CN107282626A - A kind of lead-contaminated soil stabilizes restorative procedure - Google Patents
A kind of lead-contaminated soil stabilizes restorative procedure Download PDFInfo
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- CN107282626A CN107282626A CN201710710686.7A CN201710710686A CN107282626A CN 107282626 A CN107282626 A CN 107282626A CN 201710710686 A CN201710710686 A CN 201710710686A CN 107282626 A CN107282626 A CN 107282626A
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- lead
- contaminated soil
- soil
- restorative procedure
- stabilizes
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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
- B09C2101/00—In situ
Abstract
The present invention discloses a kind of lead-contaminated soil and stabilizes restorative procedure, belongs to heavy-metal contaminated soil and repairs field；The sepiolite that soluble tripolyphosphate and pyridinedicarboxylic acid are modified is hybridly prepared into compound stabilizer by the present invention, and compound stabilizer is added in lead-contaminated soil, it is well mixed, villaumite parsing agent solution is sprayed on contaminated soil, then risk control requirement can be met by carrying out contaminated soil after anaerobism maintenance, stabilization.Lead in soil is secured firmly in soil by the present invention by principles such as parsing, activation, precipitation, absorption, reaches its transfer ability of reduction and biological effectiveness.
Description
Technical field
Field is repaired the present invention relates to heavy-metal contaminated soil, and in particular to a kind of lead-contaminated soil stabilizes reparation side
Method.
Background technology
In environment lead contamination be mainly derived from smelting, manufacture and using leadwork enterprise, next to that automobile discharge contain
Lead tail gas.Lead is that soil pollution by heavy metal is distributed more widely general, with strong accumulative environmental contaminants.Lead enters soil environment
Approach mainly have air land pollutant dried wet deposition, lead waste water dirt is filled, leaded solid waste directly pollutes, agricultural chemicals and chemical fertilizer make
With etc..Lead one kind accumulation property toxicant, can constantly be accumulated in human body, in soil lead can be contacted by skin, oral route
Into human body, and then influence health, nerve, digestion, the immune and reproductive system of serious infringement people.Into the lead in soil
It is present in topsoil mostly, hardly moves down, combined with the organic matter in soil, pole is not readily dissolved.There is scholar to China
Content of Pb in Soil is measured and statistics is drawn, China's Content of Pb in Soil can reach 1143 μ g/g, minimum 0.68 μ g/g,
26 μ g/g can averagely be reached.
At present, lead-contaminated soil reparation mainly has following several method：
(1) heavy metal pollution of soil：This method is that lead-contaminated soil is dug clearly to and is transported to landfill yard landfill, then is changed digging region clearly
Fresh soil, is the transfer process of a pollutant and risk, and pollutant does not obtain actual processing.
(2) elution method：This method is that one kind is drenched lead using eluents such as surfactant, acid, chelating agents from soil
Come out, then handle wastewater eluting.This method can effectively reduce the total amount of lead in soil, but this method is applied to high concentration
Lead contamination, and cost is higher, while may cause soil secondary pollution using substantial amounts of chemical leaching.
(3) phytoremediation：This method is the lead in lead contamination ecological region planting lead super enriching plant, plant absorption soil
And plant body weight is enriched in, to the regular hour, harvesting processing is carried out to plant.This method repair time is long, it is difficult in regulation
Reparation task is completed in duration, meanwhile, planting plants land occupation, the normal of influence soil is used.
(4) electro reclamation：This method is that electrode is set in lead-contaminated soil, and lead is moved under the function of current to minus plate
Move and be enriched on pole plate, reach the purpose for removing heavy metal in soil.This method function of current is in small distance, it is adaptable to facet
Contamination contaminates, and is actually pollution in wide area, and processing cost is of a relatively high.
(5) stabilisation/deactivation method：This method is that stabilizer is added in lead-contaminated soil, by redox, precipitation,
Absorption, complexing etc. principle by the lead in soil be converted into low transfer ability, low biological effectiveness material, to reduce lead in soil
Environmental risk.This method has low cost, instant effect, does not influence the features such as soil is normally used.
In summary, stabilisation/passivating technique is still current most promising lead-contaminated soil recovery technique, and is opened
Send out effective and the problem of practicable stabilisation/passivating technique is current in the urgent need to address.
The content of the invention
In order to overcome the shortcomings of the prior art, stabilize and repair the invention provides a kind of lead-contaminated soil
Method, the characteristics of free state is few in soil according to lead ion, the sedimentation and activation of lead ion are realized by tripolyphosphate, are led to
The superacidulated sepiolite big with specific surface area is acidified to soil, is accelerated the free activation of lead ion, is further passed through
The chelant of pyridine realizes the free absorption of the stabilization of lead ion, can effectively reduce the leaching concentration of lead in contaminated soil, and then reduce
The environmental risk of contaminated soil.
The present invention provides a kind of lead-contaminated soil and stabilizes restorative procedure, and it uses soluble tripolyphosphate and pyridine two
The sepiolite that formic acid is modified is prepared into compound stabilizer and lead soil is repaired.
Wherein, soluble villaumite is also further added in the restorative procedure to be parsed.
Wherein, the restorative procedure is specifically included：
The first step, the preparation of compound stabilizer：The sepiolite that soluble tripolyphosphate and pyridinedicarboxylic acid are modified is pressed
Certain ratio, which is sufficiently mixed, is configured to compound stabilizer；
Second step, compound stabilizer is added：A certain amount of compound stabilizer is applied into the lead contamination by crushing and screening
In soil, and medicament and soil are well mixed；
3rd step, parses the preparation of agent solution：The parsing agent of soluble villaumite is dissolved in water and is configured to certain density molten
Liquid；
4th step, parses adding for agent solution：Villaumite parsing agent solution is sprayed on contaminated soil, contains contaminated soil
Water is close to saturation；
5th step, anaerobism maintenance：Two layers of LDPE antiseepage film is covered on contaminated soil surface, stabilization procedures is maintained at and detests
In oxygen environment, and prevent from washing away, leaching, curing time is 7~15 days.
Wherein, the preparation method of the sepiolite of the pyridine dimethyl acidifying is specially：
The first step, sepiolite is placed in heating furnace, is warming up to 130 DEG C, is then maintained at a temperature of this 15 hours, is eliminated
Moisture in sepiolite surface and duct；
Second step, the sepiolite for eliminating moisture is put into rapidly in the solution equipped with pyridinedicarboxylic acid, the pyridine 2,6-
Dioctyl phthalate is dissolved in water, and the concentration of solution is 20g/L~35g/L, stirring immersion 3~5 days.
The tripolyphosphate is sodium tripolyphosphate, tripolyphosphate magnesium.
The arbitrary pyridinedicarboxylic acid is pyridine 2,6- dioctyl phthalate.
Soluble tripolyphosphate and high-specific surface area the pyridinedicarboxylic acid modified meerschaum ratio is preferably 1: 9~3:
7。
The compound stabilizer dosage is the 2~10% of contaminated soil quality.
The soluble villaumite parsing agent can be MgCl2Or CaCl2Or two kinds of mixing.
Wherein, the concentration for the aqueous solution that the parsing agent is configured to is preferably 0.05~0.5% mass percent.
The present invention has the characteristics that compared with prior art：
(1) lead-contaminated soil reparation of the present invention is to carry out in the original location, reduces lead-contaminated soil diffusion to greatest extent, causes week
Surrounding environment pollutes；
(2) present invention is taken from environment, is used for environment, will not cause shadow to environment using sepiolite as sorbing material
Ring, the introducing of pyridinedicarboxylic acid not only adds the acidity of soil, meanwhile, the chelant of pyridine preferably adsorbs lead ion, surely
It is fixed, it is to avoid lead ion is stayed in soil；
(3) present invention employs containing hydrogen orthophosphate, there is multiple action containing hydrogen orthophosphate, precipitated as lead activator, lead
Agent, meanwhile, unnecessary phosphate can as plant growth nutrient, and use the trimerization phosphorus in structure for chain structure
Hydrochlorate, disperses and all better to the chelant adsorption effect of lead ion in soil；
(4) present invention is used as parsing agent, Ca using soluble villaumite2+And Mg2+Heavy metal can be desorbed by ion from soil,
And then shifted into clay mineral, meanwhile, C1- can combine to form the lower compound of solubility with lead, phosphate in villaumite, enter
One step improves the stabilization effect of lead.
Brief description of the drawings
Fig. 1 is the infrared spectrum of pyridinedicarboxylic acid modified meerschaum.
Embodiment
The present invention provides a kind of lead-contaminated soil and stabilizes restorative procedure, comprises the following steps：
The first step, the preparation of compound stabilizer：The sepiolite that soluble tripolyphosphate and pyridinedicarboxylic acid are modified is pressed
Certain ratio, which is sufficiently mixed, is configured to compound stabilizer；
Second step, compound stabilizer is added：A certain amount of compound stabilizer is applied into the lead contamination by crushing and screening
In soil, and medicament and soil are well mixed；
3rd step, parses the preparation of agent solution：The parsing agent of soluble villaumite is dissolved in water and is configured to certain density molten
Liquid；
4th step, parses adding for agent solution：Villaumite parsing agent solution is sprayed on contaminated soil, contains contaminated soil
Water is close to saturation；
5th step, anaerobism maintenance：Two layers of LDPE antiseepage film is covered on contaminated soil surface, stabilization procedures is maintained at and detests
In oxygen environment, and prevent from washing away, leaching, curing time is 7~15 days.
The application carries out Absorptive complex wave using tripolyphosphate to lead ion.Phosphorated material is a kind of weight in lead soil pollution
The renovation agent wanted, phosphorus can be low with lead ion formation dissolubility, and metastable compound has efficiently to the lead ion of divalence
Removal effect.The structure of different phosphorated materials is different, and dispersion effect is different, just has to the assimilation effect of lead (II) ion
Institute is different, and the application is handled using tripolyphosphate, to the more other phosphorated material effects of removal effect of lead ion more
It is good, therefore applicant speculates the dispersion effect of the phosphate (tripolyphosphate) of chain, it is more scattered than ring-type (trimetaphosphate)
Effect more preferably, scattered effect can be preferably played as the polyphosphate sodium of chain, to the assimilation effect of lead (II) ion more
It is good.In addition, phosphate can form complex state, complexing energy of the tripolyphosphate than the metaphosphate of ring-type of chain with lead ion
Power is stronger.
Individually settled, repaired, although dispersion effect is good, and complexing power is stronger using phosphorated material, but unidirectional network
Close reaction or unstable.In heavy metal wastewater thereby, the most efficient method of processing heavy metal is absorption method, can be by porous
The adsorption capacity of the clay mineral materials of property, heavy-metal ion removal.But in soil pollution, free heavy metal ion compared with
Less in water, lead ion enters in soil environment can occur physically or chemically to adsorb with soil environment, such as is inhaled with soil colloid
It is attached, occur ion exchange with humus, chelant is carried out with humic acid.Pass through lead ion and the different Coulomb force of soil or formation chemistry
Key, realizes absorption of the lead ion in soil, influences its mobility.PH value affects absorption of the lead ion in soil in soil
And desorption process.In common slight alkali environment, soil particle total surface is electrically negative, and lead ion is adsorbed, in soil
Preserve, it is not easily shifted, and in slant acidity environment, free trend occurs for lead ion substantially, increase activity.In the present invention, lead to
Special modified porous property clay mineral material is crossed, the sepiolite being specially modified improves its acidity, makes to put into soil
Clay pit wood material increases the acidity value of surrounding soil, increases free lead ion, improves it in porous clays mineral material
Absorption property in sepiolite.
In numerous clay mineral materials, sepiolite is that a kind of construction unit sticks for the magnesia silicate of fibrous porous richness
Native mineral, its construction unit is that silicon-oxy tetrahedron and magnesia are octahedra, with larger internal gutter, than bentonite, covers de-
The pore size of other clay pit wood material such as stone is big, and ion exchange capacity is more.But generally, using sepiolite Adsorption of Heavy Metals
The problem of ion has certain, the pore passage structure of sepiolite is a three-dimensional structure, the silicon magnesium of tetrahedral sheet and octahedral sheet
Magnesia structure is staggered, and poroid tunnel is filled with the molecule silicate in zeolite water, Hydrogenbond to hole, these fillings
Adsorption capacity of the zeolite water molecules influence sepiolite to lead ion.In this application, zeolite is substituted by using pyridinedicarboxylic acid
Water, pyridinedicarboxylic acid is adsorbed in duct, zeolite water is substituted, while in duct outer surface further through chelating ability and porous silicate
With reference to.
Due to introducing the pyridine structure with acid groups, be acidified sepiolite, advantageously in the free of lead ion and
Absorption in sepiolite.And have the oxygen atom and nitrogen-atoms of electron in the structure of pyridinedicarboxylic acid, it can be formed with lead ion
Stable chelant product, this also further promotes lead ion to be adsorbed onto in the duct of sepiolite, increases its stability.
The sepiolite that the present invention is provided is acidified sepiolite, the system of the sepiolite of pyridine dimethyl acidifying by pyridinedicarboxylic acid
Preparation Method is specially：
The first step, sepiolite is placed in heating furnace, is warming up to 130 DEG C, is then maintained at a temperature of this 15 hours, is eliminated
Moisture in sepiolite surface and duct；
Second step, the sepiolite for eliminating moisture is put into rapidly in the solution equipped with pyridinedicarboxylic acid, the pyridine 2,6-
Dioctyl phthalate is dissolved in water, and the concentration of solution is 20g/L~35g/L, stirring immersion 3~5 days.
The tripolyphosphate is preferably sodium tripolyphosphate, tripolyphosphate magnesium etc., preferably sodium tripolyphosphate.
The arbitrary pyridinedicarboxylic acid may be incorporated for the present invention, preferably pyridine 2,6- dioctyl phthalate.
Soluble tripolyphosphate and high-specific surface area the pyridinedicarboxylic acid modified meerschaum ratio is preferably 1: 9~3:
7, if soluble tripolyphosphate addition is excessive, the amount of modified meerschaum is not enough, and the sour environment influence on soil is small, no
Easily make lead ion separate out, promote the absorption of tripolyphosphate and sepiolite duct to lead ion.
The compound stabilizer dosage is the 2~10% of contaminated soil quality.
The soluble villaumite parsing agent can be MgCl2Or CaCl2Or two kinds of mixing, it is water-soluble that the parsing agent is configured to
The concentration of liquid is preferably 0.05~0.5% mass percent.
The present invention is described in further detail with reference to embodiment, but protection scope of the present invention is not limited
In the content.
The preparation of the modified meerschaum of embodiment 1
Sepiolite is placed in heating furnace, 130 DEG C are warming up to, the lifting of temperature-rise period temperature is uniform, 1 DEG C of deduction per minute~
2 DEG C, it is then maintained at a temperature of this 15 hours, eliminates the moisture in sepiolite surface and duct, the Hai Pao of moisture will be eliminated
Stone is put into rapidly equipped with pyridine 2, and in the solution of 6- dioctyl phthalate, the pyridine 2,6- dioctyl phthalate is dissolved in water, the concentration of solution
For 30g/L, stirring immersion 5 days obtains the sepiolite that pyridinedicarboxylic acid is modified.
Modified meerschaum is detected using infrared spectrum, infrared absorption spectroscopy is become by Magna560ESP types Fourier
Change determination of infrared spectroscopy, KBr tablettings, 400~4000cm of analyst coverage-1。
As shown in figure 1, compared with sepiolite, the sepiolite that pyridinedicarboxylic acid is modified is in 1451cm-1And 1352cm-1Place has
Two stronger absworption peaks, the two absworption peaks are that pyridine is brought, and original sepiolite is in 3450cm-1~3550cm-1
There is the sepiolite of a wide absworption peak after modification not find, this is probably the hydroxyl vibration peak that original zeolite water is produced
Disappear.
The preparation of the modified meerschaum of comparative example 1
Sepiolite is placed in heating furnace, 130 DEG C are warming up to, the lifting of temperature-rise period temperature is uniform, 1 DEG C of deduction per minute~
2 DEG C, it is then maintained at a temperature of this 15 hours, eliminates the moisture in sepiolite surface and duct, the Hai Pao of moisture will be eliminated
Stone is put into rapidly equipped with pyridine 2, and in the solution of 6- dioctyl phthalate, the pyridine 2,6- dioctyl phthalate is dissolved in water, the concentration of solution
For 5g/L, stirring immersion 5 days obtains pyridine.
Embodiment 2
The targeted soil of the present embodiment is certain lead-contaminated soil, and lead concentration is 7420mg/kg in soil, according to《Solid
Waste Leaching leaching method sulfonitric method》(HJ/T 299-2007) leaching concentration be 286mg/L, test area 5m ×
5m。
Repair the lead-contaminated soil key step as follows：
(1) preparation of compound stabilizer：Modified meerschaum in mass ratio 3: 7 prepared by sodium tripolyphosphate and embodiment 1
It is sufficiently mixed and is configured to compound stabilizer；
(2) compound stabilizer is added：The compound stabilizer of contaminated soil 4% is applied into the lead contamination by crushing and screening
In soil, and medicament and soil are well mixed；
(3) preparation of agent solution is parsed：By MgCl2·6H2O is dissolved in water and is configured to 0.3% magnesium chloride solution；
(4) adding for agent solution is parsed：Villaumite parsing agent solution is sprayed on contaminated soil, makes contaminated soil water content
Close to saturation；
(5) anaerobism is conserved：Two layers of LDPE antiseepage film is covered on contaminated soil surface, stabilization procedures is maintained at anaerobism ring
In border, and prevent from washing away, leaching, curing time is 7 days.
After being stabilized according to above-mentioned steps to lead-contaminated soil, in soil lead according to《Solid waste Leaching soaks
Go out method sulfonitric method》(HJ/T 299-2007) leaching concentration is reduced to 0.21mg/L by 286mg/L.
Embodiment 3
The targeted soil of the present embodiment is certain lead-contaminated soil, and lead concentration is 3750mg/kg in soil, according to《Solid
Waste Leaching leaching method sulfonitric method》(HJ/T 299-2007) leaching concentration be 134mg/L, test area 5m ×
5m。
Repair the lead-contaminated soil key step as follows：
(1) preparation of compound stabilizer：Modified meerschaum in mass ratio 1: 9 prepared by sodium tripolyphosphate and embodiment 1
It is sufficiently mixed and is configured to compound stabilizer；
(2) compound stabilizer is added：The compound stabilizer of contaminated soil 7% is applied into the lead contamination by crushing and screening
In soil, and medicament and soil are well mixed；
(3) preparation of agent solution is parsed：By CaCl2·2H2O is dissolved in water and is configured to 0.1% calcium chloride solution；
(4) adding for agent solution is parsed：Villaumite parsing agent solution is sprayed on contaminated soil, makes contaminated soil water content
Close to saturation；
(5) anaerobism is conserved：Two layers of LDPE antiseepage film is covered on contaminated soil surface, stabilization procedures is maintained at anaerobism ring
In border, and prevent from washing away, leaching, curing time is 10 days.
After being stabilized according to above-mentioned steps to lead-contaminated soil, in soil lead according to《Solid waste Leaching soaks
Go out method sulfonitric method》(HJ/T 299-2007) leaching concentration is reduced to 0.16mg/L by 134mg/L.
Embodiment 4
The targeted soil of the present embodiment is certain lead-contaminated soil, and lead concentration is 1230mg/kg in soil, according to《Solid
Waste Leaching leaching method sulfonitric method》(HJ/T 299-2007) leaching concentration be 54mg/L, test area 5m ×
5m。
Repair the lead-contaminated soil key step as follows：
(1) preparation of compound stabilizer：Modified meerschaum in mass ratio 1: 4 prepared by tripolyphosphate magnesium and embodiment 1
It is sufficiently mixed and is configured to compound stabilizer；
(2) compound stabilizer is added：The compound stabilizer of contaminated soil 3% is applied into the lead contamination by crushing and screening
In soil, and medicament and soil are well mixed；
(3) preparation of agent solution is parsed：By CaCl2·2H2O is dissolved in water and is configured to 0.05% calcium chloride solution；
(4) adding for agent solution is parsed：Villaumite parsing agent solution is sprayed on contaminated soil, makes contaminated soil water content
Close to saturation；
(5) anaerobism is conserved：Two layers of LDPE antiseepage film is covered on contaminated soil surface, stabilization procedures is maintained at anaerobism ring
In border, and prevent from washing away, leaching, curing time is 15 days.
After being stabilized according to above-mentioned steps to lead-contaminated soil, in soil lead according to《Solid waste Leaching soaks
Go out method sulfonitric method》(HJ/T299-2007) leaching concentration is reduced to below test limit by 54mg/L.
By experimental verification above, the stable restorative procedure of the lead-contaminated soil provided using the present invention can be fine
Realize reparation of the lead ion in soil.
Comparative example 2
Soil environment in example 2 carries out contrast test, and test area 5m × 5m, targeted soil is dirty for certain lead
It is 7420mg/kg to contaminate lead concentration in soil, soil, according to《Solid waste Leaching leaching method sulfonitric method》(HJ/T
299-2007) leaching concentration is 286mg/L.
Repair the lead-contaminated soil key step as follows：
(1) stabilizer is added：The sodium tripolyphosphate of contaminated soil quality 3% is applied into the lead contamination by crushing and screening
In soil, and medicament and soil are well mixed；
(2) preparation of agent solution is parsed：By MgCl2·6H2O is dissolved in water and is configured to 0.3% magnesium chloride solution；
(3) adding for agent solution is parsed：Villaumite parsing agent solution is sprayed on contaminated soil, makes contaminated soil water content
Close to saturation；
(4) anaerobism is conserved：Two layers of LDPE antiseepage film is covered on contaminated soil surface, stabilization procedures is maintained at anaerobism ring
In border, and prevent from washing away, leaching, curing time is 7 days.
After being stabilized according to above-mentioned steps to lead-contaminated soil, in soil lead according to《Solid waste Leaching soaks
Go out method sulfonitric method》(HJ/T 299-2007) leaching concentration is reduced under 153mg/L by 286mg/L.
Although individually can also carry out certain reparation, repairing effect to the lead ion in soil using tripolyphosphate
It is good compared with the sepiolite repairing effect being modified using tripolyphosphate and pyridinedicarboxylic acid.
Comparative example 3
Soil environment in example 2 carries out contrast test, and test area 5m × 5m, targeted soil is dirty for certain lead
It is 7420mg/kg to contaminate lead concentration in soil, soil, according to《Solid waste Leaching leaching method sulfonitric method》(HJ/T
299-2007) leaching concentration is 286mg/L.
Repair the lead-contaminated soil key step as follows：
(1) stabilizer is added：The sodium metaphosphate of contaminated soil quality 3% is applied into the lead contamination soil by crushing and screening
In earth, and medicament and soil are well mixed；
(2) preparation of agent solution is parsed：By MgCl2·6H2O is dissolved in water and is configured to 0.3% magnesium chloride solution；
(3) adding for agent solution is parsed：Villaumite parsing agent solution is sprayed on contaminated soil, makes contaminated soil water content
Close to saturation；
(4) anaerobism is conserved：Two layers of LDPE antiseepage film is covered on contaminated soil surface, stabilization procedures is maintained at anaerobism ring
In border, and prevent from washing away, leaching, curing time is 7 days.
After being stabilized according to above-mentioned steps to lead-contaminated soil, in soil lead according to《Solid waste Leaching soaks
Go out method sulfonitric method》(HJ/T 299-2007) leaching concentration is reduced under 223mg/L by 286mg/L.
Compare comparative example 2 and comparative example 3, sodium tripolyphosphate substituted as stabilizer rehabilitating soil using sodium trimetaphosphate,
To repairing effect of the lead ion in soil and bad, this may be exactly because sodium trimetaphosphate is as a kind of cyclic structure, compared with
Caused by dispersion effect of the sodium tripolyphosphate in soil is worse.
Comparative example 4
Soil environment in example 2 carries out contrast test, and test area 5m × 5m, targeted soil is dirty for certain lead
It is 7420mg/kg to contaminate lead concentration in soil, soil, according to《Solid waste Leaching leaching method sulfonitric method》(HJ/T
299-2007) leaching concentration is 286mg/L.
Repair the lead-contaminated soil key step as follows：
(1) preparation of compound stabilizer：Modified meerschaum in mass ratio 3: 7 prepared by sodium tripolyphosphate and comparative example 1
It is sufficiently mixed and is configured to compound stabilizer；
(2) compound stabilizer is added：The compound stabilizer of contaminated soil 4% is applied into the lead contamination by crushing and screening
In soil, and medicament and soil are well mixed；
(3) preparation of agent solution is parsed：By MgCl2·6H2O is dissolved in water and is configured to 0.3% magnesium chloride solution；
(4) adding for agent solution is parsed：Villaumite parsing agent solution is sprayed on contaminated soil, makes contaminated soil water content
Close to saturation；
(5) anaerobism is conserved：Two layers of LDPE antiseepage film is covered on contaminated soil surface, stabilization procedures is maintained at anaerobism ring
In border, and prevent from washing away, leaching, curing time is 7 days.
After being stabilized according to above-mentioned steps to lead-contaminated soil, in soil lead according to《Solid waste Leaching soaks
Go out method sulfonitric method》(HJ/T 299-2007) leaching concentration is reduced to 165mg/L by 286mg/L.
Compare comparative example 4 and embodiment 2, when the pyridinedicarboxylic acid that the pyridinedicarboxylic acid modified meerschaum of use is added contains
When measuring relatively low, repair to lead soil is simultaneously bad, this consider may the reason for be the pyridine diformazan in sepiolite aperture
Sour consumption is not enough, is not bonded sufficiently in duct, because the consumption of pyridinedicarboxylic acid is on the low side, to soil acidity shadow
Ring not enough, the soil pH value of compound stabilizer and the soil pH value of comparative example 4 are added by testing example 2, it has been found that real
The soil pH of example 2 is applied after addition compound stabilizer stirs, pH value reaches 3.2, and adds the stable composition of comparative example 4
Agent, soil pH value only has 5.6 after stirring, the Different Effects of soil pH value lead ion it is free, to final lead ion
Absorption produces bigger difference.
Comparative example 5
Soil environment in embodiment 3 carries out lead concentration in contrast test, test area 5m × 5m, soil
3750mg/kg, according to《Solid waste Leaching leaching method sulfonitric method》(HJ/T 299-2007) leaching concentration is
134mg/L, test area 5m × 5m.
Repair the lead-contaminated soil key step as follows：
(1) preparation of compound stabilizer：Sodium tripolyphosphate and commercially available bentonite in mass ratio 1: 9 are sufficiently mixed and be configured to
Compound stabilizer；
(2) compound stabilizer is added：The compound stabilizer of contaminated soil 7% is applied into the lead contamination by crushing and screening
In soil, and medicament and soil are well mixed；
(3) preparation of agent solution is parsed：By CaCl2·2H2O is dissolved in water and is configured to 0.1% calcium chloride solution；
(4) adding for agent solution is parsed：Villaumite parsing agent solution is sprayed on contaminated soil, makes contaminated soil water content
Close to saturation；
(5) anaerobism is conserved：Two layers of LDPE antiseepage film is covered on contaminated soil surface, stabilization procedures is maintained at anaerobism ring
In border, and prevent from washing away, leaching, curing time is 10 days.
After being stabilized according to above-mentioned steps to lead-contaminated soil, in soil lead according to《Solid waste Leaching soaks
Go out method sulfonitric method》(HJ/T 299-2007) leaching concentration is reduced to 76mg/L by 134mg/L.
When the sepiolite for replacing pyridinedicarboxylic acid to be modified using bentonite enters, quadrat repairing effect is more weaker, and this is probably
Because on the one hand bentonitic duct specific surface area is small compared with sepiolite, on the other hand without acid modification, to the acidity in soil
Environment lacks influence, thus is difficult to the free activation of effectively lead ion.
Claims (10)
1. a kind of lead-contaminated soil stabilizes restorative procedure, it is characterised in that：Using soluble tripolyphosphate and pyridine diformazan
The modified sepiolite of acid is prepared into compound stabilizer and lead soil is repaired.
2. lead-contaminated soil as claimed in claim 1 stabilizes restorative procedure, it is characterised in that：Also enter in the restorative procedure
One step adds soluble villaumite and parsed.
3. lead-contaminated soil as claimed in claim 1 or 2 stabilizes restorative procedure, it is characterised in that：The restorative procedure tool
Body includes：
The first step, the preparation of compound stabilizer：The sepiolite that soluble tripolyphosphate and pyridinedicarboxylic acid are modified is by certain
Ratio be sufficiently mixed and be configured to compound stabilizer；
Second step, compound stabilizer is added：A certain amount of compound stabilizer is applied into the lead-contaminated soil by crushing and screening
In, and medicament and soil are well mixed；
3rd step, parses the preparation of agent solution：The parsing agent of soluble villaumite is dissolved in water and certain density solution is configured to；
4th step, parses adding for agent solution：Villaumite parsing agent solution is sprayed on contaminated soil, makes contaminated soil water content
Close to saturation；
5th step, anaerobism maintenance：Two layers of LDPE antiseepage film is covered on contaminated soil surface, stabilization procedures is maintained at anaerobism ring
In border, and prevent from washing away, leaching, curing time is 7~15 days.
4. the lead-contaminated soil as described in claims 1 to 3 stabilizes restorative procedure, it is characterised in that：The pyridine dimethyl
The preparation method of the sepiolite of acidifying is specially：
The first step, sepiolite is placed in heating furnace, is warming up to 130 DEG C, is then maintained at a temperature of this 15 hours, eliminates Hai Pao
Moisture in stone surface and duct；
Second step, the sepiolite for eliminating moisture is put into rapidly in the solution equipped with pyridinedicarboxylic acid, the pyridine 2,6- diformazans
Acid is dissolved in water, and the concentration of solution is 20g/L~35g/L, stirring immersion 3~5 days.
5. the lead-contaminated soil as described in Claims 1-4 stabilizes restorative procedure, it is characterised in that：The tripolyphosphate
For sodium tripolyphosphate, tripolyphosphate magnesium.
6. the lead-contaminated soil as described in claim 1 to 5 stabilizes restorative procedure, it is characterised in that：The pyridinedicarboxylic acid
For pyridine 2,6- dioctyl phthalate.
7. the lead-contaminated soil as described in claim 1 to 6 stabilizes restorative procedure, it is characterised in that：The soluble trimerization
Phosphate and high-specific surface area pyridinedicarboxylic acid modified meerschaum ratio are preferably 1: 9~3: 7.
8. the lead-contaminated soil as described in claim 1 to 7 stabilizes restorative procedure, it is characterised in that：The compound stabilizer
Dosage is the 2~10% of contaminated soil quality.
9. the lead-contaminated soil as described in claim 1 to 8 stabilizes restorative procedure, it is characterised in that：The soluble villaumite
It can be MgCl to parse agent2Or CaCl2Or two kinds of mixing.
10. the lead-contaminated soil as described in claim 1 to 9 stabilizes restorative procedure, it is characterised in that：The parsing agent configuration
Into the concentration of the aqueous solution be preferably 0.05~0.5% mass percent.
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