CN108690623B - Nickel-polluted soil remediation agent and preparation method and use method thereof - Google Patents
Nickel-polluted soil remediation agent and preparation method and use method thereof Download PDFInfo
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- CN108690623B CN108690623B CN201810501086.4A CN201810501086A CN108690623B CN 108690623 B CN108690623 B CN 108690623B CN 201810501086 A CN201810501086 A CN 201810501086A CN 108690623 B CN108690623 B CN 108690623B
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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
- C09K17/02—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only
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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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- 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
Abstract
The invention provides a nickel-contaminated soil remediation agent and a preparation method and a use method thereof. The nickel-contaminated soil remediation agent comprises the following components in parts by weight: 15-35 parts of nickel modifier, 30-60 parts of reducing sulfide and 20-40 parts of reducing iron salt. The nickel-contaminated soil restoration agent has the advantages of low cost, simple preparation method, short restoration period, wide application range and convenient field application, and can obtain good restoration effect on nickel-contaminated soil after being applied and maintained for 7 days; and each component is nontoxic and harmless, can keep the structure and acid-base balance of the soil, does not influence the value of the soil, and can ensure that the soil can be continuously utilized for a long time.
Description
Technical Field
The invention belongs to the technical field of contaminated soil remediation, and relates to a nickel contaminated soil remediation agent, and a preparation method and a use method thereof.
Background
Nickel is a transition metal which is very important in production and living, and the average abundance in the earth crust is 75 × 10-6The trace elements are elements with relatively rich content. Nickel pollution is environmental pollution caused by nickel and compounds thereof, the sources of nickel in soil are multi-path, including nickel contained in a matrix of the soil and various forms of nickel generated by the activities of human industry and agriculture, and the settling of atmospheric particulate matters containing nickel, the irrigation of nickel-containing wastewater, solid wastes containing nickel, the decay of animal and plant residues and the like are all sources of nickel in soil.
Since the beginning of the 20 th century after the 19 th century, reaction residues, deactivated catalysts, plating residues, bath solution and the like generated in the nickel industry are discharged in large quantities, and soil nickel pollution is caused. Meanwhile, in agricultural production, because of unreasonable sewage irrigation of human beings, excessive use of chemical fertilizers and pesticides, and large use of plastic greenhouses and mulching films, the nickel pollution is aggravated. Nickel contamination has the following characteristics: the pollution range is wide, and the duration is long; is not easy to decompose and accumulate; hidden pollution, great harm and the like. The nickel in the water is often halide, nitrate and sulfurAcid salts and certain inorganic and organic complex forms are soluble in water; while in soil, organic matter is an important chelating agent, among which carboxyl (-COOH), hydroxyl (-OH), carbonyl (-CO) and amino (-NH)2) The humic acid can be complexed or chelated with nickel, so that the water-soluble state and the exchange state of the humic acid are obviously reduced, particularly, the humic acid can form insoluble salts with the nickel, and the complexing stability constant of the humic acid is increased along with the increase of pH.
Aiming at the current situation of serious soil nickel pollution in China, partial nickel is difficult to restore and reach the standard, the restoring process and the restoring method cannot cause secondary pollution to the soil and cannot influence the functions and normal use of the fields such as industrial fields, agricultural fields and the like, and a soil restoring agent or a soil restoring method which is efficient, low in cost, safe and short in restoring period is required to be found. The solidification and stabilization technology has the advantages of high efficiency, quick repair, simple operation and the like, so the technology is concerned more and more in the field of nickel-polluted soil repair.
CN104841691A discloses a method for repairing heavy metal nickel contaminated soil, which comprises the following steps: 1) spraying an acetic acid solution with the mass fraction of 10% onto the nickel-polluted soil for leaching, wherein the mass ratio of the acetic acid solution to the nickel-polluted soil is 1: 1; 2) standing for 12h at normal temperature; 3) separating the washed soil from the wastewater containing heavy metals; 4) the method comprises the steps of placing leached heavy metal nickel contaminated soil into an electrolytic tank filled with water, arranging an anode chamber and a cathode chamber at two ends of the electrolytic tank, respectively separating the anode chamber and the cathode chamber from the leached soil by using a plastic net filled with an ion exchange membrane, respectively containing deionized water in the anode chamber and the cathode chamber, enabling the pH value of the deionized water in the anode chamber to be 3 and the pH value of the deionized water in the cathode chamber to be 7, applying direct current with the voltage gradient of 2V/cm between the cathode chamber and the anode chamber through a graphite electrode, and enabling residual heavy metal ions to move to a cathode under the action of potential and enter the cathode chamber for recycling. The method for repairing the heavy metal nickel contaminated soil has the advantages of high removal rate of heavy metals, energy conservation, small influence on soil fertility, and complex process.
CN106190166A discloses a nickel-contaminated soil repairing agent and a preparation method thereof, wherein the nickel-contaminated soil repairing agent comprises the following main raw materials in parts by weight: 20-30 parts of polyaniline surface modified diatomite, 20-30 parts of polylactic acid, 15-20 parts of corn straw, 10-18 parts of 1-methyl-2-pyrrolidone, 10-15 parts of vinyl acetate, 10-15 parts of bean dregs and 4-8 parts of sodium sulfate. After the nickel-polluted soil repairing agent is used for repairing polluted soil, the nickel concentration is reduced to be below 40mg/kg, and the requirement of the national second-level soil quality standard is met.
CN106734183A discloses a method for restoring nickel contaminated soil in a mining area, the soil restoration agent of the invention consists of an adsorption carrier and effective viable bacteria adsorbed on the carrier, and the total number of the effective viable bacteria contained in each gram of the soil restoration agent is (5-150) x 108 CFU; the effective live bacteria are formed by mixing halomonas, colloidal bacillus and Coriolus versicolor sporotrichum, and the ratio of the effective live bacteria number of the halomonas, the colloidal bacillus and the Coriolus versicolor sporotrichum is 1.5-2: 1-2: 2-3.5, wherein the adsorption carrier is prepared by mixing coconut coir, diatomite and bentonite according to a weight ratio of 1:2: 1; the slow-release particles are prepared from 120-140 parts by weight of linseed cake meal, 50-60 parts by weight of peony seed hulls, 100-120 parts by weight of straws, 30-40 parts by weight of bamboo charcoal powder and 150-200 parts by weight of modified rice bran protein solution, wherein the modified rice bran protein solution is prepared by mixing 10-15 parts by weight of rice bran protein and 100-120 parts by weight of distilled water, sequentially adding 0.5-1 part by weight of glutamine transaminase and 0.1-0.2 part by weight of potassium diformate, and heating for 2 hours at the temperature of 45-50 ℃. The soil remediation agent has high remediation efficiency, low cost and no secondary pollution.
CN106590682A discloses a nickel-contaminated soil remediation agent, which is prepared by compounding 22-30 parts of tobermorite, 5-8 parts of giant sargassum, 5-8 parts of Gymnodinium henryi and 4-7 parts of modified multiflower rose pyroxene, wherein the dosage ratio of the giant sargassum to the Gymnodinium henryi is 1: 1; the preparation method of the modified spodumene comprises the following steps: micronizing the spodumene until the particle size is 5-10 mu m to obtain spodumene powder; mixing spodumene powder with 1.8-2.3 times of N-maleylation chitosan by mass, and dispersing the mixture in 2-3 times of ethanol solution with volume concentration of 92-95% by mass to obtain suspension slurry; continuously treating the suspension slurry with ultrasonic waves with the power of 200-220W and the frequency of 32-34 kHz for 40-45 min, removing ethanol through concentration under reduced pressure, and drying at the temperature of 105-110 ℃ for 2-3 h to obtain modified multiflower rose pyroxene; the nickel-contaminated soil remediation agent can obviously reduce the content of leached nickel in soil, and meanwhile, the whole remediation process has no secondary pollution.
CN106753409A discloses a nickel-contaminated soil remediation agent, which is prepared by compounding 23-28 parts of diatomite, 5-8 parts of mozzie silks, 5-8 parts of naked dry sauerkraut and 4-7 parts of chrysolite, wherein the dosage ratio of the mozzie silks to the naked dry sauerkraut is 1: 1; the preparation method of the bronze stone comprises the following steps: micronizing the spodumene until the particle size is 5-10 mu m to obtain spodumene powder; mixing spodumene powder with 1.8-2.3 times of N-maleylation chitosan, and dispersing in a 92-95% ethanol solution with volume concentration of 2-3 times of the total mass to obtain suspension slurry; continuously treating the suspension slurry with ultrasonic waves with the power of 200-220W and the frequency of 32-34 kHz for 40-45 min, removing ethanol through concentration under reduced pressure, and drying at the temperature of 105-110 ℃ for 2-3 h to obtain the bronze; the nickel-contaminated soil remediation agent can obviously reduce the content of leached nickel in soil, and has no secondary pollution.
However, the problem of pollution caused by nickel in soil, especially nickel in a complex state, only by using inorganic soil remediation materials is still not a remarkable result, and deep research is still needed. Therefore, how to develop a simple, effective and economical curing and stabilizing repairing agent for treating nickel-contaminated soil is urgent to be solved.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a nickel-contaminated soil repairing agent which is environment-friendly, low in cost, short in repairing period and good in repairing effect on heavy metal nickel. According to the invention, through the synergistic cooperation of the three raw materials, the nickel in the soil is chemically stabilized, so that the soil can be continuously utilized for a long time. Meanwhile, the invention is convenient for field application and can not influence the utilization value of the soil.
In order to achieve the purpose, the invention adopts the following technical scheme:
the nickel-contaminated soil remediation agent comprises the following components in parts by weight:
15-35 parts of nickel modifier
30-60 parts of reducing sulfide
20-40 parts of reducing iron salt.
Wherein, the weight portion of the nickel modifier can be 15 parts, 20 parts, 25 parts, 30 parts or 35 parts, etc., but is not limited to the enumerated values, and other unrecited values in the numerical range are also applicable; the weight parts of the reducing sulfide can be 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts or 60 parts, but the weight parts are not limited to the enumerated values, and other unrecited values in the numerical range are also applicable; the amount of the reduced iron salt may be 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, etc., but is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.
According to the invention, the nickel-contaminated soil remediation agent takes three substances of a nickel modifier, a reducing sulfide and a reducing iron salt as key substances, chemically stabilizes nickel in soil through the synergistic effect of the three substances, and simultaneously keeps the structure and acid-base balance of the soil, so that the soil can be continuously utilized for a long time, and ideal remediation effect cannot be achieved by singly adding any substance.
In the invention, the nickel modifier is one or a mixture of at least two of sodium hypochlorite, potassium hypochlorite and barium chloride, and can also be a non-oxidation modifier, namely barium chloride. The former can oxidize organic ligands in the nickel compound into stable carbon dioxide and water molecules through self strong oxidizing ability; the latter non-oxidation modifier barium chloride passes through Ba2+Interacting with the single-site complex to remove the coordination group from the coordinated nickel ion in the single-nickel complex to form free Ni2+。
The reducing sulfide is one or a mixture of at least two of sodium sulfide, potassium sulfide and calcium polysulfide, can improve the pH value of soil, and can enable nickel to form a form of nickel sulfide, nickel hydroxide or nickel carbonate.
The reducing iron salt is one or a mixture of at least two of ferrous sulfate, ferrous chloride and ferrous nitrate. The reducing ferric salt takes ferrous iron as a main component, can generate iron (hydrogen) oxide, can reduce the pH value of soil, is cheap and easy to obtain, and has no secondary pollution.
As a preferred scheme, the nickel-contaminated soil remediation agent comprises the following components in parts by weight:
20-30 parts of nickel modifier
40-50 parts of reducing sulfide
25-35 parts of reducing iron salt.
More preferably, the nickel-contaminated soil remediation agent comprises the following components in parts by weight:
25 parts of nickel modifier
45 parts of reducing sulfide
30 parts of reducing iron salt.
In the invention, the proportion of each raw material substance is not added at will, and the dosage of each substance has a key influence on the chemical stabilization effect of nickel, so the proportion of each raw material substance needs to be reasonably adjusted. Preferably, the best stabilization effect is achieved when the mass ratio of barium chloride, sodium sulfide and ferrous chloride is 5:9: 6.
Preferably, the nickel modifier is barium chloride.
Preferably, the reducing sulphide is sodium sulphide.
Preferably, the reducing iron salt is ferrous chloride.
As a further preferable scheme, the nickel-contaminated soil remediation agent comprises the following components in parts by weight:
25 portions of barium chloride
45 parts of sodium sulfide
30 parts of ferrous chloride.
The invention also aims to provide a preparation method of the nickel-contaminated soil remediation agent, which comprises the following steps: mixing 15-35 parts by weight of nickel modifier, 30-60 parts by weight of reducing sulfide and 20-40 parts by weight of reducing iron salt, and grinding to obtain the nickel contaminated soil remediation agent.
The invention also aims to provide a using method of the nickel-contaminated soil remediation agent, which is characterized in that the nickel-contaminated soil remediation agent is applied to nickel-contaminated soil, wherein the mass of the nickel-contaminated soil remediation agent is 1-5% of that of the nickel-contaminated soil; for example, the addition ratio of the nickel-contaminated soil remediation agent is 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5% of the mass of the nickel-contaminated soil, but is not limited to the recited values, and other values not recited in the range of the values are also applicable, and the addition ratio is preferably 4%.
Preferably, the method for using the nickel-contaminated soil remediation agent comprises the steps of sufficiently and uniformly mixing the nickel-contaminated soil remediation agent and the nickel-contaminated soil through a 0.5-2 mm sieve, adjusting the water content to 20-35%, for example, adjusting the water content to 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34% and 35%, and performing maintenance for 7 days at room temperature to restore the nickel-contaminated soil.
Compared with the prior art, the invention has the beneficial effects that:
(1) the nickel-polluted soil remediation agent mainly comprises three components, namely a nickel modifier, a reductive sulfide and a reductive iron salt, and chemically stabilizes nickel in soil, particularly nickel in a complex state through the synergistic effect of the three components, so that the concentration content of nickel in a soil leachate meets the requirements of the class III of surface water environment quality standards (GB3838-2002) and the class IV of underground water quality standards (GB/T14848-93), and the nickel-polluted soil remediation agent has a good remediation effect. When the nickel-contaminated soil repairing agent with the mass ratio of 4% is added into the nickel-contaminated soil, the leaching concentration of nickel in the original soil is greatly reduced, the reduction amplitude reaches more than 93.8%, and the leaching concentration is reduced from 7.18mg/L to 0.447 mg/L; after the nickel-contaminated soil remediation agent is added, the pH value of the soil is changed from 2.95 to 6.57 before and after remediation, and the requirement of 6-9 of the pH value is met.
(2) The nickel-contaminated soil remediation agent disclosed by the invention is low in cost, simple in preparation method, short in remediation period, wide in application range and convenient for field application, and can obtain a good nickel-contaminated soil remediation effect after being applied in a scattering manner and maintained for 7 days.
(3) The nickel-contaminated soil remediation agent disclosed by the invention is nontoxic and harmless in each component, can keep the structure and acid-base balance of soil, does not influence the value of the soil, and can be continuously utilized for a long time.
Detailed Description
The technical solution of the present invention is further illustrated by the following specific embodiments.
Unless otherwise specified, various starting materials of the present invention are commercially available or prepared according to conventional methods in the art.
The nickel-contaminated soil remediation agent comprises the following components in parts by weight:
15-35 parts of nickel modifier
30-60 parts of reducing sulfide
20-40 parts of reducing iron salt.
The preparation method of the nickel-contaminated soil remediation agent comprises the following steps: mixing 15-35 parts by weight of nickel modifier, 30-60 parts by weight of reducing sulfide and 20-40 parts by weight of reducing iron salt, and grinding to obtain the nickel contaminated soil remediation agent.
The use method of the nickel-contaminated soil remediation agent comprises the following steps: and (2) fully and uniformly mixing the nickel-polluted soil remediation agent and the nickel-polluted soil through a 0.5-2 mm sieve, wherein the mass of the nickel-polluted soil remediation agent is 1-5% of that of the nickel-polluted soil, the water content is adjusted to 20-35%, and the nickel-polluted soil remediation agent is maintained for 7 days at room temperature.
Example 1
The embodiment provides a nickel-contaminated soil remediation agent and a preparation method thereof, wherein the nickel-contaminated soil remediation agent mainly comprises the following components in parts by weight: 25 parts of sodium hypochlorite, 45 parts of sodium sulfide and 30 parts of ferrous sulfate; wherein, the sodium hypochlorite, the sodium sulfide and the ferrous sulfate are analytically pure.
The preparation method comprises the following steps: mixing the sodium hypochlorite, the sodium sulfide and the ferrous sulfate according to the formula amount, and grinding to obtain the nickel-contaminated soil remediation agent.
Example 2
The embodiment provides a nickel-contaminated soil remediation agent and a preparation method thereof, wherein the nickel-contaminated soil remediation agent mainly comprises the following components in parts by weight: 25 parts of potassium hypochlorite, 45 parts of sodium sulfide and 30 parts of ferrous sulfate; wherein, the potassium hypochlorite, the sodium sulfide and the ferrous sulfate are analytically pure.
The preparation method is the same as that of example 1.
Example 3
The embodiment provides a nickel-contaminated soil remediation agent and a preparation method thereof, wherein the nickel-contaminated soil remediation agent mainly comprises the following components in parts by weight: 25 parts of barium chloride, 45 parts of sodium sulfide and 30 parts of ferrous sulfate; wherein, the barium chloride, the sodium sulfide and the ferrous sulfate are analytically pure.
The preparation method is the same as that of example 1.
Example 4
The embodiment provides a nickel-contaminated soil remediation agent and a preparation method thereof, wherein the nickel-contaminated soil remediation agent mainly comprises the following components in parts by weight: 25 parts of barium chloride, 45 parts of sodium sulfide and 30 parts of ferrous chloride; wherein, the barium chloride, the sodium sulfide and the ferrous chloride are analytically pure.
The preparation method is the same as that of example 1.
Example 5
The embodiment provides a nickel-contaminated soil remediation agent and a preparation method thereof, wherein the nickel-contaminated soil remediation agent mainly comprises the following components in parts by weight: 25 parts of a mixture of barium chloride and sodium hypochlorite (10 parts of barium chloride and 15 parts of sodium hypochlorite), 45 parts of a mixture of sodium sulfide and calcium polysulfide (25 parts of sodium sulfide and 20 parts of calcium polysulfide), and 30 parts of a mixture of ferrous sulfate, ferrous chloride and ferrous nitrate (10 parts each); wherein, the barium chloride, the sodium hypochlorite, the sodium sulfide, the calcium polysulfide, the ferrous sulfate, the ferrous chloride and the ferrous nitrate are analytically pure.
The preparation method is the same as that of example 1.
The nickel-contaminated soil remediation agent prepared in example 4 is used for remediating nickel-contaminated soil in a certain site in Chongqing. Taking 100g of a soil sample, adding a nickel-contaminated soil remediation agent in a mass ratio of 4%, adjusting the water content to 20-35%, uniformly mixing, and maintaining for 7 days; the repaired soil is leached by adopting a solid waste leaching toxicity leaching acetic acid buffer solution method (HJ/T300-2007), and the background information and the repairing experiment result of the soil are shown in Table 1.
The result shows that when the mass ratio of the nickel-contaminated soil remediation agent is 4%, the leaching concentration of nickel in the contaminated soil is greatly reduced from 7.18mg/L to 0.447mg/L, the leaching concentration is reduced by 93.8%, and the pH value of the soil before and after remediation is changed from 2.95 to 6.57.
Comparative example 1
This comparative example provides the soil remediation effect of a single nickel amendment. The nickel modifier comprises 25 parts by weight of barium chloride, and the barium chloride is analytically pure. 100g of soil sample of nickel-contaminated soil in a certain site of Chongqing is taken, 1% of barium chloride by mass is added, the using method and the leaching method are the same as those of the example 5, and the repairing result is shown in the table 1.
Comparative example 2
This comparative example provides soil remediation of a single reducing sulfide. The reducing sulfide is 45 parts by weight of sodium sulfide, and the sodium sulfide is analytically pure. 100g of soil sample of nickel-contaminated soil in a certain site of Chongqing is taken, 1.8 mass percent of sodium sulfide is added, the using method and the leaching method are the same as those of the example 5, and the repairing result is shown in the table 1.
Comparative example 3
This comparative example provides the soil remediation effect of a single reducing iron salt. The reducing ferric salt is 30 parts by weight of ferrous sulfate, and the ferrous sulfate is analytically pure. 100g of a soil sample of nickel-contaminated soil in a certain site of Chongqing is taken, 1.2 mass percent of ferrous sulfate is added, the using method and the leaching method are the same as those of the example 5, and the repairing result is shown in the table 1.
Comparative example 4
The comparative example provides the soil remediation effect after the nickel modifier and the reducing sulfide are compounded. The nickel modifier and the reducing sulfide are respectively 25 parts by weight of barium chloride and 45 parts by weight of sodium sulfide, and the barium chloride and the sodium sulfide are analytically pure. 100g of a soil sample of nickel-contaminated soil in a certain site of Chongqing was taken, 1.0 mass% of barium chloride and 1.8 mass% of sodium sulfide were added, the application method and the leaching method were the same as in example 5, and the repairing results are shown in Table 1.
Comparative example 5
The comparative example provides the soil remediation effect after the nickel modifier and the reducing ferric salt are compounded. The nickel modifier and the reductive iron salt are respectively 25 parts by weight of barium chloride and 30 parts by weight of ferrous sulfate, and the barium chloride and the ferrous sulfate are analytically pure. 100g of a soil sample of nickel-contaminated soil in a certain site of Chongqing was taken, 1.0 mass% of barium chloride and 1.2 mass% of ferrous sulfate were added, the application method and the leaching method were the same as in example 5, and the repairing results are shown in Table 1.
Comparative example 6
The comparative example provides the soil remediation effect after compounding of the reducing sulfide and the reducing iron salt. The reducing sulfide and the reducing iron salt are respectively 45 parts by weight of sodium sulfide and 30 parts by weight of ferrous sulfate, and the sodium sulfide and the ferrous sulfate are analytically pure. 100g of soil sample of nickel-contaminated soil in a certain site of Chongqing was taken, 1.8 mass% of sodium sulfide and 1.2 mass% of ferrous sulfate were added, the application method and the leaching method were the same as in example 5, and the repairing results are shown in Table 1.
Comparative example 7
The nickel-contaminated soil remediation agent used in the comparative example and the preparation method thereof are the same as those in example 4, and the application method thereof is similar to that in example 5, but the difference from example 5 is that the addition amount of the nickel-contaminated soil remediation agent accounts for 0.5% of that of the nickel-contaminated soil, and the remediation results are shown in table 1.
Comparative example 8
The nickel-contaminated soil remediation agent adopted in the comparative example and the preparation method thereof are the same as those in example 4, and the application method of the nickel-contaminated soil remediation agent used for remediation of nickel-contaminated soil in a certain field of Chongqing is similar to that in example 5, the difference from example 5 is that the water content is adjusted to 10%, and the remediation result is shown in Table 1.
TABLE 1
The nickel-contaminated soil repairing agent has the advantages of low cost, simple preparation method, short repairing period, wide application range and convenience for field application, and can obtain good repairing effect on nickel-contaminated soil after the nickel-contaminated soil repairing agent is applied for curing for 7 days, wherein when the nickel-contaminated soil repairing agent with the mass ratio of 4% is added into the nickel-contaminated soil, the leaching concentration of nickel in the original soil is greatly reduced, the reduction amplitude reaches more than 93.8%, and the leaching concentration is reduced from 7.18mg/L to 0.447 mg/L; after the nickel-contaminated soil remediation agent is added, the pH value of the soil is changed from 2.95 to 6.57 before and after remediation, and the requirement of 6-9 of the pH value is met; the nickel-contaminated soil remediation agent disclosed by the invention is nontoxic and harmless in each component, can keep the structure and acid-base balance of soil, does not influence the value of the soil, and can be continuously utilized for a long time.
The present invention is illustrated by the above-mentioned examples, but the present invention is not limited to the above-mentioned detailed process equipment and process flow, i.e. it is not meant to imply that the present invention must rely on the above-mentioned detailed process equipment and process flow to be practiced. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (6)
1. The nickel-contaminated soil remediation agent is characterized by comprising the following components in parts by weight:
15-35 parts of nickel modifier
30-60 parts of reducing sulfide
20-40 parts of a reducing iron salt;
the nickel modifier is one or a mixture of at least two of sodium hypochlorite, potassium hypochlorite and barium chloride;
the reducing sulfide is one or a mixture of at least two of sodium sulfide, potassium sulfide and calcium polysulfide;
the reducing iron salt is one or a mixture of at least two of ferrous sulfate, ferrous chloride and ferrous nitrate.
2. The nickel-contaminated soil remediation agent of claim 1, wherein said nickel-contaminated soil remediation agent comprises the following components, by weight:
20-30 parts of nickel modifier
40-50 parts of reducing sulfide
25-35 parts of reducing iron salt.
3. The nickel-contaminated soil remediation agent of claim 1, wherein said nickel-contaminated soil remediation agent comprises the following components, by weight:
25 portions of barium chloride
45 parts of sodium sulfide
30 parts of ferrous chloride.
4. A method of preparing the nickel-contaminated soil remediation agent of any one of claims 1 to 3, wherein the method of preparation comprises the steps of: and mixing the components in parts by weight, and grinding to obtain the nickel-contaminated soil remediation agent.
5. The method of using the nickel-contaminated soil remediation agent of any one of claims 1-3, wherein the nickel-contaminated soil remediation agent is applied to nickel-contaminated soil, wherein the mass of the nickel-contaminated soil remediation agent is 1-5% of the mass of the nickel-contaminated soil.
6. The use method according to claim 5, wherein the use method comprises the steps of sufficiently and uniformly mixing the nickel-contaminated soil remediation agent and the nickel-contaminated soil through a 0.5-2 mm sieve, adjusting the water content to 20-35%, and maintaining for 7 days at room temperature to restore the nickel-contaminated soil.
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| CN110079323A (en) * | 2019-04-30 | 2019-08-02 | 湖南省和清环境科技有限公司 | A kind of arsenic, nickel combined pollution place soil remediation stabilizer and its processing method |
| CN112058901B (en) * | 2020-09-16 | 2021-12-10 | 北京高能时代环境技术股份有限公司 | Remediation method and remediation agent for complex nickel-contaminated soil |
| CN112961679A (en) * | 2021-02-01 | 2021-06-15 | 博天环境集团股份有限公司 | Repairing agent and method for stably repairing mercury-polluted soil by adopting same |
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| US6492572B2 (en) * | 1995-08-29 | 2002-12-10 | E. I. Du Pont De Nemours And Company | Method for remediating contaminated soils |
| CA2908548A1 (en) * | 2014-10-17 | 2016-04-17 | Redox Technology Group, Llc | Method for treating soil and groundwater containing heavy metals including nickel |
| CN107446587B (en) * | 2017-07-24 | 2021-01-08 | 湖南新九方科技有限公司 | Preparation method and application of heavy metal contaminated soil/bottom mud stabilizer |
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