and includes: an oxidation-reduction treatment unit housing 51 , a power control box 52 , an ion exchange layer 53 , a nanoparticle electrolyte 54 , an anode plate 55 , a cathode plate 56 , and an oxidation-reduction agent layer 57 .
[0038] The ion exchange layer 53 is arranged in the oxidation-reduction treatment unit shell 51 and divides the oxidation-reduction treatment unit shell 51 into two upper and lower cavities. The two cavities are filled with the nanoparticle electrolyte 54. The anode plate 55 and the cathode plate 56 are arranged at the upper and lower ends of the oxidation-reduction treatment unit shell 51. The power control box 42 connects the anode plate 55 and the cathode plate 56 to supply power to the oxidation-reduction treatment unit 5. The redox agent layer 57 is arranged between the anode plate 55 and the nanoparticle electrolyte 54 and between the cathode plate 56 and the nanoparticle electrolyte 54. Both cavities are provided with a water inlet 58 and a water outlet 59 at the front and rear ends of the cavities for water phase inflow and outflow, and the water inlets 58 and the water outlets 59 of the two cavities are in opposite directions. The oxidation-reduction treatment unit shell 51 is provided with a pressure relief pipe 510 near the water outlet 59, and a pressure relief valve 511 is provided on the pressure relief pipe 510.
[0039] The anode plate 55 and the cathode plate 56 are evenly arranged with graphite electrode joints, and current is introduced through the power supply control box 52. By adjusting the current of the electrode system, the generation of oxidants and reductants is controlled. Redox reactions occur on the surface of the nanoparticles distributed in the electrolyte. Their high specific surface area and catalytic activity enhance the efficiency of the electrochemical process, catalyze the degradation of pollutants, and accelerate the degradation process of pollutants. Oxidants and reductants act on pollutants to convert them into harmless substances. The treated water is discharged after being tested to meet the standards, or reused in the spray device 3, and spray absorption liquid is prepared after adding drugs to treat gaseous pollutants.
[0040] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.
[0041] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.
Claims
1. A new type of contaminated soil and groundwater multi-extraction system, characterized in that: It includes an extraction well, an extraction device, a spray device, an oil-water separator, and an oxidation-reduction treatment unit; the extraction device includes a gas-liquid separator, a separation chamber for installing the gas-liquid separator is formed in the extraction well, the gas-liquid separator includes a gas-liquid separator shell, a liquid phase extraction pipe, an extraction pump, and a gas phase overflow pipe, the lower end of the liquid phase extraction pipe is arranged at the bottom of the gas-liquid separator, the extraction pump is installed on the liquid phase extraction pipe, the lower end of the gas phase overflow pipe is communicated with the top of the gas-liquid separator shell, the gas phase overflow pipe is connected to the spray device, the liquid phase overflow pipe is connected to the oil-water separator, the water phase output end of the oil-water separator is connected to the oxidation-reduction treatment unit, and the oxidation-reduction treatment unit is connected to the spray device.
2. A novel contaminated soil and groundwater multi-element extraction system according to claim 1, characterized in that: The oxidation-reduction treatment unit includes an oxidation-reduction treatment unit shell, a power control box, an ion exchange layer, a nanoparticle electrolyte, an anode plate, a cathode plate, and a redox agent layer. The ion exchange layer is arranged in the oxidation-reduction treatment unit shell and divides the oxidation-reduction treatment unit shell into two upper and lower cavities. The two cavities are filled with the nanoparticle electrolyte. The anode plate and the cathode plate are arranged at the upper and lower ends of the oxidation-reduction treatment unit shell. The power control box connects the anode plate and the cathode plate. The redox agent layer is arranged between the anode plate and the nanoparticle electrolyte and between the cathode plate and the nanoparticle electrolyte. Both cavities are provided with a water inlet and a water outlet at the front end and the rear end of the cavity for water supply phase to flow in and out, and the water inlet and the water outlet of the two cavities are in opposite directions.
3. A novel contaminated soil and groundwater multi-element extraction system according to claim 1, characterized in that: The extraction well comprises a well body and a well cover, wherein the well cover is installed at the top of the extraction well, the well cover is connected to the upper end of the well body through a threaded pipe clamp, and the top end of the gas-liquid separator shell is connected to the well cover.
4. A novel contaminated soil and groundwater multi-element extraction system according to claim 1, characterized in that: A polyvinyl chloride screen is provided at the bottom of the gas-liquid separator, and the lower end of the liquid phase extraction pipe is inserted into the polyvinyl chloride screen.
5. A novel contaminated soil and groundwater multi-element extraction system according to claim 1, characterized in that: An inclined baffle is provided below the gas phase overflow pipe in the gas-liquid separator.
6. A novel contaminated soil and groundwater multi-element extraction system according to claim 1, characterized in that: The gas-liquid separator further comprises a corrugated plate demister, which is arranged in the middle of the gas-liquid separator and fills the cross section of the gas-liquid separator.
7. A novel contaminated soil and groundwater multi-element extraction system according to claim 3, characterized in that: The extraction device also includes an air compressor, an air pipe and a pneumatic valve. The air pipe is arranged on one side of the well body in the extraction well, the air compressor is connected to the air pipe, and the pneumatic valve is arranged on the air pipe.
8. A novel contaminated soil and groundwater multi-element extraction system according to claim 2, characterized in that: The oxidation-reduction treatment unit shell is provided with a pressure relief pipe near the water outlet, and the pressure relief pipe is provided with a pressure relief valve.