Environment restoration type electric reinforced permeable reactive barrier equipment

Abstract

The invention provides environment restoration type electric reinforced permeable reactive barrier equipment which comprises a permeable reactive barrier, an anode well and a cathode well, the anode well and the cathode well are arranged on the two sides of the permeable reactive barrier respectively, an anode control box is installed on the top of the anode well, a cathode control box is installed on the top of the cathode well, and the anode control box is connected with the cathode control box. A high-precision adjustable direct-current stabilized power supply is arranged at the top of the permeable reactive barrier, and the anode control box and the cathode control box are both connected with the high-precision adjustable direct-current stabilized power supply; the permeable reactive barrier comprises a soil chamber, two PRB chambers and two electrode chambers, and electrode plates are mounted in the electrode chambers through electrode clamps; the advantages of the two technologies are combined, pollutants can be pushed to the PRB through electromigration and electroosmosis of electrokinetic remediation, the removal efficiency of the pollutants is improved, the pollutants can be further treated through the physical, chemical or biological action process of the PRB, and therefore the better remediation effect is achieved.

Description

Technical Field

[0001] The invention relates to environmental restoration type electrically enhanced permeable reaction wall equipment, belonging to the technical field of groundwater restoration. Background Art

[0002] Both electroremediation technology and PRB technology are emerging in-situ remediation technologies for soil and groundwater. Electroremediation technology can effectively remove heavy metals such as chromium, cadmium, and lead, as well as organic matter such as phenol and chlorinated hydrocarbons from the soil by applying DC voltage on both sides of the contaminated soil. PRB technology mainly uses the precipitation, adsorption, oxidation-reduction and biodegradation reactions produced when pollutants pass through the filling active reaction materials to remove pollutants. It is frequently used in the remediation of groundwater pollution projects. In practical applications, electroremediation and PRB technologies still have some limitations. When electroremediation technology is used to repair contaminated soil, the treatment effect is greatly affected by solubility, and the removal effect is not good for pollutants with poor solubility and weak desorption ability and non-polar organic matter. The interaction between the filling materials and pollutants in PRB and the method of removing pollutants by inorganic mineral precipitation can easily lead to PRB blockage, limiting the application of PRB technology in soil remediation.

[0003] The reducing matrix filled in PRB is mostly Fe0, and its particle size has reached the nanometer level. The cost of nanometer Fe0 is relatively high, and a large amount of it needs to be used in actual projects, which will cause the cost of soil remediation to be relatively high. In addition, the technical parameters of the electric remediation enhanced permeable reaction wall equipment used in the remediation of contaminated sites have not been optimized, resulting in low pollutant removal performance and economic practicality.

[0004] In order to solve the above technical problems, an environmental restoration type electric enhanced permeable reaction wall equipment is proposed. Summary of the invention

[0005] In view of this, the present invention provides an environmental restoration type electrically enhanced permeable reaction wall equipment to solve or alleviate the technical problems existing in the prior art and at least provide a beneficial option.

[0006] The technical solution of the present invention is implemented as follows: an environmental restoration type electric enhanced permeable reaction wall equipment comprises a permeable reaction wall, an anode well and a cathode well, wherein the anode well and the cathode well are respectively arranged on both sides of the permeable reaction wall, an anode control box is installed on the top of the anode well, and a cathode control box is installed on the top of the cathode well, a high-precision adjustable DC voltage-stabilized power supply is arranged on the top of the permeable reaction wall, the anode control box and the cathode control box are both connected to the high-precision adjustable DC voltage-stabilized power supply, electrodes are installed inside the anode well and the cathode well, and a circulation pump is arranged on the top of the anode well and the cathode well, and the two circulation pumps are respectively connected to the anode well and the cathode well, and one end of the circulation pump is connected to an electrolyte container;

[0007] The permeable reaction wall comprises a soil chamber, two PRB chambers and two electrode chambers, wherein electrode sheets are installed in the electrode chambers through electrode clamps, and the circulation pump is communicated with the electrode chambers.

[0008] Further preferably, the two PRB chambers close to the anode are filled with zero-valent iron, sulfided zero-valent iron and a micron-sized zero-valent iron composite material modified by sulfided synergistic activated carbon.

[0009] Further preferably, the electrode chamber is powered by an independent power supply so that the current intensity of the electrode chamber is adjustable.

[0010] Further preferably, the soil chamber is vertically divided into different parts from left to right to detect the removal of various soil heavy metals.

[0011] The method for optimizing parameters of environmental restoration type electrically enhanced permeable reactive wall equipment comprises the following steps:

[0012] S1. Collect samples from contaminated sites;

[0013] S2. Chemical analysis;

[0014] S3, monitoring the operation of the reactor;

[0015] S4. Investigate the design and operating parameters of the PRB reactor.

[0016] Further preferably, in S2, the concentration change of heavy metals is determined by chemical analysis.

[0017] Further preferably, in S3, the operating conditions of the reactor are monitored including parameters such as temperature and pH value.

[0018] Further preferably, in said S4, the design and operating parameters of the PRB reactor are examined, including the material selection of the reactor wall, flow control, and maintenance of reaction conditions (such as temperature, pH, etc.) to ensure the long-term stability of the technology.

[0019] The embodiment of the present invention has the following advantages due to the adoption of the above technical solution:

[0020] 1. The present invention combines the advantages of two technologies. It can not only use the electromigration and electroosmosis of electroremediation to push pollutants to PRB to improve the removal efficiency of pollutants, but also use the physical, chemical or biological action process of PRB to further treat pollutants, thereby achieving better remediation effect;

[0021] Second, the present invention selects zero-valent iron and its modified materials, sulfided zero-valent iron, and sulfided activated carbon-modified zero-valent iron as filling materials, which can enhance the removal effect of specific pollutants and effectively degrade and remove heavy metals and organic pollutants such as Cr(VI) and trichloroethylene in groundwater;

[0022] 3. The present invention adjusts the current intensity, electrode arrangement, etc. according to the actual parameters of the contaminated site to achieve optimized parameter operation, improve pollutant removal efficiency, and reduce remediation costs, providing an effective solution for soil and groundwater remediation.

[0023] The above summary is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present invention will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 This is a structural diagram of the electrokinetic enhanced permeable reactive wall equipment of the present invention;

[0026] Figure 2 This is a connection structure diagram of the high-precision adjustable DC regulated power supply in the present invention;

[0027] Figure 3 It is a structural diagram of the anode well, the permeable reaction wall and the cathode well in the present invention;

[0028] Figure 4 It is a cross-sectional structural diagram of the anode well, the permeable reaction wall and the cathode well in the present invention;

[0029] Figure 5 It is a structural diagram of the permeable reaction wall in the present invention;

[0030] Figure 6 This is a flow chart of the method for optimizing parameters of the electrically enhanced permeable reaction wall equipment in the present invention.

[0031] Figure numerals: 11, permeable reaction wall; 12, anode well; 13, cathode well; 14, anode control box; 15, cathode control box; 16, high-precision adjustable DC regulated power supply; 17, circulation pump; 18, electrolyte container; 19, electrode; 21, soil chamber; 22, PRB chamber; 23, electrode chamber; 24, electrode sheet. DETAILED DESCRIPTION

[0032] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0033] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0034] like Figure 1-5 As shown, an embodiment of the present invention provides an environmental restoration type electrically enhanced permeable reaction wall equipment, which is composed of a permeable reaction wall 11, an anode well 12 and a cathode well 13.

[0035] The anode well 12 and the cathode well 13 are respectively arranged on both sides of the permeable reaction wall 11. An anode control box 14 is installed on the top of the anode well 12, and a cathode control box 15 is installed on the top of the cathode well 13. A high-precision adjustable DC voltage-regulated power supply 16 is provided on the top of the permeable reaction wall 11. The anode control box 14 and the cathode control box 15 are both connected to the high-precision adjustable DC voltage-regulated power supply 16. Electrodes 19 are installed inside the anode well 12 and the cathode well 13. Circulation pumps 17 are provided on the top of the anode well 12 and the cathode well 13. The two circulation pumps 17 are respectively connected to the anode well 12 and the cathode well 13, and one end of the circulation pump 17 is connected to an electrolyte container 18.

[0036] The permeable reaction wall 11 includes a soil chamber 21, two PRB chambers 22 and two electrode chambers 23. The soil chamber 21 is vertically divided into different parts from left to right to detect the removal of various soil heavy metals. An electrode sheet 24 is installed in the electrode chamber 23 through an electrode clamp. The electrode chamber 23 is powered by an independent power supply so that the current intensity of the electrode chamber 23 is adjustable. The circulation pump 17 is connected to the electrode chamber 23. The two PRB chambers 22 close to the anode are filled with zero-valent iron, sulfide zero-valent iron and sulfide synergistic activated carbon modified micron-scale zero-valent iron composite materials.

[0037] In one embodiment, cheap, readily available, and highly reducing zero-valent iron is used as a filling material for EK-PRB to study its decontamination performance. In view of the defects such as the easy formation of passivation film on the surface of ZVI, a high-performance zero-valent iron sulfide is prepared by a liquid phase precipitation method, and the effects of the dosage of the zero-valent iron sulfide material and its passivation and corrosion behaviors on the pollution control performance and service life of the EK-PRB are studied. In view of the poor dispersibility of the zero-valent iron sulfide, PAC is introduced into the ZVI sulfurization process to prepare a micron-sized zero-valent iron composite material modified by sulfurization and activated carbon, and the effects of the material dosage, the passivation and corrosion behaviors of the iron powder, and the rapid saturation of activated carbon on the pollution control performance and service life of the EK-PRB are studied.

[0038] In one embodiment, a fixed amount of electrolyte is added to the two electrode chambers 23 of the anode and cathode respectively, and the electrolyte of the cathode and cathode is circulated and transported by the circulation pump 17 to maintain the same liquid level of the cathode and cathode.

[0039] like Figure 6 As shown, the embodiment of the present invention also provides a method for optimizing parameters of an environmental restoration type electrically enhanced permeable reaction wall equipment, comprising the following steps:

[0040] S1. Collect samples from contaminated sites;

[0041] S2. Chemical analysis: determine the concentration changes of heavy metals through chemical analysis;

[0042] S3, monitoring the operation of the reactor, including parameters such as temperature and pH value;

[0043] S4. Examine the design and operating parameters of the PRB reactor, including material selection for the reactor wall, flow control, and maintenance of reaction conditions (such as temperature, pH, etc.) to ensure the long-term stability of the technology.

[0044] When the present invention is working: by controlling variables to optimize the factors such as voltage gradient, soil moisture content and repair time in the process of EK-PRB repairing heavy metal contaminated soil, zero-valent iron, sulfide zero-valent iron and sulfide synergistic activated carbon modified micron-sized zero-valent iron composite materials are filled into the PRB chamber 22 of the electrically enhanced permeable reaction wall equipment filled with soil containing heavy metals, which is close to the anode of the electrode chamber 23, and a certain amount of electrolyte is added to the two electrode chambers 23 respectively. The electrolyte of the cathode and anode is circulated and transported by the circulation pump 17 and the liquid levels of the cathode and anode are maintained consistent. The heavy metal contaminated soil is repaired by powering on at a constant voltage, and the soil chamber 21 is vertically divided into different parts from left to right, and the removal of heavy metals in each part of the soil is detected. It is intended to illustrate its application effect through on-site small-scale tests and typical demonstrations, and preliminarily evaluate its rapidity, high efficiency and economic practicability.

[0045] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of various changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An environmental restoration type electrically enhanced permeable reaction wall equipment, comprising a permeable reaction wall (11), an anode well (12) and a cathode well (13), characterized in that: The anode well (12) and the cathode well (13) are respectively provided with two sides of the permeable reaction wall (11); an anode control box (14) is installed on the top of the anode well (12); a cathode control box (15) is installed on the top of the cathode well (13); a high-precision adjustable DC voltage-stabilized power supply (16) is provided on the top of the permeable reaction wall (11); the anode control box (14) and the cathode control box (15) are both connected to the high-precision adjustable DC voltage-stabilized power supply (16); electrodes (19) are installed inside the anode well (12) and the cathode well (13); a circulation pump (17) is provided on the top of the anode well (12) and the cathode well (13); the two circulation pumps (17) are respectively connected to the anode well (12) and the cathode well (13); one end of the circulation pump (17) is connected to an electrolyte container (18); The permeable reaction wall (11) comprises a soil chamber (21), two PRB chambers (22) and two electrode chambers (23), wherein an electrode sheet (24) is installed in the electrode chamber (23) via an electrode clamp, and the circulation pump (17) is connected to the electrode chamber (23).

2. The environmental restoration type electrically enhanced permeable reactive wall equipment according to claim 1, characterized in that: The two PRB chambers (22) close to the anode are filled with zero-valent iron, sulfided zero-valent iron and a micron-sized zero-valent iron composite material modified by sulfided synergistic activated carbon.

3. The environmental restoration type electrically enhanced permeable reactive wall equipment according to claim 1, characterized in that: The electrode chamber (23) is powered by an independent power source, so that the current intensity of the electrode chamber (23) is adjustable.

4. The environmental restoration type electrically enhanced permeable reactive wall equipment according to claim 1, characterized in that: The soil chamber (21) is vertically divided into different parts from left to right to detect the removal of various soil heavy metals.

5. A method for optimizing parameters of an environmental restoration type electrically enhanced permeable reactive wall equipment according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1. Collect samples from contaminated sites; S2. Chemical analysis; S3, monitoring the operation of the reactor; S4. Investigate the design and operating parameters of the PRB reactor.

6. The method for optimizing parameters of environmental restoration type electrically enhanced permeable reactive wall equipment according to claim 5, characterized in that: In S2, the concentration change of heavy metals is determined by chemical analysis.

7. The method for optimizing parameters of environmental restoration type electrically enhanced permeable reactive wall equipment according to claim 5, characterized in that: In S3, the operation status of the reactor is monitored, including parameters such as temperature and pH value.

8. The method for optimizing parameters of environmental restoration type electrically enhanced permeable reactive wall equipment according to claim 5, characterized in that: In said S4, the design and operation parameters of the PRB reactor are examined, including the material selection of the reactor wall, flow control, and maintenance of reaction conditions (such as temperature, pH, etc.) to ensure the long-term stability of the technology.

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