CN109097060A - Cr VI repairs medicament and its application and application method - Google Patents
Cr VI repairs medicament and its application and application method Download PDFInfo
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- CN109097060A CN109097060A CN201810838913.9A CN201810838913A CN109097060A CN 109097060 A CN109097060 A CN 109097060A CN 201810838913 A CN201810838913 A CN 201810838913A CN 109097060 A CN109097060 A CN 109097060A
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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
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/10—Reclamation of contaminated soil microbiologically, biologically or by using enzymes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/10—Reclamation of contaminated soil microbiologically, biologically or by using enzymes
- B09C1/105—Reclamation of contaminated soil microbiologically, biologically or by using enzymes using fungi or plants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
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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 kind of Cr VIs to repair medicament and its application and application method, belongs to contaminated soil remediation technical field.The present invention provides a kind of Cr VIs to repair medicament, the reparation medicament is mainly made of chemical reducing agent, biological reductant and biomass stabilizer, wherein, chemical reducing agent is the 1-5% of soil weight, biological reductant is the 2-5% of soil weight, and biomass stabilizer is the 2-5% of soil weight.The medicament reduction efficiency is high, repairing effect is steady in a long-term, compounding is at low cost, is a kind of reparation medicament can to Cr VI with long-acting stabilization.The present invention also provides the application methods of the repairing hexavalent chromium polluted soil of reparation medicament, creatively chemical reducing agent and biological reductant, biomass stabilizer are used in combination, pass through the neutralization of acid with base of medicament itself and the buffer capacity to acid and alkali of soil system, the pH of soil is maintained within the scope of neutrality to meta-alkalescence, acid-base accommodation medicament is saved.
Description
Technical field
The invention belongs to contaminated soil remediation technical fields, and in particular to a kind of Cr VI is repaired medicament and its application and made
Use method.
Background technique
Chromium in soil mainly exists in the form of trivalent and sexavalence, and trivalent chromium is microelement necessary to humans and animals,
And the strong toxicity of Cr VI, it is easily absorbed by the body, and can accumulate in vivo, there is carcinogenic, mutagenic toxicity, Cr VI is
It is listed in 129 kinds of generally acknowledged priority pollutants of one of maximum eight kinds of chemical substances of harm to the human body and Environmental Protection in America tissue
One of.Trivalent chromium is mainly attached in soil constitution in the form of hydroxide, not easy to migrate；And Cr VI is mainly with anion
Form be present in soil, and activity with higher is easier to be migrated in soil and its pore water.Therefore chromium is repaired
The key of contaminated soil is hexavalent chrome reduction to be trivalent chromium.
The method of existing hexavalent chromium polluted soil remediation has very much, mainly have chemical leaching method, biological restoration, solidification/
Stabilizing method and chemical reduction method.Wherein, chemical leaching method can practical application be limited in scope, it is desirable that chemical leaching can be with
Cr VI in soil comes into full contact with and is eluted, and the method water consumption is big, is only applicable to the big soil of the infiltration coefficients such as sandy loam,
And the eluent after eluting must be dealt carefully with, and just be avoided that secondary pollution.Biological restoration include microorganism remediation with
Two kinds of phytoremediation, microorganism remediation refers to the biochemical action using microorganism in the soil, is by hexavalent chrome reduction in soil
Trivalent chromium, and trivalent chromium is stablized in the soil, there is still a need for a large amount of basic research work for microorganism remediation technology at present, and
Requirement of this method to environmental conditions such as temperature, the pH in place is more harsh.Phytoremediation technology includes plant extract technology, plants
Object technique for fixing and phytovolatilization technology, the method repairing efficiency are long, it is difficult to realize quick reparation in a short time, and to pollution level
Big soil there are problems that being difficult to repair.Curing/stabilizing method does not change the form of Cr VI fundamentally.Chemical reduction method
It is a kind of method for effectively administering hexavalent chromium polluted soil, which, will usually with chemical reducing agents such as ferrous salts for basic medicament
Hexavalent chrome reduction is trivalent chromium, and the repairing efficiency of this method soil is short, effect is obvious, can be with large-scale application.
However, the chromium of various forms can mutually convert under certain condition in soil, and especially under oxidative conditions, trivalent
Chromium can be partially converted into Cr VI.Therefore, can the trivalent chromium after reduction be stable in soil, and keep not long-term natural
Under the conditions of be oxidized to Cr VI, be the key that repairing hexavalent chromium polluted soil.
Currently used Cr VI repair medicament mainly have iron series object series medicament (such as ferrous sulfate, ferrous sulfide) and
Sulphur system object series medicament (such as calcium polysulfide, vulcanized sodium, sodium pyrosulfite).The principle of these medicaments is supplied by providing electronics
Body promotes deliquescent hexavalent chrome reduction at trivalent chromium, then by adjusting soil pH, the form absorption for making trivalent chromium to precipitate
Onto soil particle, to remove the content of the higher Cr VI of dissolubility.Use these chemical agents as reparation medicine merely
The excessive defect of changes of pH after application is deposited in agent, so that soil long-time stability are weaker, while being also led in soil
Sulphates content is excessively high, so that change soil physico-chemical property by a relatively large margin, in turn results in soil ecology afunction.
Therefore, it needs to seek a kind of Cr VI reparation medicament, while capable of effectively restoring Cr VI in contaminated soil, protect
Hold the stabilization of soil pH and ecological functions.
In consideration of it, the present invention is specifically proposed.
Summary of the invention
The purpose of the present invention is to provide a kind of steady in a long-term, environmental-friendly Cr VIs to repair medicament.
Another object of the present invention is to provide above-mentioned Cr VIs to repair medicament answering in repairing hexavalent chromium polluted soil
With.
The object of the invention is also to provide a kind of above-mentioned Cr VIs to repair medicament in repairing hexavalent chromium polluted soil
Application method.
According to an aspect of the present invention, a kind of Cr VI provided by the invention repairs medicament, and the reparation medicament is main
It is made of chemical reducing agent, biological reductant and biomass stabilizer, wherein chemical reducing agent is the 1-5% of soil weight, raw
Object reducing agent is the 2-5% of soil weight, and biomass stabilizer is the 2-5% of soil weight.
As further preferred technical solution, the chemical reducing agent is one of calcium polysulfide or vulcanized sodium or two
Kind；
Preferably, the biological reductant is the vegetable matter that Vitamin C content is greater than 0.1%；It is highly preferred that described
Vegetable matter of the Vitamin C content greater than 0.1% is one or both of orange peel, fragrant citrus pericarp or apple skin；
Preferably, the partial size of the biological reductant is 80-100 mesh；
Preferably, the biomass stabilizer is peat soil.
According to an aspect of the present invention, reparation medicament answering in repairing hexavalent chromium polluted soil provided by the invention
With.
According to an aspect of the present invention, the use provided by the invention for repairing medicament in repairing hexavalent chromium polluted soil
Method, comprising the following steps:
Chemical reducing agent, biological reductant and biomass stabilizer are sequentially added into soil carries out soil remediation.
As further preferred technical solution, chemical reducing agent is added into soil, water is added after mixing, is then supported
Biological reductant is added after conserving in shield.
As further preferred technical solution, the soil is the soil after broken sieving, and the sieving was 25-35 mesh
Sieve；
And/or the chemical reducing agent is the one or two of calcium polysulfide or vulcanized sodium；
And/or the chemical reducing agent is the 1-5% of soil weight；
And/or the additive amount of the water is so that soil moisture content is 25%-35%；
And/or the time of the maintenance is 36-72h.
As further preferred technical solution, biological reductant is added in the soil, water is added after mixing, is then supported
Biomass stabilizer is added after conserving in shield.
As further preferred technical solution, the biological reductant is the vegetalitas material that Vitamin C content is greater than 0.1%
Material；It is highly preferred that vegetable matter of the Vitamin C content greater than 0.1% is one in orange peel, fragrant citrus pericarp or apple skin
Kind or two kinds；
And/or the partial size of the biological reductant is 80-100 mesh；
And/or the biological reductant is the 2-5% of soil weight；
And/or the additive amount of the water is so that soil moisture content is 25%-35%；
And/or the time of the maintenance is 18-30h.
As further preferred technical solution, biomass stabilizer is added in the soil, mixes；
Preferably, the biomass stabilizer is peat soil；
And/or the biomass stabilizer is the 2-5% of soil weight.
The present invention provides a kind of Cr VIs to repair medicament, and Cr VI of the present invention repairs medicament creatively by electronation
Agent is used in combination with biological reductant, biomass stabilizer, wherein chemical reducing agent is basic agent, biological reductant and life
Substance stabilizer is natural organic acids medicament, is buffered by the neutralization of acid with base of medicament itself and the soda acid of soil system
The pH of soil is maintained within the scope of neutrality to meta-alkalescence, saves acid-base accommodation medicament by ability.And biomass stabilizer contains
Very high organic matter, humic acid and nutrition can not only provide suitable environment for microorganism, but also can be used as soil improvement
Agent restores the plantation function of soil.Biological reductant and biomass stabilizer in medicament of the present invention are green natural substance
And it is from a wealth of sources, it is simple and easy to get.
Specific embodiment
Embodiment of the present invention is described in detail below in conjunction with embodiment, but those skilled in the art will
Understand, the following example is merely to illustrate the present invention, and is not construed as limiting the scope of the invention.It is not specified in embodiment specific
Condition person carries out according to conventional conditions or manufacturer's recommended conditions.Reagents or instruments used without specified manufacturer is
The conventional products that can be obtained by commercially available purchase.
According to an aspect of the invention, there is provided a kind of Cr VI repairs medicament, the reparation medicament is mainly by chemistry
Reducing agent, biological reductant and biomass stabilizer composition, wherein chemical reducing agent is the 1-5% of soil weight, biological reducing
Agent is the 2-5% of soil weight, and biomass stabilizer is the 2-5% of soil weight.
It is creatively that chemical reducing agent and biological reductant and biomass is steady that Cr VI provided by the invention repairs medicament
Determine agent to be used in combination, wherein chemical reducing agent is basic agent, and biological reductant and biomass stabilizer are natural organic acids
Medicament is maintained the pH of soil by the neutralization of acid with base of medicament itself and the buffer capacity to acid and alkali of soil system
Within the scope of property to meta-alkalescence, acid-base accommodation medicament is saved.
In addition, the environment of neutral meta-alkali does not influence plant growth, belong to more suitable environment.
And biomass stabilizer contains very high organic matter, humic acid and nutrition, can both provide for microorganism suitable
Suitable environment, and can be used as soil conditioner, restore the plantation function of soil.Biological reductant and life in medicament of the present invention
Substance stabilizer is green natural substance and from a wealth of sources, simple and easy to get.
It can be trivalent chromium by the hexavalent chrome reduction in soil that Cr VI of the present invention, which repairs the chemical reducing agent in medicament, greatly
Width reduces the content of Cr VI in soil；Chemical reducing agent weight is the 1-5% of soil weight.Chemical reducing agent weight is soil
The typical but non-limiting ratio of weight be 1%, 1.1%, 1.2%, 1.5%, 1.8%, 2%, 2.5%, 3%, 3.5%,
4%, 4.5% or 5%.
Cr VI of the present invention repairs the biological reductant in medicament, on the one hand the soil after adjustable chemical reducing agent
On the other hand pH can further supplement the reduction effect of chemical reducing agent, thus reduce the medicament of electronation medicament at
This；Biological reductant weight is the 2-5% of soil weight.Biological reductant weight is the typical but non-limiting of soil weight
Ratio is 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5% or 5%.
The biomass stabilizer that Cr VI of the present invention repairs in medicament can provide one well for the microorganism in soil
Environment, promote the reduction of microorganism, prevent Cr VI from rebounding, and reproducibility in system can be kept after repairing for a long time
Repairing effect；Biological reductant weight is the 2-5% of soil weight, and biological reductant weight is the typical but non-limit of soil weight
The ratio of property processed is 2%, 2.5%, 3%, 3.5%, 4%, 4.5% or 5%.
The present invention can combine economic height by the adjustment and optimization to Cr VI reparation medicament dosage of each component
Effect, beneficial effect steady in a long-term and environmental-friendly.
As a kind of preferred embodiment of the invention, chemical reducing agent is one of calcium polysulfide or vulcanized sodium or two
Kind.
Biological reductant is the vegetable matter that Vitamin C content is greater than 0.1%；Preferably, the Vitamin C content is big
In 0.1% vegetable matter be one or both of orange peel, fragrant citrus pericarp or apple skin；The partial size of biological reductant is
80-100 mesh.
Biological reductant of the present invention has vitamin C abundant, has good hexavalent chrome reduction repairing effect, and content
The organic acids such as citric acid abundant, malic acid can neutralize soil meta-alkalescence caused by chemical reducing agent.The medicament is nontoxic,
It is without secondary pollution, source is wide and simple is easy to get.
Biomass stabilizer is peat soil.The medicament can improve soil property, have water holding, fertilizer conservation, enhancing
The effect of biological property, to enhance the plantation ecological functions of soil.
Biological reductant and biomass stabilizer in medicament of the present invention are green natural substance, and from a wealth of sources.
According to an aspect of the invention, there is provided Cr VI repairs medicament answering in repairing hexavalent chromium polluted soil
With.According to an aspect of the invention, there is provided Cr VI repairs application method of the medicament in repairing hexavalent chromium polluted soil,
The application method the following steps are included:
Chemical reducing agent, biological reductant and biomass stabilizer are sequentially added into soil carries out soil remediation.
Chemical reducing agent and biological reductant and biomass stabilizer are creatively used in combination and are used for soil by the present invention
It repairs, wherein chemical reducing agent used is basic agent, and biological reductant and biomass stabilizer are natural organic acids medicine
The pH of soil is maintained neutrality by the neutralization of acid with base of medicament itself and the buffer capacity to acid and alkali of soil system by agent
To meta-alkalescence, acid-base accommodation medicament is saved.Biomass stabilizer contain very high organic matter, humic acid and nutrition at
Part, suitable environment can be not only provided for microorganism, but also can be used as soil conditioner, restore the plantation function of soil.Except this
Except, the application method that Cr VI of the present invention repairs medicament is simple, easy to operate.
In present invention further optimization embodiment, chemical reducing agent is added into soil, water is added after mixing, then
It is conserved, after conserving, biological reductant is added.
Hexavalent chrome reduction in soil can be trivalent chromium by the chemical reducing agent being added into soil, be greatly reduced in soil
The content of Cr VI；Chemical reducing agent is one or both of calcium polysulfide or vulcanized sodium.
Preferably, soil to be repaired is needed by broken sieving, and the sieving was 25-35 mesh；Soil is carried out
Broken sieving is uniformly mixed in order to which soil can repair medicament with Cr VI.
Preferably, the additive amount of water is so that soil moisture content is 25%-35%；It is mixed in soil and chemical reducing agent
Afterwards, moisture is added to be conserved again, maintains the water content in soil, is more advantageous to the maintenance to soil.
The time of maintenance is 36-72h；The time conserved after addition chemical reducing agent controls within the scope of 36-72h i.e.
It can.
In present invention further optimization embodiment, biological reductant is added in the soil, water is added after mixing, then
It is conserved, after conserving, biomass stabilizer is added；
The biological reductant being added in the soil is the vegetable matter that Vitamin C content is greater than 0.1%；Preferably, institute
Stating vegetable matter of the Vitamin C content greater than 0.1% is one or both of orange peel, fragrant citrus pericarp or apple skin, partial size
For 80-100 mesh；The biological reductant is the 2-5% of soil weight.
Soil pH after the adjustable chemical reducing agent of biological reductant one side, on the other hand can further supplement
The reduction effect of chemical reducing agent, to reduce the reagent cost of electronation medicament.
Biological reductant of the present invention is nontoxic, without secondary pollution, source is wide and simple is easy to get.
Preferably, the additive amount of the water is so that soil moisture content is 25%-35%；It is mixed in soil and biological reductant
After even, moisture is added and is conserved again, maintains the water content in soil, is more advantageous to the maintenance to soil.
Preferably, the time of the maintenance is 18-30h；The time control conserved after biological reductant is added in 18-
30h.
In present invention further optimization embodiment, biomass stabilizer is added in the soil, mixes；
The biomass stabilizer being added in the soil is peat soil；The biomass stabilizer is the 2-5% of soil weight；
The biomass stabilizer that Cr VI of the present invention is repaired in medicament can provide a good environment for the microorganism in soil, promote
It into the reduction of microorganism, prevents Cr VI from rebounding, and reproducibility repairing effect in system can be kept after repairing for a long time；
Peat soil can improve soil property, have the function of water holding, fertilizer conservation, enhancing biological property, so as to enhance soil
The plantation ecological functions of earth.
It is added after biomass stabilizer stacks 5 days, 10 days, 20 days or 30 days naturally, the content of Cr VI is not in soil
Rebound is maintained under stable content, particularly, with the extension of time, the content of Cr VI also slightly reduces.Adding
After entering Cr VI reparation medicament, content of 6-valence Cr ions is significantly reduced, with the extension of time, content of 6-valence Cr ions keeps stablizing.
The present invention has supplied a kind of Cr VI to repair medicament and its application, and the use in repairing hexavalent chromium polluted soil
Method.Chemical reducing agent is creatively combined with biological reductant, biomass stabilizer and is made by Cr VI reparation medicament of the present invention
With, wherein chemical reducing agent is basic agent, and biological reductant and biomass stabilizer are natural organic acids medicament, is passed through
The neutralization of acid with base of medicament itself and the buffer capacity to acid and alkali of soil system maintain the pH of soil neutral to meta-alkalescence
In range, acid-base accommodation medicament is saved；And biomass stabilizer contains very high organic matter, humic acid and nutrition, both
Suitable environment can be provided for microorganism, and can be used as soil conditioner, restore the plantation function of soil.
The on the one hand soil pH after adjustable chemical reducing agent of biological reductant used in the present invention, on the other hand can be into
One step supplements the reduction effect of chemical reducing agent, to reduce the reagent cost of electronation medicament；Biological reducing of the present invention
Agent is nontoxic, without secondary pollution, source is wide and simple is easy to get.
Biomass stabilizer used in the present invention can provide a good environment for the microorganism in soil, promote micro- life
The reduction of object, prevents Cr VI from rebounding, and can keep after repairing reproducibility repairing effect in system for a long time；Peat soil
Soil property can be improved, have the function of water holding, fertilizer conservation, enhancing biological property, so as to enhance the kind of soil
Plant ecological functions.
Medicament of the present invention reduction efficiency is high, repairing effect is steady in a long-term, compounding is at low cost, is that one kind can have Cr VI
There is the reparation medicament of long-acting stabilization.In addition, the biological reductant and biomass stabilizer in medicament of the present invention are green
Natural materials and from a wealth of sources, it is simple and easy to get.
Technical solution provided by the invention is further described below with reference to embodiment and comparative example.
Embodiment 1
1, hexavalent chromium polluted soil
In the hexavalent chromium polluted place in Shandong, take hexavalent chromium polluted pedotheque to this pharmacy test.
It is air-dried after the acquisition of contaminated soil sample, it is spare after 30 meshes excessively.It is 60mg/kg that this place Cr VI, which repairs target,.
Using USEPA Method 3060A alkali resolution method, diphenyl carbazide spectrophotometry determination of hexavalent chromium.Primary sample detection
It the results are shown in Table 1.
1 embodiment of table, 1 test specimen content of 6-valence Cr ions
| Soil pH | The soil weight | Soil moisture content | Content of 6-valence Cr ions |
| 6.4 | 1.3g/cm3 | 26% | 2512mg/kg |
2, Cr VI repairs medicament
By weight, chemical reducing agent vulcanized sodium is the 1% of soil weight, and biological reductant orange peel powder is soil weight
3%, biomass stabilizer peat be soil weight 2%.
3, Cr VI repairs application method of the medicament in repairing hexavalent chromium polluted soil
(1) it takes 1000 ± 0.1g to cross the pedotheque after 30 meshes, chemical reducing agent vulcanized sodium is added into pedotheque,
It is 10g that additional amount, which is the 1% of soil quality, and suitable quantity of water is added after being uniformly mixed, and keeping soil moisture content is 30%, is supported
Shield 2 days.
(2) biological reductant orange peel powder is added, it is 30g that additional amount, which is the 3% of soil quality, suitable quantity of water is added,
Keeping soil moisture content is 30%, is conserved 1 day.
(3) biomass stabilizer peat is added, it is 20g that additional amount, which is the 2% of soil quality,.
(4) it stacks after the completion of processing, is detected in 5 days, 10 days, 20 days, 30 days time samplings naturally according to the method described above,
The content for detecting Cr VI in soil, is specifically shown in Table 2.
2 embodiment of table, 1 test specimen result
As shown in Table 2, the Cr VI that Cr VI reparation medicament of the present invention can be effectively reduced in hexavalent chromium polluted soil contains
Amount is repaired specifically, embodiment 1 repairs the contaminated soil that medicament is up to 2512mg/kg to content of 6-valence Cr ions using Cr VI
After multiple, the content of 6-valence Cr ions in soil is significantly reduced, and is reduced to 8mg/kg hereinafter, and with the extension of time, after reparation
Soil in content of 6-valence Cr ions be able to maintain stable state.
Embodiment 2
1, hexavalent chromium polluted soil
In the hexavalent chromium polluted place in Gansu, take hexavalent chromium polluted pedotheque to this pharmacy test.
It is air-dried after the acquisition of contaminated soil sample, it is spare after 30 meshes excessively.It is 60mg/kg that this place Cr VI, which repairs target,.
Using USEPA Method 3060A alkali resolution method, diphenyl carbazide spectrophotometry determination of hexavalent chromium.Primary sample detection
It the results are shown in Table 3.
3 test specimen content of 6-valence Cr ions of table
| Soil pH | The soil weight | Soil moisture content | Content of 6-valence Cr ions |
| 6.7 | 1.58g/cm3 | 15% | 1050mg/kg |
2, Cr VI repairs medicament
By weight, chemical reducing agent calcium polysulfide is the 1% of soil weight, and biological reductant orange peel powder is soil weight
The 5% of amount, biomass stabilizer peat are the 5% of soil weight.
3, Cr VI repairs application method of the medicament in repairing hexavalent chromium polluted soil
(1) it takes 1000g to cross the pedotheque after 30 meshes, chemical reducing agent calcium polysulfide is added into pedotheque, adds
Enter the 1% as 10g that amount is soil quality, suitable quantity of water is added after being uniformly mixed, keeping soil moisture content is 30%, maintenance
2 days
(2) the biological reductant orange peel powder for adding soil quality 5% is 50g, and suitable quantity of water is added, and soil is kept to contain
Water rate is 30%, is conserved 1 day.
(3) the biomass stabilizer peat for being added 5% is 50g.
(4) after the completion of handling according to the method described above, after maintenance 5 days, 10 days, 20 days, 30 days, Cr VI in soil is detected
Content is shown in Table 4.
4 embodiment of table, 2 test specimen result
| Natural pilling up time | Soil pH | Soil moisture content | Content of 6-valence Cr ions |
| 5 days | 8.9 | 27% | 7.3mg/kg |
| 10 days | 8.6 | 25% | 7.1mg/kg |
| 20 days | 8.6 | 23% | 6.9mg/kg |
| 30 days | 8.4 | 22% | 6.9mg/kg |
As shown in Table 4, the Cr VI that Cr VI reparation medicament of the present invention can be effectively reduced in hexavalent chromium polluted soil contains
Amount is repaired specifically, embodiment 2 repairs the contaminated soil that medicament is up to 1050mg/kg to content of 6-valence Cr ions using Cr VI
After multiple, the content of 6-valence Cr ions in soil is significantly reduced, and is reduced to 7.5mg/kg hereinafter, and with the extension of time, repairing
Content of 6-valence Cr ions is able to maintain stable state in soil afterwards.
Embodiment 3
1, hexavalent chromium polluted soil
In the hexavalent chromium polluted place in Qinghai, take hexavalent chromium polluted pedotheque to this pharmacy test.
It is air-dried after the acquisition of contaminated soil sample, it is spare after 30 meshes excessively.It is 60mg/kg that this place Cr VI, which repairs target,.
Using USEPA Method 3060A alkali resolution method, diphenyl carbazide spectrophotometry determination of hexavalent chromium.Primary sample detection
It the results are shown in Table 5.
5 test specimen content of 6-valence Cr ions of table
| Soil pH | The soil weight | Soil moisture content | Content of 6-valence Cr ions |
| 5.6 | 1.5g/cm3 | 15.3% | 1670mg/kg |
2, Cr VI repairs medicament
By weight, chemical reducing agent is the 1% of soil weight, and wherein the mass ratio of calcium polysulfide and vulcanized sodium is 2.5:
1, biological reductant orange peel powder is the 2% of soil weight, and biomass stabilizer peat is the 2% of soil weight.
3, Cr VI repairs application method of the medicament in repairing hexavalent chromium polluted soil
(1) it takes 1000g to cross the pedotheque after 30 meshes, chemical reducing agent calcium polysulfide and sulphur is added into pedotheque
Change sodium (mass ratio 2.5:1), it is 10g that additional amount, which is the 1% of soil quality, and suitable quantity of water is added after being uniformly mixed, protects
Holding soil moisture content is 30%, is conserved 2 days.
(2) the biological reductant orange peel powder for adding soil quality 2% is 20g, and suitable quantity of water is added, and soil is kept to contain
Water rate is 30%, is conserved 1 day.
(3) the biomass stabilizer peat for being added 2% is 20g.
(4) after the completion of handling according to the method described above, after maintenance 5 days, 10 days, 20 days, 30 days, Cr VI in soil is detected
Content is shown in Table 6.
6 embodiment of table, 3 test specimen result
As shown in Table 6, the Cr VI that Cr VI reparation medicament of the present invention can be effectively reduced in hexavalent chromium polluted soil contains
Amount is repaired specifically, embodiment 3 repairs the contaminated soil that medicament is up to 1670mg/kg to content of 6-valence Cr ions using Cr VI
After multiple, the content of 6-valence Cr ions in soil is significantly reduced, and is reduced to 7.5mg/kg hereinafter, and with the extension of time, repairing
Content of 6-valence Cr ions is able to maintain stable state in soil afterwards.
Embodiment 4
1, hexavalent chromium polluted soil
In the hexavalent chromium polluted place in Shandong, take hexavalent chromium polluted pedotheque to this pharmacy test.
It is air-dried after the acquisition of contaminated soil sample, it is spare after 30 meshes excessively.It is 60mg/kg that this place Cr VI, which repairs target,.
Using USEPA Method 3060A alkali resolution method, diphenyl carbazide spectrophotometry determination of hexavalent chromium.Primary sample detection
It the results are shown in Table 7.
7 embodiment of table, 4 test specimen content of 6-valence Cr ions
| Soil pH | The soil weight | Soil moisture content | Content of 6-valence Cr ions |
| 6.3 | 1.3g/cm3 | 24% | 8407mg/kg |
2, Cr VI repairs medicament
By weight, chemical reducing agent vulcanized sodium is the 3% of soil weight, and biological reductant orange peel powder is soil weight
3%, biomass stabilizer peat be soil weight 4%.
3, Cr VI repairs application method of the medicament in repairing hexavalent chromium polluted soil
(1) it takes 1000 ± 0.1g to cross the pedotheque after 30 meshes, chemical reducing agent vulcanized sodium is added into pedotheque,
It is 30g that additional amount, which is the 3% of soil quality, and suitable quantity of water is added after being uniformly mixed, and keeping soil moisture content is 30%, is supported
Shield 2 days.
(2) biological reductant orange peel powder is added, it is 30g that additional amount, which is the 3% of soil quality, suitable quantity of water is added,
Keeping soil moisture content is 30%, is conserved 1 day.
(3) biomass stabilizer peat is added, it is 40g that additional amount, which is the 4% of soil quality,.
(4) it stacks after the completion of processing, is detected in 5 days, 10 days, 20 days, 30 days time samplings naturally according to the method described above,
The content for detecting Cr VI in soil, is specifically shown in Table 2.
8 embodiment of table, 4 test specimen result
| Natural pilling up time | Soil pH | Soil moisture content | Content of 6-valence Cr ions |
| 5 days | 10.2 | 28% | 8.9mg/kg |
| 10 days | 9.5 | 26% | 8.5mg/kg |
| 20 days | 9.1 | 24% | 8.2mg/kg |
| 30 days | 8.9 | 22% | 8.1mg/kg |
As shown in Table 8, the Cr VI that Cr VI reparation medicament of the present invention can be effectively reduced in hexavalent chromium polluted soil contains
Amount is repaired specifically, embodiment 4 repairs the contaminated soil that medicament is up to 8407mg/kg to content of 6-valence Cr ions using Cr VI
After multiple, the content of 6-valence Cr ions in soil is significantly reduced, and is reduced to 9mg/kg hereinafter, and with the extension of time, after reparation
Soil in content of 6-valence Cr ions be able to maintain stable state.
Embodiment 5
1, hexavalent chromium polluted soil
In the hexavalent chromium polluted place in Gansu, take hexavalent chromium polluted pedotheque to this pharmacy test.
It is air-dried after the acquisition of contaminated soil sample, it is spare after 30 meshes excessively.It is 60mg/kg that this place Cr VI, which repairs target,.
Using USEPA Method 3060A alkali resolution method, diphenyl carbazide spectrophotometry determination of hexavalent chromium.Primary sample detection
It the results are shown in Table 3.
9 test specimen content of 6-valence Cr ions of table
| Soil pH | The soil weight | Soil moisture content | Content of 6-valence Cr ions |
| 6.2 | 1.58g/cm3 | 15% | 5415mg/kg |
2, Cr VI repairs medicament
By weight, chemical reducing agent calcium polysulfide is the 5% of soil weight, and biological reductant orange peel powder is soil weight
The 4% of amount, biomass stabilizer peat are the 4% of soil weight.
3, Cr VI repairs application method of the medicament in repairing hexavalent chromium polluted soil
(1) it takes 1000g to cross the pedotheque after 30 meshes, chemical reducing agent calcium polysulfide is added into pedotheque, adds
Entering amount is soil quality, and 5% is 50g, and suitable quantity of water is added after being uniformly mixed, and keeping soil moisture content is 30%, maintenance 2
It.
(2) the biological reductant orange peel powder for adding soil quality 4% is 40g, and suitable quantity of water is added, and soil is kept to contain
Water rate is 30%, is conserved 1 day.
(3) the biomass stabilizer peat for being added 4% is 40g.
(4) after the completion of handling according to the method described above, after maintenance 5 days, 10 days, 20 days, 30 days, Cr VI in soil is detected
Content is shown in Table 6.
10 embodiment of table, 5 test specimen result
| Natural pilling up time | Soil pH | Soil moisture content | Content of 6-valence Cr ions |
| 5 days | 10.7 | 28% | 8.1mg/kg |
| 10 days | 9.7 | 25% | 7.8mg/kg |
| 20 days | 9.2 | 22% | 7.7mg/kg |
| 30 days | 8.8 | 21% | 7.7mg/kg |
As shown in Table 10, the Cr VI that Cr VI reparation medicament of the present invention can be effectively reduced in hexavalent chromium polluted soil contains
Amount is repaired specifically, embodiment 5 repairs the contaminated soil that medicament is up to 5415mg/kg to content of 6-valence Cr ions using Cr VI
After multiple, the content of 6-valence Cr ions in soil is significantly reduced, and is reduced to 8.1mg/kg hereinafter, and with the extension of time, repairing
Content of 6-valence Cr ions is able to maintain stable state in soil afterwards.
It is above-mentioned the experimental results showed that, Cr VI of the present invention repairs medicament creatively by chemical reducing agent and biological reducing
Agent, biomass stabilizer are used in combination, and will can effectively reduce the content of Cr VI in soil, can combine economic height
Effect, effect steady in a long-term and environmental-friendly.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (10)
1. a kind of Cr VI repairs medicament, which is characterized in that the reparation medicament mainly by chemical reducing agent, biological reductant and
Biomass stabilizer composition；
Wherein, chemical reducing agent is the 1-5% of soil weight, and biological reductant is the 2-5% of soil weight, biomass stabilizer
For the 2-5% of soil weight.
2. reparation medicament according to claim 1, which is characterized in that the chemical reducing agent is calcium polysulfide or vulcanized sodium
One or both of；
Preferably, the biological reductant is the vegetable matter that Vitamin C content is greater than 0.1%；It is highly preferred that the dimension life
Vegetable matter of the plain C content greater than 0.1% is one or both of orange peel, fragrant citrus pericarp or apple skin；
Preferably, the partial size of the biological reductant is 80-100 mesh；
Preferably, the biomass stabilizer is peat soil.
3. the application of any of claims 1 or 2 for repairing medicament in repairing hexavalent chromium polluted soil.
4. the application method of any of claims 1 or 2 for repairing medicament in repairing hexavalent chromium polluted soil, which is characterized in that
The application method the following steps are included:
Chemical reducing agent, biological reductant and biomass stabilizer are sequentially added into soil carries out soil remediation.
5. application method according to claim 4, which is characterized in that chemical reducing agent is added into soil, adds after mixing
Then water is conserved, after conserving, biological reductant is added.
6. application method according to claim 5, which is characterized in that the soil is the soil after broken sieving, described
Sieving was 25-35 mesh；
And/or the chemical reducing agent is the one or two of calcium polysulfide or vulcanized sodium；
And/or the chemical reducing agent is the 1-5% of soil weight；
And/or the additive amount of the water is so that soil moisture content is 25%-35%；
And/or the time of the maintenance is 36-72h.
7. according to the described in any item application methods of claim 4-6, which is characterized in that biological reductant is added in the soil,
Add water after mixing, then conserved, after conserving, biomass stabilizer is added.
8. application method according to claim 7, which is characterized in that the biological reductant is greater than for Vitamin C content
0.1% vegetable matter；It is highly preferred that vegetable matter of the Vitamin C content greater than 0.1% is orange peel, orange
One or both of skin or apple skin；
And/or the partial size of the biological reductant is 80-100 mesh；
And/or the biological reductant is the 2-5% of soil weight；
And/or the additive amount of the water is so that soil moisture content is 25%-35%；
And/or the time of the maintenance is 18-30h.
9. according to the described in any item application methods of claim 4-8, which is characterized in that biomass is added in the soil and stablizes
Agent mixes.
10. application method according to claim 9, which is characterized in that the biomass stabilizer is peat soil；
And/or the biomass stabilizer is the 2-5% of soil weight.
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Cited By (1)
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| CN114570758A (en) * | 2022-02-24 | 2022-06-03 | 河北华勘地质勘查有限公司 | Method for repairing hexavalent chromium contaminated soil and repairing agent |
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Application publication date: 20181228 |