CN110369481B - Embedded package for multistage remediation of uranium-contaminated soil and use method thereof - Google Patents
Embedded package for multistage remediation of uranium-contaminated soil and use method thereof Download PDFInfo
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- CN110369481B CN110369481B CN201910590142.0A CN201910590142A CN110369481B CN 110369481 B CN110369481 B CN 110369481B CN 201910590142 A CN201910590142 A CN 201910590142A CN 110369481 B CN110369481 B CN 110369481B
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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
- B09C1/10—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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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/40—Soil-conditioning materials or soil-stabilising materials containing mixtures of inorganic and organic compounds
Abstract
The invention discloses a pre-buried bag for multi-stage remediation of uranium-contaminated soil and a use method thereof, belonging to the technical field of remediation of uranium-contaminated soil, the pre-buried bag for multi-stage remediation of uranium-contaminated soil can transfer uranyl ions in soil through a tight water guide net in a soil cleaning and pre-buried mode, on one hand, a large amount of uranyl ions are actively and rapidly gathered in the pre-buried bag to facilitate fixed-point remediation, on the other hand, adsorption and accumulation of the uranyl ions are greatly improved through a special soil remediation agent, aggregation of the uranyl ions is promoted based on nano-porous characteristics and is filled in micropores to avoid pollution diffusion, after active first-stage remediation, the uranyl ions in the uranium-contaminated soil are reduced to a certain value, and then, through natural second-stage remediation, namely heavy metal uranium enrichment plant remediation, soil organic matter content and soil fertility are increased, soil surface layer structure is improved and maintained, and a solid foundation is laid for the direct utilization of the soil after uranium pollution remediation.
Description
Technical Field
The invention relates to the technical field of uranium-polluted soil remediation, in particular to a pre-buried bag for multistage remediation of uranium-polluted soil and a using method thereof.
Background
In recent years, the problem of heavy metal pollution of soil in China is increasingly highlighted, which poses serious threats to ecological environment, food safety and human health and cannot be ignored. Waste gas, waste water and waste residue discharged by industries such as dye, chemical industry, leather making, mineral exploitation, smelting and processing contain a large amount of heavy metals, and enter soil in modes such as irrigation (particularly sewage irrigation), solid waste (sludge, garbage and the like) accumulation and atmospheric sedimentation, so that the content of the heavy metals in the soil is increased, particularly the heavy metals in exchangeable states are directly absorbed and enriched by crops, and the human health is directly threatened. Heavy metal soil pollution is the most difficult to solve compared with atmospheric pollution and water pollution. This is because the soil pollution is not easy to diffuse or dilute like the air pollution or the water pollution, once heavy metals enter the soil, the heavy metals are difficult to degrade, and the soil polluted by heavy metals has little use value, so the treatment of the heavy metal soil pollution is not slow.
The development of nuclear industry, the wide application of nuclear technology and other activities in the fields of industry, agriculture, energy, military, traffic, medical treatment and health and the like lead the basic value of radioactive nuclides in the ecological environment around human beings to be continuously increased, the radioactive nuclides entering the environment can migrate in the atmosphere, water and soil and enter human bodies and animal bodies along with food chains to generate radiation damage, and part of the nuclides can influence the physiological and biochemical reactions and metabolic processes of human bodies. Uranium is an important radionuclide, has chemical pollution toxicity and radioactivity, mostly exists in the form of uranyl ions (UO 22 +) in water and soil, and can be used for mining operation and nuclear power generation
The uranium in the soil and the groundwater is polluted by releasing the uranium into the soil, sediment and the groundwater in the modes of tests, nuclear fuels, nuclear weapons, accidental leakage and the like, and the environment on which human beings live is endangered.
The bioremediation method developed in recent years has the characteristics of low cost, high efficiency, low cost, safety, environmental protection and the like, and becomes a research hotspot of the uranium-polluted soil remediation technology, so that a large number of students are attracted to conduct a large amount of research, and a lot of favorable research results are obtained, such as a phytoremediation method or a mode of paving a remediation layer in uranium-polluted soil, but the phytoremediation method has great limitations.
Disclosure of Invention
1. Technical problem to be solved
Aiming at the problems in the prior art, the invention aims to provide a pre-buried bag for multi-stage remediation of uranium-contaminated soil and a using method thereof, which can transfer uranyl ions in the soil through a tight water guide net in a soil cleaning and pre-burying mode, actively and rapidly gather a large amount of uranyl ions into the pre-buried bag to facilitate fixed-point remediation, greatly improve the adsorption and accumulation of the uranyl ions through a special soil remediation agent, improve the agglomeration of the uranyl ions based on the characteristic of nano-porosity and fill the aggregation in micropores to avoid pollution diffusion, after the active primary restoration, the uranyl ions in the uranium-polluted soil are reduced to a certain value, and then the natural secondary restoration is carried out, the method is characterized in that heavy metal uranium enrichment phytoremediation is carried out, the organic matter content and soil fertility of soil are increased, the surface layer structure of the soil is improved and maintained, and a solid foundation is laid for direct utilization of the uranium-polluted and repaired soil.
2. Technical scheme
In order to solve the above problems, the present invention adopts the following technical solutions.
The utility model provides a multistage restoration of uranium contaminated soil is with pre-buried package, pre-buried package is including pre-buried package body, pre-buried package body intussuseption is filled with soil remediation agent, the pre-buried package body upper end is excavated there is the pilot hole, the interior end wall fixedly connected with thread bush of pilot hole, thread bush inner end threaded connection has the thread table, thread table central point puts and opens and chisel there is the connecting hole, fixedly connected with transition ball in the connecting hole, transition ball upper end fixedly connected with warp the pole, warp pole upper end fixedly connected with locating lever, a plurality of water fibre that closes of transition ball upper end fixedly connected with, it distributes along warping pole annular array to close water fibre, a plurality of water fibre of transition ball lower extreme fixedly connected with, it evenly pegs graft in soil remediation agent inner to divide water fibre.
Further, the soil remediation agent comprises, by weight, 30-40 parts of organic silicon microbial fertilizer, 20-30 parts of modified medical stone powder, 5-20 parts of bentonite, 5-10 parts of natural zeolite, 5-10 parts of apatite and 3-15 parts of chelating agent.
Furthermore, the organic silicon microbial fertilizer has the capability of restoring soil acid-base balance, can passivate the biological activity of heavy metal ions, has no pollution to soil and ecology by organic silicon materials, and can improve soil.
Furthermore, after the medical stone is calcined by the modified medical stone powder, initiator potassium persulfate and chitosan are added for stirring reaction, phytic acid is added at room temperature for stirring reaction, and finally the mixture is ground into particles or powder, the chitosan and phytic acid modified medical stone are used as main components of the heavy metal removal, chitosan molecules have functional groups such as hydroxyl, amino and the like, the medical stone is modified by the chitosan, the chitosan molecules are connected on the surfaces of the medical stone molecules under the action of the initiator potassium persulfate, because the surfaces of the chitosan molecules contain a large number of hydrogen bonds, the phytic acid molecules are combined with the chitosan molecules through the hydrogen bonds, the phytic acid molecules are firmly combined on the medical stone molecules, the phytic acid has strong complexing ability on most metal ions, the phytic acid can generate precipitates on divalent metal ions, and the phytic acid molecules are well connected on the medical stone molecules through the chitosan molecules as intermediates, greatly improving the adsorption rate of heavy metals in the soil.
Furthermore, a controller with a power supply is installed at the inner end of the thread table, the controller is connected with a temperature sensor, a heating pipe groove is formed in the inner end of the water diversion fiber, a heating wire is installed in the heating pipe groove, and the heating wire is electrically connected with the controller.
Furthermore, the water-binding fibers, the transition balls and the water-dividing fibers are all made of super water-absorbing materials, the super water-absorbing materials are made of high-molecular water-absorbing resin and water-absorbing fluff fibers which are mixed according to a ratio of 1:1, the water-absorbing fluff fibers are made by spinning after being modified by polyacrylic acid, the particle size of the high-molecular water-absorbing resin is 100-120mesh, the water-absorbing fluff fibers are soft, high in fluffiness, thick and long in fibers, 2.7-3.0mm in length, low in fine fiber content, uniform in mesh fibers and more than 7N in network tension, and the super water-absorbing materials have extremely high water absorption and can actively 'catch' water in soil so as to finish aggregation and adsorption of uranyl ions.
Further, the pole that warp includes columniform electronic gasbag, and electronic gasbag and controller electric connection, electronic gasbag outer end parcel has the enhancement nylon layer, it scribbles corrosion-resistant coating to strengthen the nylon layer surface, and the pole that warp has the changeable flexibility of shape, avoids the phenomenon of rupture to appear at the in-process that soil backfilled, also conveniently transports simultaneously and buries underground, strengthens the nylon layer and plays the effect of protection electronic gasbag, avoids its ruptured condition to take place.
Further, the size of pre-buried package body is 50 x 20cm, four evenly distributed's of pre-buried package body lower extreme fixedly connected with stabilizer bar, a plurality of fin of the equal fixedly connected with in locating lever and stabilizer bar outer end, locating lever, stabilizer bar and fin all adopt stainless steel, conveniently fix the pre-buried package body in soil difficult removal, and then convenient subsequent location is transplanted.
A use method of a pre-buried package for multistage remediation of uranium contaminated soil specifically comprises the following steps:
s1, removing surface soil of 50-60cm uranium-polluted soil, paving one embedded bag per square meter, and forming a soil remediation layer after paving is completed;
s2, hanging a water collecting net 15-20cm above the soil remediation layer, and fixing the water combining fiber and the water collecting net;
s3, starting the electric air bag to inflate to harden, backfilling surface soil and tamping, and exposing the positioning rod to the soil surface by 10-20 cm;
s4, adopting artificial irrigation or natural rainfall mode to the surface soil above the soil restoration layer, restoring for 1-2 years, and completing first-level restoration after the heavy metal content in the soil above the soil restoration layer is reduced to a required value;
s5, removing surface soil, taking down a thread table, and leaving a pre-buried bag body and a soil repairing agent, transplanting heavy metal enriched plants in the pre-buried bag body, backfilling the surface soil, tolerating and excessively accumulating heavy metal uranium by the heavy metal enriched plants, wherein the repairing time is 2-3 years, and secondary repairing is completed;
and S6, when the heavy metal content of the soil on the upper part of the soil remediation layer is reduced to a normal value, recovering the embedded bags and the heavy metal-enriched plants, and completing the recovery of uranium pollutants.
Furthermore, the heavy metal enrichment plant is Indian mustard or sunflower, the net that gathers water adopts super absorbent yarn to weave and forms, super absorbent yarn adopts super absorbent fiber and polyester fiber spinning to form, Indian mustard or sunflower all have extremely strong repair ability to uranium contaminated soil, gather the effect that the net played water in the gathering soil, and super absorbent fiber in the super absorbent yarn has extremely strong water absorption ability, and polyester fiber plays wear-resisting difficult cracked effect.
3. Advantageous effects
Compared with the prior art, the invention has the advantages that:
(1) this scheme can be through the pre-buried mode of clear soil, on the one hand, transfer the uranyl ion in the soil through tight water guide net, with the rapid gathering of a large amount of uranyl ions in the pre-buried package of initiative, be convenient for develop the fixed point and repair, on the other hand improves absorption and the accumulation to the uranyl ion by a wide margin through special soil remediation agent, promote the agglomeration to the uranyl ion and fill and avoid polluting the diffusion in the micropore based on nanometer porous characteristic, repair the back through active one-level, the uranyl ion in the uranium contaminated soil reduces to a definite value, repair through the second grade of natural formula, heavy metal uranium enrichment plant repair promptly, increase soil organic matter content and soil fertility, improve and maintain soil surface layer structure, lay solid foundation for the direct utilization of the soil after the uranium contamination restoration.
(2) The soil repairing agent comprises, by weight, 30-40 parts of organic silicon microbial fertilizer, 20-30 parts of modified medical stone powder, 5-20 parts of bentonite, 5-10 parts of natural zeolite, 5-10 parts of apatite and 3-15 parts of chelating agent. The organic silicon microbial fertilizer has the capability of restoring soil acid-base balance, can passivate the biological activity of heavy metal ions, has no pollution to soil and ecology by organic silicon materials, and can improve soil.
(3) The modified medical stone powder is prepared by calcining medical stone, adding initiator potassium persulfate and chitosan, stirring for reaction, adding phytic acid at room temperature, stirring for reaction, grinding into particles or powder, adopting chitosan and phytic acid modified medical stone as main components for removing heavy metals, modifying the medical stone with chitosan, connecting chitosan molecules on the surface of the medical stone molecules under the action of the initiator potassium persulfate, combining phytic acid molecules with the chitosan molecules through hydrogen bonds, firmly combining the phytic acid molecules on the medical stone molecules, enabling the phytic acid to have strong complexing ability on most metal ions, generating precipitates for divalent metal ions, and connecting the phytic acid molecules on the medical stone molecules through the chitosan molecules as an intermediate, greatly improving the adsorption rate of heavy metals in the soil.
(4) The inner end of the thread table is provided with a controller with a power supply, the controller is connected with a temperature sensor, the inner end of the water distribution fiber is provided with a heating pipe groove, a heating wire is arranged in the heating pipe groove, and the heating wire is electrically connected with the controller.
(5) The water-binding fibers, the transition balls and the water-dividing fibers are all made of super water-absorbing materials, the super water-absorbing materials are made of high-molecular water-absorbing resin and water-absorbing fluff fibers which are mixed according to a ratio of 1:1, the water-absorbing fluff fibers are made by spinning after being modified by polyacrylic acid, the particle size of the high-molecular water-absorbing resin is 100-120mesh, the water-absorbing fluff fibers are soft, high in bulkiness, thick and long in fiber, 2.7-3.0mm in length, low in fine fiber content, uniform in network fiber, and more than 7N in network tension, and the super water-absorbing materials have extremely strong water absorption and can actively capture water in soil so as to complete gathering and adsorption of uranyl ions.
(6) The pole that warp includes columniform electronic gasbag, and electronic gasbag and controller electric connection, and electronic gasbag outer end parcel has the enhancement nylon layer, strengthens the nylon layer surface and scribbles corrosion-resistant coating, and the pole that warp has the changeable flexibility of shape, avoids appearing the phenomenon of rupture at the in-process that soil backfilled, also conveniently transports simultaneously and buries underground, strengthens the nylon layer and plays the effect of protection electronic gasbag, avoids its ruptured condition to take place.
(7) The size of pre-buried package body is 50 x 20cm, and pre-buried package body lower extreme fixedly connected with has four evenly distributed's stabilizer bar, and a plurality of fins of locating lever and the equal fixedly connected with of stabilizer bar outer end, locating lever, stabilizer bar and fin all adopt stainless steel, conveniently fix pre-buried package body in soil difficult removal, and then convenient subsequent location is transplanted.
(8) Heavy metal enrichment plant is Indian mustard or sunflower, gathers water net and adopts super absorbent yarn to weave, and super absorbent yarn adopts super absorbent fiber and polyester fiber spinning to form, and Indian mustard or sunflower all have extremely strong repair ability to uranium contaminated soil, gathers water net and play the effect of gathering moisture in the soil, and super absorbent fiber in the super absorbent yarn has extremely strong water-absorbing capacity, and polyester fiber plays wear-resisting difficult cracked effect.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural diagram of a repair layer formed according to the present invention;
FIG. 3 is a schematic structural view of the present invention in a repair state;
FIG. 4 is a schematic structural view of the water-shed fiber portion of the present invention;
FIG. 5 is a schematic structural diagram of the organic silicon microbial fertilizer in a uranyl ion adsorption state.
The reference numbers in the figures illustrate:
the embedded package comprises a 1 embedded package body, a 2 threaded sleeve, a 3 threaded platform, a 4 deformation rod, a 5 positioning rod, 6 water-binding fibers, a 7 stabilizing rod, an 8 water-collecting net, 9 water-separating fibers, 10 electric heating wires and 11 transition balls.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise specifically stated or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are used in a broad sense, and for example, "connected" may be a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, and a communication between two elements.
Example 1:
referring to fig. 1 and 3, the pre-buried package for multi-stage remediation of uranium contaminated soil comprises a pre-buried package body 1, the pre-buried package body 1 is a semi-permeable membrane and allows water molecules, nutrients and uranyl ions to pass through, a soil remediation agent is filled in the pre-buried package body 1, an assembly hole is drilled in the upper end of the pre-buried package body 1, a thread sleeve 2 is fixedly connected to the end wall in the assembly hole, a thread table 3 is connected to the inner end of the thread sleeve 2 in a threaded manner, the pre-buried package is convenient to install and disassemble, a connecting hole is drilled in the center of the thread table 3, a transition ball 11 is fixedly connected in the connecting hole and plays a role in transferring water, a deformation rod 4 is fixedly connected to the upper end of the transition ball 11, the deformation rod 4 comprises a cylindrical electric air bag, the electric air bag is electrically connected with a controller, a reinforced nylon layer is wrapped on the outer end of the electric air bag, a corrosion-resistant coating is coated on the surface of the reinforced nylon layer, and the deformation rod 4 has flexibility of changeable shape, the phenomenon of breakage in the soil backfilling process is avoided, meanwhile, the transportation and embedding are facilitated, the reinforced nylon layer plays a role in protecting an electric air bag, the breakage of the electric air bag is avoided, the positioning rod 5 is fixedly connected to the upper end of the deformation rod 4 and plays a positioning role, the upper end of the deformation rod corresponds to the embedded package body 1 below the deformation rod, the upper end of the transition ball 11 is fixedly connected with a plurality of water-synthesizing fibers 6, the water-synthesizing fibers 6 are distributed along the deformation rod 4 in an annular array mode, the lower end of the transition ball 11 is fixedly connected with a plurality of water-distributing fibers 9, the water-distributing fibers 9 are uniformly inserted into the inner end of the soil repairing agent and used for uniformly transmitting absorbed water into the soil repairing agent to finish the gathering effect on uranyl ions, the direct repairing of the soil repairing agent is facilitated, the size of the embedded package body 1 is 50cm to 20cm, the lower end of the embedded package body 1 is fixedly connected with four stabilizer bars 7 which are uniformly distributed, locating lever 5 and the equal fixedly connected with a plurality of fins in stabilizer bar 7 outer end, locating lever 5, stabilizer bar 7 and fin all adopt stainless steel, and the convenience is fixed pre-buried package body 1 and is difficult for removing in soil, and then convenient subsequent location is transplanted.
The soil remediation agent comprises, by weight, 30-40 parts of organic silicon microbial fertilizer, 20-30 parts of modified medical stone powder, 5-20 parts of bentonite, 5-10 parts of natural zeolite, 5-10 parts of apatite and 3-15 parts of chelating agent, wherein the organic silicon microbial fertilizer has the capacity of restoring soil acid-base balance, can passivate the biological activity of heavy metal ions, and has no pollution to soil and ecology and can improve soil.
The modified medical stone powder is prepared by calcining medical stone, adding initiator potassium persulfate and chitosan, stirring for reaction, adding phytic acid at room temperature, stirring for reaction, grinding into particles or powder, adopting chitosan and phytic acid modified medical stone as main components for removing heavy metals, modifying the medical stone with chitosan, connecting chitosan molecules on the surface of the medical stone molecules under the action of the initiator potassium persulfate, combining phytic acid molecules with the chitosan molecules through hydrogen bonds, firmly combining the phytic acid molecules on the medical stone molecules, enabling the phytic acid to have strong complexing ability on most metal ions, generating precipitates for divalent metal ions, and connecting the phytic acid molecules on the medical stone molecules through the chitosan molecules as an intermediate, greatly improving the adsorption rate of heavy metals in the soil.
Referring to fig. 3-4, a controller with a power supply is installed at the inner end of the thread table 3, the controller is connected with a temperature sensor, a heating groove is drilled at the inner end of the water diversion fiber 9, a heating wire 10 is installed in the heating groove, and the heating wire 10 is electrically connected with the controller.
The water-binding fibers 6, the transition balls 11 and the water-distributing fibers 9 are all made of super water-absorbing materials, the super water-absorbing materials are made of high-molecular water-absorbing resin and water-absorbing fluff fibers which are mixed according to a ratio of 1:1, the water-absorbing fluff fibers are made by spinning after being modified by polyacrylic acid, the particle size of the high-molecular water-absorbing resin is 100 plus 120mesh, the water-absorbing fluff fibers are soft, high in filling power, thick and long in fibers, 2.7-3.0mm in length, low in fine fiber content, uniform in reticular fibers, and more than 7N in network tension, and the super water-absorbing materials have extremely high water absorption and can actively 'catch' water in soil to complete aggregation and adsorption of uranyl ions.
Referring to fig. 2, a using method of the pre-buried package for multi-stage uranium contaminated soil remediation specifically includes the following steps:
s1, removing surface soil of 50-60cm uranium-polluted soil, paving a pre-buried bag every square meter, and forming a soil remediation layer after paving is completed;
s2, hanging a water collecting net 8 at a position 15-20cm above the soil remediation layer, and fixing the water combining fiber 6 and the water collecting net 8;
s3, starting the electric air bag to inflate to harden, backfilling surface soil and tamping, wherein the positioning rod 5 is exposed out of the soil surface by 10-20 cm;
s4, adopting artificial irrigation or natural rainfall mode to the surface soil above the soil restoration layer, restoring for 1-2 years, and completing first-level restoration after the heavy metal content in the soil above the soil restoration layer is reduced to a required value;
s5, removing surface soil, taking down a thread table 3, and leaving a pre-buried bag body 1 and a soil repairing agent, transplanting heavy metal enriched plants in the pre-buried bag body 1, backfilling the surface soil, tolerating and excessively accumulating heavy metal uranium by the heavy metal enriched plants, completing secondary repairing for 2-3 years, and enabling the plants to interact with heavy metals in the soil through root exudates to passivate toxicity or mobility of the heavy metals, so that diffusion of heavy metal pollution is reduced;
and S6, when the heavy metal content of the soil on the upper part of the soil remediation layer is reduced to a normal value, recovering the pre-buried bags and the heavy metal enriched plants to complete the recovery of uranium pollutants.
Heavy metal enrichment plant is Indian mustard or sunflower, and water accumulation net 8 adopts super absorbent yarn to weave, and super absorbent yarn adopts super absorbent fiber and polyester fiber spinning to form, and Indian mustard or sunflower all have extremely strong repair ability to uranium contaminated soil, and water accumulation net 8 plays the effect of gathering moisture in the soil, and super absorbent fiber in the super absorbent yarn has extremely strong water absorption capacity, and polyester fiber plays wear-resisting difficult cracked effect.
Example 2:
the soil remediation agent comprises 35 parts by weight of organic silicon microbial fertilizer, 25 parts by weight of modified medical stone powder, 10 parts by weight of bentonite, 8 parts by weight of natural zeolite, 8 parts by weight of apatite and 10 parts by weight of chelating agent, the organic silicon microbial fertilizer has the capacity of restoring soil acid-base balance, can passivate the biological activity of heavy metal ions, and the organic silicon material has no pollution to soil and ecology and can improve soil.
The remainder was in accordance with example 1.
Referring to fig. 2, a using method of the pre-buried package for multi-stage uranium contaminated soil remediation specifically includes the following steps:
s1, removing surface soil of 50cm uranium-polluted soil, paving a pre-buried bag every square meter, and forming a soil remediation layer after paving is completed;
s2, hanging a water collecting net 8 at a position 15cm above the soil remediation layer, and fixing the water combining fiber 6 and the water collecting net 8 mutually;
s3, starting the electric air bag to inflate to harden, backfilling surface soil and tamping, and exposing the positioning rod 5 to 15cm of the soil surface;
s4, adopting artificial irrigation or natural rainfall mode to the surface soil above the soil restoration layer, restoring for 1 year, and completing first-stage restoration after the heavy metal content in the soil at the upper part of the soil restoration layer is reduced to a required value;
s5, removing surface soil, taking down a thread table 3, and leaving a pre-buried bag body 1 and a soil repairing agent, transplanting heavy metal enriched plants in the pre-buried bag body 1, backfilling the surface soil, tolerating and excessively accumulating heavy metal uranium by the heavy metal enriched plants, completing secondary repairing for 3 years, and enabling the plants to react with heavy metals in the soil through root exudates to passivate toxicity or mobility of the heavy metals, so that diffusion of heavy metal pollution is reduced;
and S6, when the heavy metal content of the soil on the upper part of the soil remediation layer is reduced to a normal value, recovering the pre-buried bags and the heavy metal enriched plants to complete the recovery of uranium pollutants.
Example 3:
the soil remediation agent comprises 40 parts by weight of organic silicon microbial fertilizer, 30 parts by weight of modified medical stone powder, 20 parts by weight of bentonite, 10 parts by weight of natural zeolite, 10 parts by weight of apatite and 15 parts by weight of chelating agent, the organic silicon microbial fertilizer has the capacity of restoring soil acid-base balance, can passivate the biological activity of heavy metal ions, and the organic silicon material has no pollution to soil and ecology and can improve soil.
Referring to fig. 2, a using method of the pre-buried package for multi-stage uranium contaminated soil remediation specifically includes the following steps:
s1, removing 60cm of surface soil of uranium-polluted soil, paving a pre-buried bag every square meter, and forming a soil remediation layer after paving is completed;
s2, hanging a water collecting net 8 20cm above the soil remediation layer, and fixing the water combining fiber 6 and the water collecting net 8;
s3, starting the electric air bag to inflate to harden, backfilling surface soil and tamping, and exposing the positioning rod 5 to 20cm of the soil surface;
s4, adopting artificial irrigation or natural rainfall mode to the surface soil above the soil restoration layer, restoring for 1 year, and completing first-stage restoration after the heavy metal content in the soil at the upper part of the soil restoration layer is reduced to a required value;
s5, removing surface soil, taking down a thread table 3, and leaving a pre-buried bag body 1 and a soil repairing agent, transplanting heavy metal enriched plants in the pre-buried bag body 1, backfilling the surface soil, tolerating and excessively accumulating heavy metal uranium by the heavy metal enriched plants, completing secondary repairing for 2 years, and enabling the plants to react with heavy metals in the soil through root exudates to passivate toxicity or mobility of the heavy metals, so that diffusion of heavy metal pollution is reduced;
and S6, when the heavy metal content of the soil on the upper part of the soil remediation layer is reduced to a normal value, recovering the pre-buried bags and the heavy metal enriched plants to complete the recovery of uranium pollutants.
The remainder was in accordance with example 1.
According to the method, through a soil cleaning and pre-burying mode, on one hand, uranyl ions in soil are transferred through a tight water guide net, a large number of uranyl ions are actively and rapidly gathered into a pre-buried bag to facilitate fixed-point repair, on the other hand, adsorption and accumulation of the uranyl ions are greatly improved through a special soil repairing agent, aggregation of the uranyl ions is promoted based on the characteristic of nanometer porosity and is filled in micropores to avoid pollution diffusion, after active primary repair is carried out, the uranyl ions in the uranium-polluted soil are reduced to a certain value, then natural secondary repair is carried out, namely heavy metal uranium enrichment plant repair is carried out, soil organic matter content and soil fertility are increased, soil surface layer structure is improved and maintained, and a solid foundation is laid for direct utilization of the soil after uranium pollution repair.
The foregoing is only a preferred embodiment of the present invention; the scope of the invention is not limited thereto. Any person skilled in the art should be able to cover the technical scope of the present invention by equivalent or modified solutions and modifications within the technical scope of the present invention.
Claims (9)
1. The utility model provides a multistage restoration of uranium contaminated soil is with pre-buried package which characterized in that: the embedded bag comprises an embedded bag body (1), the embedded bag body (1) is filled with a soil repairing agent, an assembly hole is drilled at the upper end of the embedded bag body (1), a threaded sleeve (2) is fixedly connected with the inner end wall of the assembly hole, the inner end of the threaded sleeve (2) is connected with a threaded table (3) in a threaded manner, a connecting hole is drilled in the center of the threaded table (3), a transition ball (11) is fixedly connected in the connecting hole, the upper end of the transition ball (11) is fixedly connected with a deformation rod (4), the upper end of the deformation rod (4) is fixedly connected with a positioning rod (5), the upper end of the transition ball (11) is fixedly connected with a plurality of water-binding fibers (6), the hydration fibers (6) are distributed along the deformation rod (4) in an annular array mode, the lower end of the transition ball (11) is fixedly connected with a plurality of water diversion fibers (9), and the water diversion fibers (9) are uniformly inserted into the inner end of the soil remediation agent.
2. The embedded package for multistage uranium contaminated soil remediation according to claim 1, wherein the embedded package comprises: the soil repairing agent comprises, by weight, 30-40 parts of organic silicon microbial fertilizer, 20-30 parts of modified medical stone powder, 5-20 parts of bentonite, 5-10 parts of natural zeolite, 5-10 parts of apatite and 3-15 parts of chelating agent.
3. The embedded package for multistage uranium contaminated soil remediation according to claim 2, wherein the embedded package comprises: the modified medical stone powder is prepared by calcining medical stone, adding an initiator potassium persulfate and chitosan, stirring for reaction, then adding phytic acid at room temperature, stirring for reaction, and finally grinding into particles or powder.
4. The embedded package for multistage uranium contaminated soil remediation according to claim 1, wherein the embedded package comprises: the water distribution fiber heating device is characterized in that a controller with a power supply is installed at the inner end of the thread table (3), the controller is connected with a temperature sensor, a heating pipe groove is formed in the inner end of the water distribution fiber (9), a heating wire (10) is installed in the heating pipe groove, and the heating wire (10) is electrically connected with the controller.
5. The embedded package for multistage uranium contaminated soil remediation according to claim 1, wherein the embedded package comprises: the water-combining fibers (6), the transition balls (11) and the water-dividing fibers (9) are all made of super water-absorbing materials, the super water-absorbing materials are made of high-molecular water-absorbing resin and water-absorbing fluff fibers which are mixed according to the ratio of 1:1, the water-absorbing fluff fibers are made by spinning after being modified by polyacrylic acid, the particle size of the high-molecular water-absorbing resin is 100-120mesh, the water-absorbing fluff fibers are soft, high in bulkiness, thick and long in fibers, 2.7-3.0mm in length, low in fine fiber content, uniform in mesh fibers, and more than 7N in network tension.
6. The embedded package for multistage uranium contaminated soil remediation according to claim 1, wherein the embedded package comprises: the deformation rod (4) comprises a cylindrical electric air bag, the electric air bag is electrically connected with the controller, the outer end of the electric air bag is wrapped with a reinforced nylon layer, and the surface of the reinforced nylon layer is coated with a corrosion-resistant coating.
7. The embedded package for multistage uranium contaminated soil remediation according to claim 1, wherein the embedded package comprises: the size of pre-buried package body (1) is 50 x 20cm, pre-buried package body (1) lower extreme fixedly connected with four evenly distributed stabilizer bars (7), locating lever (5) and stabilizer bar (7) outer end all fixedly connected with a plurality of fins, locating lever (5), stabilizer bar (7) and fin all adopt stainless steel.
8. The use method of the pre-buried package for multi-stage uranium contaminated soil remediation according to any one of claims 1 or 6, wherein the pre-buried package comprises: the using method specifically comprises the following steps:
s1, removing surface soil of 50-60cm uranium-polluted soil, paving one embedded bag per square meter, and forming a soil remediation layer after paving is completed;
s2, hanging a water-collecting net (8) 15-20cm above the soil remediation layer, and fixing the water-combining fiber (6) and the water-collecting net (8) to each other;
s3, starting the electric air bag to inflate to harden, backfilling surface soil and tamping, wherein the positioning rod (5) is exposed out of the soil surface by 10-20 cm;
s4, adopting artificial irrigation or natural rainfall mode to the surface soil above the soil restoration layer, restoring for 1-2 years, and completing first-level restoration after the heavy metal content in the soil above the soil restoration layer is reduced to a required value;
s5, digging soil downwards according to the position of the positioning rod (5), taking down the thread table (3) to leave the embedded bag body (1) and the soil repairing agent, transplanting heavy metal enriched plants in the embedded bag body (1), backfilling surface soil, tolerating and excessively accumulating heavy metal uranium by the heavy metal enriched plants, and completing secondary repairing for 2-3 years;
and S6, when the heavy metal content of the soil on the upper part of the soil remediation layer is reduced to a normal value, recovering the embedded bags and the heavy metal-enriched plants, and completing the recovery of uranium pollutants.
9. The use method of the pre-buried package for multi-stage uranium contaminated soil remediation, according to claim 8, is characterized in that: the heavy metal-enriched plant is Indian mustard or sunflower, the water-collecting net (8) is woven by super water-absorbing yarns, and the super water-absorbing yarns are spun by super water-absorbing fibers and polyester fibers.
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