CN110434165A - The restorative procedure of places polluted by polynuclear aromatic hydrocarbons and application - Google Patents
The restorative procedure of places polluted by polynuclear aromatic hydrocarbons and application Download PDFInfo
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- CN110434165A CN110434165A CN201910705782.1A CN201910705782A CN110434165A CN 110434165 A CN110434165 A CN 110434165A CN 201910705782 A CN201910705782 A CN 201910705782A CN 110434165 A CN110434165 A CN 110434165A
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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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Abstract
The present invention discloses restorative procedure and the application of a kind of places polluted by polynuclear aromatic hydrocarbons, it is related to technical field of soil remediation, repairing effect can effectively be played, reduce benzo (a) anthracene, benzo (b) fluoranthene, benzo (a) pyrene, indeno (1 in soil, 2,3-cd) pollution of the multiring aromatic hydrocarbon substances such as pyrene and dibenzo (a, h) anthracene, meet the requirement of soil remediation, realizes the beneficial effect of environmental improvement and reparation.The present invention provides a kind of restorative procedure of places polluted by polynuclear aromatic hydrocarbons, will repair medicament and is applied in contaminated soil, adjusts soil moisture content, stack after being sufficiently stirred.The pollution risk in place effectively can be eliminated or be controlled by this method, it is ensured that the health of future recipient is not compromised after Site development.Of the invention used medicament of repairing is the substance being easy to get, at low cost, implementation easy to operate, administers that the period is shorter and significant effect, is easy to engineer application, can effectively realize economic benefit, environmental benefit and social benefit.
Description
Technical field
The present invention relates to technical field of soil remediation, restorative procedure in particular to places polluted by polynuclear aromatic hydrocarbons and
Using.
Background technique
Polycyclic aromatic hydrocarbon is the general name of a substance, is largely colourless or flaxen crystallization, and individual tools are dark, mostly not
It is dissolved in water, is soluble in benzene Solarium lycopersicoide solvent, is slightly soluble in other organic solvents, octanol-water partition coefficient is relatively high, has
" three cause " (carcinogenic, teratogenesis, mutagenesis) effect and stronger bioaccumulation.
Certain place was tire production factory originally, investigates and finds through space enrironment, had benzo (a) anthracene, benzo (b) glimmering in place
5 kinds of polycyclic aromatic hydrocarbons such as anthracene, benzo (a) pyrene, indeno (1,2,3-cd) pyrene and dibenzo (a, h) anthracene are more than that " soil environment quality is built
If land used soil pollution risk management and control standard " respective standard value in (GB36600-2018), exceeded depth is concentrated mainly on miscellaneous fill out
Soil and plain fill layer (maximum exceeded depth be no more than 3.4m), maximum times of ultra standard is respectively 1.24 times, 1.20 times, 17.90 times,
0.13 times, 2.98 times need to carry out pollution amelioration.The target value accordingly repaired be respectively 5.5mg/kg, 5.5mg/kg,
0.55mg/kg,5.5mg/kg,0.55mg/kg.Soil remediation range about 8047.31m2, repairing earth volume is about 21484.07m3。
Soil remediation area is larger in the place, and the range for needing to repair is larger, and earth volume is more, and pollutant kind
More, exceeded situation is more serious.Therefore.It needs those skilled in the art and studies a kind of suitable recovery technique, can effectively repair
The pollution of above-mentioned five classes multiring aromatic hydrocarbon substance in earth backing earth, makes respective substance in final soil reach reparation target value.
In view of this, the present invention is specifically proposed.
Summary of the invention
The first purpose of this invention is to provide a kind of soil remediation method of places polluted by polynuclear aromatic hydrocarbons, to solve to drop
Benzo (a) anthracene, benzo (b) fluoranthene, benzo (a) pyrene, indeno (1,2,3-cd) pyrene and dibenzo (a, h) in low industrial sites soil
The pollution of five class multiring aromatic hydrocarbon substance of anthracene makes respective substance concentration in final soil reach the technical issues of repairing target value.
Second object of the present invention is that the soil remediation method for providing places polluted by polynuclear aromatic hydrocarbons of the present invention is being repaired
Application in engineering, can effectively play repairing effect, reduce benzo (a) anthracene in soil, benzo (b) fluoranthene, benzo (a) pyrene,
The pollution of the multiring aromatic hydrocarbon substances such as indeno (1,2,3-cd) pyrene and dibenzo (a, h) anthracene, meets the requirement of soil remediation, realizes
The beneficial effect of environmental improvement and reparation.
In order to realize above-mentioned purpose of the invention, the following technical scheme is adopted:
The present invention provides a kind of restorative procedure of places polluted by polynuclear aromatic hydrocarbons, will repair medicament and is applied in contaminated soil,
Soil moisture content is adjusted, is stacked after being sufficiently stirred.
Optionally, in the restorative procedure of places polluted by polynuclear aromatic hydrocarbons of the present invention, repairing medicament includes alkali activator
And persulfate.
Optionally, in the restorative procedure of places polluted by polynuclear aromatic hydrocarbons of the present invention, the alkali activator includes liquid
Alkali, potassium hydroxide；The persulfate includes sodium peroxydisulfate, potassium peroxydisulfate.
Optionally, in the restorative procedure of places polluted by polynuclear aromatic hydrocarbons of the present invention, the alkali activator it is typical but
It is non-limiting be 10% liquid alkaline of mass concentration, the persulfate it is typical but it is non-limiting be 25% sodium peroxydisulfate of mass concentration；
The persulfate adding than for 0.8%~3% (mass percent), the persulfate and the alkalinity are living in the soil
The ratio that adds of agent is 1: 0.6.
It is added in the soil with persulfate than being 1%, persulfate and alkali activator add ratio as 1: 0.6 and be
Example that is, in 1t pedotheque, will be added persulfate 10kg, alkali activator 6kg be added, then be converted into corresponding mass concentration
The quality of persulfate or alkali activator.Other the rest may be inferred, repeats no more.
Optionally, 25% persulfate add in the soil than it is typical but it is non-limiting be 0.8%, 1.0%, 1.2%,
1.5%, 2.0%, 2.5% or 3.0%.
Preferably, in the restorative procedure of places polluted by polynuclear aromatic hydrocarbons of the present invention, the throwing of 25% persulfate
Add than being 1%~2%.
Optionally, in the restorative procedure of places polluted by polynuclear aromatic hydrocarbons of the present invention, the soil moisture content is 25%
~35%.
Optionally, it is 25% that soil moisture content is typical but non-limiting, 26%, 27%, 28%, 29%, 30%, 31%,
32%, 33%, 34%, 35%.
Specifically, the contaminated soil dug out first can be subjected to screening process, removal construction of structures rubbish, brick or tree root
Equal sundries, adjustment soil moisture content is 25%-35% after medicament is repaired in sprinkling, and is sufficiently stirred.
Optionally, in the restorative procedure of places polluted by polynuclear aromatic hydrocarbons of the present invention, the time stacked after stirring is 8-
15 days.
Optionally, it is 8 days that the time stacked after stirring is typical but non-limiting, 9 days, 10 days, 11 days, 12 days, 13 days, 14
It or 15 days.
Optionally, the restorative procedure of places polluted by polynuclear aromatic hydrocarbons of the present invention, includes the following steps:
(1) contaminated soil of fixed mass is dug out and is placed in greenhouse, greenhouse ground making cement hardens and is laid with antiseepage
Film；(2) liquid alkaline of mass concentration 10% is added into contaminated soil, is added by 1%~2% than adding further according to contaminated soil quality
Enter the sodium peroxydisulfate of mass concentration 25%, the ratio that adds of sodium peroxydisulfate and liquid alkaline is 1: 0.6；(3) adjustment soil moisture content is
25%-30%；(4) it is stacked 8-15 days after being sufficiently stirred.
The present invention also provides application of the above-mentioned restorative procedure in improvement place soil is polycyclic aromatic hydrocarbons contaminated.
Compared with prior art, the invention has the benefit that
(1) restorative procedure of places polluted by polynuclear aromatic hydrocarbons of the present invention, it is living by the way that reparation medicament alkalinity is added to contaminated soil
Agent and persulfate, and soil moisture content is adjusted, it is abundant to can effectively ensure that the pollutant repaired in medicament and soil carries out
Reaction, thus reduce benzo (a) anthracene in industrial sites soil, benzo (b) fluoranthene, benzo (a) pyrene, indeno (1,2,3-cd) pyrene and
The pollution of the multiring aromatic hydrocarbon substances such as dibenzo (a, h) anthracene makes respective substance concentration in final soil reach reparation target value.It should
The pollution risk in place effectively can be eliminated or be controlled by method, it is ensured that after Site development future recipient health not by
To harm.Medicament used of repairing of the invention is the substance being easy to get, and it is shorter to administer the period at low cost, implementation easy to operate
And significant effect, and it is easy to engineer application, it can effectively realize economic benefit, environmental benefit and social benefit.
(2) present invention provides a kind of application of the soil remediation method of places polluted by polynuclear aromatic hydrocarbons in recovery project, energy
It is enough effectively to play repairing effect, reduce benzo (a) anthracene, benzo (b) fluoranthene, benzo (a) pyrene, indeno (1,2,3-cd) pyrene in soil
With the pollution of the multiring aromatic hydrocarbon substances such as dibenzo (a, h) anthracene, meet the requirement of soil remediation, realize environmental improvement and repairs
Beneficial effect.
Specific embodiment
Embodiment of the present invention is described in detail below in conjunction with embodiments and examples, but this field skill
Art personnel will be understood that following embodiments and embodiment are merely to illustrate the present invention, and are not construed as limiting model of the invention
It encloses.The person that is not specified actual conditions in embodiment, carries out according to conventional conditions or manufacturer's recommended conditions.Agents useful for same or instrument
Production firm person is not specified in device, is the conventional products that can be obtained by commercially available purchase.
Soil pollution repairs target and generally includes versatility target and the management objectives based on Site characteristic.Wherein, general
Property target refer to by formulating and implementing corresponding management game so that repair after soil quality reach corresponding quality standard or
Pollutant concentration is set to be reduced to background concn or less.Management objectives based on Site characteristic mainly comprehensively consider specific place
Land use, sensitive receptors, crucial route of exposure, place hydrogeologic condition, basic risk evaluation result, is repaired at the extent of injury
The factors such as recovering technology development degree, rehabilitation cost, the corresponding management strategy of the formulation of adaptation to local conditions are simultaneously implemented, it is ensured that corresponding management
Pollutant after strategy implement in soil will not influence the specific of place and use function, not cause to human health and Environmental security
Unacceptable harm.
The reparation target of place soil pollution of the present invention be in conjunction with specific distribution of the pollutant in place, Profiling for Soil Lithology,
Pollutant characteristic, place hydrogeologic condition etc. are polluted PAHs by means such as source removing, Engineering Control or system controls
The health risk control of object (repairs target value, according to " soil environment quality construction land soil pollution risk in acceptable level
Control standard (tentative) " (GB36600-2018) first kind land used screening value determines), to ensure the health of receptor after Site development
Risk is no more than acceptable risk level.
According to an aspect of the present invention, embodiment of the present invention provides a kind of reparation side of places polluted by polynuclear aromatic hydrocarbons
Method will be repaired medicament and be applied in contaminated soil, adjusts soil moisture content, stack after being sufficiently stirred.
Specifically, in the restorative procedure that embodiment of the present invention provides, it is thus necessary to determine that the quality of contaminated soil, by Polluted Soil
Earth is placed in closed greenhouse by digging out in place, and greenhouse ground making cement hardens and be laid with antiseepage film, and contaminated soil is placed on
Subsequent application is carried out in antiseepage film again and repairs the processing such as medicament and stirring.
Since medicine soil mixed process carries out in closed greenhouse, will be mixed by the barrier action of greenhouse wall and surface sealing
It closes the dust generated in stirring to be limited in greenhouse, medicine soil hybrid technique operation bring environmental hazard can be efficiently reduced.
Compared with prior art, the beneficial effect of the restorative procedure for the places polluted by polynuclear aromatic hydrocarbons that embodiment of the present invention provides
Fruit are as follows:
The restorative procedure for the places polluted by polynuclear aromatic hydrocarbons that embodiment of the present invention provides is repaired by being added to contaminated soil
Medicament alkali activator and persulfate, and soil moisture content is adjusted, it can effectively ensure that the pollution repaired in medicament and soil
Object is sufficiently reacted, thus reduce benzo (a) anthracene in industrial sites soil, benzo (b) fluoranthene, benzo (a) pyrene, indeno (1,
2,3-cd) pollution of the multiring aromatic hydrocarbon substances such as pyrene and dibenzo (a, h) anthracene reaches respective substance concentration and repairs
Complicated target value.The pollution risk in place effectively can be eliminated or be controlled by this method, it is ensured that after Site development future by
The health of body is not compromised.Medicament used of repairing of the invention is the substance being easy to get, at low cost, implementation easy to operate,
It administers that the period is shorter and significant effect, and is easy to engineer application, can effectively realize economic benefit, environmental benefit and society's effect
Benefit.
Optionally, in the restorative procedure for the places polluted by polynuclear aromatic hydrocarbons that embodiment of the present invention provides, repairing medicament includes
Alkali activator and persulfate.
In the present invention, the purpose of alkali activator is to be in soil environment in the environment of pH 9-11, is activated by alkali
It can guarantee that persulfate realizes preferable oxidation effectiveness.
The present invention uses persulfate to repair medicament, and the oxidation duration is long, generates CO with pollutant reaction2
And H2O influences soil property small without other poisonous and harmful intermediate products.
Optionally, in the restorative procedure for the places polluted by polynuclear aromatic hydrocarbons that embodiment of the present invention provides, alkali activator packet
Include liquid alkaline, potassium hydroxide；Persulfate includes sodium peroxydisulfate, potassium peroxydisulfate.
Optionally, in the restorative procedure for the places polluted by polynuclear aromatic hydrocarbons that embodiment of the present invention provides, alkali activator is
The liquid alkaline of mass concentration 10%, persulfate are 25% sodium peroxydisulfate of mass concentration, persulfate adding than (matter in the soil
Percentage is measured, similarly hereinafter) it is 0.8%~3%, the ratio that adds of persulfate and alkali activator is 1: 0.6.
It is added in the soil with persulfate than being 1%, persulfate and alkali activator add ratio as 1: 0.6 and be
Example that is, in 1t pedotheque, will be added persulfate 10kg, alkali activator 6kg be added, then be converted into corresponding mass concentration
The quality of persulfate or alkali activator.Other the rest may be inferred, repeats no more.
Optionally, alkali activator is typical but non-limiting for the liquid alkaline of mass concentration 10% or the hydrogen of mass concentration 10%
Potassium oxide；Persulfate is typical but non-limiting for 25% sodium peroxydisulfate of mass concentration or the potassium peroxydisulfate of mass concentration 25%；
Persulfate adding than (mass percent, similarly hereinafter) in the soil is 0.8%~3%, persulfate and alkali activator
Adding ratio is 1: 0.6.
Optionally, 25% persulfate add in the soil than it is typical but it is non-limiting be 0.8%, 1.0%, 1.2%,
1.5%, 2.0%, 2.5% or 3.0%.
Preferably, in the restorative procedure for the places polluted by polynuclear aromatic hydrocarbons that embodiment of the present invention provides, 25% persulfate
Add than being 1%~2%.
Optionally, in the restorative procedure for the places polluted by polynuclear aromatic hydrocarbons that embodiment of the present invention provides, soil moisture content is
25%~35%.
Optionally, it is 25% that soil moisture content is typical but non-limiting, 26%, 27%, 28%, 29%, 30%, 31%,
32%, 33%, 34%, 35%.
Specifically, the contaminated soil dug out first can be subjected to screening process, removal construction of structures rubbish, brick or tree root
Equal sundries, adjustment soil moisture content is 25%-35% after medicament is repaired in sprinkling, and is sufficiently stirred.Or according to soil
Quality first calculates the quality for repairing medicament and water for needing to apply, and is made into persulfate solution according to calculated result, directly applies
Repair liquid medicine.
It can be come into full contact with repairing by the fine grained contaminated soil after screening process, be conducive to chemical oxidation reaction
Progress.
By adjusting suitable soil moisture content, it can be further ensured that pollutant in soil reacts effect with repair medicament
Fruit improves the removal rate of pollutant.
It, can be by the way that dedicated scraper bowl be mixed by the contaminated soil after screening and repairs medicament not in actual repair engineering
It is disconnected to be mixed.Mound (known soil quality) can be directly sprayed onto for alkali activator, stirred by mixing, then make
The mixed liquor of the oxidating chemicals being calculated early period and water is quantitatively added to Polluted Soil with the spray appliance for loading persulfate
In earth, then passes through to keep stirring and be uniformly mixed reparation medicament.It can guarantee that soil moisture content meets the requirements simultaneously.
Optionally, it in the restorative procedure for the places polluted by polynuclear aromatic hydrocarbons that embodiment of the present invention provides, is stacked after stirring
Time is 8-15 days.
It, specific curing cycle, can be by field technician according to the sampling of pollution situation and maintenance processes in Practical Project
Testing result carries out appropriate adjustment, and minimum curing cycle must not be less than 8d, to ensure reaction effect.
Optionally, the restorative procedure for the places polluted by polynuclear aromatic hydrocarbons that embodiment of the present invention provides, includes the following steps:
(1) contaminated soil of fixed mass is dug out and is placed in greenhouse, greenhouse ground making cement hardens and is laid with antiseepage
Film；(2) liquid alkaline of mass concentration 10% is added into contaminated soil, is added by 1%~2% than adding further according to contaminated soil quality
Enter the sodium peroxydisulfate of mass concentration 25%, the ratio that adds of sodium peroxydisulfate and liquid alkaline is 1: 0.6；(3) adjustment soil moisture content is
25%-30%；(4) it is stacked 8-15 days after being sufficiently stirred.
Compared with prior art, the beneficial effect of the restorative procedure for the places polluted by polynuclear aromatic hydrocarbons that embodiment of the present invention provides
Fruit are as follows:
The restorative procedure for the places polluted by polynuclear aromatic hydrocarbons that embodiment of the present invention provides, being obtained by calculation need to be to be added
The amount of the sodium peroxydisulfate of the liquid alkaline and mass concentration 25% of mass concentration 10% is added tie substance to contaminated soil, and adjusts
Soil moisture content 25%-30% can effectively ensure that repair medicament is sufficiently reacted with the pollutant in soil, to reduce
Benzo (a) anthracene, benzo (b) fluoranthene, benzo (a) pyrene, indeno (1,2,3-cd) pyrene and dibenzo (a, h) anthracene in industrial sites soil
The pollution of equal multiring aromatic hydrocarbon substances, makes respective substance concentration in final soil reach reparation target value.This method can be by field
The pollution risk on ground is effectively eliminated or is controlled, it is ensured that the health of future recipient is not compromised after Site development.This hair
The reparations medicament that bright embodiment provides is the substance being easy to get, at low cost, implementation easy to operate, the improvement period it is shorter and
Significant effect, and it is easy to engineer application, it can effectively realize economic benefit, environmental benefit and social benefit.
According to another aspect of the present invention, embodiment of the present invention also provides above-mentioned restorative procedure and is administering place soil
Application in polycyclic aromatic hydrocarbons contaminated.
Application of the soil remediation method for the places polluted by polynuclear aromatic hydrocarbons that embodiment of the present invention provides in recovery project,
Repairing effect can be effectively played, benzo (a) anthracene, benzo (b) fluoranthene, benzo (a) pyrene, indeno (1,2,3-cd) in soil are reduced
The pollution of the multiring aromatic hydrocarbon substances such as pyrene and dibenzo (a, h) anthracene meets the requirement of soil remediation, realizes environmental improvement and reparation
Beneficial effect.
The soil remediation method of places polluted by polynuclear aromatic hydrocarbons of the present invention is carried out below with reference to specific comparative example and embodiment
It is described in detail.
Uniformly distributed 10 representative test points in certain contaminated sites region, each usage mining machine excavate
Existing hardened ground in contaminated soil scraper to field is mixed, soil sample is carried out screening process, sifts out building by the equivalent earthwork
Rubbish and house refuse, residual contamination soil be sufficiently mixed uniformly as soil sample, are used for the embodiment of the present invention and comparative example
Test uses, and every group of quality of soil sample is 2t, and every group is done 3 in parallel.
The concentration of target contaminant before treatment in soil sample is detected, benzo (a) anthracene concentration is 12.30mg/kg, benzo (b)
Fluoranthene concentration is 5.60mg/kg, benzo (a) pyrene concentration is 5.30mg/kg, indeno (1,2,3-cd) pyrene concentration is 6.22mg/kg
It is 1.17mg/kg with dibenzo (a, h) anthracene concentration.
Embodiment 1:
Take one group of soil sample, first be added mass concentration 10% liquid alkaline, stir evenly, according still further to soil add than for
25% sodium peroxydisulfate of mass concentration is added in 0.8% (mass fraction), guarantees that the ratio that adds of sodium peroxydisulfate and liquid alkaline is 1: 0.6,
Then adjusting soil moisture content is 35%, and is stirred, and maintenance 8 days is stacked.
Embodiment 2:
One group of soil sample is taken, the liquid alkaline of mass concentration 10% is first added, stirs evenly, adds according still further to soil than being 1%
25% sodium peroxydisulfate of mass concentration is added in (mass fraction), guarantees that the ratio that adds of sodium peroxydisulfate and liquid alkaline is 1: 0.6, then adjusts
Saving soil moisture content is 30%, and is stirred, and maintenance 10 days is stacked.
Embodiment 3:
One group of soil sample is taken, the liquid alkaline of mass concentration 10% is first added, stirs evenly, adds according still further to soil than being 2%
25% sodium peroxydisulfate of mass concentration is added in (mass fraction), guarantees that the ratio that adds of sodium peroxydisulfate and liquid alkaline is 1: 0.6, then adjusts
Saving soil moisture content is 30%, and is stirred, and maintenance 12 days is stacked.
Embodiment 4:
Take one group of soil sample, first be added mass concentration 10% liquid alkaline, stir evenly, according still further to soil add than for
25% sodium peroxydisulfate of mass concentration is added in 1.2% (mass fraction), guarantees that the ratio that adds of sodium peroxydisulfate and liquid alkaline is 1: 0.6,
Then adjusting soil moisture content is 25%, and is stirred, and maintenance 8 days is stacked.
Embodiment 5:
Take one group of soil sample, first be added mass concentration 10% liquid alkaline, stir evenly, according still further to soil add than for
25% sodium peroxydisulfate of mass concentration is added in 2.5% (mass fraction), guarantees that the ratio that adds of sodium peroxydisulfate and liquid alkaline is 1: 0.6,
Then adjusting soil moisture content is 26%, and is stirred, and maintenance 15 days is stacked.
Embodiment 6:
Take one group of soil sample, first be added mass concentration 10% liquid alkaline, stir evenly, according still further to soil add than for
25% sodium peroxydisulfate of mass concentration is added in 3.0% (mass fraction), guarantees that the ratio that adds of sodium peroxydisulfate and liquid alkaline is 1: 0.6,
Then adjusting soil moisture content is 28%, and is stirred, and maintenance 15 days is stacked.
Embodiment 7:
One group of soil sample is taken, the potassium hydroxide solution of mass concentration 10% is first added, stirs evenly, is added according still further to soil
Than 25% sodium peroxydisulfate of mass concentration is added for 1% (mass fraction), guarantee that the ratio that adds of sodium peroxydisulfate and potassium hydroxide is 1
: 0.6, then adjusting soil moisture content is 30%, and is stirred, and maintenance 10 days is stacked.
Embodiment 8:
One group of soil sample is taken, the sodium hydroxide solution of mass concentration 10% is first added, stirs evenly, is added according still further to soil
Than 25% potassium peroxydisulfate of mass concentration is added for 1% (mass fraction), guarantee that the ratio that adds of potassium peroxydisulfate and sodium hydroxide is 1
: 0.6, then adjusting soil moisture content is 30%, and is stirred, and maintenance 10 days is stacked.
Comparative example 1:
Take one group of soil sample, first be added mass concentration 10% liquid alkaline, stir evenly, according still further to soil add than for
25% sodium peroxydisulfate of mass concentration is added in 0.5% (mass fraction), guarantees that the ratio that adds of sodium peroxydisulfate and liquid alkaline is 1: 0.6,
Then adjusting soil moisture content is 30%, and is stirred, and maintenance 12 days is stacked.
Comparative example 2:
Take one group of soil sample, first be added mass concentration 10% liquid alkaline, stir evenly, according still further to soil add than for
25% sodium peroxydisulfate of mass concentration is added in 3.5% (mass fraction), guarantees that the ratio that adds of sodium peroxydisulfate and liquid alkaline is 1: 0.6,
Then adjusting soil moisture content is 30%, and is stirred, and maintenance 12 days is stacked.
Comparative example 3:
One group of soil sample is taken, the liquid alkaline of mass concentration 10% is first added, stirs evenly, adds according still further to soil than being 2%
25% sodium peroxydisulfate of mass concentration is added in (mass fraction), guarantees that the ratio that adds of sodium peroxydisulfate and liquid alkaline is 1: 0.6, then adjusts
Saving soil moisture content is 15%, and is stirred, and maintenance 8 days is stacked.
Comparative example 4:
One group of soil sample is taken, the liquid alkaline of mass concentration 10% is first added, stirs evenly, adds according still further to soil than being 2%
25% sodium peroxydisulfate of mass concentration is added in (mass fraction), guarantees that the ratio that adds of sodium peroxydisulfate and liquid alkaline is 1: 0.1, then adjusts
Saving soil moisture content is 30%, and is stirred, and maintenance 8 days is stacked.
Comparative example 5:
One group of soil sample is taken, according to the liquid alkaline that mass concentration 10% is added than 1.2% is added to soil, is stirred evenly, then
Adjusting soil moisture content is 30%, and is stirred, and maintenance 8 days is stacked.
Experimental result and analysis
The soil sample of embodiment 1-8 and comparative example 1-5 before and after the processing is detected, benzo in soil before and after the processing is measured
(a) concentration of anthracene, benzo (b) fluoranthene, benzo (a) pyrene, indeno (1,2,3-cd) pyrene and dibenzo (a, h) anthracene.Each group before handling
Simultaneously (a) anthracene concentration is 12.30mg/kg in soil, and benzo (b) fluoranthene concentration is 5.60mg/kg, and benzo (a) pyrene concentration is
5.30mg/kg, indeno (1,2,3-cd) pyrene concentration are 6.22mg/kg, and dibenzo (a, h) anthracene concentration is 1.17mg/kg.Repair place
The results are shown in Table 1 after reason.
1 testing result of table
As shown in Table 1, embodiment 1-8 realizes preferable removal rate to target contaminant, plays preferable repair and imitates
Fruit reaches reparation target.Wherein, the effect of embodiment 3 is best, and embodiment 7 and embodiment 8 and 3 effect of embodiment are closest.
Compared with comparative example 1 and comparative example 2, what sodium peroxydisulfate was added in embodiment 3 is suitable for that the sodium peroxydisulfate that comparative example 1 is added is relatively low, oxygen
It is poor to change effect, it is up to standard to cannot achieve total material；Comparative example 2 be added sodium peroxydisulfate it is higher, although repairing effect with reality
It is close to apply example 3, but will cause oxidating chemicals waste, causes rehabilitation cost higher, does not meet green economy, energy-saving and environment-friendly wants
It asks.Compared with comparative example 4, embodiment 3 joined the alkali activator of appropriate amount, and the amount of alkali activator is added in comparative example 4
It is relatively low, suitable condition can not be created for oxidating chemicals reaction, the removal effect of pollutant is poor, not up to reparation target.With
Comparative example 5 is compared, and embodiment 3 joined the oxidating chemicals of appropriate amount, and oxidating chemicals are not added in comparative example 5, cannot achieve pair
The oxidation effectiveness of pollutant, each substance not up to repair target.
Compared with comparative example 1-5, embodiment 1-8 can be effectively reduced the concentration of target contaminant in soil (far below repairing
Complicated target value), highest removal rate can be up to 95.7%.The method of the present invention the pollution risk in place can effectively be eliminated or
Control, it is ensured that the health of future recipient is not compromised after Site development.The reparation medicament that the method for the present invention provides is easy
The substance of acquisition, at low cost, implementation easy to operate administers that the period is shorter and significant effect, and is easy to engineer application, can be effective
Realize economic benefit, environmental benefit and social benefit.
Although illustrate and describing the present invention with specific embodiment, it will be appreciated that without departing substantially from of the invention
Many other change and modification can be made in the case where spirit and scope.It is, therefore, intended that in the following claims
Including belonging to all such changes and modifications in the scope of the invention.
Claims (9)
1. a kind of restorative procedure of places polluted by polynuclear aromatic hydrocarbons, which is characterized in that medicament will be repaired and be applied in contaminated soil, adjusted
Whole soil moisture content is stacked after being sufficiently stirred.
2. the restorative procedure of places polluted by polynuclear aromatic hydrocarbons according to claim 1, which is characterized in that the reparation medicament packet
Include alkali activator and persulfate.
3. the restorative procedure of places polluted by polynuclear aromatic hydrocarbons according to claim 1 or 2, which is characterized in that the alkalinity is living
Agent includes liquid alkaline, potassium hydroxide；The persulfate includes sodium peroxydisulfate, potassium peroxydisulfate.
4. the restorative procedure of places polluted by polynuclear aromatic hydrocarbons according to claim 3, which is characterized in that the alkali activator
It is 25% sodium peroxydisulfate of mass concentration for 10% liquid alkaline of mass concentration, the persulfate；
The persulfate is added to soil than being 0.8%~3%, and the persulfate is added with the alkali activator
Ratio is 1: 0.6.
5. the restorative procedure of places polluted by polynuclear aromatic hydrocarbons according to claim 4, which is characterized in that the persulfate
It adds than being 1%~2%.
6. the restorative procedure of places polluted by polynuclear aromatic hydrocarbons according to claim 4, which is characterized in that the soil moisture content
It is 25%~35%.
7. the restorative procedure of places polluted by polynuclear aromatic hydrocarbons according to claim 6, which is characterized in that stacked after stirring when
Between be 8-15 days.
8. the restorative procedure of places polluted by polynuclear aromatic hydrocarbons according to claim 7, which comprises the steps of:
(1) contaminated soil of fixed mass is dug out and is placed in greenhouse, greenhouse ground making cement hardens and is laid with antiseepage film；
(2) liquid alkaline of mass concentration 10% is added into contaminated soil, is added by 1%~2% than being added further according to contaminated soil quality
The ratio that adds of the sodium peroxydisulfate of mass concentration 25%, sodium peroxydisulfate and liquid alkaline is 1: 0.6；(3) adjustment soil moisture content is
25%-35%；(4) it is stacked 8-15 days after being sufficiently stirred.
9. application of the described in any item methods of claim 1-8 in improvement place soil is polycyclic aromatic hydrocarbons contaminated.
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