CN109554180B - Heavy metal contaminated soil remediation agent and remediation method - Google Patents
Heavy metal contaminated soil remediation agent and remediation method Download PDFInfo
- Publication number
- CN109554180B CN109554180B CN201811443821.7A CN201811443821A CN109554180B CN 109554180 B CN109554180 B CN 109554180B CN 201811443821 A CN201811443821 A CN 201811443821A CN 109554180 B CN109554180 B CN 109554180B
- Authority
- CN
- China
- Prior art keywords
- based compound
- heavy metal
- contaminated soil
- metal contaminated
- iron
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- C09K17/06—Calcium compounds, e.g. lime
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention belongs to the field of soil remediation, and particularly discloses a heavy metal contaminated soil remediation agent which mainly comprises the following components in parts by weight: 5-10 parts of load type iron-based compound, 20-50 parts of calcium-based compound and 50-75 parts of silicate-based compound; the invention relates to a novel supported ferricide compound; the high-efficiency adsorption of harmful heavy metals is realized, and the remediation and fixation of the heavy metal contaminated soil are further realized through the composite curing of the calcium-based compound and the silicate-based compound. Meanwhile, the invention also discloses a method for repairing heavy metal contaminated soil, which has the characteristics of small addition amount of a soil repairing agent, high treatment efficiency, high efficiency, long stabilization effect on the heavy metal contaminated soil and low cost.
Description
Technical Field
The invention belongs to the technical field of soil remediation and treatment, and particularly relates to a heavy metal contaminated soil remediation agent and a remediation method.
Background
The heavy metal pollution of the soil is that the content of trace harmful elements in the soil exceeds a background value and is too high due to excessive deposition. The heavy metals in the polluted soil mainly comprise elements with obvious biological toxicity, such As mercury (Hg), cadmium (Cd), lead (Pb), chromium (Cr), metalloid arsenic (As) and the like, and elements with certain toxicity, such As zinc (Zn), copper (Cu), nickel (Ni) and the like. In recent years, the rapid development of non-ferrous smelting, electroplating, chemical industry, printing and dyeing and other industries causes the pollution of copper and zinc to soil, and the threat to the ecological environment and the human health is increasingly serious.
The copper-zinc heavy metal hydroxide in the copper-zinc polluted soil is in an unstable state, if the copper-zinc heavy metal hydroxide is not treated and disposed in time, heavy metal is likely to be dissolved out again under the leaching action of rainwater to pollute underground water, so that environmental ecology is harmed, and the heavy metal polluted soil is generally hazardous waste. Therefore, the remediation, solidification and solidification of the copper-nickel-copper-zinc polluted industrial soil are not slow.
Disclosure of Invention
The invention aims to solve the technical problem of providing a heavy metal contaminated soil remediation agent which can efficiently remediate and stabilize heavy metal contaminated soil for a long time, and has good remediation effect and low cost.
Correspondingly, the invention also provides a method for repairing the heavy metal contaminated soil, which has the advantages of high repairing efficiency, less repairing dosage and low repairing cost.
In order to solve the technical problem, the invention provides a heavy metal contaminated soil remediation agent which mainly comprises the following components in parts by weight: 5-10 parts of load type iron-based compound, 20-50 parts of calcium-based compound and 50-100 parts of silicate-based compound;
the preparation method of the supported iron-based compound comprises the following steps:
(1) dissolving an iron reagent into a solvent to obtain a solution;
(2) adding a load base into the dissolving solution; uniformly mixing to obtain a mixed solution;
(3) adding 0.1-0.5mol/L sodium borohydride or potassium borohydride solution into the mixed solution at a preset speed, and stirring for reaction for 1-2 hours; obtaining a reduction product;
(4) washing the reduction product and drying under vacuum condition;
(5) burning the dried reduction product at 600-800 ℃ for 0.2-1h to obtain a finished product of the load type iron-based compound;
wherein the load base is one of attapulgite, modified fiber and modified bentonite;
the weight ratio of the load base to the iron reagent is (90-100): (0.1-1).
As an improvement of the technical scheme, the calcium-based compound is one or a combination of calcium oxide, calcium hydroxide and calcium carbonate.
As an improvement of the technical scheme, the silicate-based compound is selected from one or a combination of portland cement, bentonite and diatomite.
As an improvement of the technical scheme, the silicate-based compound is portland cement, the calcium-based compound is calcium oxide, and the supported iron-based compound is attapulgite supported nano zero-valent iron.
As an improvement of the technical scheme, the heavy metal is one or a combination of copper, zinc, chromium, arsenic, nickel, lead, cadmium and mercury.
As an improvement of the technical scheme, the heavy metal is copper and zinc; in the heavy metal contaminated soil, the content of copper is 517-1440 mg/kg and the content of zinc is 517-2970 mg/kg.
As an improvement of the technical scheme, the step (1) comprises the following steps:
(1.1) dissolving an iron reagent into a solvent;
(1.2) adding alkali liquor, and adjusting the pH value to be more than 6.5 to obtain a dissolved solution;
wherein the iron reagent is one or a combination of ferrous sulfate, ferrous chloride, ferric sulfate and ferric chloride;
the reagent is a mixed solution of water and ethanol; wherein the volume ratio of water to ethanol is (50-70): (40-50).
As an improvement of the technical scheme, in the step (2), after a load group is added, nitrogen is introduced to remove dissolved oxygen in the dissolving solution;
in the step (3), the preset speed is 1 drop/second;
in the step (4), the reduction product is washed by using oxygen-free water, ethanol and acetone in sequence; after the cleaning is finished, the cleaning system is neutral;
the oxygen-free water is obtained by washing deionized water with nitrogen.
Correspondingly, the invention also discloses a heavy metal contaminated soil remediation method, which comprises the following steps:
firstly, preparing a supported iron-based compound;
secondly, uniformly mixing the soil remediation agent with heavy metal contaminated soil; wherein the weight ratio of the soil remediation agent to the heavy metal contaminated soil is as follows: (5-20): (80-100);
thirdly, backfilling and curing the cured product for 2 to 5 days, and sealing the product.
As an improvement of the technical scheme, in the step two, the soil remediation agent is added in the following sequence: firstly, adding a supported iron-based compound; then adding a calcium-based compound and a silicate-based compound;
in the third step, the heavy metal elution amount is less than or equal to 1mg/L after the repair and solidification.
The invention provides a heavy metal contaminated soil remediation agent, which is prepared from a load type iron-based compound, a calcium-based compound and a silicate-based compound, and has the following beneficial effects:
1. the invention adopts a load type iron-based compound, a calcium-based compound and a silicate-based compound as main components of the soil remediation agent; the iron-based compound has strong reducibility and adsorbability, and can quickly absorb heavy metals, so that the toxicity of the heavy metals is reduced; the calcium-based compound can precipitate heavy metal in the form of hydroxide, and the calcium-based compound wraps harmful heavy metal through precipitation; the heavy metal precipitate is adsorbed by the iron-based compound, so that the heavy metal is well solidified, and the heavy metal dissolution rate is greatly reduced; the silicate base can further fix the loaded iron-based compound for adsorbing the heavy metal and the hydroxide precipitate of the heavy metal, and the heavy metal dissolution rate is reduced. The combination of the three can effectively solidify various heavy metals.
2. According to the invention, the repairing effect is effectively improved through a reasonable formula of the soil repairing agent; after the soil remediation agent and the soil remediation method are used for remediation, the elution amount of heavy metals in the polluted soil is less than or equal to 1mg/L, and the soil remediation agent meets the III-class standard of underground water quality standard (GB/T14848-2017).
3. In the soil remediation method, the addition amount of the soil remediation agent is small, the treatment efficiency is high, the soil polluted by heavy metals has the effects of high efficiency, long-term remediation and stabilization, and the cost is low.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below.
The invention discloses a heavy metal contaminated soil remediation agent, which mainly comprises the following components in parts by weight: 5-10 parts of load type iron-based compound, 20-50 parts of calcium-based compound and 50-100 parts of silicate-based compound;
the existing soil repairing agents mostly adopt alkaline calcium-based compounds and heavy metal ions to form hydroxides, and then adopt silicate-based compounds to carry out curing; however, hydroxides of some heavy metal elements are unstable and may be harmful after dissolution into groundwater. Therefore, the invention improves the prior soil remediation agent.
The invention adopts a load type iron-based compound, a calcium-based compound and a silicate-based compound as main components of the soil remediation agent; the iron-based compound has strong reducibility and adsorbability, and can quickly absorb heavy metals, so that the toxicity of the heavy metals is reduced; the calcium-based compound is beneficial to the precipitation of harmful heavy metals in the form of hydroxides, and the calcium-based compound wraps the harmful heavy metals through precipitation; the heavy metal precipitate is adsorbed by the iron-based compound, so that the heavy metal is well solidified, and the heavy metal dissolution rate is greatly reduced; the silicate base can further fix the loaded iron-based compound for adsorbing the heavy metal and the hydroxide precipitate of the heavy metal, and the heavy metal dissolution rate is reduced. The combination of the three can effectively solidify various heavy metals; meanwhile, the soil remediation agent has good effect and reduces the using amount.
The preparation method of the supported iron-based compound comprises the following steps:
(1) dissolving an iron reagent into a solvent to obtain a solution;
(2) adding a load base into the dissolving solution; uniformly mixing to obtain a mixed solution;
(3) adding 0.1-0.5mol/L sodium borohydride or potassium borohydride solution into the mixed solution at a preset speed, and stirring for reaction for 1-2 hours; obtaining a reduction product;
(4) washing the reduction product and drying under vacuum condition;
(5) burning the dried reduction product at 600-800 ℃ for 0.2-1h to obtain a finished product of the load type iron-based compound;
wherein the load base is one of attapulgite, modified fiber and modified bentonite; preferably attapulgite.
The nano zero-valent iron is prepared by a liquid-phase precipitation method, and substances with extremely high specific surface area, such as attapulgite, modified fiber, modified bentonite and the like, are used as a load base; forming the supported nano zero-valent iron with extremely high specific surface area and reducibility; can effectively adsorb heavy metals and heavy metal hydroxide sediment, effectively promote soil remediation effect. Meanwhile, the invention adopts the load base with larger specific surface area, such as attapulgite, and the like, thereby reducing the usage amount of iron and effectively reducing the cost of the soil remediation agent.
Wherein the weight ratio of the load base to the iron reagent is (90-100): (0.1-1); preferably, the loading base: the iron reagent is 100:0.1-0.5, the use amount of the iron reagent is effectively reduced through reasonable selection of the load base and optimization of the preparation method, and the cost of the soil remediation agent is reduced.
Wherein, step (1) includes:
(1.1) dissolving an iron reagent into a solvent;
(1.2) adding alkali liquor, and adjusting the pH value to be more than 6.5 to obtain a dissolved solution;
wherein the iron reagent is one or a combination of ferrous sulfate, ferrous chloride, ferric sulfate and ferric chloride;
the reagent is a mixed solution of water and ethanol; wherein the volume ratio of water to ethanol is (50-70): (40-50); preferably (60-70): (40-50); the addition of ethanol can promote the dispersion of the reducing agent (sodium borohydride/potassium borohydride) and the reduction effect of the iron reagent.
In the step (2), adding a load group and introducing nitrogen to remove dissolved oxygen in the solution; removal of dissolved oxygen can enhance the reduction of iron reagents; the reducibility of the load type iron-based compound is improved;
in the step (3), the preset speed is 1 drop/second, and the reducing agent (sodium borohydride/potassium borohydride) is dropped at a slower speed to fully exert the reducing effect; meanwhile, the method is also beneficial to generating nanoscale zero-valent iron.
In the step (4), cleaning the reduction product by using oxygen-free water, ethanol and acetone in sequence; after the cleaning is finished, the cleaning system is neutral, namely the pH value is between 6.5 and 8; preferably, the cleaning steps are as follows: cleaning with oxygen-free water for 1 time, cleaning with excessive ethanol for 1 time, and cleaning with acetone for at least 3 times; the washing was stopped after the pH of the washing system was made neutral. The organic reagent ethanol and acetone are adopted for cleaning for multiple times, so that residual reducing agent, solvent and the like attached to the porous matrix can be effectively removed, and the purity of the supported iron-based compound is improved. Wherein the oxygen-free water is obtained by washing deionized water with nitrogen.
And after the washing is finished, drying under a vacuum condition, wherein the drying under the vacuum condition is favorable for ensuring the reducibility of the load type iron-based compound.
In the step (5), the reduction product is burned at 600-800 ℃ for 0.2-1h, preferably at 650-720 ℃, and more preferably at 700 ℃; the burning time is 0.2 to 1 hour, preferably 0.2 to 0.6 hour, and more preferably 0.5 hour. Preferably, the firing is performed in a nitrogen atmosphere. The firing function is to remove the water in the attapulgite, increase the specific surface area and finally enhance the adsorption capacity of the pore channel.
In order to further improve the effect of the soil remediation agent, various substances in the invention need to be selected;
preferably, in the soil remediation agent formulation of the present invention, the calcium-based compound is selected from one or a combination of calcium oxide, calcium hydroxide, calcium carbonate; the calcium-based compounds have alkalescence, can effectively play a role and are easy to obtain; further preferably, the calcium-based compound is calcium oxide, and the cost is low. The added weight portion of the calcium-based compound is 20-50 portions; preferably 20 to 40 parts, and more preferably 25 to 40 parts.
Preferably, in the formula of the soil remediation agent, the silicate-based compound is selected from one or a combination of portland cement, bentonite and diatomite; further preferably, the silicate-based compound is selected from acid salt cement, and the silicate cement is 42.5R-type ordinary cement; the common cement has good curing effect, small particle size and strong adsorption curing effect. The silicate-based compound is added in an amount of 50 to 100 parts by weight, preferably 50 to 90 parts by weight, more preferably 50 to 75 parts by weight, and still more preferably 60 to 75 parts by weight.
Preferably, the formula of the soil remediation agent is as follows: 5-9 parts of attapulgite loaded nano zero-valent iron, 20-50 parts of calcium oxide and 50-100 parts of cement.
The soil remediation agent can be suitable for remediation of various heavy metal contaminated soil; such as heavy metal polluted soil of copper, zinc, chromium, arsenic, nickel, lead, cadmium, mercury and the like, preferably, the soil remediation agent is particularly suitable for the soil polluted by copper and zinc; the content of copper in the soil to be repaired is 517-2970mg/kg, and the content of zinc in the soil to be repaired is 803-1440 mg/kg.
Correspondingly, the invention also discloses a method for restoring the heavy metal contaminated soil, which comprises the following steps:
firstly, preparing a supported iron-based compound;
secondly, uniformly mixing the soil remediation agent with heavy metal contaminated soil; wherein the weight ratio of the soil remediation agent to the heavy metal contaminated soil is (5-20): (80-100);
preferably, the adding sequence of the repairing agent is as follows: firstly, adding a supported iron-based compound; then adding a calcium-based compound and a silicate-based compound;
the soil repairing agent has good effect and low addition amount.
Thirdly, backfilling and curing the cured product for 2 to 5 days, and sealing the product.
Preferably, after the restoration and solidification, the heavy metal elution amount is less than or equal to 1 mg/L.
The invention is further illustrated by the following specific examples:
example 1
Formulation of
5 parts of load type iron-based compound, 20 parts of calcium-based compound and 50 parts of silicate-based compound;
wherein the supported iron-based compound is modified fiber supported nano zero-valent iron, the calcium-based compound is calcium carbonate, and the silicate-based compound is diatomite;
the preparation method of the supported iron-based compound comprises the following steps:
(1) dissolving an iron reagent into a solvent to obtain a solution;
(2) adding a load base into the dissolving solution; uniformly mixing to obtain a mixed solution;
(3) adding 0.1mol/L sodium borohydride solution into the mixed solution at a preset speed, and stirring for reaction for 1 hour; obtaining a reduction product;
(4) washing the reduction product and drying under vacuum condition;
(5) burning the dried reduction product at 600 ℃ for 0.2h to obtain a finished product of the load type iron-based compound;
wherein the load base is modified fiber, the iron-containing reagent is ferric sulfate, and the solvent is water;
the weight ratio of the load base to the iron reagent is 100: 0.1.
repair method
Firstly, preparing a supported iron-based compound;
secondly, uniformly mixing the soil remediation agent with heavy metal contaminated soil;
wherein the heavy metal contaminated soil is copper-zinc contaminated soil, and before treatment, the copper content is 1037mg/kg, and the zinc content is 803 mg/kg;
wherein the weight ratio of the soil remediation agent to the heavy metal contaminated soil is 5: 100, respectively;
and thirdly, backfilling and curing after repairing and curing for 2 days, and sealing and storing.
Example 2
Formulation of
10 parts of load type iron-based compound, 50 parts of calcium-based compound and 100 parts of silicate-based compound;
wherein the supported iron-based compound is modified bentonite supported nano zero-valent iron, the calcium-based compound is calcium hydroxide, and the silicate-based compound is diatomite;
the preparation method of the supported iron-based compound comprises the following steps:
(1) dissolving an iron reagent into a solvent to obtain a solution;
(2) adding a load base into the dissolving solution; uniformly mixing to obtain a mixed solution;
(3) adding 0.5mol/L potassium borohydride solution into the mixed solution at a preset speed, and stirring for reaction for 2 hours; obtaining a reduction product;
(4) washing the reduction product and drying under vacuum condition;
(5) burning the dried reduction product at 800 ℃ for 1h to obtain a finished product of the load type iron-based compound;
the load base is modified fiber, the iron-containing reagent is ferric sulfate, and the solvent is a mixed solution of water and alcohol;
the weight ratio of the load base to the iron reagent is 90: 1.
repair method
Firstly, preparing a supported iron-based compound;
secondly, uniformly mixing the soil remediation agent with heavy metal contaminated soil;
wherein the heavy metal contaminated soil is copper-zinc contaminated soil, and before treatment, the copper content is 1037mg/kg, and the zinc content is 803 mg/kg;
wherein the weight ratio of the soil remediation agent to the heavy metal contaminated soil is 20: 80;
and thirdly, backfilling and curing after repairing and curing for 5 days, and sealing and storing.
Example 3
Formulation of
5 parts of load type iron-based compound, 20 parts of calcium-based compound and 75 parts of silicate-based compound;
wherein the load type iron-based compound is attapulgite load type nano zero-valent iron, the calcium-based compound is calcium oxide, and the silicate-based compound is cement;
the preparation method of the supported iron-based compound comprises the following steps:
(1) dissolving ferrous sulfate into a mixed solution of water and alcohol (the volume ratio of water to alcohol is 50; 50) to obtain a dissolved solution;
(2) adding attapulgite into the dissolved solution; uniformly mixing to obtain a mixed solution;
(3) adding 0.3mol/L sodium borohydride solution into the mixed solution at the speed of 1 drop/second, and stirring for reaction for 1.2 hours; obtaining a reduction product;
(4) cleaning the reduction product by using oxygen-free water, excessive ethanol and acetone at one time, wherein the pH value of a cleaning agent system is 7 after the cleaning is finished; and drying under vacuum condition;
(5) burning the dried reduction product at 700 ℃ for 0.5h to obtain a finished product of the load type iron-based compound;
the weight ratio of the load base to the iron reagent is 100: 0.5.
repair method
Firstly, preparing a supported iron-based compound;
secondly, uniformly mixing the soil remediation agent with heavy metal contaminated soil;
wherein the heavy metal contaminated soil is copper-zinc contaminated soil, and the copper content is 2970mg/kg and the zinc content is 1440mg/kg before treatment;
wherein the weight ratio of the soil remediation agent to the heavy metal contaminated soil is 10: 90, respectively;
and thirdly, backfilling and curing after repairing and curing for 3 days, and sealing and storing.
Example 4
Formulation of
8 parts of load type iron-based compound, 20 parts of calcium-based compound and 70 parts of silicate-based compound;
the preparation method and the repair method of the supported iron-based compound are the same as those in example 3.
Example 5
The formula of the soil remediation agent is the same as that of example 4;
the soil remediation method was the same as in example 4;
the preparation method of the supported iron-based compound comprises the following steps:
the preparation method of the supported iron-based compound comprises the following steps:
(1) dissolving ferrous sulfate into a mixed solution of water and alcohol (the volume ratio of water to alcohol is 60; 40) to obtain a dissolved solution;
(2) adding attapulgite into the dissolved solution; uniformly mixing to obtain a mixed solution;
(3) adding 0.45mol/L sodium borohydride solution into the mixed solution at the speed of 1 drop/second, and stirring for reaction for 1.2 hours; obtaining a reduction product;
(4) cleaning the reduction product by using oxygen-free water, excessive ethanol and acetone at one time, wherein the pH value of a cleaning agent system is 7.5 after the cleaning is finished; and drying under vacuum condition;
(5) burning the dried reduction product at 750 ℃ for 1h to obtain a finished product of the load type iron-based compound;
the weight ratio of the load base to the iron reagent is 100: 0.5.
comparative example 1
Repairing agent formula
20 parts of fly ash, 20 parts of calcium oxide and 70 parts of cement;
the repair method was the same as in example 5.
Collecting and detecting soil after maintenance is completed, wherein the detection results are as follows:
| example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Comparative example 1 | |
| Copper content (mg/kg) | 0.685 | 0.425 | 0.624 | 0.597 | 0.389 | 1.55 |
| Zinc content (mg/kg) | 0.785 | 0.582 | 0.715 | 0.768 | 0.476 | 2.32 |
As can be seen from the table, the heavy metal leaching rate of the soil treated by the remediation method is low, and the soil meets the III-class standard of underground water quality standard (GB/T14848-2017).
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (8)
1. The heavy metal contaminated soil remediation agent is characterized by comprising the following raw materials in parts by weight:
5-10 parts of load type iron-based compound, 20-50 parts of calcium-based compound and 50-75 parts of silicate-based compound;
wherein, the calcium-based compound is selected from one or a combination of calcium oxide, calcium hydroxide and calcium carbonate, and the silicate-based compound is selected from one or a combination of portland cement, bentonite and diatomite;
the preparation method of the supported iron-based compound comprises the following steps:
(1) dissolving an iron reagent into a solvent to obtain a solution;
(2) adding a load base into the dissolving solution; uniformly mixing to obtain a mixed solution;
(3) adding 0.1-0.5mol/L sodium borohydride or potassium borohydride solution into the mixed solution at a preset speed, and stirring for reaction for 1-2 hours; obtaining a reduction product;
(4) cleaning the reduction product by using oxygen-free water, ethanol and acetone in sequence, and drying under a vacuum condition;
(5) burning the dried reduction product at 600-800 ℃ for 0.2-1h to obtain a finished product of the load type iron-based compound;
wherein the iron reagent is one or a combination of ferrous sulfate, ferrous chloride, ferric sulfate and ferric chloride, and the load base is one of attapulgite, modified fiber and modified bentonite; the weight ratio of the load base to the iron reagent is (90-100): (0.1-1);
in the step (4), after the cleaning is finished, the cleaning system is neutral; the oxygen-free water is obtained by washing deionized water with nitrogen.
2. The heavy metal contaminated soil remediation agent of claim 1 wherein said silicate-based compound is portland cement, said calcium-based compound is calcium oxide, and said supported iron-based compound is attapulgite-supported nano zero-valent iron.
3. The heavy metal contaminated soil remediation agent of claim 1 wherein said heavy metal is one or a combination of copper, zinc, chromium, arsenic, nickel, lead, cadmium, mercury.
4. The heavy metal contaminated soil remediation agent of claim 1 wherein said heavy metals are copper and zinc; in the heavy metal contaminated soil, the content of copper is 517-1440 mg/kg and the content of zinc is 517-2970 mg/kg.
5. The heavy metal contaminated soil remediation agent of claim 1, wherein step (1) comprises:
(1.1) dissolving an iron reagent into a solvent;
(1.2) adding alkali liquor, and adjusting the pH to be more than 6.5 to obtain a dissolved solution;
the solvent is a mixed solution of water and ethanol; wherein the volume ratio of water to ethanol is (50-70): (40-50).
6. The heavy metal contaminated soil remediation agent of claim 1, wherein,
in the step (2), adding a load group and introducing nitrogen to remove dissolved oxygen in the solution;
in the step (3), the preset speed is 1 drop/second.
7. The heavy metal contaminated soil remediation method is characterized by comprising the following steps:
firstly, preparing a supported iron-based compound;
secondly, uniformly mixing the heavy metal contaminated soil remediation agent of claim 1 with heavy metal contaminated soil; wherein the weight ratio of the heavy metal contaminated soil remediation agent to the heavy metal contaminated soil is (5-20): (80-100);
thirdly, backfilling and curing for 2-5 days after repairing and curing, and sealing and storing.
8. The method for remediating heavy metal contaminated soil as recited in claim 7, wherein in the second step, the heavy metal contaminated soil remediation agent is added in the following order: firstly, adding a supported iron-based compound; then adding a calcium-based compound and a silicate-based compound;
in the third step, the heavy metal elution amount is less than or equal to 1mg/L after the repair and solidification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811443821.7A CN109554180B (en) | 2018-11-29 | 2018-11-29 | Heavy metal contaminated soil remediation agent and remediation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811443821.7A CN109554180B (en) | 2018-11-29 | 2018-11-29 | Heavy metal contaminated soil remediation agent and remediation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109554180A CN109554180A (en) | 2019-04-02 |
| CN109554180B true CN109554180B (en) | 2021-02-09 |
Family
ID=65868141
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811443821.7A Active CN109554180B (en) | 2018-11-29 | 2018-11-29 | Heavy metal contaminated soil remediation agent and remediation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109554180B (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110079325A (en) * | 2019-04-12 | 2019-08-02 | 中节能大地环境修复有限公司 | It is a kind of for arsenic, the composite drug and restorative procedure of nickel combined contamination soil |
| 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 |
| CN110343528B (en) * | 2019-07-12 | 2021-03-23 | 河南省明创环境科技有限公司 | Agent for restoring chromium-contaminated soil by using filling principle and method for restoring chromium-contaminated soil by using filling principle |
| CN111019663A (en) * | 2019-12-24 | 2020-04-17 | 甘肃瀚兴环保科技有限公司 | Heavy metal passivation material of nano zero-valent iron composite attapulgite, preparation method and application thereof |
| CN111019664A (en) * | 2019-12-26 | 2020-04-17 | 甘肃瀚兴环保科技有限公司 | Method for preparing soil heavy metal passivation material by using palygorskite loaded with nano zero-valent iron |
| CN111676023B (en) * | 2020-05-27 | 2021-05-25 | 永清环保股份有限公司 | Semi-wrapping stabilizing material and preparation method and use method thereof |
| CN111617768A (en) * | 2020-05-29 | 2020-09-04 | 上海华阜科技发展有限公司 | Solid waste catalyst and preparation method thereof |
| CN111718719B (en) * | 2020-06-23 | 2021-08-24 | 中南大学 | Vulcanized nano zero-valent iron-acid activated montmorillonite composite material and preparation method and application thereof |
| CN112845563A (en) * | 2020-12-18 | 2021-05-28 | 安徽理工大学环境友好材料与职业健康研究院(芜湖) | Modified fly ash and preparation method and application thereof |
| CN113058978B (en) * | 2021-03-26 | 2022-02-15 | 深圳金普迈生物科技有限公司 | Production process of heavy metal mediated biochar compound solidified by silicate |
| CN115636462A (en) * | 2022-10-21 | 2023-01-24 | 成都理工大学 | Method for synthesizing composite material with reduction and adsorption effects on mercury |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102766465A (en) * | 2012-07-31 | 2012-11-07 | 湖南永清环境修复有限公司 | Ion mineralization stabilizer for treating soil with heavy metal pollution and application method thereof |
| CN104226678B (en) * | 2014-09-05 | 2016-08-24 | 周昱 | A kind of heavy-metal contaminated soil restorative procedure and equipment thereof |
| CN104893731A (en) * | 2015-05-27 | 2015-09-09 | 成都易创思生物科技有限公司 | Biologic additive |
| CN105802631B (en) * | 2016-04-29 | 2020-10-02 | 航天凯天环保科技股份有限公司 | Transition state iron-based heavy metal immobilized reagent and preparation method thereof |
| CN108372202A (en) * | 2018-04-03 | 2018-08-07 | 格丰科技材料有限公司 | A method of the reparation medicament for administering heavy-metal contaminated soil and its improvement heavy-metal contaminated soil |
-
2018
- 2018-11-29 CN CN201811443821.7A patent/CN109554180B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN109554180A (en) | 2019-04-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109554180B (en) | Heavy metal contaminated soil remediation agent and remediation method | |
| CN107639107B (en) | A kind of restorative procedure that can reduce heavy metal in soil total amount | |
| CN111718719B (en) | Vulcanized nano zero-valent iron-acid activated montmorillonite composite material and preparation method and application thereof | |
| CN107596613B (en) | Method for stabilizing and solidifying heavy metal ions in incineration fly ash | |
| CN108311117B (en) | Magnetic biochar material for heavy metal wastewater treatment and preparation method thereof | |
| CN109589952B (en) | Preparation method and application of episulfide-modified activated carbon | |
| CN103880113B (en) | Method for circularly treating heavy metal ion wastewater by using modified fly ash | |
| CN102580743B (en) | Method for preparing oxidation catalyst from gold ore tailing slag, and prepared oxidation catalyst and application thereof | |
| CN101797496A (en) | Preparation method of inorganic-organic compound-type adsorbent based on clinoptilolite and application for removing Cr(VI) in industrial waste water | |
| Wu et al. | Removal and recovery of heavy metals from soil with sodium alginate coated FeSSi nanocomposites in a leaching process | |
| CN105107471A (en) | Sulphydryl lignocellulose/montmorillonite composite heavy metal ion adsorbent and preparation and application thereof | |
| CN110484276B (en) | Method and reagent for repairing chromium-contaminated soil by coupling nano iron-based composite material with hexavalent chromium reducing bacteria | |
| CN104774619A (en) | Immobilizing and stabilizing agent for arsenic-contaminated soil and application thereof | |
| CN113979527A (en) | Method for synchronously and efficiently removing hexavalent chromium and trichloroethylene combined pollution | |
| CN109202096B (en) | Zero-valent iron ceramsite and preparation method thereof | |
| CN114247426B (en) | Biochar-loaded natural iron-containing mineral magnetic adsorbent and preparation method and application thereof | |
| CN111905702A (en) | Preparation method of porous particle filter material loaded with nano zero-valent iron for adsorbing and removing heavy metals in water | |
| CN101786687B (en) | Adsorption and hot solution desorption method for heavy-metal acid waste water treatment and recovery | |
| CN109231480A (en) | The preparation method of fly ash base sewage-treating agent | |
| CN111715195A (en) | Copper slag polyaniline magnetic composite adsorbent and preparation method thereof | |
| CN112427019A (en) | Anaerobic granular sludge loaded vulcanized nano zero-valent iron adsorbing material and preparation method and application thereof | |
| CN114316994B (en) | Heavy metal restoration agent and preparation method and application thereof | |
| CN110302744A (en) | A kind of Metallurgical Waste Water magnetic nanometer adsorbent and preparation method thereof | |
| CN115178228A (en) | Fe-Mn @ PDA @ ASEP composite material and preparation method and application thereof | |
| CN113245358A (en) | EDTA-microorganism leaching combined soil remediation method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |