CN113083883A - Contaminated site heat-preservation in-situ remediation system and method - Google Patents
Contaminated site heat-preservation in-situ remediation system and method Download PDFInfo
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- CN113083883A CN113083883A CN202110342555.4A CN202110342555A CN113083883A CN 113083883 A CN113083883 A CN 113083883A CN 202110342555 A CN202110342555 A CN 202110342555A CN 113083883 A CN113083883 A CN 113083883A
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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
- B09C1/085—Reclamation of contaminated soil chemically electrochemically, e.g. by electrokinetics
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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
- B09C1/02—Extraction using liquids, e.g. washing, leaching, flotation
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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
- B09C1/06—Reclamation of contaminated soil thermally
- B09C1/062—Reclamation of contaminated soil thermally by using electrode or resistance heating elements
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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
- B09C1/10—Reclamation of contaminated soil microbiologically, biologically or by using enzymes
- B09C1/105—Reclamation of contaminated soil microbiologically, biologically or by using enzymes using fungi or plants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
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Abstract
A heat-preservation in-situ remediation system and a heat-preservation in-situ remediation method for a contaminated site belong to the technical field of soil remediation. The repair system comprises a heat-preservation electric forced washing box, a forced washing liquid circulating device, a washing gas tank and a photovoltaic wind power device. Heavy metal ions in the soil migrate to the strong washing liquid collector under the action of electric field force and leaching on one hand, and are absorbed by the super-enriched plants on the other hand, so that the heavy metal ions are removed from the soil. Meanwhile, the soil is heated, and organic matters in the soil volatilize out of the soil to form waste gas and are treated. The invention has the advantages of good restoration effect, short restoration period, no secondary pollution, small capital investment, convenient maintenance, low energy consumption and better restoration effect on polluted sites, and is suitable for local conditions.
Description
Technical Field
The invention belongs to the technical field of soil remediation, and particularly relates to a heat-preservation in-situ remediation system for a contaminated site.
Background
Soil is an important component constituting an ecosystem, is one of the most important environmental factors, and is the foundation of agricultural production and urban construction. With the rapid development of industrial and agricultural production and the continuous acceleration of urbanization process, heavy metals and organic pollutants are increasingly accumulated in soil, complex interaction among the pollutants forms composite pollution, and at present, organic-inorganic composite pollution is one of the basic characteristics of soil pollution in China. There are also many reports on the definition and research on the remediation of complex contaminated soil, and the research on the remediation of complex contaminated soil has become an increasingly active field of environmental science.
The method for treating the heavy metal pollution of the soil mainly comprises a physical method, a chemical method and an ecological restoration method, and each method has the advantages, the advantages and the disadvantages.
The electric restoration technology has the advantages of small influence on the field environment, energy conservation, economy, feasibility, good treatment effect and the like. Phytoremediation is a novel heavy metal contaminated soil treatment method, so that environmental pollution can be repaired by a green treatment technology, and compared with the traditional chemical remediation, physical remediation and engineering remediation, the phytoremediation method has the advantages of attractive appearance, low investment and maintenance cost, simplicity in operation, no secondary pollution and the like.
Chinese patent 201611261437.6 discloses an in-situ electro-phytoremediation device for heavy metal contaminated soil, which comprises a power supply, a cathode region, an anode region and a soil remediation region. The power supply is a direct current power supply; the cathode area comprises a cathode pump A, a cathode working solution adding pipe, a cathode working solution processing box, a cathode pump B, a cathode switch, a cathode working solution discharging pipe, a cathode electrode and a cathode electrode protecting pipe; the anode area comprises an anode pump A, an anode working solution adding pipe, an anode working solution processing box, an anode pump B, an anode switch, an anode working solution discharging pipe, an anode electrode and an anode electrode protecting pipe; the soil restoration area comprises a plant restoration layer and an electric restoration layer, and the plant restoration layer is used for planting hyper-enriched plants. The patent has higher treatment efficiency on the heavy metal contaminated soil, but has the problem of more equipment.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in order to overcome and solve the problems of the traditional repair technology and the patents, the invention provides a heat-preservation in-situ repair system for a polluted site. The in-situ remediation method can be used for restoring the polluted site in situ without destroying the original soil environment, and is short in remediation time and high in efficiency.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the utility model provides a contaminated site heat preservation normal position repair system, contaminated site heat preservation normal position repair system including the electronic strong case 1 that washes of heat preservation, strong lotion circulating device 2, gas washing tank 3 and photovoltaic wind power generation device 4.
The heat-preservation electric strong washing box 1 comprises a box body framework 1-1, a box body 1-2, partition boards 1-3, heat-preservation rolling curtains 1-4, a plant culture layer 1-5, a tap water sprayer, a gas collecting pipe 1-6, a horizontally-arranged anode 1-7, a horizontally-arranged cathode 1-8, a power supply 9, a strong washing liquid percolator 1-10, a strong washing liquid collector 1-11 and an electric heating device 1-12.
The box body 1-2 is fixed on the outer side of the box body framework 1-1, and the box top of the box body 1-2 is of an inclined glass structure. The box wall of the box body 1-2 comprises an inner lining layer, a heat preservation layer and an outer protection layer.
The partition boards 1-3 are used for water insulation and heat preservation.
The heat-preservation roller shutters 1-4 are positioned at the upper part of the box top, the length of the heat-preservation roller shutters 1-4 is the same as that of the box top, and the heat-preservation roller shutters 1-4 are rolled up and spread through ropes.
The plant culture layer 1-5 is arranged on the upper surface of a soil block to be repaired, the plant culture layer 1-5 is prepared by mixing local soil and animal manure according to the volume ratio of 1:1, the thickness of the plant culture layer 1-5 is 20-50 cm, and the plant culture layer 1-5 is used for selecting plants with super-enrichment capacity on heavy metals.
The tap water sprayer sprays and irrigates the plant culture layers 1-5.
The gas collecting pipes 1-6 are arranged at the top of the heat-preservation electric strong washing box 1.
The horizontally placed anodes 1-7 are made of graphite or metal materials, and the horizontally placed anodes 1-7 are buried at the bottoms of the plant culture layers 1-5 when working. The horizontal anodes 1-7 are provided with a plurality of parallel anodes in space.
The horizontal cathodes 1-8 are made of graphite or metal materials, the horizontal cathodes 1-8 are buried in soil to be repaired when working, and the buried depth is determined by experiments; when the horizontal cathodes 1-8 work, the horizontal cathodes are horizontally arranged and are parallel to the horizontal anodes 1-7 in space. The horizontal cathodes 1-8 are provided with a plurality of cathodes which are parallel to each other in space.
The power supply 1-9 is a direct current power supply, the anode of the power supply 1-9 is connected with the horizontally arranged anode 1-7 through a lead, and the cathode of the power supply 1-9 is connected with the horizontally arranged cathode 1-8 through a lead.
The pipelines of the strong washing liquid percolator 1-10 are provided with a plurality of percolators with downward openings, and the pipelines of the strong washing liquid percolator 1-10 are arranged in parallel or in concentric circles and are connected with each other through pipelines. The strong washing liquid percolator 1-10 is buried at the middle lower part of the plant culture layer 1-5.
The pipelines of the strong washing liquid collectors 1-11 are provided with a plurality of collecting ports with openings facing any direction. The strong lotion collector 1-11 has several pipelines, which are parallel in space and connected via pipeline.
The electric heating devices 1-12 comprise a plurality of electric heating plug rods, cables and controllers. The electric heating plunger is evenly and vertically inserted into the soil.
The strong washing liquid circulating device 2 comprises a strong washing liquid front pump 2-1, a strong washing liquid ion exchange filter tower 2-2, a strong washing liquid storage tank 2-3 and a strong washing liquid rear pump 2-4.
One end of the strong washing liquid pre-pump 2-1 is connected with a strong washing liquid collector 1-11 through a pipeline, and the other end of the strong washing liquid pre-pump 2-1 is connected with a water inlet pipe 2-5 of the strong washing liquid ion exchange filter tower 2-2 through a pipeline.
The strong washing liquid ion exchange filter tower 2-2 comprises a water inlet pipe 2-5, a water distributor 2-6, biological fillers 2-7, ion exchange filter materials 2-8, a filter material support frame 2-9, an air inlet 2-10, an air outlet 2-11 and a water outlet pipe 2-12. One end of a water inlet pipe 2-5 of the strong washing liquid ion exchange filter tower 2-2 is connected with a strong washing liquid pre-pump 2-1, and the other end is connected with a water distributor 2-6; biological fillers 2-7 and ion exchange filter materials 2-8 are arranged below the water distributor 2-6 in sequence; the ion exchange filter material 2-8 is placed on the filter material support frame 2-9, and the particle size of the ion exchange filter material 2-8 gradually decreases from top to bottom; the bottom of the strong washing liquid ion exchange filter tower 2-2 is provided with an air inlet 2-10 and a water outlet pipe 2-12; the top of the strong washing liquid ion exchange filter tower 2-2 is provided with an air outlet 2-11.
A water outlet pipe 2-12 of the strong washing liquid ion exchange filter tower 2-2 is communicated with a strong washing liquid storage tank 2-3.
The strong washing liquid storage tank 2-3 is communicated with a strong washing liquid adding and reducing device 2-13.
One end of the strong washing liquid postposition pump 2-4 is communicated with the strong washing liquid storage tank 2-3 through a pipeline, and the other end of the strong washing liquid postposition pump 2-4 is communicated with the strong washing liquid percolator 1-10 through a pipeline.
The gas washing tank 3 comprises a fan, an air inlet pipe 3-1, a gas distribution pipe 3-2, a photocatalytic oxidation area 3-3, an alkaline washing area 3-4, a demisting device 3-5, an active carbon adsorption layer 3-6 and an exhaust fan 3-7.
One end of the fan is connected with the gas collecting pipe 1-6 through a pipeline, and the other end of the fan is connected with the gas inlet pipe 3-1.
The air inlet pipe 3-1 and the air distribution pipe 3-2 are arranged at the bottom of the washing gas tank 3.
The photocatalytic oxidation area 3-3 is positioned at the upper part of the gas distribution pipe 3-2; an ultraviolet generator 3-9 and a catalytic device 3-10 are arranged in the photocatalytic oxidation zone 3-3; the ultraviolet light generator 3-9 comprises a controller, a ballast and an ultraviolet light lamp tube; the catalytic device 3-10 is aluminum-based TiO2And the net is surrounded outside the ultraviolet lamp tube.
The alkaline washing area 3-4 is provided with an alkaline washing assembly, and the alkaline washing assembly comprises an alkaline washing liquid spraying device 3-11 positioned at the upper part of the alkaline washing assembly, an alkaline washing liquid storage tank 3-12 positioned at the lower part of the alkaline washing assembly and an alkaline washing liquid circulating pump 3-13 for pumping alkaline washing liquid in the alkaline washing liquid storage tank 3-12 into the alkaline washing liquid spraying device 3-11.
The upper part of the alkaline washing area 3-4 is provided with a demisting device 3-5, and the demisting device 3-5 collects large liquid drops in the gas and returns the liquid drops to reduce moisture in the gas.
The upper part of the demisting device 3-5 is provided with an active carbon adsorption layer 3-6, and active carbon is arranged in the active carbon adsorption layer 3-6. The top of the washing gas tank is provided with an exhaust fan 3-7.
The photovoltaic wind power device 4 is provided with a vertical rod, a fan blade, a wind driven generator, a photovoltaic panel, a battery pack and a controller; the vertical rod is vertically arranged at the top of the gas washing tank 3, and is of a telescopic structure, so that the length can be adjusted; the fan blades and the wind driven generator are arranged on the top of the vertical rod; the photovoltaic panel is arranged on one side surface of the washing gas tank 3; the battery pack and the controller are arranged at the side part of the washing gas tank 3.
Furthermore, the heat-insulating roller shutters 1-4 are composed of an upper layer, a middle layer and a lower layer, the upper layer and the lower layer are made of rice straws, wheat straws or cotton quilts, and the middle layer is made of plastic films, so that the functions of moisture prevention and rain prevention are achieved; when sunlight is sufficient in the daytime, the heat-preservation roller shutters 1-4 are rolled up, the sunlight irradiates the interior of the box body, the temperature in the box body rises, and the heat-preservation roller shutters 1-4 are spread at night to achieve the purpose of heat preservation.
Further, the box body framework 1-1 is made of wood or stainless steel materials through welding, and the box body framework 1-1 is of a cuboid structure.
Furthermore, the box body 1-2 is of a cuboid structure, and the box body 1-2 is formed by five planes of upright four-side box walls and an inclined box roof. The lining layer of the box wall of the box body 1-2 is made of a wood board or a polyurethane waterproof foam board; the heat-insulating layer is made of waterproof heat-insulating material; the outer protective layer is made of wood plates or polyurethane waterproof foam plates.
Further, the top of the box body 1-2 is an inclined glass structure with a metal frame.
Further, the partition boards 1-3 are made of stainless steel plates or hard plastic plates.
Further, the shape of the horizontally arranged anode 1-7 is cylindrical or cuboid; the size of the horizontal anodes 1-7 is determined according to the size of the land of the soil to be treated and the depth experiment of soil pollution.
Further, the shape of the flat cathode 1-8 is cylindrical or cuboid; the size of the horizontal cathodes 1-8 is determined by the size of the plot of soil to be treated and the depth of soil contamination.
Further, the strong washing liquid percolator 1-10 is made of a PV plastic pipe or a stainless steel pipe, and the diameter of the strong washing liquid percolator is 20-50 mm.
Further, the strong washing liquid collector 1-11 is made of a PV plastic tube or a stainless steel tube, and the diameter of the strong washing liquid collector is 50-100 mm.
Further, the strong washing liquid in the strong washing liquid storage tank 2-3 is dipotassium hydrogen phosphate solution.
Furthermore, the biological filler 2-7 is mainly spherical biological filter material, and the spherical biological filter material is one or more of modified fiber ball filter material, spherical ceramic material, biological shale ceramsite, medical stone filter material and volcanic stone filter material.
Furthermore, the ion exchange filter materials 2 to 8 adopt different ion exchange resins according to the types of the heavy metals.
Further, the demister 3-5 operates on the principle that gas enters the demister 3-5, passes through a series of bends, and exits at the top, while water droplets, due to their mass and kinetic energy, fall straight down on the bend portion, impact the surface of the demister, and rebound under the action of gravity.
Furthermore, the activated carbon in the activated carbon adsorption layers 3-6 is required to have the advantages of developed pores, large specific surface area, high adsorption speed, friction resistance, flushing resistance and the like, and when the activated carbon is found to be sticky after a long time of operation, the activated carbon needs to be replaced in time when the air speed is reduced.
Furthermore, the middle of the gas washing tank 3 is cylindrical, the upper end of the gas washing tank is conical, an observation port and an overhaul and replacement port are formed in the tank, and the volume of the tank can be determined according to the amount of gas to be treated and is vertically placed; the alkaline washing solution storage tank 3 is matched with a cylindrical tank body of the washing gas tank 3, the cross section of the alkaline washing solution storage tank 3-12 is circular, an alkaline washing solution gathering device 3-14 is arranged above the alkaline washing solution storage tank 3-12, the diameter of the lower end of the alkaline washing solution gathering device 3-14 is smaller than the diameter of the uppermost part of the alkaline washing solution storage tank 3-12, and the alkaline washing solution gathering device 3-14 can enable alkaline washing solution to gather and flow back to the alkaline washing solution storage tank 3-12.
Further, the alkaline washing component is also provided with an alkaline washing liquid adding and discharging device 3-15, the alkaline washing liquid adding and discharging device 3-15 comprises an alkaline washing liquid tank and a stirring device, and the alkaline washing liquid adding and discharging device 3-15 is communicated with an alkaline washing liquid circulating pump 3-13 through a pipeline and a valve.
Further, the alkali wash spraying devices 3-11 are spiral spraying devices; the sprayed liquid is in a foggy shape, the water mist is fused in a cross mode, no dead angle is left, the contact area of gas and solution is favorably enlarged, and the absorption rate and the absorption effect are improved.
Further, the alkaline washing component adopts alkaline washing liquid which is sodium hydroxide solution; the proportioning concentration of the alkaline washing liquid is determined according to the gas amount to be treated and the gas concentration experiment.
Furthermore, the ultraviolet lamp tube is a high-intensity and high-ozone ultraviolet lamp tube.
Furthermore, the wave trough of the demisting device 3-5 is provided with drainage channels 3-16 which are uniformly distributed. After the liquid drops are gathered, the liquid drops flow downwards step by step through the drainage grooves 3-16 and finally flow into the water collecting bins 3-17, and the liquid is collected and treated uniformly through the water collecting bins 3-17, so that the liquid is prevented from flowing to the side surface, and the influence on other equipment is prevented.
Further, the lowest part of the scrubber tank 3 is provided with three legs 3-8.
The method for repairing the polluted site by adopting the heat-preservation in-situ repair system for the polluted site comprises the following steps:
the method comprises the steps of firstly, digging a rectangular groove on a soil plot to be restored, wherein the size, the shape and the depth of the rectangular groove are matched with those of a heat-preservation electric strong washing box 1, digging a plurality of parallel grooves in a rectangle surrounded by the rectangular groove, arranging a partition plate 1-3 in the rectangular groove, arranging a box body framework 1-1, a box body 1-2 and a heat-preservation roller shutter 1-4 on the upper portion of the partition plate 1-3, arranging a strong washing liquid collector 1-11 at the bottom of the parallel groove, and arranging a flat cathode 1-8 on the upper portion of the strong washing liquid collector 1-11.
Secondly, a plurality of horizontal anodes 1-7 are arranged on the upper part of the polluted soil, and the horizontal anodes 1-7 and the horizontal cathodes 1-8 are in a parallel state in space. The upper part of the horizontal anode 1-7 is provided with a strong washing liquid percolator 1-10. The electric heating plunger is evenly and vertically inserted into the polluted soil.
Filling the plant culture layer 1-5, and selecting the plant with the heavy metal super-enrichment capacity from the plant culture layer 1-5.
And fourthly, the strong washing liquid percolator 1-10 seeps out the strong washing liquid, heavy metal ions in the soil migrate to the horizontal cathode 1-8 under the action of the electric field force, the strong washing liquid flows to the strong washing liquid collector 1-11 under the action of gravity, the leaching effect is generated on the polluted soil, and the heavy metal ions in the soil are transferred to the strong washing liquid.
Fifthly, the strong washing liquid in the strong washing liquid collector 1-11 enters the strong washing liquid ion exchange filter tower 2-2 through the water inlet pipe 2-5 of the strong washing liquid ion exchange filter tower 2-2 and the water distributor 2-6 of the strong washing liquid ion exchange filter tower 2-2 under the action of the strong washing liquid pre-pump 2-1, the strong washing liquid flows through the biological filler 2-7, an aerobic environment is formed on the surface of the biological filler 2-7, an anaerobic environment is formed inside the biological filler 2-7, ammonia nitrogen and total nitrogen in water are well removed, the ion exchange filter material 2-8 and strong washing liquid are subjected to exchange reaction, heavy metal ions are exchanged into the ion exchange filter material 2-8, meanwhile, the strong washing liquid is filtered by the ion exchange filter material 2-8, and the strong washing liquid treated by the strong washing liquid ion exchange filter tower 2-2 enters a strong washing liquid storage tank 2-3.
And sixthly, adding or discharging the strong washing liquid by the strong washing liquid adding and reducing device 2-13 according to the height of the liquid level of the strong washing liquid, and enabling the strong washing liquid in the strong washing liquid storage tank 2-3 to enter the strong washing liquid percolator 1-10 under the action of the strong washing liquid postposition pump 2-4 for recycling.
And seventhly, the ion exchange filter material 2-8 is required to be replaced and regenerated after being saturated.
The electric heating rod heats the soil, and organic matters in the soil volatilize out of the soil to form waste gas.
Ninthly, the waste gas firstly enters a photocatalytic oxidation area 3-3 of the gas washing tank 3 through a gas collecting pipe 1-6 and a fan, the high-intensity and high-ozone ultraviolet lamp tube emits high-energy ultraviolet light beams and ozone to irradiate the waste gas, the waste gas is subjected to synergistic decomposition under the action of a catalytic device 3-10, and pollutants in the waste gas are decomposed into micromolecular substances; the gas continuously rises to contact with the alkaline washing liquid sprayed by the alkaline washing liquid spraying device 3-11, pollutants in the gas and the alkaline washing liquid are subjected to chemical reaction, and reaction products flow into the lower alkaline washing liquid storage tank 3-12 along with the alkaline washing liquid; the gas then enters a demisting device 3-5 where liquid droplets in the gas are intercepted; then the gas enters the activated carbon adsorption layers 3-6, substances and liquid drops mixed in the gas are intercepted and adsorbed, and the waste gas is treated into clean gas so as to achieve standard emission.
The invention has the beneficial effects that: heavy metal ions in the soil migrate to the strong washing liquid collector under the action of electric field force and leaching on one hand, and are absorbed by the super-enriched plants on the other hand, so that the heavy metal ions are removed from the soil. Meanwhile, the soil is heated, and organic matters in the soil volatilize out of the soil to form waste gas and are treated. The invention has the advantages of good restoration effect, short restoration period, no secondary pollution, small capital investment, convenient maintenance, low energy consumption and better restoration effect on polluted sites, and is suitable for local conditions.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic structural diagram of a heat-insulating electric forced washing tank according to an embodiment of the present invention;
in fig. 1: 1. the device comprises a heat-preservation electric strong washing box, 1-1 of a box body framework, 1-2 of a box body, 1-3 of a partition board, 1-4 of a heat-preservation roller shutter, 1-5 of a plant culture layer, 1-6 of a gas collecting pipe, 1-7 of a horizontally-arranged anode, 1-8 of a horizontally-arranged cathode, 1-9 of a power supply, 1-10 of a strong washing liquid percolator, 1-11 of a strong washing liquid collector and 1-12 of an electric heating device.
FIG. 2 is a schematic structural diagram of a strong washing liquid circulating device according to an embodiment of the present invention.
In fig. 2: 2. the device comprises a strong washing liquid circulating device, 2-1 parts of a strong washing liquid front pump, 2-2 parts of a strong washing liquid ion exchange filter tower, 2-3 parts of a strong washing liquid storage tank, 2-4 parts of a strong washing liquid rear pump, 2-5 parts of a water inlet pipe, 2-6 parts of a water distributor, 2-7 parts of biological filler, 2-8 parts of an ion exchange filter material, 2-9 parts of a filter material support frame, 2-10 parts of an air inlet, 2-11 parts of an air outlet, 2-12 parts of a water outlet pipe and 2-13 parts of a strong washing liquid adding and reducing device.
Fig. 3 is a schematic structural view of a scrubber tank according to an embodiment of the present invention.
In fig. 3: 3. the device comprises a washing gas tank, 3-1 parts of a gas inlet pipe, 3-2 parts of a gas distribution pipe, 3-3 parts of a photocatalytic oxidation area, 3-4 parts of an alkali washing area, 3-5 parts of a demisting device, 3-6 parts of an activated carbon adsorption layer, 3-7 parts of an exhaust fan, 3-8 parts of supporting legs, 3-9 parts of an ultraviolet light generator, 3-10 parts of a catalytic device, 3-11 parts of an alkali washing liquid spraying device, 3-12 parts of an alkali washing liquid storage tank, 3-13 parts of an alkali washing liquid circulating pump, 3-14 parts of an alkali washing liquid gathering device, 3-15 parts of an alkali washing liquid adding and discharging device, 3-16 parts of a water discharging tank, 3-17 parts of a water accumulation bin and 4 parts of a photovoltaic wind power.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
Examples
The heat-preservation in-situ remediation system for the polluted site, which is shown in the figures 1-3, comprises a heat-preservation electric strong washing tank 1, a strong washing liquid circulating device 2, a washing gas tank 3 and a photovoltaic wind power device 4.
The heat-preservation electric strong washing box 1 comprises a box body framework 1-1, a box body 1-2, partition boards 1-3, heat-preservation rolling curtains 1-4, a plant culture layer 1-5, a tap water sprayer, a gas collecting pipe 1-6, a horizontally-arranged anode 1-7, a horizontally-arranged cathode 1-8, a power supply 1-9, a strong washing liquid percolator 1-10, a strong washing liquid collector 1-11 and an electric heating device 1-12.
The box body framework 1-1 is made of wood or stainless steel materials in a welding mode, and the box body framework 1-1 is of a cuboid structure.
The box body 1-2 is of a cuboid structure, the box body 1-2 is fixed on the outer side of the box body framework 1-1, and the box body 1-2 is formed by five planes of upright four-side box walls and an inclined box top in a surrounding mode. Each vertical box wall comprises an inner lining layer, a heat insulation layer and an outer protection layer, wherein the inner lining layer is made of wood plates or polyurethane waterproof foam plates; the heat-insulating layer is made of waterproof heat-insulating material; the outer protective layer is made of wood plates or polyurethane waterproof foam plates.
The inclined box top is of a glass type structure with a metal frame.
The partition plates 1-3 are made of stainless steel plates or hard plastic plates.
The heat-preservation roller shutter 1-4 is positioned at the upper part of the inclined box top and is a roller shutter formed by an upper layer, a middle layer and a lower layer of materials, the upper layer and the lower layer are made of rice straws or wheat straws or cotton quilts, the middle layer adopts a plastic film to play a role in resisting moisture and rain, the length of the roller shutter is the same as that of the inclined box top, the roller shutter is rolled up and spread through a rope, when sunlight is sufficient in the daytime, the roller shutter is rolled up, the sunlight irradiates into the box body 1-2, the temperature in the box body 1-2 is raised, and the roller shutter is spread at night, so that the purpose of heat preservation is achieved.
The plant culture layer 1-5 is arranged on the upper surface of a soil block to be repaired, the plant culture layer 1-5 is prepared by mixing local soil and animal manure according to the volume ratio of 1:1, the thickness of the plant culture layer 1-5 is 50cm, and the plant culture layer 1-5 is used for selecting plants with super enrichment capacity to heavy metals.
The tap water sprayer sprays and irrigates the plant culture layers 1-5.
The gas collecting pipes 1-6 are arranged at the top of the heat-preservation electric strong washing box 1.
The horizontally placed anodes 1-7 are made of graphite or metal materials, and the horizontally placed anodes 1-7 are cylindrical or cuboid; the size of the horizontal anodes 1-7 is determined according to the size of the land of the soil to be treated and the depth experiment of soil pollution. The flat anodes 1-7 are embedded at the bottom of the plant culture layer 1-5 when working. The horizontal anodes 1-7 are provided with a plurality of parallel anodes in space.
The horizontal cathodes 1-8 are made of graphite or metal materials, and the horizontal cathodes 1-8 are cylindrical or cuboid; the size of the horizontal cathodes 1-8 is determined by the size of the plot of soil to be treated and the depth of soil contamination. The horizontally placed cathodes 1-8 are buried in the soil to be restored when working, and the buried depth is determined by experiments; when the horizontal cathodes 1-8 work, the horizontal cathodes are horizontally arranged and are parallel to the horizontal anodes 1-7 in space. The horizontal cathodes 1-8 are provided with a plurality of cathodes which are parallel to each other in space.
The power supply 1-9 is a direct current power supply 1-9, the anode of the power supply 1-9 is connected with the flat anode 1-7 through a lead, and the cathode of the power supply 1-9 is connected with the flat cathode 1-8 through a lead.
The strong washing liquid percolator 1-10 is made of a PV plastic pipe, the diameter of the strong washing liquid percolator is 30mm, a plurality of percolation ports with downward openings are arranged on the PV plastic pipe of the strong washing liquid percolator 1-10, the PV plastic pipes of the strong washing liquid percolator 1-10 are arranged in parallel and are connected with each other through a pipeline. The strong washing liquid percolator 1-10 is buried at the middle lower part of the plant culture layer 1-5.
The strong washing liquid collector 1-11 is made of a PV plastic pipe with the diameter of 50mm, and a plurality of collecting ports with openings facing any direction are arranged on the PV plastic pipe of the strong washing liquid collector 1-11. The PV plastic tubes of the strong washing liquid collectors 1-11 are provided with a plurality of PV plastic tubes which are parallel to each other in space, and the PV plastic tubes of the strong washing liquid collectors 1-11 are connected through pipelines.
The electric heating devices 1-12 comprise a plurality of electric heating plug rods, cables and controllers. The electric heating plunger is evenly and vertically inserted into the soil.
The strong washing liquid circulating device 2 comprises a strong washing liquid front pump 2-1, a strong washing liquid ion exchange filter tower 2-2, a strong washing liquid storage tank 2-3 and a strong washing liquid rear pump 2-4.
One end of the strong washing liquid pre-pump 2-1 is connected with a strong washing liquid collector 1-11 through a pipeline, and the other end of the strong washing liquid pre-pump 2-1 is connected with a water inlet pipe 2-5 of the strong washing liquid ion exchange filter tower through a pipeline.
The strong washing liquid ion exchange filter tower comprises a water inlet pipe 2-5, a water distributor 2-6, biological fillers 2-7, ion exchange filter materials 2-8, a filter material support frame 2-9, an air inlet 2-10, an air outlet 2-10 and a water outlet pipe 2-12. One end of a water inlet pipe 2-5 of the strong washing liquid ion exchange filter tower is connected with a strong washing liquid pre-pump, and the other end is connected with a water distributor 2-6; biological fillers 2-7 and ion exchange filter materials 2-8 are arranged below the water distributor 2-6 in sequence; the ion exchange filter material 2-8 is placed on the filter material support frame 2-9, and the particle size of the ion exchange filter material 2-8 gradually decreases from top to bottom; the bottom of the strong washing liquid ion exchange filter tower is provided with an air inlet 2-10 and a water outlet pipe 2-12.
The water outlet pipe 2-12 of the strong washing liquid ion exchange filter tower is communicated with a strong washing liquid storage tank 2-3.
The strong washing liquid storage tank 2-3 is provided with a strong washing liquid adding and reducing device.
One end of the strong washing liquid postposition pump 2-4 is communicated with the strong washing liquid storage tank 2-3 through a pipeline, and the other end of the strong washing liquid postposition pump 2-4 is communicated with the strong washing liquid percolator 1-10 through a pipeline.
Further, the strong washing liquid is dipotassium hydrogen phosphate solution.
Furthermore, the biological filter material is mainly a spherical biological filter material, and the spherical biological filter material is one or more of a modified fiber ball filter material, a spherical ceramic material, a biological shale ceramsite, a medical stone filter material and a volcanic stone filter material.
Furthermore, the ion exchange filter materials 2 to 8 adopt different ion exchange resins according to the types of the heavy metals.
The gas washing tank 3 comprises a fan, an air inlet pipe 3-1, a gas distribution pipe 3-2, a photocatalytic oxidation area 3-3, an alkaline washing area 3-4, a demisting device 3-5, an active carbon adsorption layer 3-6, an exhaust fan 3-7 and supporting legs 3-8.
One end of the fan is connected with the gas collecting pipe 1-6 through a pipeline, and the other end of the fan is connected with the gas inlet pipe 3-1.
The air inlet pipe 3-1 and the air distribution pipe 3-2 are arranged at the bottom of the washing gas tank 3.
The photocatalytic oxidation area 3-3 is positioned at the upper part of the gas distribution pipe 3-2; an ultraviolet generator 3-9 and a catalytic device 3-10 are arranged in the photocatalytic oxidation zone 3-3; the ultraviolet light generator 3-9 comprises a controller, a ballast and an ultraviolet light lamp tube; the catalytic device 3-10 is aluminum-based TiO2And the net is surrounded outside the ultraviolet lamp tube.
The alkaline washing area 3-4 is provided with an alkaline washing assembly, and the alkaline washing assembly comprises an alkaline washing liquid spraying device 3-11 positioned at the upper part of the alkaline washing assembly, an alkaline washing liquid storage tank 3-12 positioned at the lower part of the alkaline washing assembly and an alkaline washing liquid circulating pump 3-13 for pumping alkaline washing liquid in the alkaline washing liquid storage tank 3-12 into the alkaline washing liquid spraying device 3-11.
The upper part of the alkaline washing area 3-4 is provided with a demisting device 3-5, the demisting device 3-5 collects large liquid drops in gas and returns the large liquid drops to reduce moisture in the gas, the working principle is that the gas enters the demisting device 3-5 and passes through a series of bend ways to be discharged from the top, and the water drops fall linearly when passing through the bend ways due to the action of the mass and the kinetic energy of the water drops, collide with the surface of the demisting device 3-5 and rebound under the action of gravity.
The upper parts of the demisting devices 3-5 are provided with active carbon adsorption layers 3-6, active carbon is arranged in the active carbon adsorption layers 3-6, and the active carbon has the advantages of developed pores, large specific surface area, high adsorption speed, friction resistance, flushing resistance and the like, and if the active carbon is found to be sticky after long-time operation, the active carbon needs to be replaced in time when the air speed is reduced.
Specifically, the middle of the gas washing tank 3 is cylindrical, the upper end of the gas washing tank is a conical tank body, the tank body is provided with an observation port and an overhaul and replacement port, and the volume of the tank body can be determined according to the amount of gas to be treated and is vertically placed.
In order to discharge the treated clean gas, an exhaust fan 3-7 is arranged at the conical tank body at the uppermost part of the washing tank 3.
The alkaline washing device is further matched with a cylindrical tank body container, the cross section of the alkaline washing liquid storage tank 3-12 is circular, an alkaline washing liquid gathering device 3-14 is arranged above the alkaline washing liquid storage tank 3-12, the diameter of the lower end of the alkaline washing liquid gathering device 3-14 is smaller than the diameter of the uppermost part of the alkaline washing liquid storage tank 3-12, and the alkaline washing liquid gathering device 3-14 can enable alkaline washing liquid to gather and flow back to the alkaline washing liquid storage tank.
Further, the alkaline washing component is also provided with an alkaline washing liquid adding and discharging device, the alkaline washing liquid adding and discharging device 3-15 comprises an alkaline washing liquid tank and a stirring device, and the alkaline washing liquid adding and discharging device 3-15 is communicated with an alkaline washing liquid circulating pump 3-13 through a pipeline and a valve.
Further, the alkali wash spraying devices 3-11 are spiral spraying devices; the sprayed liquid is in a foggy shape, the water mist is fused in a cross mode, no dead angle is left, the contact area of gas and solution is favorably enlarged, and the absorption rate and the absorption effect are improved.
The alkaline washing component adopts alkaline washing liquid as sodium hydroxide solution; the proportioning concentration of the alkaline washing liquid is determined according to the gas amount to be treated and the gas concentration experiment.
The device is optimized, and the ultraviolet lamp tube is a high-intensity and high-ozone ultraviolet lamp tube.
In a further preferred device, the demisting device 3-5 is a high-efficiency demister. The trough part is provided with evenly distributed drainage channels 3-16. After the liquid drops are gathered, the liquid drops flow downwards step by step through the drainage grooves 3-16 and finally flow into the water collecting bins 3-17, and the liquid is collected and treated uniformly through the water collecting bins 3-17, so that the liquid is prevented from flowing to the side surface, and the influence on other equipment is prevented.
In a further preferred arrangement, the lowest part of the scrubber tank 3 is provided with three legs 3-8.
The photovoltaic wind power device 4 is provided with a vertical rod, a fan blade, a wind driven generator, a photovoltaic panel, a battery pack and a controller.
The vertical rod is vertically arranged at the top of the gas washing tank 3, and the vertical rod is of a telescopic structure and can adjust the length.
The fan blades and the wind driven generator are arranged on the top of the vertical rod.
The photovoltaic panel is arranged on one side surface of the washing gas tank 3.
The battery pack and the controller are arranged at the side part of the washing gas tank 3.
The method for repairing the contaminated site by adopting the heat-preservation in-situ repair system comprises the following steps:
firstly, rectangular grooves are dug on a soil block to be restored, the size, the shape and the depth of each rectangular groove are matched with those of a heat-preservation electric strong washing box 1, a plurality of parallel grooves are dug in a rectangle surrounded by the rectangular grooves, partition plates 1-3 are arranged in the rectangular grooves, box body frameworks 1-1, box bodies 1-2 and heat-preservation roller shutters 1-4 are arranged on the upper portions of the partition plates 1-3, strong washing liquid collectors 1-11 are arranged at the bottoms of the parallel grooves, and flat cathodes 1-8 are arranged on the upper portions of the strong washing liquid collectors 1-11.
Secondly, a plurality of horizontal anodes 1-7 are arranged on the upper part of the polluted soil, and the horizontal anodes 1-7 and the horizontal cathodes 1-8 are in a parallel state in space. The upper part of the horizontal anode 1-7 is provided with a strong washing liquid percolator 1-10. The electric heating plunger is evenly and vertically inserted into the polluted soil.
Filling the plant culture layer 1-5, and selecting the plant with the heavy metal super-enrichment capacity from the plant culture layer 1-5.
And fourthly, the strong washing liquid percolator 1-10 seeps out the strong washing liquid, heavy metal ions in the soil migrate to the flat cathode 1-8 under the action of the electric field force, the strong washing liquid flows to the strong washing liquid collector 1-11 under the action of gravity, the leaching effect is generated on the polluted soil, and the heavy metal ions in the soil are transferred to the strong washing liquid.
Fifthly, the strong washing liquid in the strong washing liquid collector 1-11 enters the strong washing liquid ion exchange filter tower through a water inlet pipe 2-5 of the strong washing liquid ion exchange filter tower and a water distributor 2-6 of the strong washing liquid ion exchange filter tower under the action of a strong washing liquid pre-pump 2-1, an ion exchange filter material 2-8 and the strong washing liquid are subjected to exchange reaction, heavy metal ions are exchanged into the ion exchange filter material 2-8, meanwhile, the strong washing liquid is filtered by the ion exchange filter material 2-8, and the strong washing liquid treated by the strong washing liquid ion exchange filter tower enters a strong washing liquid storage tank 2-3.
And sixthly, adding or discharging the strong washing liquid by the strong washing liquid adding and reducing device according to the height of the liquid level of the strong washing liquid, and enabling the strong washing liquid in the strong washing liquid storage tank 2-3 to enter a strong washing liquid percolator 1-10 under the action of a strong washing liquid postposition pump 2-4 for recycling.
And seventhly, the ion exchange filter material 2-8 is required to be replaced and regenerated after being saturated.
Heating the soil by heat generated by the electric heating rod, and volatilizing organic matters in the soil to overflow the soil to form waste gas.
Ninthly, waste gas firstly enters a photocatalytic oxidation area 3-3 of the gas washing tank 3 through a gas collecting pipe 1-6 and a fan, the high-intensity and high-ozone ultraviolet lamp tube emits high-energy ultraviolet light beams and ozone to irradiate the waste gas, the waste gas is subjected to synergistic decomposition under the action of a catalytic device 3-10, and malodorous pollutants in the waste gas are decomposed into micromolecular substances; the gas continuously rises to contact with the alkaline washing liquid sprayed by the alkaline washing liquid spraying device 3-11, pollutants in the gas and sodium hydroxide are subjected to chemical reaction, and reaction products flow into the lower alkaline washing liquid storage tank 3-12 along with the alkaline washing liquid; the gas then enters a demisting device 3-5 where liquid droplets in the gas are intercepted; then the gas enters the activated carbon adsorption layers 3-6, substances and liquid drops mixed in the gas are intercepted and adsorbed, and the waste gas is treated into clean gas so as to achieve standard emission.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. The heat-preservation in-situ remediation system for the polluted site is characterized by comprising a heat-preservation electric strong washing box (1), a strong washing liquid circulating device (2), a washing gas tank (3) and a photovoltaic wind power device (4);
the heat-preservation electric strong washing box (1) comprises a box body framework (1-1), a box body (1-2), a partition plate (1-3), a heat-preservation roller shutter (1-4), a plant culture layer (1-5), a tap water sprayer, a gas collecting pipe (1-6), a horizontally-arranged anode (1-7), a horizontally-arranged cathode (1-8), a power supply (1-9), a strong washing liquid percolator (1-10), a strong washing liquid collector (1-11) and an electric heating device (1-12);
the box body (1-2) is fixed on the outer side of the box body framework (1-1), and the top of the box body (1-2) is of an inclined glass structure; the box wall of the box body (1-2) comprises an inner liner, a heat preservation layer and an outer protection layer;
the partition plates (1-3) are used for water insulation and heat preservation;
the heat-preservation roller shutters (1-4) are positioned at the upper part of the box top, the length of the heat-preservation roller shutters (1-4) is the same as that of the box top, and the heat-preservation roller shutters (1-4) are rolled up and spread through ropes;
the plant culture layer (1-5) is arranged on the upper surface of a soil block to be repaired, the plant culture layer (1-5) is prepared by mixing local soil and animal manure according to the volume ratio of 1:1, the thickness of the plant culture layer (1-5) is 20-50 cm, and plants with super-enrichment capacity to heavy metals are planted in the plant culture layer (1-5);
the tap water sprayer sprays and irrigates the plant culture layer (1-5);
the gas collecting pipe (1-6) is arranged at the top of the heat-preservation electric strong washing box (1);
the horizontally arranged anodes (1-7) are made of graphite or metal materials; the horizontally arranged anodes (1-7) are buried at the bottom of the plant culture layer (1-5) when working; the horizontal anodes (1-7) are provided with a plurality of parallel anodes in space;
the horizontally arranged cathodes (1-8) are made of graphite or metal materials; when the horizontally arranged cathodes (1-8) work, the horizontally arranged cathodes are buried in soil to be restored, and the buried depth is determined through experiments; when the horizontal cathodes (1-8) work, the horizontal cathodes are horizontally arranged and are parallel to the horizontal anodes (1-7) in space; the horizontal cathodes (1-8) are provided with a plurality of cathodes which are parallel to each other in space;
the power supply (1-9) is a direct current power supply, the positive pole of the power supply (1-9) is connected with the horizontally arranged positive pole (1-7) through a lead, and the negative pole of the power supply (1-9) is connected with the horizontally arranged negative pole (1-8) through a lead;
the pipelines of the strong washing liquid percolator (1-10) are provided with a plurality of percolating ports with downward openings, and the pipelines of the strong washing liquid percolator (1-10) are arranged in parallel or in concentric circles and are connected with each other through pipelines; the strong washing liquid percolator (1-10) is buried at the middle lower part of the plant culture layer (1-5);
a pipeline of the strong washing liquid collector (1-11) is provided with a plurality of collecting ports with openings facing any direction; the pipelines of the strong washing liquid collectors (1-11) are provided with a plurality of pipelines which are parallel in space and connected through pipelines;
the electric heating devices (1-12) comprise a plurality of electric heating plug rods, cables and controllers; the electric heating plunger is uniformly and vertically inserted into the soil;
the strong washing liquid circulating device (2) comprises a strong washing liquid front pump (2-1), a strong washing liquid ion exchange filter tower (2-2), a strong washing liquid storage tank (2-3) and a strong washing liquid rear pump (2-4);
one end of the strong washing liquid pre-pump (2-1) is connected with a strong washing liquid collector (1-11) through a pipeline, and the other end of the strong washing liquid pre-pump (2-1) is connected with a water inlet pipe (2-5) of the strong washing liquid ion exchange filter tower (2-2) through a pipeline;
the strong washing liquid ion exchange filter tower (2-2) comprises a water inlet pipe (2-5), a water distributor (2-6), biological fillers (2-7), ion exchange filter materials (2-8), filter material support frames (2-9), an air inlet (2-10), an air outlet (2-11) and a water outlet pipe (2-12); one end of a water inlet pipe (2-5) of the strong washing liquid ion exchange filter tower (2-2) is connected with a strong washing liquid pre-pump (2-1), and the other end is connected with a water distributor (2-6); biological fillers (2-7) and ion exchange filter materials (2-8) are arranged below the water distributor (2-6) in sequence; the ion exchange filter material (2-8) is placed on the filter material support frame (2-9), and the particle size of the ion exchange filter material (2-8) is gradually reduced from top to bottom; the bottom of the strong washing liquid ion exchange filter tower (2-2) is provided with an air inlet (2-10) and a water outlet pipe (2-12); the top of the strong washing liquid ion exchange filter tower (2-2) is provided with an air outlet (2-11);
a water outlet pipe (2-12) of the strong washing liquid ion exchange filter tower (2-2) is communicated with a strong washing liquid storage tank (2-3);
the strong washing liquid storage tank (2-3) is communicated with a strong washing liquid adding and reducing device (2-13);
one end of the strong washing liquid post pump (2-4) is communicated with the strong washing liquid storage tank (2-3) through a pipeline, and the other end of the strong washing liquid post pump (2-4) is communicated with the strong washing liquid percolator (1-10) through a pipeline;
the washing gas tank (3) comprises a fan, a gas inlet pipe (3-1), a gas distribution pipe (3-2), a photocatalytic oxidation area (3-3), an alkali washing area (3-4), a demisting device (3-5), an active carbon adsorption layer (3-6) and an exhaust fan (3-7);
one end of the fan is connected with the gas collecting pipe (1-6) through a pipeline, and the other end of the fan is connected with the gas inlet pipe (3-1);
the air inlet pipe (3-1) and the air distribution pipe (3-2) are arranged at the bottom of the air washing tank (3);
the photocatalytic oxidation area (3-3) is positioned at the upper part of the gas distribution pipe (3-2); an ultraviolet generator (3-9) and a catalytic device (3-10) are arranged in the photocatalytic oxidation area (3-3); the ultraviolet light generator (3-9) comprises a controller, a ballast and an ultraviolet light lamp tube; the catalytic device (3-10) is aluminum-based TiO2A net surrounding the UV lamp tube;
the alkaline washing area (3-4) is provided with an alkaline washing assembly, and the alkaline washing assembly comprises an alkaline washing liquid spraying device (3-11) positioned at the upper part of the alkaline washing assembly, an alkaline washing liquid storage tank (3-12) positioned at the lower part of the alkaline washing assembly and an alkaline washing liquid circulating pump (3-13) for pumping alkaline washing liquid in the alkaline washing liquid storage tank (3-12) into the alkaline washing liquid spraying device (3-11);
the upper part of the alkali washing area (3-4) is provided with a demisting device (3-5), and the demisting device (3-5) collects large liquid drops in the gas and returns the liquid drops to reduce the moisture in the gas;
the upper part of the demisting device (3-5) is provided with an active carbon adsorption layer (3-6), and active carbon is arranged in the active carbon adsorption layer (3-6); an exhaust fan (3-7) is arranged at the top of the washing gas tank (3);
the photovoltaic wind power device (4) is provided with a vertical rod, a fan blade, a wind driven generator, a photovoltaic panel, a battery pack and a controller; the vertical rod is vertically arranged at the top of the gas washing tank (3), and is of a telescopic structure, so that the length can be adjusted; the fan blades and the wind driven generator are arranged on the top of the vertical rod; the photovoltaic panel is arranged on one side surface of the washing gas tank (3); the battery pack and the controller are arranged on the side part of the washing gas tank (3).
2. The in-situ contaminated site heat-preservation repair system as claimed in claim 1, wherein the heat-preservation roller shutters (1-4) are composed of an upper layer, a middle layer and a lower layer, the upper layer and the lower layer are made of rice straw, wheat straw or cotton quilt, and the middle layer is made of plastic film, so as to play a role in preventing moisture and rain; when sunlight is sufficient in the daytime, the heat-preservation roller shutters (1-4) are rolled up, the sunlight irradiates the interior of the box body, the temperature in the box body is raised, and the heat-preservation roller shutters (1-4) are spread at night to achieve the purpose of heat preservation.
3. The in-situ contaminated site thermal insulation repair system according to claim 1, wherein the box body framework (1-1) is made of wood or stainless steel by welding, and the box body framework (1-1) is of a rectangular parallelepiped structure; the box body (1-2) is of a cuboid structure, and the box body (1-2) is enclosed by five planes of upright four-side box walls and an inclined box top; the inner liner of the box wall of the box body (1-2) is made of a wood board or a polyurethane waterproof foam board; the heat-insulating layer is made of waterproof heat-insulating material; the outer protective layer is made of wood plates or polyurethane waterproof foam plates; the top of the box body (1-2) is an inclined glass structure with a metal frame; the partition plates (1-3) are made of stainless steel plates or hard plastic plates.
4. The in-situ contaminated site thermal insulation repair system according to claim 1, wherein the shape of the horizontally placed anodes (1-7) is cylindrical or rectangular parallelepiped; the size of the horizontally-arranged anodes (1-7) is determined according to the size of the land of the soil to be treated and the depth experiment of soil pollution; the shape of the horizontal cathode (1-8) is cylindrical or cuboid; the size of the horizontal cathodes (1-8) is determined according to the size of the plot of the soil to be treated and the depth experiment of soil pollution; the strong washing liquid percolator (1-10) is made of a PV plastic pipe or a stainless steel pipe, and the diameter of the strong washing liquid percolator is 20-50 mm; the strong washing liquid collector (1-11) is made of a PV plastic tube or a stainless steel tube, and the diameter of the strong washing liquid collector is 50-100 mm.
5. The in-situ thermal insulation repair system for the polluted site as claimed in claim 1, wherein the strong washing liquid in the strong washing liquid storage tank (2-3) is dipotassium hydrogen phosphate solution; the biological filler (2-7) is mainly a spherical biological filter material, and the spherical biological filter material is one or more of a modified fiber ball filter material, a spherical ceramic material, biological shale ceramsite, a medical stone filter material and a volcanic stone filter material; the ion exchange filter materials (2-8) adopt different ion exchange resins according to the types of heavy metals.
6. The in-situ heat-preservation repair system for the polluted site as claimed in claim 1, wherein the middle of the gas washing tank (3) is cylindrical, the upper end of the gas washing tank is conical, the tank body is provided with an observation port and an overhaul and replacement port, and the volume of the tank body can be determined according to the amount of gas to be treated and is vertically placed; the alkaline washing device is matched with a cylindrical tank body of the washing gas tank (3), the cross section of the alkaline washing liquid storage tank (3-12) is circular, an alkaline washing liquid gathering device (3-14) is arranged above the alkaline washing liquid storage tank (3-12), the diameter of the lower end of the alkaline washing liquid gathering device (3-14) is smaller than the diameter of the uppermost part of the alkaline washing liquid storage tank (3-12), and the alkaline washing liquid gathering device (3-14) can enable alkaline washing liquid to gather and flow back to the alkaline washing liquid storage tank (3-12).
7. The in-situ heat-preservation repair system for the polluted site as claimed in claim 1, wherein the alkaline washing component is further provided with an alkaline washing liquid adding and discharging device (3-15), the alkaline washing liquid adding and discharging device (3-15) comprises an alkaline washing liquid tank and a stirring device, and the alkaline washing liquid adding and discharging device (3-15) is communicated with an alkaline washing liquid circulating pump (3-13) through a pipeline and a valve; further, the alkali wash liquid spraying device (3-11) is a spiral spraying device.
8. The contaminated site heat-preservation in-situ remediation system of claim 1, wherein the caustic wash adopted by the caustic wash component is a sodium hydroxide solution; the proportioning concentration of the alkaline washing liquid is determined according to the gas amount to be treated and the gas concentration experiment; the ultraviolet lamp tube is a high-intensity and high-ozone ultraviolet lamp tube.
9. The in-situ thermal insulation repair system for the polluted site as claimed in claim 1, wherein the troughs of the demisting devices (3-5) are provided with uniformly distributed drainage channels (3-16); after the liquid drops are gathered, the liquid drops flow downwards step by step through the drainage grooves (3-16) and finally flow into the water collecting bins (3-17), and the liquid is collected and treated uniformly through the water collecting bins (3-17), so that the liquid is prevented from flowing to the side surface, and other equipment is prevented from being influenced.
10. The method for site remediation by using the contaminated site heat-preservation in-situ remediation system of any one of claims 1 to 9, characterized by comprising the steps of:
cutting rectangular grooves on a soil block to be restored, wherein the size, shape and depth of each rectangular groove are matched with those of a heat-preservation electric strong washing box (1), a plurality of parallel grooves are cut in a rectangle surrounded by the rectangular grooves, partition plates (1-3) are arranged in the rectangular grooves, box body frameworks (1-1), box bodies (1-2) and heat-preservation roller shutters (1-4) are arranged at the upper parts of the partition plates (1-3), strong washing liquid collectors (1-11) are arranged at the bottoms of the parallel grooves, and horizontal cathodes (1-8) are arranged at the upper parts of the strong washing liquid collectors (1-11);
secondly, arranging a plurality of horizontal anodes (1-7) on the upper part of the polluted soil, wherein the horizontal anodes (1-7) and the horizontal cathodes (1-8) are parallel in space; a strong washing liquid percolator (1-10) is arranged at the upper part of the horizontally arranged anode (1-7); the electric heating plunger is uniformly and vertically inserted into the polluted soil;
filling the plant culture layer (1-5), and selecting plants with super-enrichment capacity to heavy metals from the plant culture layer (1-5);
the strong washing liquid percolator (1-10) seeps out the strong washing liquid, heavy metal ions in the soil migrate to the horizontal cathode (1-8) under the action of electric field force, the strong washing liquid flows to the strong washing liquid collector (1-11) under the action of gravity, the leaching effect is generated on the polluted soil, and the heavy metal ions in the soil are transferred to the strong washing liquid;
fifthly, the strong washing liquid in the strong washing liquid collector (1-11) enters the strong washing liquid ion exchange filter tower (2-2) through a water inlet pipe (2-5) of the strong washing liquid ion exchange filter tower (2-2) and a water distributor (2-6) of the strong washing liquid ion exchange filter tower (2-2) under the action of a strong washing liquid pre-pump (2-1), the strong washing liquid flows through the biological filler (2-7), an aerobic environment is formed on the surface of the biological filler (2-7), an anaerobic environment is formed inside the biological filler (2-7) so as to remove ammonia nitrogen and total nitrogen in water, the ion exchange filter material (2-8) and the strong washing liquid perform exchange reaction, heavy metal ions are exchanged into the ion exchange filter material (2-8), and the strong washing liquid is filtered by the ion exchange filter material (2-8), the strong washing liquid treated by the strong washing liquid ion exchange filter tower (2-2) enters a strong washing liquid storage tank (2-3);
sixthly, adding or discharging the strong washing liquid by the strong washing liquid adding and reducing device (2-13) according to the height of the liquid level of the strong washing liquid, and enabling the strong washing liquid in the strong washing liquid storage tank (2-3) to enter a strong washing liquid percolator (1-10) under the action of a post pump (2-4) of the strong washing liquid for recycling;
seventhly, the ion exchange filter materials (2-8) need to be replaced and regenerated after being saturated;
heating the soil by using the electric heating rod, and volatilizing organic matters in the soil to escape from the soil to form waste gas;
ninthly, the waste gas firstly enters a photocatalytic oxidation area (3-3) of the gas washing tank (3) through the gas collecting pipe (1-6) and the fan, the ultraviolet lamp tube with high intensity and high ozone emits high-energy ultraviolet light beams and ozone to irradiate the waste gas, the waste gas is subjected to synergistic decomposition under the action of the catalytic device (3-10), and pollutants in the waste gas are decomposed into micromolecular substances; the gas continuously rises to contact with the alkaline washing liquid sprayed by the alkaline washing liquid spraying device (3-11), pollutants in the gas and the alkaline washing liquid are subjected to chemical reaction, and reaction products flow into the lower alkaline washing liquid storage tank (3-12) along with the alkaline washing liquid; the gas then enters a demisting device (3-5) where liquid droplets in the gas are intercepted; then the gas enters an active carbon adsorption layer (3-6), substances and liquid drops mixed in the gas are intercepted and adsorbed, and the waste gas is treated into clean gas so as to achieve standard emission.
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| CN113770167A (en) * | 2021-10-09 | 2021-12-10 | 常州大学 | Soil remediation integrated device |
| CN115055502A (en) * | 2022-06-09 | 2022-09-16 | 浙江大学衢州研究院 | Device and method for restoring organic matter contaminated soil through enhanced leaching by direct current-alternating current coupling electric field |
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| CN115055502A (en) * | 2022-06-09 | 2022-09-16 | 浙江大学衢州研究院 | Device and method for restoring organic matter contaminated soil through enhanced leaching by direct current-alternating current coupling electric field |
| CN115055502B (en) * | 2022-06-09 | 2024-03-19 | 浙江大学衢州研究院 | Device and method for restoring organic matter polluted soil by direct current-alternating current coupling electric field enhanced leaching |
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