CN110711769A - Grading heavy metal soil in-situ remediation agent and remediation method thereof - Google Patents
Grading heavy metal soil in-situ remediation agent and remediation method thereof Download PDFInfo
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Abstract
The invention discloses a graded heavy metal soil in-situ remediation agent and a remediation method thereof, belonging to the technical field of environmental protection, and being capable of realizing that magnet powder with different grain diameters is loaded with magnetic heavy metal pollution remediation substances, and the more the remediation substances with stronger adsorption capacity are loaded, the larger the grain diameter is, the pollution degree which is just matched with the heavy metal polluted soil is inversely proportional to the depth, the surface soil pollution degree is deep, the deep soil pollution degree is shallow, and according to the characteristic that the deep hole of the soil is smaller and is difficult to permeate, a novel segmented remediation bamboo is introduced to realize layered stay type in-situ remediation, the remediation of the polluted soil is realized by adsorbing and transferring heavy metals, meanwhile, the recovery of the remediation agent is realized by the magnetic attraction generated by the layered remediation bamboo after the remediation is finished, the transfer of the heavy metals from the soil to the remediation agent is finished, the remediation efficiency is high, and the effect, and saves a large amount of repairing agent.
Description
Technical Field
The invention relates to the technical field of environmental protection, in particular to a graded heavy metal soil in-situ remediation agent and a remediation method thereof.
Background
Soil heavy metal contamination is one of the major environmental hazards worldwide and may enter the human food chain through agricultural crops. Unlike the pollution of other organic compounds, heavy metal pollution is difficult to naturally degrade. Many organic compounds can reduce or eliminate the toxic and harmful effects through physical, chemical or biological purification of nature itself. However, heavy metals have enrichment property, and heavy metals such as lead, cadmium and the like enter the soil environment and accumulate for a long time to destroy the self-cleaning capability of the soil, so that the soil becomes a 'storage bank' of pollutants. When crops are planted on the land, heavy metals can be absorbed by plant roots, so that the yield of the crops is reduced or heavy metals, namely toxic grains and toxic vegetables, are produced. The heavy metal polluted cultivated land area of China is about 1.8 hundred million acres, and most of the heavy metal polluted cultivated land area is concentrated in southern areas. The polluted areas are mainly agricultural areas, sewage irrigation areas, suburban areas of large and medium cities around industrial enterprises, two sides of a traffic main road and the periphery of facility agricultural bases. In the aspects of prevention, control and restoration of heavy metal pollution of farmland soil, the current domestic demand is strong, but the prior art needs optimization and integration demonstration urgently; the complete set of applicable technology is less, the cost is high, the capital investment excessively depends on the government, and the bottleneck for restricting the engineering and industrialization of the farmland soil pollution remediation technology is formed.
Soil heavy metal remediation technologies are mainly divided into phytoremediation, microbial remediation, physicochemical remediation and agricultural engineering remediation technologies. The phytoremediation is to utilize plants and root microorganisms thereof to restore polluted soil, and the phytoremediation can be divided into three categories of plant extraction, plant volatilization and plant stabilization through the absorption and transfer of heavy metals in the soil by super-accumulation plants (such as mustard, chrysanthemum hemicalifornicum and the like); microbial remediation refers to a bioremediation technique that utilizes naturally occurring or artificially cultured functional microorganisms to promote or enhance the metabolism of microorganisms, thereby reducing the activity of toxic pollutants in soil or degrading the toxic pollutants into nontoxic substances. The repairing mechanism of the microorganism mainly comprises biological adsorption, biological conversion and the oxidation reduction, dissolution and methylation of the microorganism on heavy metal ions; the physical and chemical remediation comprises electric remediation, soil leaching and the like, and the electric remediation technology mainly applies a direct current electric field to the two sides of the heavy metal contaminated soil to form an electric field gradient, so that the heavy metal contaminants are brought to the two ends of the electrode, and the purpose of cleaning the contaminated soil is achieved. The soil leaching is to leach the polluted soil by using a leaching solution or a solution containing a reagent capable of improving the solubility of the heavy metal, transfer the heavy metal in the solid phase of the soil to the liquid phase, and then form a relatively stable complex or generate a precipitate by using a compound containing a certain ligand or anions and the heavy metal; the agricultural engineering restoration technology is a method for covering polluted surface soil with uncontaminated active soil or removing the polluted surface soil and then cultivating and activating the lower soil by using a physical mechanical method. The engineering restoration technology mainly comprises soil replacement, soil dressing, deep ploughing and soil turning and the like.
At present, most of the common soil remediation methods in China are remediation agents for in-situ remediation, but the heavy metal contaminated soil has the characteristics that the heavy metal contamination degrees at different depths are inconsistent, this is because the transfer of heavy metal ions is mainly achieved by the penetration of water, and the deeper the soil depth, the greater the density, namely, the pores or cracks are less, and the water permeability is weaker, so that the common repairing agent does not grasp the characteristics of the polluted soil during repairing, the repairing is carried out in a full-coverage non-differentiation mode, on one hand, the repairing is not concentrated enough, the repairing effect is not obvious enough, the time consumption is long, on the other hand, two extreme conditions often occur, the repairing agent stays on the surface layer of the soil and is difficult to deeply repair, on the other hand, the permeation capability is too strong, so that the deep repairing agent is rich, in conclusion, the current heavy metal pollution remediation agent is difficult to truly and effectively remediate soil in a targeted manner.
Disclosure of Invention
1. Technical problem to be solved
Aiming at the problems in the prior art, the invention aims to provide a graded heavy metal soil in-situ repairing agent and a repairing method thereof, which can realize that magnet powder with different grain diameters is loaded with magnetic heavy metal pollution repairing substances, the more the repairing substances with stronger adsorption capacity are loaded, the larger the grain diameter is, the pollution degree of the heavy metal polluted soil is just matched with the inverse proportion of the depth, the surface soil is polluted deeply, the deep soil is polluted shallowly, and according to the characteristic that the deeper hole gap of the soil is smaller and is difficult to permeate, a novel segmented repairing bamboo is introduced to realize layered stay type in-situ repairing, the repairing of the polluted soil is realized by adsorbing and transferring heavy metals, meanwhile, the magnetic attraction generated by the layered repairing bamboo after the repairing is finished realizes the recovery of the repairing agent, and the heavy metals are transferred from the soil to the repairing agent, the repairing efficiency is high, the effect is excellent, and a large amount of repairing agent is saved.
2. Technical scheme
In order to solve the above problems, the present invention adopts the following technical solutions.
The graded heavy metal soil in-situ remediation agent comprises the following components in parts by weight: 15-20 parts of magnet powder with multiple particle sizes, 0.1-1 part of surfactant, 15-20 parts of activated sludge, 10-15 parts of modified attapulgite, 10-15 parts of humic acid, 2-5 parts of chitosan, 3-5 parts of amino acid, 5-10 parts of natural phosphate rock powder, 4-8 parts of polyacrylamide, 20-30 parts of deionized water and 20-40 parts of microbial agent.
Furthermore, the particle size transition range of the magnet powder is 20-100 μm, and the magnet powder is distributed by matching with the porosity of soil, so that the load of remediation substances with different degrees is realized, and the heavy metal pollution remediation of the soil with different depths is performed in a targeted manner.
Further, the activated sludge is subjected to composting by uniformly mixing rice straws, dry branches and fallen leaves, rice field weeds and decomposed pig manure, and is subjected to aerobic fermentation for 10-15 days in an environment with a pH value of 5-6 and a temperature of 30-35 ℃ to obtain the activated sludge, so that organic matters are provided for soil, pollution caused by straw burning is reduced, the environment-friendly concept of sustainable development is met, physical properties of the soil can be improved by returning the straws to the field, the content of the organic matters in the soil can be improved by crushing the straws and returning the straws to the field, the porosity of the soil is increased, water, fertilizer, gas and heat in the soil are coordinated, a good environment is created for microbial activities of the soil, and the decomposition, softening and soil physicochemical properties of the.
Further, the modified attapulgite is prepared by grinding the attapulgite into powder which is sieved by a 1000-mesh sieve, mixing the powder with magnetic fluid, heating to 250-300 ℃ for drying, and naturally cooling after heat preservation for 10-12h, wherein the attapulgite can play a role in passivating heavy metals as an inorganic passivator, has rich large pore structure with specific surface area and excellent adsorption performance, is mixed with the magnetic fluid after grinding and screening, has magnetism after drying, and can be adsorbed by the magnet powder to finish the loading of repairing substances.
Furthermore, the microbial agent is a composite microbial agent which comprises a bacillus amyloliquefaciens microbial agent, a trichoderma microbial agent, a bacillus subtilis microbial agent, a rhodopseudomonas palustris microbial agent, an acinetobacter calcoaceticus microbial agent and a lactococcus lactis microbial agent with the same proportion, the number of effective viable bacteria is not less than 110 CFU/g, most organic pollutants in the soil can be degraded and converted by microorganisms, the toxicity of the organic pollutants is reduced or the organic pollutants are completely harmless, various heavy metal ions in the environment can be passivated, the activity of the heavy metal ions in the soil is reduced by combining the heavy metal ions through the cell surface charge adsorption effect, the complexation effect of secretory metabolites, the chemical precipitation effect and the like of the microorganisms, the direct absorption state content of plant root systems is reduced, the absorption, utilization and enrichment of the plants to the heavy metal ions in the soil are reduced, and the passivation of the heavy metal ions in the, the migration, transformation and utilization of heavy metals in the soil to plants are blocked, the safe planting of the heavy metal polluted cultivated land is realized, and simultaneously the soil nutrient is activated to balance the soil fertility.
A method for repairing graded heavy metal soil in-situ remediation agent comprises the following steps:
s1, preparation of a repairing agent: mixing humic acid, chitosan, amino acid, natural phosphate rock powder, polyacrylamide and deionized water, performing ultrasonic dispersion to prepare a suspension, heating to 60-80 ℃, mechanically stirring for 1.5h, cooling, adding activated sludge, uniformly stirring, adding modified attapulgite, uniformly mixing, finally mixing with a microbial agent, and uniformly stirring;
s2, grading: adding magnet powder with multiple particle sizes and a surfactant into deionized water, performing ultrasonic dispersion for 30min, recovering through magnet adsorption after the ultrasonic dispersion is finished, washing for more than three times with the deionized water, mixing with the product obtained in the step S1, drying at high temperature, keeping the temperature, performing high-frequency mechanical vibration until the mixture is split and crushed into graded powder, splashing a small amount of deionized water to wet the powder after the completion, and forcing the powder to pass through a 200-mesh sieve, a 300-mesh sieve and a 400-mesh sieve sequentially through nitrogen pressurization to obtain a repairing agent;
s3, pre-burying and repairing: pre-burying a segmented repairing bamboo in the heavy metal polluted soil to be repaired every 10m2, mixing the repairing agent obtained in the step S2 with distilled water according to the proportion of 1:10, and applying the repairing agent into the soil through the segmented repairing bamboo;
s4, recovering and planting: and after the restoration is finished, the restoration agent applied in the soil is recovered through the segmental restoration bamboos, the segmental restoration bamboos are pulled out for recovery, and heavy metal enriched plants are directly planted in the left holes after the recovery is finished.
Further, the bamboo is restoreed to the subsection includes the restoration section, both ends difference fixedly connected with depthkeeping section and the section of breaking ground about the restoration section, and integrated into one piece between restoration section, depthkeeping section and the section of breaking ground, depthkeeping section upper end fixedly connected with loading hopper, the restoration section includes a plurality of layering bamboo joints, conveniently buries the subsection restoration bamboo of appointed degree of depth underground in soil, and the restoration section plays the prosthetic effect of subsection, and the depthkeeping section plays the marking effect on the one hand, and on the other hand can prevent that the restoration section from appearing sinking phenomenon, guarantees the prosthetic stability of subsection, and the loading hopper is used for technical staff to apply the repairing agent, and the section of breaking ground plays the effect of breaking ground.
Further, layering bamboo joint upper end fixedly connected with layering screen cloth, layering screen cloth lower extreme fixedly connected with waterproof pipe, the electro-magnet is installed to waterproof intraductal, two sections stainless steel pipes of layering bamboo joint and release pipe, and release pipe fixed connection keep concentric between two sections stainless steel pipes, the release pipe adopts the pellicle to enclose, many evenly distributed's of release pipe outer end fixedly connected with magnetism stretch yarn can realize the depthkeeping release of the prosthetic agent of different particle diameters, and magnetism stretch yarn plays the water conservancy diversion and restores and break open the effect of soil, makes things convenient for the prosthetic agent to flow out fast and permeate into soil on every side.
Furthermore, the using amount of the repairing agent applied to each segmented repairing bamboo in the step S3 is 0.3-0.5kg, so that the soil can be quickly and effectively repaired with less using amount, and the repairing cost is saved.
Furthermore, the heavy metal-enriched plant comprises any one or more of amaranth, semicamomile, Indian mustard, ciliate desert-grass and sedum alfredii hance, can excessively absorb heavy metals and transport the heavy metals to the overground part for accumulation, is ecological and pollution-free, and is suitable for post-treatment of heavy metal contaminated soil.
3. Advantageous effects
Compared with the prior art, the invention has the advantages that:
this scheme can realize adopting the magnet powder load carrier of different particle diameters to have magnetism heavy metal pollution repair material, and the stronger prosthetic materials of load of adsorption capacity just more just also more, its particle diameter just also is big, just in time match the degree of pollution of heavy metal contaminated soil and be the inverse ratio along with the degree of depth, top soil pollution degree is dark, deep soil pollution degree is shallow, and according to the characteristic that the deep hole gap is less to be difficult to the infiltration more in soil, the novel segmentation of introduction is restoreed the bamboo and is realized the normal position restoration of layering dwell formula, realize the restoration to contaminated soil through adsorbing the heavy metal transfer, the while is restoreed the recovery that the magnetic attraction that the bamboo produced through the layering after the restoration was accomplished and is realized the restoration agent, accomplish the transfer of heavy metal from soil to restoration agent, the repair efficiency is high, the effect is remarkable.
Drawings
FIG. 1 is a schematic structural view of a repairing agent of the present invention;
FIG. 2 is a table of the component formulations of the remediation agent of the present invention;
FIG. 3 is a cross-sectional view of a healing agent of the present invention;
FIG. 4 is a schematic structural view of a segmented repair bamboo according to the present invention;
FIG. 5 is a cross-sectional view of the layered bamboo joint of the present invention.
The reference numbers in the figures illustrate:
1 repair section, 11 layering bamboo joint, 12 release pipes, 2 depthkeeping sections, 3 loading hoppers, 4 ground breaking sections, 5 magnetic stretch yarns, 6 layering screen meshes, 7 waterproof pipes and 8 electromagnets.
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. 1-2, an in-situ remediation agent for graded heavy metal soil and a remediation method thereof comprise the following components in parts by weight: 15 parts of multi-particle-size magnet powder, 0.1 part of surfactant, 15 parts of activated sludge, 10 parts of modified attapulgite, 10 parts of humic acid, 2 parts of chitosan, 3 parts of amino acid, 5 parts of natural phosphate rock powder, 4 parts of polyacrylamide, 20 parts of deionized water and 20 parts of microbial agent.
The transition range of the particle size of the magnet powder is 20-100 mu m, the magnet powder is distributed by matching with the porosity of soil, the load of repair substances with different degrees is realized, and the heavy metal pollution repair of the soil with different depths is pertinently carried out.
The activated sludge is subjected to composting by uniformly mixing rice straws, dry branches and fallen leaves, paddy field weeds and decomposed pig manure, and is subjected to aerobic fermentation for 10-15 days in the environment with the pH value of 5-6 and the temperature of 30-35 ℃, so that the activated sludge is obtained, on one hand, organic matters are provided for soil, on the other hand, pollution caused by straw burning is reduced, the environment-friendly concept of sustainable development is met, the physical properties of the soil can be improved by returning the straws to the field, the organic matter content of the soil can be improved by crushing the straws to return the field, the porosity of the soil is increased, the water, fertilizer and gas heat in the soil are coordinated, a good environment is created for the microbial activity of the soil, and the.
The modified attapulgite is prepared by grinding the attapulgite into powder passing through a 1000-mesh sieve, mixing the powder with magnetic fluid, heating to 300 ℃ for drying, and naturally cooling after heat preservation for 10-12h to obtain the modified attapulgite, wherein the magnetic fluid is also called magnetic liquid, ferrofluid or magnetic liquid, is a novel functional material, has the liquidity of liquid and the magnetism of solid magnetic material, is stable colloidal liquid formed by mixing magnetic solid particles with the diameter of nanometer magnitude (below 10 nanometers), base carrier liquid (also called as media) and an interfacial active agent, has no magnetic attraction in a static state, shows the magnetism when an external magnetic field acts, can play a role in passivating heavy metals as an inorganic passivator, and has rich large pore structure with excellent adsorption performance on the specific surface area, after being ground and screened, the magnetic powder is mixed with the magnetic fluid, and the magnetic powder has magnetism after being dried, and can be adsorbed by the magnet powder to finish the loading of the repairing substance.
The microbial agent is a composite microbial agent which comprises a bacillus amyloliquefaciens microbial agent, a trichoderma microbial agent, a bacillus subtilis microbial agent, a rhodopseudomonas palustris microbial agent, a calcium acetate acinetobacter microbial agent and a lactic acid lactobacillus microbial agent in the same proportion, the number of effective viable bacteria is not less than 110 CFU/g, most organic pollutants in the soil can be degraded and converted by microorganisms, the toxicity of the organic pollutants is reduced or the organic pollutants are completely harmless, various heavy metal ions in the environment can be passivated, the activity of the heavy metal ions in the soil is reduced by combining the heavy metal ions through the cell surface charge adsorption effect, the complexation effect of secretory metabolites, the chemical precipitation effect and the like of the microorganisms, the content of the heavy metal ions which can be directly absorbed by a plant root system is reduced, the absorption, utilization and enrichment of the heavy metal in the soil are reduced, the heavy metal ions in the soil are passivated, the heavy metal, And the safe planting of the heavy metal polluted farmland is realized by transformation and utilization, and meanwhile, the soil nutrient is activated to balance the soil fertility.
A method for repairing graded heavy metal soil in-situ remediation agent comprises the following steps:
s1, preparation of a repairing agent: mixing humic acid, chitosan, amino acid, natural phosphate rock powder, polyacrylamide and deionized water, performing ultrasonic dispersion to prepare a suspension, heating to 60-80 ℃, mechanically stirring for 1.5h, cooling, adding activated sludge, uniformly stirring, adding modified attapulgite, uniformly mixing, finally mixing with a microbial agent, and uniformly stirring;
s2, grading: adding magnet powder with multiple particle sizes and a surfactant into deionized water, performing ultrasonic dispersion for 30min, recovering through magnet adsorption after the ultrasonic dispersion is finished, washing for more than three times with the deionized water, mixing with the product obtained in the step S1, drying at high temperature, keeping the temperature, performing high-frequency mechanical vibration until the mixture is split and crushed into graded powder, splashing a small amount of deionized water to wet the powder after the completion, and forcing the powder to pass through a 200-mesh sieve, a 300-mesh sieve and a 400-mesh sieve sequentially through nitrogen pressurization to obtain a repairing agent;
s3, pre-burying and repairing: pre-burying a segmented repairing bamboo in the heavy metal polluted soil to be repaired every 10m2, mixing the repairing agent obtained in the step S2 with distilled water according to the proportion of 1:10, and applying the repairing agent into the soil through the segmented repairing bamboo;
s4, recovering and planting: and after the restoration is finished, the restoration agent applied in the soil is recovered through the segmental restoration bamboos, the segmental restoration bamboos are pulled out for recovery, and heavy metal enriched plants are directly planted in the left holes after the recovery is finished.
Referring to fig. 4-5, the segmental repair bamboo comprises a repair section 1, wherein the upper end and the lower end of the repair section 1 are fixedly connected with a fixed depth section 2 and a soil breaking section 4 respectively, the repair section 1, the fixed depth section 2 and the soil breaking section 4 are integrally formed, the repair section 1 and the fixed depth section 2 are of a hollow structure, the soil breaking section 4 is of a solid structure, the upper end of the fixed depth section 2 is fixedly connected with a feeding hopper 3, the repair section 1 comprises a plurality of layered bamboo joints 11, the segmental repair bamboo with a specified depth can be conveniently buried in soil, the repair section 1 plays a role of segmental repair, the fixed depth section 2 plays a marking role on one hand and can prevent the repair section 1 from sinking on the other hand, the stability of segmental repair is ensured, the feeding hopper 3 is used for technicians to apply a repairing agent, the soil breaking section 4 plays a role, the upper end of the layered bamboo joints 11 is fixedly connected with a layered screen 6, and the meshes of the layered screen 6 are smaller downwards, and is matched with the step S2 grading treatment, the lower end of the layering screen 6 is fixedly connected with a waterproof pipe 7, the inner end of the waterproof pipe 7 is provided with an electromagnet 8, two sections of stainless steel pipes and a release pipe 12 of the layering bamboo joint 11 are fixedly connected between the two sections of stainless steel pipes and keep concentric, the release pipe 12 is enclosed by a semipermeable membrane, the outer end of the release pipe 12 is fixedly connected with a plurality of uniformly distributed magnetic elastic wires 5, the fixed-depth release of the repairing agents with different particle sizes can be realized, and the magnetic elastic wires 5 play a role in diversion repairing and soil breaking, so that the repairing agents can rapidly flow out and permeate into the surrounding soil.
In the step S3, the dosage of the repairing agent applied to each segmental repairing bamboo is 0.3-0.5kg, so that the soil can be quickly and effectively repaired with less dosage, and the repairing cost is saved.
The heavy metal-enriched plant comprises any one or more of amaranth, semicamomile, Indian mustard, ciliate desert-grass and sedum alfredii hance, can absorb heavy metals in excess and transport the heavy metals to the overground part for accumulation, is ecological and pollution-free, and is suitable for post-treatment of heavy metal contaminated soil.
The repairing material has magnetism under the action of the modified attapulgite and is adsorbed and loaded by the magnet powder with different particle sizes, the repairing material is crushed into different particle sizes under the action of different magnetic attraction forces of the magnet powder to form a graded repairing agent, please refer to fig. 3, the repairing material and water after being mixed are added into a charging hopper 3 by adsorbing and transferring heavy metals in soil during repairing, under the screening action of a layered screen 6, the repairing agent with different particle sizes reaches different layered bamboo joints 11, after standing for 1-2h, an electromagnet 8 is started to apply a magnetic field, on one hand, the adsorbing repairing agent cannot be released, on the other hand, a magnetic stretch into soil under the action of the magnetic field to form gaps, after the electromagnet 8 is closed, the water in each layered bamboo joint 11 is released outwards along the gaps from a release pipe 12 along with the repairing agent, and has a slow release effect, realize that the remediation agent of different particle sizes carries out the heavy metal restoration in the soil of the different degree of depth, the big remediation agent of particle size stops on the soil top layer and is difficult to the infiltration downwards, realize the restoration of surface layer pollution, and because the surface layer pollutes comparatively seriously, the prosthetic material of the big remediation agent ability load of particle size is also more, repair effect is good, restart electro-magnet 8 after the restoration is accomplished, it is current technology to be worth noting that the magnetic field control of electro-magnet 8 is, no longer repeated here, to quantity, structure and function do not restrict, the remediation agent of adsorbing with heavy metal gets back to the segmentation again and restores the bamboo and is retrieved the soil of transferring out under the effect of magnetic attraction.
Example 2:
referring to fig. 1-2, an in-situ remediation agent for graded heavy metal soil and a remediation method thereof comprise the following components in parts by weight: 18 parts of multi-particle-size magnet powder, 0.5 part of surfactant, 18 parts of activated sludge, 12 parts of modified attapulgite, 12 parts of humic acid, 3 parts of chitosan, 4 parts of amino acid, 8 parts of natural phosphate rock powder, 6 parts of polyacrylamide, 25 parts of deionized water and 30 parts of microbial agent.
The remainder was in accordance with example 1.
Example 3:
referring to fig. 1-2, an in-situ remediation agent for graded heavy metal soil and a remediation method thereof comprise the following components in parts by weight: 20 parts of multi-particle-size magnet powder, 1 part of surfactant, 20 parts of activated sludge, 15 parts of modified attapulgite, 15 parts of humic acid, 5 parts of chitosan, 5 parts of amino acid, 10 parts of natural phosphate rock powder, 8 parts of polyacrylamide, 30 parts of deionized water and 40 parts of microbial agent.
The remainder was in accordance with example 1.
The invention can realize that the magnet powder with different grain diameters is loaded with magnetic heavy metal pollution repairing substances, the more the adsorbing capacity is, the more the loaded repairing substances are, the larger the grain diameter is, the pollution degree just matched with the heavy metal polluted soil is inversely proportional to the depth, the surface soil pollution degree is deep, the deep soil pollution degree is shallow, and according to the characteristic that the deep hole gap of the soil is smaller and difficult to permeate, the novel segmented repairing bamboo is introduced to realize the layered stay type in-situ repairing, the repairing of the polluted soil is realized by adsorbing and transferring the heavy metal, meanwhile, the magnetic attraction generated by the layered repairing bamboo after the repairing is finished realizes the recovery of the repairing agent, the transfer of the heavy metal from the soil to the repairing agent is finished, the repairing efficiency is high, the effect is excellent, and the using amount of a large amount of the repairing agent is.
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 (10)
1. The graded heavy metal soil in-situ remediation agent is characterized by comprising the following components in parts by weight: the paint comprises the following components in parts by weight: 15-20 parts of magnet powder with multiple particle sizes, 0.1-1 part of surfactant, 15-20 parts of activated sludge, 10-15 parts of modified attapulgite, 10-15 parts of humic acid, 2-5 parts of chitosan, 3-5 parts of amino acid, 5-10 parts of natural phosphate rock powder, 4-8 parts of polyacrylamide, 20-30 parts of deionized water and 20-40 parts of microbial agent.
2. The in-situ remediation agent for graded heavy metal soil of claim 1, wherein: the transition range of the particle size of the magnet powder is 20-100 μm.
3. The in-situ remediation agent for graded heavy metal soil of claim 1, wherein: the activated sludge is prepared by uniformly mixing rice straws, dry branches and fallen leaves, paddy field weeds and decomposed pig manure for composting, and performing aerobic fermentation for 10-15 days in an environment with a pH value of 5-6 and a temperature of 30-35 ℃.
4. The in-situ remediation agent for graded heavy metal soil of claim 1, wherein: the modified attapulgite is prepared by grinding attapulgite into powder passing through a 1000-mesh sieve, mixing with magnetic fluid, heating to 250-300 ℃ for drying, and naturally cooling after heat preservation for 10-12 h.
5. The in-situ remediation agent for graded heavy metal soil of claim 1, wherein: the microbial agent is a composite microbial agent, the composite microbial agent comprises a bacillus amyloliquefaciens microbial agent, a trichoderma microbial agent, a bacillus subtilis microbial agent, a rhodopseudomonas palustris microbial agent, an acinetobacter calcoaceticus microbial agent and a lactococcus lactis microbial agent which are in the same proportion, and the effective viable count is not less than 110 CFU/g.
6. The method for repairing graded heavy metal soil in-situ remediation agent according to any one of claims 1 to 5, wherein the soil remediation agent comprises: the method comprises the following steps:
s1, preparation of a repairing agent: mixing humic acid, chitosan, amino acid, natural phosphate rock powder, polyacrylamide and deionized water, performing ultrasonic dispersion to prepare a suspension, heating to 60-80 ℃, mechanically stirring for 1.5h, cooling, adding activated sludge, uniformly stirring, adding modified attapulgite, uniformly mixing, finally mixing with a microbial agent, and uniformly stirring;
s2, grading: adding magnet powder with multiple particle sizes and a surfactant into deionized water, performing ultrasonic dispersion for 30min, recovering through magnet adsorption after the ultrasonic dispersion is finished, washing for more than three times with the deionized water, mixing with the product obtained in the step S1, drying at high temperature, keeping the temperature, performing high-frequency mechanical vibration until the mixture is split and crushed into graded powder, splashing a small amount of deionized water to wet the powder after the completion, and forcing the powder to pass through a 200-mesh sieve, a 300-mesh sieve and a 400-mesh sieve sequentially through nitrogen pressurization to obtain a repairing agent;
s3, pre-burying and repairing: pre-burying a segmented repairing bamboo in the heavy metal polluted soil to be repaired every 10m2, mixing the repairing agent obtained in the step S2 with distilled water according to the proportion of 1:10, and applying the repairing agent into the soil through the segmented repairing bamboo;
s4, recovering and planting: and after the restoration is finished, the restoration agent applied in the soil is recovered through the segmental restoration bamboos, the segmental restoration bamboos are pulled out for recovery, and heavy metal enriched plants are directly planted in the left holes after the recovery is finished.
7. The method for repairing graded heavy metal soil in-situ remediation agent according to claim 6, wherein the soil remediation agent comprises: the bamboo is restoreed to merogenesis is including restoreing section (1), both ends difference fixedly connected with depthkeeping section (2) and broken ground section (4) about restoreing section (1), and restore between section (1), depthkeeping section (2) and the broken ground section (4) integrated into one piece, fixedly connected with loading hopper (3) in depthkeeping section (2) upper end, restore section (1) and include a plurality of layering bamboo joint (11).
8. The method for repairing graded heavy metal soil in-situ remediation agent according to claim 7, wherein the soil remediation agent comprises: layering bamboo joint (11) upper end fixedly connected with layering screen cloth (6), layering screen cloth (6) lower extreme fixedly connected with waterproof pipe (7), electromagnet (8) are installed to waterproof pipe (7) inner, layering bamboo joint (11) two sections stainless steel pipes and release pipe (12), and release pipe (12) fixed connection between two sections stainless steel pipes and keep concentric, release pipe (12) adopt the pellicle to enclose, release pipe (12) outer end fixedly connected with many evenly distributed's magnetism stretch yarn (5).
9. The method for repairing graded heavy metal soil in-situ remediation agent according to claim 6, wherein the soil remediation agent comprises: the using amount of the repairing agent applied to each segmented repairing bamboo in the step S3 is 0.3-0.5 kg.
10. The method for repairing graded heavy metal soil in-situ remediation agent according to claim 6, wherein the soil remediation agent comprises: the heavy metal-enriched plant comprises one or more of Amaranthaceae plant, herba Sedi Kalimeridis, Indian mustard, Grateloupia filicina and Sedum alfredii Hance.
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