CN109759427A - The restorative procedure of PAHs contaminated soil - Google Patents
The restorative procedure of PAHs contaminated soil Download PDFInfo
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- CN109759427A CN109759427A CN201910071138.3A CN201910071138A CN109759427A CN 109759427 A CN109759427 A CN 109759427A CN 201910071138 A CN201910071138 A CN 201910071138A CN 109759427 A CN109759427 A CN 109759427A
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Abstract
The present invention provides a kind of restorative procedures of PAHs contaminated soil, this method first carries out after turning over processing for the first time contaminated soil, it is stood after adding photochemical catalyst into soil, then first time elution processing is carried out with the first eluent after soil being turned over for the second time, second of elution processing is carried out with the second eluent after soil third time is turned over again, finally detect soil in PAHs concentration, repeat it is aforementioned to testing result be BaP content be less than 0.1mg/kg, luxuriant and rich with fragrance content be less than 1.0mg/kg.The PAHs in contaminated soil can be effectively reduced in the restorative procedure of PAHs contaminated soil provided by the invention, and treatment effeciency is high, speed is fast, at low cost.
Description
Technical field
The invention belongs to remediation contaminated soil technical fields, and in particular to the restorative procedure of PAHs contaminated soil.
Background technique
It after soil pollution refers to that the pollutant that mankind's activity generates enters soil, is accumulated in soil environment, when harmful in soil
Substance is excessive, is more than that composition of the soil, structure and function will be caused to change, microbial activities after soil self purification activity
It is suppressed, harmful substance or its decomposition product generate harm to human health, animals and plants, air, water body, this to endanger phenomenon
It is embodied in the variation of not isoacceptor, which is known as soil pollution.There are following characteristics for soil pollution: (1) hidden
Property and hysteresis quality, atmosphere pollution and water pollution can find that and soil pollution is often wanted by sense organ when reaching a certain level
It could certainty through the influence research of network analysis, farming analyte detection, even human and livestock health by representational pedotheque
Matter；(2) cumulative bad and regional, compared with atmosphere, water body, pollutant is more difficult to migrate in the soil, spreads and dilute for soil pollution
It releases, therefore is easy constantly to accumulate in the soil and reach very high concentration, at the same time, also have Soil Environmental Pollution very strong
Typical regional characters；(3) irreversibility, if atmosphere and water body are contaminated, cut off after pollution sources through diluting effect and
Self purification is it is also possible that pollution problem constantly reverses, but the Recalcitrant chemicals being accumulated in contaminated soil environment are then very
Hardly possible is eliminated by diluting effect and self purification；(4) administer that difficult and period is long, and soil pollution relies solely on cutting once occurring
The method of pollution sources is difficult to repair.
Polycyclic aromatic hydrocarbon (Polycyclic Aromatic Hydrocarbons, PAHs) be two or more phenyl ring with
The connected hydrocarbon compound of condensed ring form, has strong carcinogenic, teratogenesis, mutagenesis characteristic, and vapour pressure is small, octanol/water point
Distribution coefficient is high, and bioavailability is poor, is a kind of organic pollutant difficult to degrade.Strong adsorption of the PAHs on solid particle,
It is easily formed lasting contact scar, and is distributed widely in the surrounding mediums such as big gas and water, soil, wherein soil, which is the largest, collects
Area.The source PAHs in surrounding medium is broadly divided into natural source and two kinds of artificial source, the PAHs accounting very little of natural source, Ren Leisheng
Produce the main source that life activity is PAHs, comprising: (1) chemistry such as coke gas, organic chemical industry, petroleum industry, steel-making ironmaking
The waste that industry is discharged in process of production, wherein coking industry bring PAHs pollution is the most serious；(2) aircraft, automobile
The a large amount of exhaust gas of vehicle emissions is waited, contains a considerable amount of PAHs in these exhaust gas；(3) coal heating and household are natural
It is also had in the living scenes such as gas imperfect combustion and generates part PAHs.For PAHs contaminated soil, mainly there are peripheral doses, changes
Technical system based on reparation and biological prosthetic three kinds of recovery techniques.
CN104307865A discloses a kind of contaminated soil heat drive desorption restorative procedure, which is driven by contaminated soil heat
Repair system is desorbed, using waste heats such as high-temperature flue gas, high temperature air, high-temperature steam or high-temp liquids as heat source, using indirect heating
Contaminated soil remediation is carried out, which is suitable for the organic material contaminated soils such as VOCs, SVOCs, PAHs, PCBs, TPHs, pesticide
It repairs, is also applied for the thermal sensitivity heavy-metal contaminated soil reparation such as Hg, As, reaction speed is fast, and repairing efficiency is short, pollutant removal
Rate is up to 99% or more, and using automatic control and real-time monitoring, operational safety is stablized, and economically feasible is without secondary pollution, however, should
There are equipment price valuableness, the higher problem of processing cost for technology.CN104722572B discloses a kind of PAHs contaminated soil
Restorative procedure, in the invention, PAHs contaminated soil to be repaired is symmetrically equipped with anode chamber and cathode chamber, anode chamber and cathode chamber
It is correspondingly provided with anode interlayer and negative electrode interlayer between the contact surface of PAHs contaminated soil to be repaired, anode buffer liquid is in anode chamber
It is circulated between anode buffer pond, Cathode buffer circulates between cathode chamber and cathode buffer pool, what is circulated
0.5~5d disposably sprays 3~300L of laccase solution, the present invention to every square metre of PAHs contaminated soil surface to be repaired
Have the characteristics that in-situ immobilization, the migration and degradation of pollutant in PAHs contaminated soil can be realized simultaneously, however, the technology itself
Incomplete, when being lower than 10% such as soil moisture content, treatment effect is substantially reduced, it is possible to create harmful by-products, existing can lead
Cause the polarization phenomena etc. of current reduction.
To sum up, in the recovery technique of PAHs contaminated soil, the prior art have the defects that it is different degrees of, therefore,
Still need to develop a kind of restorative procedure of new PAHs contaminated soil.
Summary of the invention
To solve the problem of that PAHs contaminated soil remediation exists in the prior art, the purpose of the present invention is to provide PAHs
The restorative procedure of contaminated soil.To achieve the above object, the invention adopts the following technical scheme:
The restorative procedure of PAHs contaminated soil, step include:
(1) contaminated soil is carried out after turning over processing for the first time, is stood after adding photochemical catalyst into soil；
(2) by step (1), treated carries out first time elution processing with the first eluent after soil turns over for the second time；
(3) second of elution processing is carried out with the second eluent after turning over step (2) treated soil third time；
(4) PAHs concentration in soil is detected, repeats step (1)~(3) to testing result qualification.
Preferably, the photochemical catalyst is active carbon-TiO2Composite photo-catalyst.
Preferably, the additive amount of the composite photo-catalyst is that 10~15g is added in every kilogram of soil.
Using the titanium dioxide under ultraviolet light as catalyst, have to the degradation rate of the PAHs in soil different degrees of
It influences.Quality, water content, mineral constituent and the depth of soil can all generate Photocatalytic Oxidation and significantly affect, soil
Crumb structure can influence the diffusion mobility of organic matter and the penetration capacity of light, and soil moisture is adjustable absorption band, soil
Minerals can be such that adsorbed organic pollutant inactivates by photocatalysis, and thickness of soil will affect optical filtering rate and incident light rate.
Preferably, the time of the standing is greater than 48h.
Preferably, first eluent includes the raw material of following mass percent meter:
Ethyl alcohol 85%,
Water 10%,
N-amyl alcohol 5%.
Preferably, second eluent includes the raw material of following mass percent meter:
Tween 80 60%,
Octyl phenol polyoxyethylene ether 15%,
Lauryl sodium sulfate 25%.
Preferably, the temperature of the elution processing is less than 30 DEG C.
The restorative procedure of above-mentioned PAHs contaminated soil, the standard of the testing result qualification are that BaP content is less than
0.1mg/kg, luxuriant and rich with fragrance content are less than 1.0mg/kg.
In the present invention, PAHs refers mainly to luxuriant and rich with fragrance and BaP.
Beneficial effects of the present invention
1, the restorative procedure of PAHs contaminated soil provided by the invention, can be effectively reduced the PAHs in contaminated soil, makes
BaP content is less than 0.1mg/kg, and luxuriant and rich with fragrance content is less than 1.0mg/kg；
2, in restorative procedure provided by the invention, the first eluent is alcohols eluent, and the second eluent is surface-active
Agent, being used in conjunction for two class eluents greatly improve cleaning efficiency, and reparation speed is fast, and effect is good；
3, the present invention first tentatively reduces the PAHs content in soil with composite photo-catalyst, and composite photo-catalyst is active carbon
The TiO of load2, which can not only promote the diffusion mobility of organic matter, while also add the penetration capacity of light, add
The speed degradation of PAHs.
Specific embodiment
The following is specific embodiments of the present invention, and further retouches to technical solution of the present invention work in conjunction with the embodiments
It states, however, the present invention is not limited to these examples.
Embodiment
The restorative procedure of PAHs contaminated soil, step include:
(1) contaminated soil is carried out after turning over processing for the first time, is stood after adding photochemical catalyst into soil；
(2) by step (1), treated carries out first time elution processing with the first eluent after soil turns over for the second time；
(3) second of elution processing is carried out with the second eluent after turning over step (2) treated soil third time；
(4) PAHs concentration in soil is detected, repeats step (1)~(3) to testing result qualification.
Wherein, photochemical catalyst is active carbon-TiO2Composite photo-catalyst, additive amount be addition 10 in every kilogram of soil~
15g。
The time of standing is greater than 48h.
First eluent includes the raw material of following mass percent meter:
Ethyl alcohol 85%, water 10%, n-amyl alcohol 5%.
Second eluent includes the raw material of following mass percent meter:
Tween 80 60%, octyl phenol polyoxyethylene ether 15%, lauryl sodium sulfate 25%.
The temperature of processing is eluted less than 30 DEG C.
The standard of testing result qualification is that BaP content is less than 0.1mg/kg, and luxuriant and rich with fragrance content is less than 1.0mg/kg.
Detect example 1
Using restorative procedure provided by the invention, by way of simulation, artificially contaminated soil is repaired.
Cleaning soil is acquired first, and cleaning soil picks up from the pollution-free topsoil in the Changsha park Mei Xihu (0~1.0m), removes
Rubble loses the magazines such as leaf, the natural air drying at dry and ventilated, and 60 meshes are crossed after grinding, through examining, 5 PAHs detection.It weighs suitable
Amount is luxuriant and rich with fragrance to be dissolved in acetone soln with BaP, is mixed (volume ratio 1:1) with cleaning soil, is constantly stirred during mixing
It mixes, completely, later by the soil aging two months, contaminated soil is prepared, the Polluted Soil in volatilization to rear acetone substantially for 24 hours
Earth phenanthrene concentration is 78.3mg/kg, and BaP concentration is 5.64mg/kg.
The above-mentioned contaminated soil 1kg being prepared is placed in basin, turns over, it is stirred, so for the first time for simulation
75h is stood after adding 10g composite photo-catalyst thereto afterwards.Then it simulates to turn over for the second time and soil is stirred, to soil
First time elution processing is carried out with the first eluent after being again stirring for, simulation third time, which is turned over, later again carries out soil
Then stirring carries out second with the second eluent and elutes to handle and detecting PAHs concentration in soil, recycle above-mentioned steps up to
Testing result is that BaP content is less than 0.1mg/kg, and luxuriant and rich with fragrance content is less than 1.0mg/kg.The results are shown in Table 1.
1 contaminated soil testing result of table
| Pollutant (concentration) | After repairing for the first time | After second is repaired | After third time is repaired |
| Luxuriant and rich with fragrance (78.3mg/kg) | 32.1mg/kg | 12.9mg/kg | 0.05mg/kg |
| BaP (5.64mg/kg) | 1.21mg/kg | 0.54mg/kg | 0.32mg/kg |
Detect example 2
Using restorative procedure provided by the invention, to certain steel plant, old site contaminated soil is repaired.
The soil erosion for choosing test is 100m2, through detecting, which is 12.51mg/kg, BaP
Concentration is 2.22mg/kg.Contaminated soil is carried out after turning over processing for the first time first, it is quiet after addition photochemical catalyst into soil
It sets, carries out first time elution processing with the first eluent after then turning over soil for the second time, then after soil third time is turned over
Carry out second of elution processing with the second eluent, finally detect soil in PAHs concentration, repeat it is aforementioned to testing result be benzene
And pyrene content is less than 0.1mg/kg, luxuriant and rich with fragrance content is less than 1.0mg/kg.The results are shown in Table 2.
2 steel plant's old site contaminated soil testing result of table
| Pollutant (concentration) | After repairing for the first time | After second is repaired |
| Luxuriant and rich with fragrance (12.51mg/kg) | 3.4mg/kg | 0.08mg/kg |
| BaP (2.22mg/kg) | 0.72mg/kg | 0.27mg/kg |
The contaminated soil after repairing twice, soil China and Philippines and BaP content, that is, up to standard.
The restorative procedure of PAHs contaminated soil provided by the invention, can be effectively reduced the PAHs in contaminated soil, makes benzene
And pyrene content is less than 0.1mg/kg, luxuriant and rich with fragrance content is less than 1.0mg/kg.Wherein, the first eluent is alcohols eluent, the second elution
Agent is surfactant, and being used in conjunction for two class eluents greatly improves cleaning efficiency, and reparation speed is fast, and effect is good.The present invention is first
The PAHs content in soil is tentatively reduced with composite photo-catalyst, composite photo-catalyst is activated carbon supported TiO2, the catalysis
Agent can not only promote the diffusion mobility of organic matter, while also add the penetration capacity of light, accelerate the degradation of PAHs.
Claims (8)
- The restorative procedure of 1.PAHs contaminated soil, which is characterized in that step includes:(1) contaminated soil is carried out after turning over processing for the first time, is stood after adding photochemical catalyst into soil；(2) by step (1), treated carries out first time elution processing with the first eluent after soil turns over for the second time；(3) second of elution processing is carried out with the second eluent after turning over step (2) treated soil third time；(4) PAHs concentration in soil is detected, repeats step (1)~(3) to testing result qualification.
- 2. the restorative procedure of PAHs contaminated soil according to claim 1, which is characterized in that the photochemical catalyst is activity Charcoal-TiO2Composite photo-catalyst.
- 3. the restorative procedure of PAHs contaminated soil according to claim 2, which is characterized in that the composite photo-catalyst Additive amount is that 10~15g is added in every kilogram of soil.
- 4. the restorative procedure of PAHs contaminated soil according to claim 1, which is characterized in that the time of the standing is greater than 48h。
- 5. the restorative procedure of PAHs contaminated soil according to claim 1, which is characterized in that first eluent includes The raw material of following mass percent meter:Ethyl alcohol 85%,Water 10%,N-amyl alcohol 5%.
- 6. the restorative procedure of PAHs contaminated soil according to claim 1, which is characterized in that second eluent includes The raw material of following mass percent meter:Tween 80 60%,Octyl phenol polyoxyethylene ether 15%,Lauryl sodium sulfate 25%.
- 7. the restorative procedure of PAHs contaminated soil according to claim 1, which is characterized in that the temperature of the elution processing Less than 30 DEG C.
- 8. the restorative procedure of described in any item PAHs contaminated soils according to claim 1~7, which is characterized in that the detection As a result qualified standard is that BaP content is less than 0.1mg/kg, and luxuriant and rich with fragrance content is less than 1.0mg/kg.
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| CN114907856A (en) * | 2022-05-13 | 2022-08-16 | 中国科学院南京土壤研究所 | Green and efficient polycyclic aromatic hydrocarbon contaminated soil remediation eluent and application method thereof |
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| CN116460126B (en) * | 2023-05-12 | 2023-10-13 | 江苏暨之阳环保科技有限公司 | Method for restoring polycyclic aromatic hydrocarbon polluted soil by utilizing activated sludge |
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Application publication date: 20190517 |