CN111040771B - Site-contaminated soil ex-situ remediation agent and application method thereof - Google Patents
Site-contaminated soil ex-situ remediation agent and application method thereof Download PDFInfo
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- CN111040771B CN111040771B CN201911246735.1A CN201911246735A CN111040771B CN 111040771 B CN111040771 B CN 111040771B CN 201911246735 A CN201911246735 A CN 201911246735A CN 111040771 B CN111040771 B CN 111040771B
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
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- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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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
- C09K2109/00—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE pH regulation
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Abstract
The invention discloses a site-contaminated soil ex-situ remediation medicament and an application method thereof, relating to the technical field of soil remediation, and the technical scheme is that the site-contaminated soil ex-situ remediation medicament is composed of a stabilizing curing agent and a soil conditioner; the stabilizing curing agent comprises the following components in parts by weight: 40-50 parts of chitosan modified zeolite adsorbent, 20-30 parts of quick lime, 15-20 parts of clay, 5-10 parts of silicon micropowder, 10-15 parts of oxidant and 5-7 parts of metal oxide. The remediation agent can remove organic pollutants in the soil while the heavy metals in the soil lose biological effectiveness, and has an excellent remediation effect.
Description
Technical Field
The invention relates to the technical field of soil remediation, in particular to a site-contaminated soil ex-situ remediation agent and an application method thereof.
Background
The contaminated soil refers to soil in which harmful and toxic substances entering the soil exceed the self-cleaning capacity of the soil, so that physical, chemical and biological substances of the soil are changed to affect human health or ecological environment, and the soil is required to be repaired according to the contaminated soil. Soil remediation refers to a process of fixing, transferring, absorbing, degrading or converting pollutants in field soil to an acceptable level or converting toxic and harmful pollutants into harmless substances by adopting a physical, chemical or biological method; the polluted site restoration technology can be divided into in-situ restoration and ex-situ restoration according to restoration modes, the in-situ restoration is realized by helping a restoration agent in the polluted soil, and the polluted soil can be restored in situ, so that the operation is more convenient, the cost is lower, but the in-situ restoration only has better effect on light and medium polluted soil, and the ex-situ restoration needs to be selected for the restoration of the heavily polluted soil; ectopic remediation refers to a technique of digging polluted soil from a polluted position and treating the polluted soil within an original site range or after transportation.
Soil pollutants can be roughly divided into two categories of inorganic pollutants and organic pollutants, wherein the inorganic pollutants mainly comprise acid, alkali, heavy metal, salt, compounds of radioactive elements cesium and strontium, compounds containing arsenic, selenium and fluorine and the like; the organic pollutants mainly comprise organic pesticides, phenols, cyanides, petroleum, synthetic detergents and the like. Different remediation methods need to be selected according to different pollutants in different polluted soil. In the prior art, a chinese patent with an issued publication number of CN102101123B discloses an in-situ remediation method for heavy metal contaminated soil, which uses a remediation agent prepared from submicron or nanometer iron, fly ash, a magnesium-containing preparation and bentonite, and reduces heavy metals of cadmium, chromium, mercury, lead, arsenic, nickel, zinc, copper, manganese and vanadium in the heavy metal contaminated soil into low-price immobilized heavy metals by using the in-situ remediation method, so that the biological effectiveness of the heavy metals is lost, and the in-situ remediation of the heavy metal contaminated soil is realized. As another example, in the prior art, patent application publication No. CN106694540A discloses a remediation method for soil contaminated by organochlorine pesticide, which uses a remediation agent with chemical reduction performance and slow release of carbon source biomass, and repairs the soil contaminated by organochlorine pesticide by a combination of periodic anaerobic fermentation, chemical reduction dechlorination and aerobic biodegradation.
However, the method is used for repairing a site with a single pollution source, and for chemical and pharmaceutical enterprises, the site of the enterprise mostly contains organic matter and heavy metal composite pollutants, and pollution factors in soil mainly comprise lead, mercury, zinc, dichlorodiphenyl trichloroethane, hexachloro cyclohexane and the like. Obviously, the existing remediation agent cannot well remediate a complex pollution type site.
Disclosure of Invention
One of the purposes of the invention is to provide a site-contaminated soil ex-situ remediation agent, which can remove organic pollutants in soil while losing the biological effectiveness of heavy metals in the soil through the remediation agent, and has an excellent remediation effect.
The technical purpose of the invention is realized by the following technical scheme:
a site contaminated soil ex-situ remediation agent consists of a stabilizing curing agent and a soil conditioner; the stabilizing curing agent comprises the following components in parts by weight: 40-50 parts of chitosan modified zeolite adsorbent, 20-30 parts of quick lime, 15-20 parts of clay, 5-10 parts of silicon micropowder, 10-15 parts of oxidant and 5-7 parts of metal oxide.
By adopting the technical scheme, the remediation agent consisting of the stabilizing and curing agent and the soil conditioner can make heavy metals such as cadmium, mercury, arsenic, lead, copper, nickel and zinc in the soil lose biological effectiveness, and can adsorb and remove organic pollutants such as hexachloro-cyclohexane, dichlorodiphenyl trichloroethane and benzopyrene in the soil, so that the soil recovers the standard suitable for planting plants, the soil structure can be improved under the action of the soil conditioner, the hardened condition of the soil is reduced, the loose degree and the air permeability of the soil are improved, and the soil conditioner is more suitable for planting plants which like acid soil.
Further, the chitosan modified zeolite adsorbent is prepared by adopting the following method:
mixing chitosan and 1-2.5wt% of acetic acid solution according to the weight ratio of 1 (20-30) to prepare chitosan acetic acid solution;
secondly, mixing the zeolite powder, the sodium potassium tartrate, the sodium silicate, the tea saponin and the water according to the weight ratio of 1 (0.1-0.2) to 0.4-0.6) to 0.1 (20-40) to obtain suspension, and adding alkali liquor into the suspension to adjust the pH value of the suspension to 9-10;
thirdly, dripping a chitosan acetic acid solution into the suspension liquid after the pH is adjusted, stirring for 10-30min, heating for 6-10h at the temperature of 40-60 ℃, then carrying out centrifugal treatment to obtain a precipitate, washing the precipitate to be neutral by deionized water, drying for 12-36h at the temperature of 60-70 ℃ to obtain a dried substance, and crushing and sieving the dried substance to obtain the chitosan modified zeolite adsorbent.
Through adopting above-mentioned technical scheme, through the cooperation of lime, silica powder, oxidant, metal oxide and chitosan modified zeolite adsorbent for soil is alkaline, in order to reduce the solubility of heavy metal, makes its heavy metal form difficult migration, the heavy metal precipitate of low activity, can adsorb organic pollutant and heavy metal precipitate in the soil through the cooperation of clay and chitosan modified zeolite adsorbent, thereby prevent the migration, the diffusion of heavy metal precipitate and organic pollutant in the environment.
Further, the alkali liquor in the step (II) is 10-20wt% of sodium hydroxide solution or potassium hydroxide solution.
By adopting the technical scheme, the pH of the suspension is adjusted by the sodium hydroxide solution and the potassium hydroxide solution, which is beneficial to improving the reaction of the suspension and the chitosan acetic acid solution.
Further, the clay is one of bentonite, diatomite and attapulgite or a composite of the bentonite, the diatomite and the attapulgite.
By adopting the technical scheme, the bentonite, the diatomite and the attapulgite have certain viscosity, and the adsorption effect of the chitosan modified zeolite adsorbent on heavy metal precipitates and organic pollutants can be improved.
Further, the metal oxide is one of magnesium oxide and aluminum oxide or a composite of the magnesium oxide and the aluminum oxide.
By adopting the technical scheme, the magnesium oxide and the aluminum oxide both belong to alkaline metal oxides, so that the soil can keep an alkaline environment due to the generation of metal precipitates.
Further, the oxidant is one of sodium persulfate, potassium persulfate and magnesium peroxide or a composite of the sodium persulfate, the potassium persulfate and the magnesium peroxide.
Further, the soil conditioner comprises the following raw materials in parts by weight: 30-40 parts of camellia dregs, 10-15 parts of ferrous sulfate, 10-15 parts of humic acid, 3-6 parts of monopotassium phosphate and 1-2 parts of calcium superphosphate.
By adopting the technical scheme, the soil conditioner obtained by mixing the camellia sinensis residues, the ferrous sulfate, the humic acid, the monopotassium phosphate and the calcium superphosphate can adjust the pH value of soil, repair the damage of the stabilizing and curing agent to the soil structure, reduce the hardened condition of the soil, improve the loosening degree and the air permeability of the soil and enable the soil conditioner to be more suitable for planting plants which like acid soil.
The invention also aims to provide an application method of the site-contaminated soil ex-situ remediation agent.
The technical purpose of the invention is realized by the following technical scheme:
an application method of a site-contaminated soil ex-situ remediation agent comprises the following steps:
s1, taking the polluted soil, crushing and screening the polluted soil to obtain polluted soil particles with the particle size of less than 5 mm;
s2, adding the stabilizing and curing agent into the polluted soil particles, uniformly mixing, and standing for 6-8 hours;
s3, spraying water on the contaminated soil particles added with the stabilizing and curing agent every day, maintaining for 3-5 days, maintaining for 7-10 days, and separating the soil from the leaching solution to obtain the soil to be repaired;
and S4, after maintenance, adding a soil conditioner into the pre-repaired soil, uniformly mixing, and standing for 6-10h to obtain the repaired soil.
Through adopting above-mentioned technical scheme, contaminated soil can make it obtain the standard after chemical remediation, but the alkaline material that adds in prosthetic in-process can cause the change of soil structure for soil hardening, hardening phenomenon appear, consequently through adding soil amendment to the soil of restoreing in advance, can carry out further restoration to soil, makes it can reach the level that is fit for vegetation.
Further, the curing conditions of S3 are: the temperature is 20-25 deg.C and the humidity is 95% RH.
By adopting the technical scheme, the repairing agent can be maintained under the conditions that the temperature is 20-25 ℃ and the humidity is 95% RH, so that the repairing agent can fully react with heavy metal.
Furthermore, the weight ratio of the polluted soil particles, the stable curing agent, the daily spray water and the soil conditioner is 1 (0.05-0.1): (0.02-0.08): 0.01-0.03).
In summary, compared with the prior art, the invention has the following beneficial effects:
1. the remediation agent consisting of the stabilizing curing agent and the soil conditioner can make heavy metals such as cadmium, mercury, arsenic, lead, copper, nickel and zinc in the soil lose biological effectiveness, and can adsorb and remove organic pollutants such as hexachloro-cyclohexane, dichlorodiphenyl trichloroethane and benzopyrene in the soil, so that the soil is recovered to be suitable for the standard of planting plants, and under the action of the soil conditioner, the soil structure can be improved, the soil hardening condition is reduced, the loosening degree and the air permeability of the soil are improved, and the soil conditioner is more suitable for planting plants which like acid soil;
2. through the cooperation of the quick lime, the silicon micropowder, the oxidant, the metal oxide and the chitosan modified zeolite adsorbent, the soil is alkaline, so that the solubility of heavy metals is reduced, the heavy metals form heavy metal precipitates which are difficult to migrate and have low activity, and through the cooperation of the clay and the chitosan modified zeolite adsorbent, organic pollutants and heavy metal precipitates in the soil can be adsorbed, so that the heavy metal precipitates and the organic pollutants are prevented from migrating and diffusing in the environment;
3. the soil conditioner obtained by mixing the camellia sinensis residue, the ferrous sulfate, the humic acid, the monopotassium phosphate and the calcium superphosphate can adjust the pH value of soil, repair the damage of a stable curing agent to the soil structure, reduce the soil hardening condition, improve the loosening degree and the air permeability of the soil and enable the soil conditioner to be more suitable for planting plants which are favored by acid soil;
4. after the polluted soil is chemically repaired, the polluted soil can be standardized, but the alkaline substances added in the repairing process can cause the change of the soil structure, so that the soil is hardened and hardened, and therefore, the soil can be further repaired by adding the soil conditioner into the soil to be repaired, and the level suitable for the growth of plants can be achieved.
Detailed Description
The present invention will be described in further detail below.
Preparation example of Chitosan-modified Zeolite adsorbent
Preparation example 1: mixing chitosan with the deacetylation degree of 95% and 1 wt% of acetic acid solution according to the weight ratio of 1:20 to prepare chitosan acetic acid solution;
secondly, mixing zeolite powder with the fineness of 100 meshes, sodium potassium tartrate, sodium silicate, tea saponin and water according to the weight ratio of 1:0.1:0.4:0.1:20 to obtain suspension, adding 10 wt% of sodium hydroxide solution into the suspension, and adjusting the pH value to be 9;
③ taking 50kg of suspension, dripping 30kg of chitosan acetic acid solution into the suspension while stirring, finishing dripping within 1h, stirring for 10min, heating for 6h at the temperature of 40 ℃, centrifuging for 10min at the speed of 8000r/min to obtain a precipitate, washing the precipitate to be neutral by deionized water, drying for 12h at the temperature of 60 ℃ to obtain a dried substance, and crushing and sieving the dried substance to obtain the chitosan modified zeolite adsorbent.
Preparation example 2: mixing chitosan with the deacetylation degree of 95% and 1.8 wt% of acetic acid solution according to the weight ratio of 1:25 to prepare a chitosan acetic acid solution;
secondly, mixing zeolite powder with the fineness of 100 meshes, sodium potassium tartrate, sodium silicate, tea saponin and water according to the weight ratio of 1:0.15:0.5:0.1:30 to obtain suspension, adding 15 wt% of potassium hydroxide solution into the suspension, and adjusting the pH value to 10;
③ taking 50kg of suspension, dripping 30kg of chitosan acetic acid solution into the suspension while stirring, finishing dripping within 1h, stirring for 20min, heating for 8h at the temperature of 50 ℃, centrifuging for 10min at the speed of 8000r/min to obtain precipitate, washing the precipitate to be neutral by deionized water, drying for 24h at the temperature of 65 ℃ to obtain dried substance, crushing and sieving the dried substance to obtain the chitosan modified zeolite adsorbent.
Preparation example 3: mixing chitosan with the deacetylation degree of 95% and 2.5wt% of acetic acid solution according to the weight ratio of 1:30 to prepare chitosan acetic acid solution;
secondly, mixing zeolite powder with the fineness of 100 meshes, sodium potassium tartrate, sodium silicate, tea saponin and water according to the weight ratio of 1:0.2:0.6:0.1:40 to obtain suspension, adding 20wt% of sodium hydroxide solution into the suspension, and adjusting the pH value to be 9;
③ taking 50kg of suspension, dripping 30kg of chitosan acetic acid solution into the suspension while stirring, finishing dripping within 1h, stirring for 30min, heating for 10h at the temperature of 60 ℃, centrifuging for 10min at the speed of 8000r/min to obtain precipitate, washing the precipitate to be neutral by deionized water, drying for 36h at the temperature of 70 ℃ to obtain dried substance, crushing and sieving the dried substance to obtain the chitosan modified zeolite adsorbent.
Preparation example 4: the difference between the preparation example and the preparation example 1 is that the step (II) does not contain potassium sodium tartrate, sodium silicate and tea saponin.
Second, example
Example 1: the site-contaminated soil ectopic remediation agent is prepared by the following method:
40kg of chitosan modified zeolite adsorbent (selected from preparation example 1 of chitosan modified zeolite adsorbent), 20kg of quicklime, 15kg of bentonite, 5kg of silicon micropowder, 10kg of sodium persulfate and 5-7kg of magnesium oxide are taken and uniformly stirred to obtain the stable curing agent.
Taking 30kg of camellia residues, 10kg of ferrous sulfate, 10kg of humic acid, 3kg of monopotassium phosphate and 1kg of calcium superphosphate, and uniformly stirring to obtain the soil conditioner.
Example 2: the site-contaminated soil ectopic remediation agent is prepared by the following method:
45kg of chitosan-modified zeolite adsorbent (selected from preparation example 2 of chitosan-modified zeolite adsorbent), 25kg of quicklime, 17.5kg of diatomite, 7.5kg of silica micropowder, 12.5kg of potassium persulfate and 6kg of alumina were taken and uniformly stirred to obtain a stable curing agent.
Taking 35kg of camellia residue, 12.5kg of ferrous sulfate, 12.5kg of humic acid, 4.5kg of monopotassium phosphate and 1.5kg of calcium superphosphate, and uniformly stirring to obtain the soil conditioner.
Example 3: the site-contaminated soil ectopic remediation agent is prepared by the following method:
50kg of chitosan-modified zeolite adsorbent (selected from preparation example 3 of chitosan-modified zeolite adsorbent), 30kg of quicklime, 20kg of attapulgite, 10kg of silica micropowder, 15kg of magnesium peroxide, 3.5kg of magnesium oxide and 3.5kg of aluminum oxide were uniformly stirred to obtain a stable curing agent.
Taking 40kg of camellia sinensis dregs, 15kg of ferrous sulfate, 15kg of humic acid, 6kg of monopotassium phosphate and 2kg of calcium superphosphate, and uniformly stirring to obtain the soil conditioner.
Third, application example
Application example 1: an application method of a site-contaminated soil ex-situ remediation agent comprises the following steps:
s1, taking 10kg of polluted soil, crushing and screening the polluted soil to obtain polluted soil particles with the particle size of less than 5 mm;
s2, putting 0.05kg of stabilizing and curing agent (selected from example 1) into the polluted soil particles, uniformly mixing, and standing for 6-8 h;
s3, spraying 0.02kg of water on the polluted soil particles added with the stabilizing and curing agent every day, maintaining for 7 days under the conditions that the temperature is 20 ℃ and the humidity is 95% RH after continuing for 3 days, and separating the soil from the leachate to obtain the soil to be repaired;
s4, after maintenance, adding 0.01kg of soil conditioner (selected from example 1) into the pre-repaired soil, uniformly mixing, and standing for 6 hours to obtain the repaired soil.
Application example 2: an application method of a site-contaminated soil ex-situ remediation agent comprises the following steps:
s1, taking 10kg of polluted soil, crushing and screening the polluted soil to obtain polluted soil particles with the particle size of less than 5 mm;
s2, adding 0.075kg of stabilizing and curing agent (selected from example 2) into the polluted soil particles, uniformly mixing, and standing for 6-8 h;
s3, spraying 0.05kg of water on the polluted soil particles added with the stabilizing and curing agent every day, maintaining for 8 days under the conditions that the temperature is 23 ℃ and the humidity is 95% RH after continuing for 4 days, and separating the soil from the leachate to obtain the soil to be repaired;
s4, after maintenance, adding 0.02kg of soil conditioner (selected from example 2) into the pre-repaired soil, uniformly mixing, and standing for 8 hours to obtain the repaired soil.
Application example 3: an application method of a site-contaminated soil ex-situ remediation agent comprises the following steps:
s1, taking 10kg of polluted soil, crushing and screening the polluted soil to obtain polluted soil particles with the particle size of less than 5 mm;
s2, adding 0.1kg of stabilizing and curing agent (selected from example 3) into the polluted soil particles, uniformly mixing, and standing for 8 hours;
s3, spraying 0.08kg of water on the polluted soil particles added with the stabilizing and curing agent every day, maintaining for 5 days, then maintaining for 10 days under the conditions that the temperature is 25 ℃ and the humidity is 95% RH, and separating the soil from the leachate to obtain the soil to be repaired;
s4, after maintenance, adding 0.03kg of soil conditioner (selected from example 3) into the pre-repaired soil, uniformly mixing, and standing for 10 hours to obtain the repaired soil.
Fourth, comparative example
Comparative example 1: this comparative example is different from example 1 in that the raw material of the stabilizing and curing agent does not contain the chitosan-modified zeolite adsorbent.
Comparative example 2: this comparative example is different from example 1 in that the chitosan-modified zeolite adsorbent was prepared from preparation example 4.
Fifth, comparative example
Comparative example 1: the comparative example is different from application example 1 in that the stable curing agent was selected from comparative example 1.
Comparative example 2: the comparative example is different from application example 1 in that the stable curing agent was selected from comparative example 2.
Comparative example 3: the difference between this comparative example and application example 1 is that no soil conditioner was added to the pre-remediated soil after the curing at S4.
Sixth, effect test and analysis
1. Selecting a land with heavy metals and organic pollutants exceeding standards, repairing the polluted soil by the methods in application examples 1-3 and comparative examples 1-3, detecting the contents of the heavy metals and the organic matters in the soil before and after repairing according to GB15618-2018 soil environmental quality agricultural land soil pollution risk control standard, and showing test results in tables 1 and 2.
Table 1 units: mg/kg
TABLE 2
As can be seen from the data in Table 1, the contents of heavy metals and organic pollutants in the polluted soil treated by the method of the invention meet the requirements of soil environmental quality standards, and the remediation agent of the invention has good remediation effect on the soil polluted by the heavy metals and the organic matters.
According to the data in tables 1 and 2, the stabilizing and curing agent of comparative example 1 was prepared from comparative example 1, and the chitosan-modified zeolite adsorbent was not added to the stabilizing and curing agent; compared with the application example 1, the remediation effect of the control example 1 on the contaminated soil is obviously deteriorated, which shows that the addition of the chitosan modified zeolite adsorbent can obviously improve the remediation effect of the remediation agent on the contaminated soil.
The stabilizing and curing agent of comparative example 2 was prepared from comparative example 2, and the chitosan-modified zeolite adsorbent in the stabilizing and curing agent was prepared from preparation example 4 without adding sodium potassium tartrate, sodium silicate and tea saponin; compared with the application example 1, the remediation effect of the control example 2 on the contaminated soil is obviously poor, but the remediation effect of the control example 2 on the contaminated soil is better than that of the control example 1, and as can be seen from the application example 1, the control example 1 and the control example 2, the addition of the chitosan modified zeolite adsorbent can obviously improve the remediation effect of the remediation agent on the contaminated soil, and the addition of the sodium potassium tartrate, the sodium silicate and the tea saponin can obviously improve the remediation effect of the chitosan modified zeolite adsorbent on the contaminated soil.
2. Selecting a land with heavy metals and organic pollutants exceeding standards, averagely dividing the land into 4 parts, namely a land 1, a land 2, a land 3 and a land 4, respectively adopting the application example 1 and the methods in the comparative examples 1-3 to carry out ex-situ remediation, planting the branches of the osmanthus trees on the land 1-4 by adopting a cutting planting mode after the remediation, normally irrigating and fertilizing, recording the survival rate of the branches of the osmanthus trees planted by cutting, and showing test results in a table 3.
TABLE 3
| Application example 1 | Comparative example 1 | Comparative example 2 | Comparative example 3 | |
| Survival rate% | 86.7 | 53.4 | 72.1 | 33.5 |
As can be seen from the data in table 3, the soil restored by the method of the present invention is acidic and is more suitable for the growth of the cinnamomum cassia tree, the soil in the comparative example 1 and the comparative example 2 is acidic, but the heavy metal and the organic matter contained in the soil are high in content, which is not beneficial to the growth of the cinnamomum cassia tree, while the soil in the comparative example 3 is alkaline, which is not beneficial to the growth of the cinnamomum cassia tree, because the soil is not improved; the heavy metal and the organic matter are easy to generate precipitates which are difficult to migrate in the alkaline environment, so that the repaired soil is alkaline, and the repairing medicament provided by the invention has a good adsorption effect on the heavy metal precipitates and the organic pollutants, so that the repaired soil can still keep a good repairing effect in the acidic environment.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (8)
1. The utility model provides a place pollutes soil dystopy and restores medicament which characterized in that: the soil conditioner consists of a stabilizing curing agent and a soil conditioner; the stabilizing curing agent comprises the following components in parts by weight: 40-50 parts of chitosan modified zeolite adsorbent, 20-30 parts of quicklime, 15-20 parts of clay, 5-10 parts of silicon micropowder, 10-15 parts of oxidant and 5-7 parts of metal oxide;
the chitosan modified zeolite adsorbent is prepared by adopting the following method:
mixing chitosan and 1-2.5wt% of acetic acid solution according to the weight ratio of 1 (20-30) to prepare chitosan acetic acid solution;
secondly, mixing the zeolite powder, the sodium potassium tartrate, the sodium silicate, the tea saponin and the water according to the weight ratio of 1 (0.1-0.2) to 0.4-0.6) to 0.1 (20-40) to obtain suspension, and adding alkali liquor into the suspension to adjust the pH value of the suspension to 9-10;
thirdly, dripping a chitosan acetic acid solution into the suspension liquid after the pH is adjusted, stirring for 10-30min, heating for 6-10h at the temperature of 40-60 ℃, then carrying out centrifugal treatment to obtain a precipitate, washing the precipitate to be neutral by deionized water, drying for 12-36h at the temperature of 60-70 ℃ to obtain a dried substance, and crushing and sieving the dried substance to obtain the chitosan modified zeolite adsorbent;
the soil conditioner comprises the following raw materials in parts by weight: 30-40 parts of camellia dregs, 10-15 parts of ferrous sulfate, 10-15 parts of humic acid, 3-6 parts of monopotassium phosphate and 1-2 parts of calcium superphosphate.
2. The site-contaminated soil ex-situ remediation agent of claim 1, wherein: the alkali liquor in the step (II) is 10-20wt% of sodium hydroxide solution or potassium hydroxide solution.
3. The site-contaminated soil ex-situ remediation agent of claim 1, wherein: the clay is one or the combination of bentonite, diatomite and attapulgite.
4. The site-contaminated soil ex-situ remediation agent of claim 1, wherein: the metal oxide is one of magnesium oxide and aluminum oxide or a composite of the magnesium oxide and the aluminum oxide.
5. The site-contaminated soil ex-situ remediation agent of claim 1, wherein: the oxidant is one or the composition of sodium persulfate, potassium persulfate and magnesium peroxide.
6. An application method of the agent for ex-situ remediation of site-contaminated soil according to any one of claims 1 to 5, wherein: the method comprises the following steps:
s1, taking the polluted soil, crushing and screening the polluted soil to obtain polluted soil particles with the particle size of less than 5 mm;
s2, adding the stabilizing and curing agent into the polluted soil particles, uniformly mixing, and standing for 6-8 hours;
s3, spraying water on the contaminated soil particles added with the stabilizing and curing agent every day, maintaining for 3-5 days, maintaining for 7-10 days, and separating the soil from the leaching solution to obtain the soil to be repaired;
and S4, after maintenance, adding a soil conditioner into the pre-repaired soil, uniformly mixing, and standing for 6-10h to obtain the repaired soil.
7. The application method of the site-contaminated soil ex-situ remediation agent according to claim 6, wherein the application method comprises the following steps: the curing conditions of S3 are as follows: the temperature is 20-25 deg.C and the humidity is 95% RH.
8. The application method of the site-contaminated soil ex-situ remediation agent according to claim 6, wherein the application method comprises the following steps: the weight ratio of the polluted soil particles, the stable curing agent, the daily spray water and the soil conditioner is 1 (0.05-0.1): (0.02-0.08): 0.01-0.03).
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| CN111676018A (en) * | 2020-06-08 | 2020-09-18 | 北京高能时代环境技术股份有限公司 | In-situ remediation medicament for contaminated site and construction method |
| CN112122334A (en) * | 2020-09-08 | 2020-12-25 | 浙江省冶金研究院有限公司 | Method for repairing organic-heavy metal combined contaminated soil by coupling chemical oxidation with biochar and strengthening microorganisms |
| CN112808768A (en) * | 2021-01-07 | 2021-05-18 | 陈琴珠 | Remediation method for heavy metal contaminated soil |
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| CN114956628B (en) * | 2022-05-12 | 2023-06-02 | 昆明理工大学 | High-strength phosphogypsum-based recycled aggregate and preparation method thereof |
| CN115502199B (en) * | 2022-09-29 | 2023-04-11 | 生态环境部南京环境科学研究所 | Ectopic solidification stabilization repair process for removing heavy metals in soil |
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| JP2005146275A (en) * | 2003-10-24 | 2005-06-09 | Growth Factor:Kk | Agent for improving, solidifying, and stabilizing soil and its quality |
| KR101081083B1 (en) * | 2009-07-24 | 2011-11-07 | 이현석 | A functional soil conditioner and manufacturing method thereof |
| CN103881727B (en) * | 2014-03-12 | 2016-03-23 | 江苏维尔利环保科技股份有限公司 | The stabilizing and curing agent of remediating heavy metal and toxic organic compound combined contamination soil and using method thereof |
| CN105694902B (en) * | 2016-01-28 | 2019-03-05 | 湖南大学 | Passivator and its preparation method and application for heavy-metal contaminated soil |
| CN107739615A (en) * | 2017-10-20 | 2018-02-27 | 阳艳华 | A kind of lead-contaminated soil renovation agent and preparation method thereof |
| CN108213073A (en) * | 2018-01-04 | 2018-06-29 | 台州泰捷化工科技有限公司 | A kind of restorative procedure of heavy-metal contaminated soil |
| CN110079332B (en) * | 2019-05-09 | 2021-05-07 | 上杭鑫昌龙实业有限公司 | Soil conditioner and preparation method and use method thereof |
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