CN110947752A - In-situ chemical oxidation remediation device for simulating polluted underground water and using method - Google Patents
In-situ chemical oxidation remediation device for simulating polluted underground water and using method Download PDFInfo
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- CN110947752A CN110947752A CN201911358374.XA CN201911358374A CN110947752A CN 110947752 A CN110947752 A CN 110947752A CN 201911358374 A CN201911358374 A CN 201911358374A CN 110947752 A CN110947752 A CN 110947752A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/002—Reclamation of contaminated soil involving in-situ ground water treatment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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Abstract
The invention discloses a simulated polluted groundwater in-situ chemical oxidation remediation device which comprises a water inlet device, a sand box, a remediation unit, a simulated aquifer, a pollution source leakage groove, a monitoring well, an online detection device and a water outlet device, wherein the remediation unit comprises a plurality of permeable reactive grid injection wells and a first injection well which are vertically arranged, each permeable reactive grid injection well comprises a second injection well and a permeable reactive grid, each permeable reactive grid is installed in the second injection well, the simulated aquifer is horizontally paved in the sand box, the monitoring well is arranged in the sand box and is positioned at the side close to the water outlet device, and the online detection device is installed in the monitoring well. The invention is suitable for organic polluted underground water with different properties and different concentrations, combines the controlled slow release technology and the in-situ permeable reactive barrier technology, and solves the problem of remediation of the underground water polluted by low-concentration organic matters.
Description
Technical Field
The invention discloses a simulated polluted groundwater remediation device and a using method thereof, and particularly relates to the field of wastewater or sewage treatment.
Background
With the rapid development of the petroleum industry, in places such as petrochemical production areas, gas stations and the like, a large amount of petroleum pollutants enter soil layers due to the leakage of oil falling to the ground, oil pipelines, the discharge of oily production sewage and the like, and soil and underground water are polluted. The pollution of petroleum and byproducts to the environment is more and more serious, and the survival and health of human beings, animals and plants are endangered. Because the main pollution components of petroleum and its byproducts to the environment include volatile organic compounds such as benzene, the organic hydrocarbons in petroleum exist in liquid state, are difficult to dissolve in water and have lower density than water, and are called light non-aqueous phase fluid. After leaking from a point source, the light non-aqueous phase fluid vertically migrates to an upper interface of a capillary saturation area in an air-entrained soil zone under the action of gravity and then transversely spreads until reaching the underground water surface, and finally floats on the underground water surface to form a lens body of the light non-aqueous phase fluid.
Currently, typical common soil and groundwater remediation technologies mainly include an ex-situ remediation technology and an in-situ remediation technology. Ectopic remediation is mainly based on a P & T (Pump and treat) technology, which is the earliest technology for remediating soil groundwater, namely, pumping groundwater from the original position, and recharging the groundwater to the position where the groundwater is located after the groundwater is remediated in different places. However, the non-aqueous solution retained in the aqueous layer is hardly pumped out of the pump due to capillary tension, and thus is not suitable for the remediation of petroleum and its by-products. The in-situ remediation technology is mainly carried out in soil and underground water, has low remediation cost, good effect, various remediation methods, low disturbance on a remediation area and wide application range, so that the in-situ remediation technology is increasingly applied to actual remediation processes, particularly fields polluted by petroleum and byproducts thereof, in the future remediation process of soil and underground water pollution.
The in-situ remediation technology is mainly an in-situ chemical oxidation technology, and the in-situ chemical oxidation technology effectively destroys pollutants by utilizing the oxidation reaction of the oxidant and the pollutants through delivering a chemical oxidant to polluted underground water, so that the harm of the pollutants to the environment is reduced. The in-situ chemical oxidation technology is suitable for various pollutants including chlorohydrocarbon solvents, petroleum hydrocarbons, polycyclic aromatic hydrocarbons and the like, has the advantages of short repair period, moderate cost, capability of treating various pollutants simultaneously, high treatment efficiency, thorough treatment effect and the like, meets the requirement of fast repair of polluted sites in China, and has wide application prospect in repairing polluted underground water.
In the groundwater pollution remediation process, when chemical oxidation remediation is carried out by using an in-situ injection mode, due to the problems of limited injection well quantity and hydraulic conductivity distribution, the control of the using amount of the oxidant by a water phase injection system is very difficult.
The low permeability clay layer acts as a water barrier to prevent vertical migration of groundwater contaminants. However, organic contaminants may also slowly enter these formations by diffusion and adsorb onto the fine materials. These formations may then be stored as long-term contaminants, releasing the adsorbed contaminants through a back-diffusion process. Furthermore, in high permeability aquifers, low permeability substances (such as clay lenticles) tend to present a media heterogeneity that can adsorb organic contaminants and then release them by back diffusion. Concentration tailing phenomena are caused by subsurface inhomogeneities, rate-limiting desorption and rate-limiting dissolution of immiscible liquids. Due to the reasons and the capillary action of a pore cavity, an 'advantageous channel' and a water level amplitude-variable zone of the groundwater aquifer, the phenomena of 'rebound', 'back diffusion' and 'tailing' of the repairing effect commonly exist in the groundwater in-situ repairing.
Whether a permeable grid or water phase injection is adopted, the properties of the aquifer, the reversibility of geochemical changes (such as dissolution, desorption and pH value change), the distribution and flux of pollutants and the like are evaluated in detail so as to design an effective in-situ treatment system.
In the simulation experiment of in-situ pollution remediation of the groundwater at the present stage, a column experiment and a tank experiment are mostly adopted to simulate the movement of the polluted groundwater in a water-bearing stratum, and the removal effect of pollutants is evaluated. The column experiment simulates the one-dimensional distribution condition of pollutants, and the three-dimensional distribution characteristic of the pollutants cannot be simulated, so that the groundwater remediation environment simulated by the column experiment is different from the actual environment, and the pollutant remediation effect is difficult to deeply evaluate. Compared with a column experiment, the groove experiment is used as an important laboratory simulation device of the groundwater pollution remediation technology, can well simulate three-dimensional characteristics of groundwater, and analyzes three-dimensional change trend of pollutant degradation in the remediation process.
The existing underground water in-situ pollution remediation tank experiment cannot be suitable for organic polluted underground water with different properties and different concentrations, cannot be used for remedying low-concentration organic polluted underground water, and cannot solve the problems of back diffusion, tailing, rebound and the like caused by the non-uniformity of a low-permeability medium.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the problems in the prior art, the in-situ chemical oxidation repair device and method for simulating the polluted underground water are provided, the low-concentration organic matter polluted underground water is repaired, and the problems of non-uniform back diffusion, tailing, rebounding and the like of a low-permeability medium are solved.
The invention relates to an in-situ chemical oxidation repair device for simulated polluted groundwater, which comprises a water inlet device, a sand box, a repair unit, a simulated aquifer, a pollution source leakage groove, a monitoring well, an online detection device and a water outlet device, wherein the water inlet device and the water outlet device are respectively arranged on two sides of the sand box, the water inlet device and the water outlet device are respectively communicated with two sides of the sand box, the repair unit is arranged in the middle of the sand box, the repair unit comprises a plurality of permeable reaction grid injection wells and a first injection well which are vertically arranged, the permeable reaction grid injection wells comprise a second injection well and a permeable reaction grid, the permeable reaction grid is arranged in the second injection well, the simulated aquifer is horizontally paved in the sand box, the pollution source leakage groove is arranged on the upper part of the sand box and is close to the side of the water inlet device, the water outlet end of the pollution source leakage groove is located below the upper surface of the simulated aquifer, the monitoring well is arranged in the sand box and located close to the side of the water outlet device, and the online detection equipment is installed in the monitoring well.
Preferably, in order to prevent clay and coarse sand from entering the first injection well, the second injection well and the monitoring well, a carrier medium of the solid remediation agent in the second injection well is prevented from entering the remediation unit, a plurality of holes are opened on the well walls of the first injection well, the second injection well and the monitoring well, and gauze is further arranged outside the first injection well, the second injection well and the monitoring well.
Preferably, the water inlet device includes water inlet tank, water inlet tank overflow plate, water distribution district, water distribution board, water inlet tank overflow plate set up in inside the water inlet tank, will the water inlet tank separates for two parts, the water inlet tank bottom is connected with inlet tube and water inlet communicating pipe respectively, the other end of water inlet communicating pipe with water distribution district bottom intercommunication, one side in water distribution district is the water distribution board, the water inlet tank can set up with adjusting from top to bottom in water distribution district one side, the water distribution board intercommunication the water distribution district reaches the sand box.
Preferably, the water outlet device comprises a water outlet plate, a water outlet area, a water outlet tank overflow plate and a water outlet tank, the water outlet tank overflow plate is arranged in the water outlet tank and divides the water outlet tank into two parts, the bottom of the water outlet tank is respectively connected with a water outlet pipe and a water outlet communicating pipe, the other end of the water outlet communicating pipe is communicated with the bottom of the water outlet area, the water outlet tank overflow plate is arranged on one side of the water outlet area, the water outlet tank is arranged on one side of the water outlet area in an up-down adjustable manner, and the water outlet plate is communicated with the water outlet area and the sand box.
Preferably, the simulated aquifer sequentially comprises a first clay layer, a coarse sand layer and a second clay layer from bottom to top, the clay particle size of the first clay layer and the clay particle size of the second clay layer are smaller than 0.25mm, and the particle size of the coarse sand layer is 0.5-2.0 mm.
Preferably, in order to simulate the natural infiltration process of the pollution source, the pollution source leakage groove is trapezoidal, and a plurality of water outlet holes are formed in the bottom surface and the trapezoidal surface of the pollution source leakage groove.
Preferably, the device for simulating in-situ chemical oxidation remediation of polluted groundwater further comprises a sealing cover, and the sealing cover is connected with the upper surface of the sand box in a sealing manner.
Specifically, a plurality of sampling openings are uniformly formed in the front side of the sand box.
The invention also relates to a use method of the in-situ chemical oxidation repair device for simulating the polluted underground water, which comprises the following steps:
injecting underground water into a water inlet device, and controlling the height of the water inlet level to simulate confined water or a diving aquifer;
injecting organic polluted underground water into a pollution source leakage groove, and allowing organic matters to leak into the simulated aquifer;
injecting a liquid remediation agent into the first injection well;
the groundwater enters the simulated aquifer from the water inlet tank and is mixed with the organic polluted groundwater to form polluted feather, the liquid remediation agent and the permeable reactive barrier are used for remedying the polluted feather, and the remediated groundwater flows out of the water outlet device.
Preferably, the groundwater enters the simulated aquifer from the water intake means in a percolation manner.
The invention has the following advantages:
(1) the device can flexibly adjust the number of the permeable reactive grid injection wells and the first injection well and the dosage of the liquid remediation agent, is suitable for underground water polluted by organic matters with different properties and different concentrations, combines a controlled slow release technology with an in-situ permeable reactive grid technology, solves the remediation of the underground water polluted by low-concentration organic matters, and has lower operation and maintenance cost compared with the traditional in-situ chemical oxidation remediation technology.
(2) The permeable reactive barrier injection well in the device is filled with a solid repairing medicament, the first injection well is used for adding a liquid repairing medicament, the solid repairing medicament and the liquid repairing medicament are combined, the sustainable in-situ repair of stubborn organic pollutants in underground water is realized, the rapid treatment can be realized, the release period of reactants can be prolonged, namely the low peak release rate is realized, the permeable reactive barrier injection well has the characteristic of sustained release, the permeable reactive barrier injection well has the potential of cleaning any pollutants slowly diffused backwards into the underground water, and the problems of back diffusion, tailing, rebound and the like caused by the non-uniformity of a low-permeability medium can be solved.
(3) The device simulates the in-situ remediation environment of the polluted groundwater, the first clay layer and the second clay layer respectively simulate the aquifer of the aeration zone, and simulate the hydrogeological characteristics of the aquifer of the aeration zone, the seepage condition of the groundwater, the pollutant pollution process and the remediation process, so that theoretical reference can be provided for the engineering application of the in-situ chemical oxidation remediation technology of the polluted groundwater.
(4) The device of the invention can be used for simulating the pollution process of underground water, the remediation process of underground water and the remediation process while polluting.
(5) The device has the advantages of simple and ingenious structure, simple manufacture, convenient operation and low cost.
Drawings
FIG. 1 is a schematic diagram of the apparatus of the present invention;
FIG. 2 is a cross-sectional view of the apparatus of the present invention;
FIG. 3 is a top view of the sand box of FIG. 1;
FIG. 4 is a front view of the sand box of FIG. 1.
Detailed description of the preferred embodiments
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
Examples
As shown in fig. 1-3, the in-situ chemical oxidation remediation device for simulated polluted groundwater comprises a water inlet device 1, a sand box 2, a remediation unit 3, a simulated aquifer 4, a pollution source leakage tank 5, a monitoring well 6, an online detection device and a water outlet device 7.
The water inlet device 1 is arranged on one side of the sand box 2, the water inlet device 1 comprises a water inlet tank 11, a water inlet tank overflow plate 12, a water distribution area 13 and a water distribution plate 14, the water inlet tank overflow plate 12 is arranged inside the water inlet tank 11, the water inlet tank 11 is divided into two parts by the water inlet tank overflow plate 12, the bottom of the water inlet tank 11 is respectively connected with a water inlet pipe 15 and a water inlet communicating pipe 16, and the other end of the water inlet communicating pipe 16 is communicated with the bottom of the water distribution area 13. Water enters the water inlet tank 11 from the water inlet pipe 15, and when the water level rises, enters the other part of the water inlet tank 11 through the water inlet tank overflow plate 12 and enters the water distribution area 13 through the water inlet communicating pipe 16. One side of the water distribution area 13 is provided with a first clamping groove 17, the lower part of the water inlet tank 11 is provided with a first adjusting rod 18, the water inlet tank 11 is clamped on one side of the water distribution area 13 through the first clamping groove 17, and the water inlet tank is adjusted up and down through the first adjusting rod 18.
The other side of the water distribution area 13 is provided with a water distribution plate 14, and the water distribution plate 14 is communicated with the water distribution area 13 and the sand box 2. When the water level of the inlet water tank 11 is lower than the upper surface of the simulated aquifer 4, simulating the diving water level; when the water level of the inlet water tank 11 is higher than the upper surface of the simulated aquifer 4, the confined water level is simulated. The water distribution plate 14 includes sieve and screen cloth, is equipped with a plurality of apertures on the sieve, and the screen cloth glues on the sieve, and the screen cloth adopts high density nylon screen cloth, and the mesh of high density nylon screen cloth is between 100 supplyes 400 meshes for the water evenly distributed, 14 intercommunication water distribution districts 13 and sand box 2 of water distribution plate, and water distribution district 13 also communicates through water distribution plate 14 with pollution source seepage 5.
The repair unit 3 is disposed in the middle of the sand box 2, and the repair unit 3 includes a plurality of permeable reactive barrier injection wells 31 and a first injection well 32 which are vertically disposed. The permeable reactive barrier injection well 31 and the first injection well 32 are arranged in four rows and staggered with each other in the water flow direction. The number of permeable reactive barrier injection wells 31 is determined by the physicochemical characteristics of the organic contaminants and the remediation objectives. Permeable reactive barrier injection well 31 includes a second injection well 311 and a permeable reactive barrier 312. The method of preparing the permeable reactive barrier 312 includes the steps of: the solid repairing medicament adopts an oxidant sustained and controlled release material, the adhesive adopts one or more of paraffin, polymer resin, alginate and silicon dioxide, and the oxidant adopts one or more of sodium percarbonate, sodium persulfate and peroxide; the solid remediation agent, binder, oxidizer are heated, mixed and molded to form a cylindrical permeable reactive barrier 312. Permeable reactive barrier 312 is placed in second injection well 311 and remediation of organically contaminated groundwater is carried out using the active oxidant therein. The first injection well 32 is used to inject a fluid remediation agent selected from the group consisting of oxidizing agents such as fenton's reagent, fenton-like reagent, sodium percarbonate, sodium persulfate, and peroxides.
The monitoring well 6 is vertically arranged in the sand box 2 and is positioned at one side close to the water outlet device 7, the online detection equipment adopts a portable multi-parameter water quality analyzer of the American HACH SL1000 and is arranged in the monitoring well 6, sampling tubes are arranged at different depths of the monitoring well 6, and the online detection equipment dynamically monitors pH, conductivity, dissolved oxygen and temperature. The diameters of the first injection well 32, the second injection well 311 and the monitoring well 6 are 20-40mm, a plurality of holes are formed in the well walls of the first injection well 32, the second injection well 311 and the monitoring well 6, the hole diameter is 3-5mm, the hole spacing is 4-6mm, and gauze is further arranged on the outer sides of the first injection well 32, the second injection well 311 and the monitoring well 6.
The simulated aquifer 4 is horizontally paved in the sand box 2, and the simulated aquifer 4 sequentially comprises a first clay layer 41, a coarse sand layer 42 and a second clay layer 43 from bottom to top. The clay particle size of the first clay layer 41 and the second clay layer 43 is less than 0.25mm, and the weak permeable layer with smaller simulated permeability coefficient, namely the air-entrained zone aquifer is obtained. The grain diameter of the coarse sand layer 42 is 0.5-2.0 mm, and the simulation osmotic coefficient is larger. The first clay layer 41, the coarse sand layer 42 and the second clay layer 43 are arranged unevenly along the gradient, so that the characteristics of the actual site aquifer are more similar. The sealing cover 21 seals the upper surface of the flask 2. As shown in fig. 4, the front wall of the sand box 2 is provided with equally spaced sampling ports 22, which is convenient for sampling in the simulation experiment process and timely detecting the content of organic substances, volatile substances and the like. The sampling ports 22 are uniformly arranged in a plurality of rows, the row spacing b between each row is 100mm, a plurality of sampling ports 22 are uniformly arranged in each row, and the spacing a between each sampling port 22 is 150 mm.
The pollution source leakage groove 5 is arranged at the upper part of the sand box 2 and close to the side of the water inlet device 1, and the water outlet end of the pollution source leakage groove 5 is positioned below the upper surface of the simulated aquifer 4. The pollution source leakage groove 5 is trapezoidal, and a plurality of water outlet holes are formed in the bottom surface and the trapezoidal surface of the pollution source leakage groove 5 and used for injecting petroleum organic polluted underground water from a site or organic polluted underground water artificially prepared according to petroleum hydrocarbon components for naturally infiltrating the polluted underground water. The polluted underground water is permeated from top to bottom, the inlet water is permeated from the side surface, and the pollution permeation process in the natural environment is simulated.
The water outlet device 7 comprises a water outlet plate 71, a water outlet area 72, a water outlet tank overflow plate 73 and a water outlet tank 74. The outlet tank overflow plate 73 is arranged inside the outlet tank 74 to divide the outlet tank 74 into two parts, the bottom of the outlet tank 74 is respectively connected with the outlet pipe 75 and the outlet communicating pipe 76, the other end of the outlet communicating pipe 76 is communicated with the bottom of the outlet area 72, and one side of the outlet area 72 is provided with the outlet tank overflow plate 73. Water enters the outlet water tank 74 from the outlet area 72 through the outlet communicating pipe 76, and when the water level of the part rises, the water enters the other part of the outlet water tank 74 through the outlet water tank overflow plate 73 and flows out from the outlet pipe 75. A second clamping groove 77 is arranged on one side of the water outlet area 72, a second adjusting rod 78 is arranged on the lower portion of the water outlet water tank 74, and the water outlet water tank 74 is clamped on one side of the water outlet area 72 through the second clamping groove 77 and is adjusted up and down through the second adjusting rod 78. The water outlet plate 71 is communicated with the water outlet area 72 and the sand box 2, the water outlet plate 71 comprises a sieve plate and a screen, a plurality of small holes are formed in the sieve plate, the screen is adhered to the sieve plate, the screen is a high-density nylon screen, and the mesh of the high-density nylon screen is between 100 meshes and 400 meshes and is used for uniformly distributing water and simultaneously preventing clay and coarse sand from entering the water outlet tank 74. The sand box 2 is communicated with the water outlet device 7 through a water outlet plate 71. The restored groundwater flows out through the effluent tank overflow plate 73.
The use method of the in-situ chemical oxidation repair device for simulating the polluted underground water comprises the following steps:
adjusting the heights of the water inlet tank and the water outlet tank according to requirements, injecting underground water into the water inlet tank, controlling the height of the water inlet level to simulate confined water or a diving aquifer, and enabling the underground water to enter a water distribution area through an overflow plate of the water inlet tank and then penetrate into the simulated aquifer through a water distribution plate;
injecting organic polluted underground water into a pollution source leakage groove, and allowing organic matters to leak into the simulated aquifer;
injecting a liquid remediation agent into the first injection well;
after entering the simulated aquifer from the water inlet tank, the groundwater is mixed with the organic polluted groundwater to form polluted feather, the polluted feather is repaired by the liquid repairing agent and the permeable reaction grille, the repaired groundwater flows to the water outlet tank through the water outlet area, then flows through the overflow plate of the water outlet tank, flows to the other half of the water outlet tank, and flows out from the water outlet pipe.
The invention combines the controlled slow release technology and the in-situ permeable reactive barrier technology, and is particularly suitable for repairing the groundwater polluted by low-concentration organic matters. The permeable reactive barrier injection well and the first injection well can be matched according to the target, and are suitable for underground water polluted by organic substances with different properties and different concentrations. The method carries out laboratory simulation on the concentration distribution, the spatial distribution and the remediation mechanism of the pollutants in the polluted groundwater after the remediation agent is added, and reduces the difference between the laboratory simulation environment and the actual site remediation environment, so that accurate decision is made on the information such as the adding position and the adding amount of the remediation agent, and objective theoretical reference is provided for the engineering application of the groundwater in-situ chemical oxidation remediation technology.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention. It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. The in-situ chemical oxidation repair device for simulating polluted underground water is characterized in that: comprises a water inlet device (1), a sand box (2), a repairing unit (3), a simulated aquifer (4), a pollution source leakage groove (5), a monitoring well (6), an online detection device and a water outlet device (7), wherein the water inlet device (1) and the water outlet device (7) are respectively arranged at two sides of the sand box (2), the water inlet device (1) and the water outlet device (7) are respectively communicated with two sides of the sand box (2), the repairing unit (3) is arranged at the middle part of the sand box (2), the repairing unit (3) comprises a plurality of permeable reaction grid injection wells (31) and a first injection well (32) which are vertically arranged, the permeable reaction grid injection wells (31) comprise a second injection well (311) and a permeable reaction grid (312), and the permeable reaction grid (312) is arranged in the second injection well (311), simulation aquifer (4) level shop in sand box (2), pollution source leakage groove (5) set up in sand box (2) upper portion, and be close to this one side of water installations (1), the play water end of pollution source leakage groove (5) is located below simulation aquifer (4) upper surface, monitoring well (6) set up perpendicularly in sand box (2), and be located and be close to this one side of water installations (7), on-line measuring equipment install in monitoring well (6).
2. The device for simulating in-situ chemical oxidation remediation of polluted groundwater as claimed in claim 1, wherein: a plurality of holes are formed in the wall of the first injection well (32), the second injection well (311) and the monitoring well (6), and gauze is arranged outside the first injection well (32), the second injection well (311) and the monitoring well (6).
3. The in-situ chemical oxidation remediation device for simulating contaminated groundwater according to any one of claims 1-2, wherein: the water inlet device (1) comprises a water inlet tank (11), a water inlet tank overflow plate (12), a water distribution area (13) and a water distribution plate (14), wherein the water inlet tank overflow plate (12) is arranged inside the water inlet tank (11) and is divided into two parts, the bottom of the water inlet tank (11) is respectively connected with a water inlet pipe (15) and a water inlet communicating pipe (16), the other end of the water inlet communicating pipe (16) is communicated with the bottom of the water distribution area (13), one side of the water distribution area (13) is the water distribution plate (14), the water inlet tank (11) can be arranged on one side of the water distribution area (13) in a vertically adjustable mode, and the water distribution plate (14) is communicated with the water distribution area (13) and the sand box (2).
4. The in-situ chemical oxidation remediation device for simulating contaminated groundwater according to any one of claims 1-2, wherein: the water outlet device (7) comprises a water outlet plate (71), a water outlet area (72), a water outlet tank overflow plate (73) and a water outlet tank (74), wherein the water outlet tank overflow plate (73) is arranged inside the water outlet tank (74) to divide the water outlet tank (74) into two parts, the bottom of the water outlet tank (74) is respectively connected with a water outlet pipe (75) and a water outlet communicating pipe (76), the other end of the water outlet communicating pipe (76) is communicated with the bottom of the water outlet area (72), the water outlet tank overflow plate (73) is arranged on one side of the water outlet area (72), the water outlet tank (74) can be arranged on one side of the water outlet area (72) in an up-and-down adjusting mode, and the water outlet plate (71) is communicated with the water outlet area (72) and the sand box (2).
5. The in-situ chemical oxidation remediation device for simulating contaminated groundwater according to any one of claims 1-2, wherein: the simulated water-bearing stratum (4) sequentially comprises a first clay layer (41), a coarse sand layer (42) and a second clay layer (43) from bottom to top, the clay particle size of the first clay layer (41) and the clay particle size of the second clay layer (43) are smaller than 0.25mm, and the particle size of the coarse sand layer (42) is 0.5-2.0 mm.
6. The in-situ chemical oxidation remediation device for simulating contaminated groundwater according to any one of claims 1-2, wherein: the pollution source leakage groove (5) is trapezoidal, and a plurality of water outlet holes are formed in the bottom surface and the trapezoidal surface of the pollution source leakage groove (5).
7. The in-situ chemical oxidation remediation device for simulating contaminated groundwater according to any one of claims 1-2, wherein: the sand box device is characterized by further comprising a sealing cover (21), wherein the sealing cover (21) is connected with the upper surface of the sand box (2) in a sealing mode.
8. The in-situ chemical oxidation remediation device for simulating contaminated groundwater according to any one of claims 1-2, wherein: a plurality of sampling ports (22) are uniformly formed in the front side of the sand box (2).
9. The use method of the device for simulating in-situ chemical oxidation remediation of polluted groundwater according to any one of claims 1 to 8, characterized by comprising the following steps:
injecting underground water into a water inlet device, and controlling the height of the water inlet level to simulate confined water or a diving aquifer;
injecting organic polluted underground water into a pollution source leakage groove, and allowing organic matters to leak into the simulated aquifer;
injecting a liquid remediation agent into the first injection well;
the groundwater enters the simulated aquifer from the water inlet tank and is mixed with the organic polluted groundwater to form polluted feather, the liquid remediation agent and the permeable reactive barrier are used for remedying the polluted feather, and the remediated groundwater flows out of the water outlet device.
10. The use method of the device for simulating in-situ chemical oxidation remediation of polluted groundwater according to claim 9, wherein the device comprises: groundwater enters the simulated aquifer from the water intake device in a seepage manner.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911358374.XA CN110947752A (en) | 2019-12-25 | 2019-12-25 | In-situ chemical oxidation remediation device for simulating polluted underground water and using method |
Applications Claiming Priority (1)
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| CN111484143A (en) * | 2020-04-07 | 2020-08-04 | 东南大学 | Box device for simulating field PRB technology to repair polluted underground water |
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| CN112113883A (en) * | 2020-08-31 | 2020-12-22 | 河海大学 | System and method for monitoring transport of underground water solute in river subsurface |
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| CN111484143A (en) * | 2020-04-07 | 2020-08-04 | 东南大学 | Box device for simulating field PRB technology to repair polluted underground water |
| CN111589855A (en) * | 2020-05-09 | 2020-08-28 | 北京泷涛环境修复有限公司 | Method and experimental device for repairing petroleum hydrocarbon pollution of heterogeneous aquifer |
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| CN112718830A (en) * | 2020-12-09 | 2021-04-30 | 森特士兴集团股份有限公司 | Soil and groundwater restoration simulation system based on in-situ steam injection |
| CN112816393A (en) * | 2021-03-19 | 2021-05-18 | 矿冶科技集团有限公司 | Permeable reactive barrier testing device and permeable reactive barrier testing method |
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