CN110343528A - The method repaired the medicament of chromium-polluted soil using Filling Principle and repair chromium-polluted soil using Filling Principle - Google Patents
The method repaired the medicament of chromium-polluted soil using Filling Principle and repair chromium-polluted soil using Filling Principle Download PDFInfo
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- CN110343528A CN110343528A CN201910628755.9A CN201910628755A CN110343528A CN 110343528 A CN110343528 A CN 110343528A CN 201910628755 A CN201910628755 A CN 201910628755A CN 110343528 A CN110343528 A CN 110343528A
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- soil
- aqueous solution
- chromium
- gelling agent
- stabilizer
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/02—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only
- C09K17/12—Water-soluble silicates, e.g. waterglass
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
Abstract
The invention belongs to technical field of soil remediation, and in particular to the method repaired the medicament of chromium-polluted soil using Filling Principle and repair chromium-polluted soil using Filling Principle.Medicament provided by the invention includes the gelling agent and stabilizer independently dispensed, and the gelling agent includes sodium metasilicate, and the stabilizer includes water-soluble ferrous salt.After repairing using above-mentioned medicament to chromium-polluted soil, chromium ion is not detected in soil body percolate, concentration is in 0.14mg/kg or less in acid leaching liquor.
Description
Technical field
The invention belongs to technical field of soil remediation, and in particular to using Filling Principle repair chromium-polluted soil medicament and
The method for repairing chromium-polluted soil using Filling Principle.
Background technique
There are many existing soil restoring technologies, can be divided into peripheral doses, chemical remediation and biological prosthetic three according to principle
Class, wherein peripheral doses include direct soil replacement method, thermalization method, vitrifying repairing method, electrode drive repairing method；Chemical remediation includes
Solidification-stabilizing method, elution method and oxidation-reduction method；It is biological prosthetic to include phytoremediation, microorganism remediation and bio combined repair
The technologies such as multiple.
Although above-mentioned restorative procedure can alleviate soil contamination problem to a certain extent, there are different journeys in governance process
The defect of degree, such as direct soil replacement method soil replacement works amount is big, and contaminated soil disposition is difficult, costly, is equivalent to and digs the eastern wall to repair the western one,
It is difficult to large-scale application；Thermalization method energy consumption is high, limits the application of the method；Vitrifying restorative procedure needs high temperature and pressure, equally
There are problems that energy consumption is high, higher cost；Electrode drive repairing method is only applicable to the higher soil of humidity, needs to expend a large amount of electricity
Can, higher cost, and there is certain risk.
Solidification-stabilization technology is to fix pollutant in pollution medium, is at chronic steady state, is more general
All over the quick control restorative procedure for being applied to heavy metal pollution of soil, have to various heavy combined contamination soil is handled simultaneously
Apparent advantage；The disadvantage is that treated, soil volume increases, and needs to remove rubble or underground obstacle before engineering construction, dirty
Dye object is difficult to be uniformly mixed with stabilizer；Elution technique is by water or aqueous solution, acid-base solution, complexing agent containing rinse aid
Or the eluents such as surfactant are injected into contaminated soil or deposit, a kind of reparation of elution and cleaning pollutant in soil
Method, the deficiency of this method are that eluent medicament is generally expensive, it is difficult to be promoted the use of, and project amount is big, there are secondary dirts
The risk of dye；Oxidationreduction technology is by adding chemical oxidizing agent, such as ozone, hydrogen peroxide, potassium permanganate into soil
Deng or reducing agent, such as SO2, FeO, gaseous state H2S etc. makes it occur to chemically react the mesh to realize purification soil with polluter
's.In general, chemical oxidization method is suitable for soil and groundwater simultaneously by the reparation of organic pollution, use scope is relatively narrow, expense
It is higher, medicament pollution risk is larger.
Biological restoration has the advantages of easy to operate, at low cost, few to environmental perturbation, not easily cause secondary pollution, but this
The repairing efficiency of kind method is long, and the requirement to repairing condition is more harsh, is easy to be influenced by external environment variation, and nothing
Method repairs heavy-metal contaminated soil.
To sum up, the generally existing economic cost of existing soil restoring technology or the excessively high problem of time cost, soil remediation
Technology improves there is still a need for further.
Summary of the invention
It is repaired the purpose of the present invention is to provide the medicament for repairing chromium-polluted soil using Filling Principle and using Filling Principle
The method of multiple chromium-polluted soil, medicament provided by the invention can react with soil particle, moisture and the chromium ion in soil, make
Medicament, soil particle and chromium ion solidification are integrated, and are realized filling, are solidified the purpose of chromium-polluted soil, and then reach reparation effect
Fruit.
To achieve the goals above, the invention provides the following technical scheme:
The present invention provides a kind of medicaments that chromium-polluted soil is repaired using Filling Principle, including the gelling agent independently dispensed
And stabilizer, the gelling agent include sodium metasilicate, the stabilizer includes water-soluble ferrous salt.
Preferably, the mass ratio of the gelling agent and stabilizer is 1:(1~1.5).
Preferably, the mass ratio of the gelling agent and stabilizer is 1:(1.1~1.4).
Preferably, the water-soluble ferrous salt includes one in ferrous sulfate, frerrous chloride, ferrous acetate and ferrous nitrate
Kind is several.
Preferably, the water-soluble ferrous salt is ferrous sulfate.
The present invention provides a kind of methods for repairing chromium-polluted soil using Filling Principle, comprising the following steps:
Gelling agent and stabilizer described in above-mentioned technical proposal are configured to aqueous solution respectively, obtain gelling agent aqueous solution and
Stabilizer aqueous solution；
The stabilizer aqueous solution and gelling agent aqueous solution are successively alternately injected in the soil of pollution of chromium, is conserved.
Preferably, the mass concentration of the gelling agent aqueous solution is 6~14%.
Preferably, the mass concentration of the stabilizer aqueous solution is 7~15%.
Preferably, when injection, the group of last time injection is divided into gelling agent aqueous solution.
Preferably, gelling agent aqueous solution and stabilizer aqueous solution injection total volume are the 25~60% of soil body volume.
The present invention provides a kind of medicaments that chromium-polluted soil is repaired using Filling Principle, including the gelling agent independently dispensed
And stabilizer, the gelling agent include sodium metasilicate, the stabilizer includes water-soluble ferrous salt.The present invention is by sodium metasilicate, water-soluble
Property ferrous salt be used in compounding, wherein water-soluble ferrous salt can be by hexavalent chrome reduction at relatively stable trivalent chromium, and gelling agent
Colloid and precipitating can be then formed, is filled in the gap between soil particle, the diffusion path of chromium ion is blocked, reaches and quickly repairs
The purpose of multiple chromium-polluted soil.Embodiment the result shows that, the present invention used in medicament stock be easily obtained, reduce soil remediation
Cost, filling, solidification effect are good, chromium ion are not detected after reparation in soil body percolate, chromium (sexavalence) concentration exists in acid leaching liquor
0.14mg/kg or less.
The present invention also provides a kind of filling restorative procedures of heavy-metal contaminated soil can be to dirt using above-mentioned medicament
The soil body of dye chromium ion is efficiently filled, and pack completeness reaches 95.49~99.21%, effectively inhibits heavy metal chromium ion
Diffusion plays protection land resource and groundwater resources.
Detailed description of the invention
Fig. 1 is soil body repairing effect device for testing structural schematic diagram provided by the invention；
In figure, 1, pharmacy jar；2, water pot is distilled；3, triple valve；4, banket column；5, liquid reception device is drenched；6, the method for sieve pore
It is blue；7, lid；8, triple valve；9, filtrate tank.
Specific embodiment
In the following detailed description, the chromium form in chromium-polluted soil of the present invention is those skilled in the art
Well known water soluble chromium.
The present invention provides a kind of medicaments that chromium-polluted soil is repaired using Filling Principle, including the gelling agent independently dispensed
And stabilizer, the gelling agent include sodium metasilicate, the stabilizer includes water-soluble ferrous salt.
The medicament provided by the invention that chromium-polluted soil is repaired using Filling Principle includes the gelling agent independently dispensed, described
Gelling agent includes sodium metasilicate.
The medicament provided by the invention for repairing chromium-polluted soil using Filling Principle includes independent packing stabilizer, described steady
Determining agent includes water-soluble ferrous salt, and the water solubility ferrous salt preferably includes ferrous sulfate, frerrous chloride, ferrous acetate and nitric acid
One or more of ferrous iron, more preferably ferrous sulfate.When water-soluble ferrous salt is the mixture of several components, the present invention
There is no particular/special requirement to the mass ratio of each component in the mixture.
In the present invention, the mass ratio of the gelling agent and stabilizer is preferably 1:(1~1.5), more preferably 1:(1.1
It~1.4) is further preferably, 1:(1.2~1.3).
Above-mentioned sodium metasilicate is used cooperatively by the present invention with ferrous salt, is inhibited the generation of hexavalent chromium using ferrous salt, is matched
The effect for closing the cementing and filling pore of sodium metasilicate, further suppresses the diffusion and infiltration of chromium ion, while improving pollution of chromium soil
The intensity and bearing capacity of earth.
The present invention provides a kind of methods for repairing chromium-polluted soil using Filling Principle, comprising the following steps:
Gelling agent and stabilizer described in above-mentioned technical proposal are configured to aqueous solution respectively, obtain gelling agent aqueous solution and
Stabilizer aqueous solution；
The stabilizer aqueous solution and gelling agent aqueous solution are successively alternately injected in the soil of pollution of chromium, is conserved.
Gelling agent and stabilizer described in above-mentioned technical proposal are configured to aqueous solution by the present invention respectively, obtain gelling agent water
Solution and stabilizer aqueous solution.In the present invention, the mass concentration of the gelling agent aqueous solution is preferably 6~14%；Further
, preferably controlled according to soil soil property:
For silt soil property, in the gelling agent aqueous solution, the mass concentration of sodium metasilicate is preferably 6~10%, more preferably
It is 7~9%；
For sand soil property, in the sodium silicate aqueous solution, the mass concentration of sodium metasilicate is preferably 8~14%, more preferably
It is 10~13%, is further preferably 11~12%.
In the present invention, the manner of formulation of the gelling agent aqueous solution preferably mixes sodium metasilicate and water, obtains after stirring
Gelling agent aqueous solution.
In the present invention, the mixing preferably carries out under agitation, and the speed of the stirring and time are preferably to obtain
It is advisable to finely dispersed mixed liquor.
In the present invention, the mass concentration of the stabilizer aqueous solution is preferably 7~15%, and preferably 7.5~13%, then
Preferably 8~12%, specifically, can be 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, 10%, 13% or 15%.
The present invention does not have particular/special requirement to the preparation method of the stabilizer aqueous solution, and stabilizer is mixed with water, makes steady
Determine agent dissolution.
After obtaining gelling agent aqueous solution and stabilizer aqueous solution, the present invention is water-soluble by the stabilizer aqueous solution and gelling agent
Liquid successively alternately injects in the soil of pollution of chromium, is conserved.The present invention contains chromium pollutant in the soil of the pollution of chromium
Measure no particular/special requirement, any soil body that need to be repaired by pollution of chromium.
In the present invention, when the gelling agent aqueous solution injects in batches, the batch preferably points 2~5 times, further preferably
It is 3~4 times, the gelling agent aqueous solution quality of every batch of can be equal, can not also wait；When injection, the group of last time injection
Divide preferably gelling agent aqueous solution.In the present invention, the stabilizer aqueous solution preferably injects in batches, and each injection rate can
It with equal, can not also wait, batch number is matched with gelling agent aqueous solution batch number, and last time injection group is made to be divided into glue
Solidifying agent aqueous solution.In the present invention, the component injected for the first time is preferably stabilizer aqueous solution.
By taking 2 injections of gelling agent aqueous solution point as an example, alternately injection of the present invention refers to first injection part 1 stabilizer water
Solution, being then injected into part 1 gelling agent aqueous solution is a circulation, reinjects remaining stabilizer aqueous solution, is then poured into surplus
Remaining gelling agent aqueous solution is completed alternately to inject.
In the present invention, when gelling agent aqueous solution and stabilizer the concentration of aqueous solution concentration by adopting the above technical scheme
When, the gelling agent aqueous solution and stabilizer aqueous solution injection total volume are preferably the 25~60% of soil body volume, more preferably
30~50%.Soil body volume of the present invention is about to be worth, and can be calculated by pollutant diffusion area with diffusion depth.
After injecting gelling agent aqueous solution and stabilizer aqueous solution, the present invention conserves the soil body of injection medicament, makes medicine
Particle reaction in the soil of agent and pollution of chromium generates precipitating and colloid, fills the gap in soil, blocks the propagation of chromium ion
Path, and then reach elimination pollution of chromium, the purpose of soil protection environment and groundwater environment.In the present invention, the maintenance
Time is preferably 5~7 days, and more preferably 6 days.
For the application effect for characterizing above-mentioned technical proposal, the present invention provides device as shown in Figure 1 and tests and examine:
In Fig. 1, the column 4 that bankets is placed vertically, for filling heavy-metal contaminated soil sample, the upper port and medicine of the column 4 that bankets
Agent tank 1 is connected with distillation water pot 2 by triple valve 3, and upper port is provided with the flange 6 and lid 7 of sieve pore；The column 4 that bankets
Lower port have leaching liquid receive container 5；Triple valve 8 receives container 5 for connecting the column 4 that bankets, filtrate tank 9 and leaching liquid.
The present invention also provides the application method of above-mentioned detection device, the application method is preferably included:
Pedotheque layer is layered in the column 4 that bankets, and successively tamped, it is then that the column 4 that bankets of filling soil sample is vertical
It is fixed；And the connecting components in the way of；
Communicating valve 3 is adjusted, makes to distill water pot 2 and 4 connected state of column that bankets；Adjust banket column 4 and leaching liquid reception device 5
For connected state；Distilled water is injected, filtering liquid is received, obtains initial infiltration liquid；
It is non-interconnected state between column 4 and leaching liquid reception device 5 that adjustment, which is banketed, and it is connected state that medicament, which fills 1 with the column 4 that bankets,
Partial gelation agent aqueous solution is injected into the column 4 that bankets, then partially stabilized dose of aqueous solution is injected into the column that bankets by pharmacy jar 1
In 4, then repeatedly the injection step of the injection step of gelling agent aqueous solution and stabilizer aqueous solution, last time inject gelling agent
Aqueous solution；After injection, the soil body is conserved；When maintenance, the lower valve of triple valve 8 is closed, side valve door is opened；
It adjusting and bankets column 4 and drench liquid reception device 5 for connected state, distillation water storage tank 2 is connected state with the column 4 that bankets,
It is injected into distilled water in the column 4 that bankets；The lower valve for adjusting triple valve 8 is opened, and side valve door is closed, and filtering liquid is collected, to repair
Penetrating fluid after multiple.
In the present invention, a huge sum of money in penetrating fluid after the regulation effect of the chromium-polluted soil preferably passes through pack completeness and repairs
Belong to content to be characterized.In the present invention, pack completeness is with permeameter before (fill before permeability-filling after permeability)/fill,
Soil body pack completeness > 95.49% after being repaired using medicament to chromium-polluted soil.
The present invention characterizes repairing effect preferably by infiltration coefficient, and the infiltration coefficient obtains by the following method:
Infiltration coefficient is tested to obtain by constant head permeability test.When testing as shown in Figure 1:, filling is cut in the column 4 that bankets
Face is S, and length is the sample of L, opens water valve, and water is made to flow through soil pattern from top to bottom, and from water outlet (column lower end of banketing
Mouthful) at be discharged.After head difference (△ h) and exudation flow (Q) are stablized, measurement is by flowing through soil pattern in certain time (t)
Water (V), then:
V=Qt=ν St；
According to Darcy's law, v=ki, then V=k (△ h/L) St, to obtain:
K=QL/ (S △ h)；
In above formula, v indicates seepage velocity, and k indicates that infiltration coefficient, i indicate hydraulic gradient, and Q indicates exudation flow, △ h table
Show head difference, L indicates soil body length.
In order to further illustrate the present invention, it is repaired with reference to the accompanying drawings and examples to provided by the invention using Filling Principle
The medicament of chromium-polluted soil and the method using Filling Principle reparation chromium-polluted soil are described in detail again, but cannot be by it
Be interpreted as limiting the scope of the present invention.
Embodiment 1
The filling of soil body test sample is carried out using one-dimensional Organic glass column, experimental provision is simulated as shown in Figure 1: in column specification
Diameter × length is 10cm × 20cm, and an equally distributed flange of sieve pore (internal diameter 0.2mm) is laid at column both ends, is then laid with one layer
Filter paper plays the role of water distribution uniformity and prevents anaerobic condition from revealing.Simulation column be disposed vertically, solution from simulation column upper end
Into lower end sets out the mouth of a river；Test medium is added portionwise from column bottom and successively tamps, to avoid occurring being layered non-uniform phenomenon.
The permeability that the pollution soil body is surveyed using above-mentioned apparatus, specifically (is derived from Xinxiang pollution of chromium for soil body sample to be measured
Place) 8 pillars are filled, 3 are used to survey original permeability, and 5 for surveying the permeability after chemicals treatment；Use distilled water as leaching
Filtering agent carries out leaching, surveys earth pillar permeability, and initial 50mL leachate is taken to detect its pollutant load；Ferrous sulfate is water-soluble
Liquid and sodium silicate aqueous solution successively alternately inject the soil body；Maintenance 7 days；The lower valve of triple valve 8 is closed during maintenance, and side valve door is beaten
It opens；Before permeability test, the lower valve of triple valve 8 is opened, and side valve door is closed；Permeability test is carried out after maintenance, and is detected
Pollutant concentration in its leachate.
Soil classifiction is measured using triaxial compression test, theoretical formula method is used according to soil classifiction index
Bearing capacity carries out shearing strength test to filling front and back soil body sample, observes the bearing capacity change before and after soil body sample treatment.
Soil is derived from Xinxiang pollution of chromium place, water content: 7.5%, particle composition: 0.5~0.25mm of partial size is accounted for
11.5%, what 0.25~0.075mm accounted for that 58.4%, 0.075~0.005mm accounts for 22.3%, < 0.005mm accounts for 7.8%, soil body Cr6+
Initial concentration is 816.25mg/kg, and the average value of original permeability is 483cm/d, Cr in initial percolate (leachate)6+Concentration
For 120.63mg/kg, initial soil bearing capacity is 125kPa.
Prepare sodium metasilicate mass concentration be 8%, the medicament that ferrous sulfate mass concentration is 10%, by ferrous sulfate aqueous solution
Successively alternately the injection soil body, concrete operations are as follows with sodium silicate aqueous solution: the ferrous sulfate solution of 1/12 earth pillar volume is first injected,
The sodium metasilicate for reinjecting 1/12 earth pillar volume, injects in turn, and sodium silicate aqueous solution injects 3 times, conserves 7 days under room temperature, measures it
Permeability is 14.6cm/d, is computed pack completeness and reaches 96.98%, Cr in leachate6+It is not detected, soil body Cr6+Concentration is
0.14mg/kg is lower than construction land soil risk screening value standard (GB36600-2018).
Cr VI in the soil body is surveyed using " alkali resolution atomic absorption spectrophotometry " (HJ 687-2014)
Examination.The concentration of Cr VI, test result are shown in Table 1 in the reparation of testing example 1~5 front and back soil body, leaching rate liquid.
The measurement of chromium leachate under acid condition: by mass ratio be 2:1 the concentrated sulfuric acid and concentrated nitric acid Compound mixed solution at pH
The digestion agent that value is 3.2 or so, is immersed in 20h in the digestion agent for the soil body after maintenance, then chromium in test gained pickling bath liquor
The concentration of ion (Cr VI) is surveyed using " solid waste Leaching leaching method sulfonitric method " (HJ/T299-2007)
Hexavalent chromium concentration.
It is 180kPa that its bearing capacity is calculated after over packing conserves.
Embodiment 2~5
Chromium ion contaminated soil is handled according to the method for embodiment 1, and dosage of each component is listed in Table 1 below.
Cr VI in the soil body is tested using atomic absorption spectrophotometry (HJ 687-2014).Test is real
Apply example 1~5 repair the front and back soil body, in leaching rate liquid Cr VI concentration.
Composition, dosage and its repairing effect of 1 Examples 1 to 5 medicament of table
By the test result of Examples 1 to 5 it is found that medicament provided by the invention is used for the reparation of chromium ion contaminated soil
When, soil can be filled, be solidified, increase soil body compactness, reduced the permeability in contaminated soil region, reduce chromium
Diffusion of the ion to other non-polluting regions or body of groundwater, and then achieved the effect that chromium ion in stable soil, thus
Realize the reparation and improvement to chromium ion contaminated soil.Soil after reparation earthing after processing, can plant conventional crop.
Antiacid, alkali and external force performance test are carried out to the soil body after Examples 1 to 5 maintenance, test result shows through acid
After aqueous slkali dipping, the content of chromium ion in the soil body is below construction land soil risk screening value standard (GB36600-
2018)；Under external force, there is different degrees of raising before conserving the bearing capacity relatively processing of the soil body, the compactness of the soil body does not occur bright
It is aobvious to change, illustrate after being repaired using medicament provided by the invention to chromium ion contaminated soil, it can be to acid, alkali and mechanical damage
Wound has good resistance, further illustrates medicament provided by the invention and filling method restorative procedure to environmental suitability
Good, this method is suitble to large-scale promotion to use.
By the content of above embodiments it is found that medicament provided by the invention and restorative procedure are in stabilisation, immobilization
On the basis of, the hole and crack of chromium-polluted soil are filled, blocking pollution migrating channels, and make soil in contaminated soil
Grain, renovation agent and heavy metal ion are cementing integral, are equivalent to multiple-protection, greatly reduce environmental risk, and external mechanical
Damage, acid, alkalinity or other mal-conditions are smaller on repairing effect of the present invention influence, and practicability is stronger.It is provided by the invention
Medicament stock is environmentally protective, and secondary environment risk is small；It is from a wealth of sources, reduce cost of material；It is right in situ in conjunction with filling method
Contaminated soil is handled, 1000 yuan/m of rehabilitation expense3Left and right, far below current reparation price；Preparation method and user
Method is simple, not the limitation in polluted soil region, particularly suitable for pollutant be easy to migrate pollution stratum, as powder soil horizon,
Silty sand ground, fine sand layer and middle layer of sand etc.；Curing time is short, reduces time cost；Soil is after earthing is handled after reparation, still
Can long-term cropping, improve the utilization rate of the soil body.
Although above-described embodiment is made that detailed description to the present invention, it is only a part of the embodiment of the present invention,
Rather than whole embodiments, people can also obtain other embodiments under the premise of without creativeness according to the present embodiment, these
Embodiment belongs to the scope of the present invention.
Claims (10)
1. a kind of medicament for repairing chromium-polluted soil using Filling Principle, described including the gelling agent and stabilizer independently dispensed
Gelling agent includes sodium metasilicate, and the stabilizer includes water-soluble ferrous salt.
2. medicament as described in claim 1, which is characterized in that the mass ratio of the gelling agent and stabilizer be 1:(1~
1.5)。
3. medicament as claimed in claim 2, which is characterized in that the mass ratio of the gelling agent and stabilizer be 1:(1.1~
1.4)。
4. medicament as described in claim 1, which is characterized in that it is described water solubility ferrous salt include ferrous sulfate, frerrous chloride,
One or more of ferrous acetate and ferrous nitrate.
5. medicament as claimed in claim 4, which is characterized in that the water solubility ferrous salt is ferrous sulfate.
6. a kind of method for repairing chromium-polluted soil using Filling Principle, comprising the following steps:
The described in any item gelling agents of Claims 1 to 5 and stabilizer are configured to aqueous solution respectively, obtain gelling agent aqueous solution
With stabilizer aqueous solution；
The stabilizer aqueous solution and gelling agent aqueous solution are successively alternately injected in the soil of pollution of chromium, is conserved.
7. method as claimed in claim 6, which is characterized in that the mass concentration of the gelling agent aqueous solution is 6~14%.
8. method according to claim 6 or 7, which is characterized in that the mass concentration of the stabilizer aqueous solution be 7~
15%.
9. method as claimed in claim 6, which is characterized in that when injection, it is water-soluble that the group of last time injection is divided into gelling agent
Liquid.
10. the method as described in claim 6 or 9, which is characterized in that gelling agent aqueous solution and the injection of stabilizer aqueous solution are overall
Product is the 25~60% of soil body volume.
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| CN114147060A (en) * | 2021-11-29 | 2022-03-08 | 四川佳士特环境检测有限公司 | Restoration method of hexavalent chromium contaminated soil |
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