CN107282617B - Polycyclic aromatic hydrocarbon-heavy metal contaminated soil remediation method - Google Patents
Polycyclic aromatic hydrocarbon-heavy metal contaminated soil remediation method Download PDFInfo
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- 239000002689 soil Substances 0.000 title claims abstract description 101
- 238000005067 remediation Methods 0.000 title claims abstract description 38
- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 29
- 229920001661 Chitosan Polymers 0.000 claims abstract description 20
- 239000003480 eluent Substances 0.000 claims abstract description 8
- YNPNZTXNASCQKK-UHFFFAOYSA-N phenanthrene Chemical compound C1=CC=C2C3=CC=CC=C3C=CC2=C1 YNPNZTXNASCQKK-UHFFFAOYSA-N 0.000 claims description 60
- MWPLVEDNUUSJAV-UHFFFAOYSA-N anthracene Chemical compound C1=CC=CC2=CC3=CC=CC=C3C=C21 MWPLVEDNUUSJAV-UHFFFAOYSA-N 0.000 claims description 24
- 238000011065 in-situ storage Methods 0.000 claims description 20
- 229910052793 cadmium Inorganic materials 0.000 claims description 15
- 229910052802 copper Inorganic materials 0.000 claims description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 239000002344 surface layer Substances 0.000 claims description 8
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 7
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- 229920005552 sodium lignosulfonate Polymers 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- BBEAQIROQSPTKN-UHFFFAOYSA-N pyrene Chemical compound C1=CC=C2C=CC3=CC=CC4=CC=C1C2=C43 BBEAQIROQSPTKN-UHFFFAOYSA-N 0.000 claims description 4
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 229910052745 lead Inorganic materials 0.000 claims description 3
- 229910052725 zinc Inorganic materials 0.000 claims description 3
- GVEPBJHOBDJJJI-UHFFFAOYSA-N fluoranthrene Natural products C1=CC(C2=CC=CC=C22)=C3C2=CC=CC3=C1 GVEPBJHOBDJJJI-UHFFFAOYSA-N 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 125000005575 polycyclic aromatic hydrocarbon group Chemical group 0.000 claims description 2
- 238000010828 elution Methods 0.000 abstract description 21
- 231100000252 nontoxic Toxicity 0.000 abstract description 3
- 230000003000 nontoxic effect Effects 0.000 abstract description 3
- 239000004094 surface-active agent Substances 0.000 abstract description 3
- 230000008485 antagonism Effects 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 21
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 15
- 238000002386 leaching Methods 0.000 description 15
- 238000004128 high performance liquid chromatography Methods 0.000 description 9
- 239000002131 composite material Substances 0.000 description 8
- 239000006228 supernatant Substances 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 5
- 238000007873 sieving Methods 0.000 description 5
- 238000007605 air drying Methods 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 230000032683 aging Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- LHHGTXVGQHFYPO-UHFFFAOYSA-N nitric acid perchloric acid hydrochloride Chemical compound Cl(=O)(=O)(=O)O.[N+](=O)(O)[O-].Cl LHHGTXVGQHFYPO-UHFFFAOYSA-N 0.000 description 3
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 230000003042 antagnostic effect Effects 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000007865 diluting Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000005360 mashing Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000011259 mixed solution Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010170 biological method Methods 0.000 description 1
- XIEPJMXMMWZAAV-UHFFFAOYSA-N cadmium nitrate Inorganic materials [Cd+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O XIEPJMXMMWZAAV-UHFFFAOYSA-N 0.000 description 1
- 239000002738 chelating agent Substances 0.000 description 1
- -1 combines physical Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000002262 irrigation Effects 0.000 description 1
- 238000003973 irrigation Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 150000002902 organometallic compounds Chemical class 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000003900 soil pollution Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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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
- B09C1/02—Extraction using liquids, e.g. washing, leaching, flotation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
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- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to a polycyclic aromatic hydrocarbon-heavy metal contaminated soil remediation method. Adding an eluting agent according to the weight ratio of the eluting agent to the soil of 10: 1-30: 1 to elute the polycyclic aromatic hydrocarbon-heavy metal contaminated soil for 12-24 hours according to the dry weight of the soil; the eluting agent consists of 5000-8000 mg/L N-lauroyl ED3A solution and 200-300 mg/L chitosan solution. According to the invention, the chitosan solution and the N-lauroyl ED3A are compounded to be used as the eluent, so that the elution rate of heavy metals and organic matters in the polycyclic aromatic hydrocarbon-heavy metal polluted soil is obviously improved, and the antagonism on the elution of the organic matters due to the existence of the heavy metals when the N-lauroyl ED3A elutes the polycyclic aromatic hydrocarbon-heavy metal polluted soil is overcome; in addition, the chelating surfactant N-dodecanoyl ED3A and chitosan solution are both non-toxic to environment and easily biodegradable.
Description
Technical Field
The invention belongs to the technical field of environmental engineering, and particularly relates to a polycyclic aromatic hydrocarbon-heavy metal contaminated soil remediation method.
Background
The industrialization and the urbanization are rapidly developed, the three wastes discharged into the environment are increased day by day, the problem of severe environmental pollution is generated, the severe influence is caused, and the environment repairing work needs to be carried out urgently. The soil pollution presents the pollution characteristics of multiple sources, complex type, large quantity, wide area and strong toxicity, and the process of the soil environment remediation project is complex and the task is difficult.
The definition of composite pollution refers to the phenomenon that two or more environmental pollutants with different properties exist in the same environmental medium or in the same compartment of an ecological system and are combined. The composite pollution can be divided into three types according to the type of the pollutant: organic matter-organic matter combined pollution, heavy metal-heavy metal combined pollution and heavy metal-organic matter combined pollution. Compared with single pollution, the composite pollution is obviously more complex, and various interactions among pollutants can be generated and are expressed as synergy, antagonism and addition; these interactions complicate their polluting effects and mechanisms, thus increasing the difficulty of research.
At present, the research on the soil remediation process and mechanism under the heavy metal-organic compound pollution condition is still less. The method for repairing the composite contaminated soil mainly combines physical, chemical and biological methods to repair the composite contaminated soil together. The combined remediation technology is a remediation means which makes good use of the advantages and the disadvantages, and the combination of the two remediation methods not only improves the remediation rate and efficiency of single polluted soil, but also can remediate the composite pollution generated by the combined action of a plurality of pollutants. Has become an important research content in the soil remediation technology at present.
Disclosure of Invention
The invention aims to provide a polycyclic aromatic hydrocarbon-heavy metal contaminated soil remediation method.
The purpose of the invention is realized by the following technical scheme:
the invention relates to a polycyclic aromatic hydrocarbon-heavy metal contaminated soil remediation method, which comprises the following steps:
s1, adding an eluent according to the weight ratio of the eluent to soil of 10: 1-30: 1 to elute the polycyclic aromatic hydrocarbon-heavy metal contaminated soil for 12-24 hours; the eluting agent consists of 5000-8000 mg/L N-lauroyl ED3A solution and 200-300 mg/L chitosan solution.
Preferably, step S1 is followed by a step of extracting the eluate for subsequent treatment.
Preferably, the leaching is a cyclic leaching. When in use, the pH value of the eluting agent is preferably adjusted to 9-10. The adjustment is carried out by adding NaOH or HNO3To make the adjustment.
Preferably, the volume ratio of the N-dodecanoyl ED3A solution to the chitosan solution is 3-5: 1.
Preferably, the chitosan solution takes 0.1-0.2 mol/L dilute hydrochloric acid as a solvent.
Preferably, the method further includes step S2:
s2, preparing a soil in-situ remediation agent according to the weight ratio of the chitosan, the sodium lignosulfonate, the iron oxide and the activated carbon of 1-2: 5-6: 2-3, adding the soil in-situ remediation agent into the soil washed in the step S1, adding a proper amount of water, and uniformly mixing; and (5) maintaining to obtain the repaired soil.
Preferably, the addition amount of the soil in-situ remediation agent is 20-30 g/kg.
Preferably, the soil in-situ remediation agent added to the soil washed in step S1 specifically comprises: applying a 0.5-1.5 cm soil in-situ remediation agent on the surface layer of the leached soil; and uniformly mixing the washed soil with the thickness of 20-25 cm from the surface layer with the applied soil in-situ remediation agent in a turning mode.
Preferably, the curing time is 2-10 days.
Preferably, the particle size of the activated carbon is 80-100 meshes.
Preferably, the heavy metal is one or more of Cu, Cd, Ni, Cr, Pb and zn.
Preferably, the polycyclic aromatic hydrocarbon is one or more of anthracene, phenanthrene and pyrene.
Compared with the prior art, the invention has the following beneficial effects:
1. the chelating surfactant N-dodecanoyl ED3A is selected, so that organic matters and heavy metals in the polluted soil can be effectively removed, and the chelating surfactant is non-toxic to the environment and easy to biodegrade; the defects that the traditional ethylenediamine type chelating agent has poor biodegradability and is easy to cause secondary pollution to soil are overcome;
2. the elution of organic matters such as anthracene and phenanthrene in the polycyclic aromatic hydrocarbon-heavy metal polluted soil by adopting single N-dodecanoyl ED3A is inhibitory to the elution of the organic matters such as anthracene and phenanthrene compared with the elution of the organic matters such as anthracene and phenanthrene, wherein the elution rate of the former is only about 35 percent of that of the latter; the reason is that the elution of organic matters such as anthracene and phenanthrene is antagonistic due to the existence of heavy metals such as Cu and Cd; according to the invention, the chitosan solution and the N-dodecanoyl ED3A are compounded to serve as the eluent, so that the elution rate of heavy metals, anthracene, phenanthrene and other organic matters in the polycyclic aromatic hydrocarbon-heavy metal polluted soil is obviously improved, and especially the elution of the anthracene, phenanthrene and other organic matters is obviously improved; the chitosan is also nontoxic to the environment and is easy to biodegrade;
3. the invention further realizes the comprehensive remediation of the polycyclic aromatic hydrocarbon-heavy metal contaminated soil by applying the specific soil in-situ remediation agent.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
Example 1
Taking the soil 0-1.5m below the stratum in the uncontaminated area, removing impurities, naturally air drying, mashing, grinding, and sieving with 60 mesh sieve. Taking 1.0kg of soil and a certain volume of Cu (NO)3)2-Cd(N03)2Mixing the solutions, stirring fully, naturally drying in the air, sieving by a 60-mesh sieve, transferring to a brown closed container, standing and aging for a week to obtain Cu/Cd compound contaminated soil; and pouring methanol dissolved with a certain amount of phenanthrene into the Cu/Cd compound contaminated soil, uniformly stirring, then air-drying by a ventilation cabinet, sieving by a 60-mesh sieve, moving to a brown closed container, standing and aging for one week to obtain the Cu/Cd-phenanthrene compound contaminated soil, wherein the concentrations of Cu and Cd are both 500mg/kg, and the concentration of phenanthrene is 100 mg/kg.
Taking the soil 0-1.5m below the stratum in the uncontaminated area, removing impurities, naturally air drying, mashing, grinding, and sieving with 60 mesh sieve. Uniformly stirring 1.0kg of soil and methanol dissolved with a certain amount of phenanthrene, then air-drying in a ventilation cabinet, sieving with a 60-mesh sieve, moving to a brown closed container, standing and aging for one week to obtain the phenanthrene-contaminated soil, wherein the concentration of the phenanthrene is 100 mg/kg.
Adding 20ml of 8000ml/L N-dodecanoyl ED3A solution into 1g of phenanthrene contaminated soil, sealing the soil with a cover, placing the soil into a gas bath constant temperature oscillator at the temperature of 25 ℃ and the speed of 150r/min, oscillating the soil for 12 hours, centrifuging the upper layer mixed solution (3500r/min, 30min), taking the supernatant, filtering the supernatant through a 0.45 mu m filter membrane, putting the supernatant into a sample injection bottle, and measuring the concentration of phenanthrene by HPLC. Conditions for HPLC analysis: AT-LICHROMOS 2C18 reversed phase chromatographic column (250mm × 4.6mm × 5 μm), column temperature 30 deg.C, mobile phase of methanol and water (80: 20v/v), flow rate of 1ml/min, and detection wavelength of 250 nm. The calculated elution rate of phenanthrene was 46%.
Taking 1g of Cu/Cd-phenanthrene composite polluted soil, adding 20ml of 8000ml/L N-dodecanoyl ED3A solution, covering and sealing, placing in a gas bath constant temperature oscillator at the temperature of 25 ℃ and the speed of 150r/min, oscillating for 12h, centrifuging the upper layer mixed solution (3500r/min, 30min), taking part of the upper layer clear solution to a colorimetric tube, diluting to a proper proportion, and measuring the contents of Cu and Cd by a flame atomic absorption method (the measuring wavelength is 324.8nm, and the flame type is acetylene-air). The other part of the supernatant was filtered through a 0.45 μm filter into a sample vial and the phenanthrene concentration was determined by HPLC. Conditions for HPLC analysis: AT-LICHROMOS 2C18 reversed phase chromatographic column (250mm × 4.6mm × 5 μm), column temperature 30 deg.C, mobile phase of methanol and water (80: 20v/v), flow rate of 1ml/min, and detection wavelength of 250 nm. The elution rate was calculated: the elution rates of Cu, Cd and phenanthrene are respectively 60%, 72% and 15% (the elution rate is far lower than that of phenanthrene in single phenanthrene-polluted soil by 46%). It can be seen that the Cu and Cd in the composite contaminated soil have antagonistic action on the elution of phenanthrene when the N-dodecanoyl ED3A solution is used for leaching.
Adding 17ml of an eluent consisting of 8000ml/L N-dodecanoyl ED3A solution and 3ml of a 300ml/L chitosan solution into 1g of Cu/Cd-phenanthrene compound contaminated soil, adjusting the pH value to 11, covering and sealing, and then placing into a gas bath constant temperature oscillator at the temperature of 25 ℃ and at the speed of 150r/min for oscillation for 12 hours. Centrifuging the upper layer mixture (3500r/min, 30min), collecting part of the supernatant, diluting to appropriate ratio, and measuring Cu and Cd content by flame atomic absorption method (measuring wavelength is 324.8nm, flame type is acetylene-air). The other part of the supernatant was filtered through a 0.45 μm filter into a sample vial and the phenanthrene concentration was determined by HPLC. Conditions for HPLC analysis: AT-LICHROMOS 2C18 reversed phase chromatographic column (250mm × 4.6mm × 5 μm), column temperature 30 deg.C, mobile phase of methanol and water (80: 20v/v), flow rate of 1ml/min, and detection wavelength of 250 nm. The elution rate was calculated: the elution rates of Cu, Cd and phenanthrene are 85%, 90% and 52%, respectively. Therefore, the elution agent is prepared by compounding the chitosan solution and the N-dodecanoyl ED3A, so that the elution rates of Cu, Cd and phenanthrene in the Cu/Cd-phenanthrene compound contaminated soil are improved, and the elution of anthracene is particularly and obviously improved.
Further compounding the chitosan solution and N-dodecanoyl ED3A to obtain the soil after being washed by the washing agent, adding a soil in-situ repairing agent (the weight ratio of chitosan, sodium lignosulfonate, ferric oxide and active carbon (80-100 meshes) is 1: 5: 2) according to the proportion of 20g/kg, uniformly stirring, and maintaining for 1 week. After the soil sample is digested by hydrochloric acid-nitric acid-perchloric acid, the contents of Cu and Cd are determined by adopting a flame atomic absorption method, and the concentration of phenanthrene is determined by adopting HPLC. The elution rate was calculated: the elution rates of Cu, Cd and phenanthrene are respectively 95%, 99% and 74%.
Example 2
Contaminated soil (2549mg/kg Pb, 26mg/kg Cd, 973mg/kg Zn, 45mg/kg phenanthrene) near a certain smelter. The leaching pipeline system is arranged on the ground surface, the upper edge of the pipeline is equal to the ground surface, leaching agent compounded by 5000ml/L N-dodecanoyl ED3A solution and 200mg/L chitosan solution with the volume ratio of 3: 1 is controlled by an electromagnetic valve to enter the polluted soil through micropores on the leaching pipeline system under the action of a pressure pump, the leaching time is about 24 hours, and the water-soil ratio is about 30: 1; and after the leaching is finished, extracting and collecting the leaching solution leached out of the soil by a vacuum suction pump.
Preparing a soil in-situ remediation agent according to the weight ratio of chitosan, sodium lignosulphonate, ferric oxide and active carbon of 2: 6: 3, and applying 1.5cm of the soil in-situ remediation agent on the surface layer of the washed soil; uniformly mixing the washed soil with the thickness of 25cm away from the surface layer with the applied soil in-situ remediation agent in a turning mode; maintaining for 10 days.
After the soil sample is digested by hydrochloric acid-nitric acid-perchloric acid, the contents of Pb, Cd and Zn are determined by adopting a flame atomic absorption method, and the concentration of phenanthrene is determined by adopting HPLC; the Pb content is 180mg/kg, the Cd content is 0.2mg/kg, the Zn content is 152mg/kg, and the phenanthrene content is 11 mg/kg. The repaired soil meets the requirement of secondary standard value in soil environment quality standard (GB 15618-1995).
Example 3
The soil of a certain pollution irrigation area contains 86.8mg/kg of Cu, 174.9mg/kg of Zn, 3.52mg/kg of Cd, 94.5mg/kg of Cr, 15mg/kg of anthracene and 9mg/kg of phenanthrene. The leaching pipeline system is arranged on the ground surface, the upper edge of the pipeline is equal to the ground surface, leaching agent compounded by 7000ml/L N-dodecanoyl ED3A solution and 260mg/L chitosan solution with the volume ratio of 4: 1 is controlled by an electromagnetic valve to enter the polluted soil through micropores on the leaching pipeline system under the action of a pressure pump, the leaching time is about 24 hours, and the water-soil ratio is about 10: 1; and after the leaching is finished, extracting and collecting the leaching solution leached out of the soil by a vacuum suction pump.
Preparing a soil in-situ remediation agent according to the weight ratio of chitosan, sodium lignosulphonate, ferric oxide and active carbon of 1: 2: 6:2, and applying 1.0cm of the soil in-situ remediation agent on the surface layer of the washed soil; uniformly mixing the washed soil with the thickness of 20cm from the surface layer with the applied soil in-situ remediation agent in a turning mode; maintaining for 10 days.
After the soil sample is digested by hydrochloric acid-nitric acid-perchloric acid, the contents of Cu, Zn, Cd and Cr are measured by adopting a flame atomic absorption method, and the concentrations of anthracene and phenanthrene are measured by adopting HPLC; the Cu content is 18mg/kg, the Zn content is 75mg/kg, the Cd content is 0.1mg/kg, the Cr content is 20mg/kg, the anthracene content is 5.7mg/kg, and the phenanthrene content is 1.2 mg/kg. The repaired soil meets the requirement of secondary standard value in soil environment quality standard (GB 15618-1995).
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (7)
1. A polycyclic aromatic hydrocarbon-heavy metal contaminated soil remediation method is characterized by comprising the following steps:
s1, adding an eluent according to the weight ratio of the eluent to soil of 10: 1-30: 1 to elute the polycyclic aromatic hydrocarbon-heavy metal contaminated soil for 12-24 hours according to the dry weight of the soil; the eluent consists of 5000-8000 mg/L N-lauroyl ED3A solution and 200-300 mg/L chitosan solution; the volume ratio of the N-dodecanoyl ED3A solution to the chitosan solution is 3-5: 1;
the heavy metal is the combination of Cu and Cd, or the combination of Cu, Cd and one or more of Ni, Cr, Pb and Zn.
2. The method for remediating polycyclic aromatic hydrocarbon-heavy metal contaminated soil according to claim 1, wherein the step S1 is followed by a step of extracting the eluate for subsequent treatment.
3. The polycyclic aromatic hydrocarbon-heavy metal contaminated soil remediation method according to claim 1, further comprising step S2:
s2, preparing a soil in-situ remediation agent according to the weight ratio of chitosan, sodium lignosulfonate, iron oxide and active carbon of 1-2: 5-6: 2-3, adding the soil in-situ remediation agent into the soil washed in the step S1, adding a proper amount of water, and uniformly mixing; and (5) maintaining to obtain the repaired soil.
4. The polycyclic aromatic hydrocarbon-heavy metal contaminated soil remediation method according to claim 3, wherein the addition amount of the soil in-situ remediation agent is 20-30 g/kg.
5. The polycyclic aromatic hydrocarbon-heavy metal contaminated soil remediation method of claim 3, wherein the soil in-situ remediation agent is added to the soil washed in step S1, and specifically comprises: applying a 0.5-1.5 cm soil in-situ remediation agent on the surface layer of the leached soil; and uniformly mixing the washed soil with the thickness of 20-25 cm from the surface layer with the applied soil in-situ remediation agent in a turning mode.
6. The polycyclic aromatic hydrocarbon-heavy metal contaminated soil remediation method according to claim 3, wherein the curing time is 2-10 days.
7. The method for remediating polycyclic aromatic hydrocarbon-heavy metal contaminated soil according to claim 1, wherein the polycyclic aromatic hydrocarbon is one or more of anthracene, phenanthrene and pyrene.
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| CN108213064A (en) * | 2017-12-05 | 2018-06-29 | 中国科学院南京土壤研究所 | A kind of medicament of in-situ immobilization high concentration polycyclic aromatic hydrocarbon pollution and its application |
| CN109748350B (en) * | 2018-12-11 | 2022-03-01 | 广州普邦园林股份有限公司 | Adsorbent for heavy metal and polycyclic aromatic hydrocarbon polluted water body and remediation method |
| CN109365498B (en) * | 2018-12-20 | 2021-02-09 | 北京市环境保护科学研究院 | Method for reducing bioavailability of soil PAHs and soil treatment device |
| CN109940032B (en) * | 2019-04-08 | 2021-06-22 | 德州学院 | Remediation method of organic pollutant-heavy metal composite contaminated soil |
| CN110732549B (en) * | 2019-10-23 | 2022-06-28 | 深圳研源环境科技有限公司 | Heavy metal and pesticide composite polluted soil treatment process |
| CN111014273A (en) * | 2019-12-13 | 2020-04-17 | 兰州交通大学 | Application of N-LED3A surfactant in leaching remediation of heavy metal-polycyclic aromatic hydrocarbon combined contaminated soil |
| CN112371717A (en) * | 2020-10-22 | 2021-02-19 | 华东理工大学 | Method for reinforcing electrokinetic remediation of organic-heavy metal combined contaminated soil by chelating surfactant |
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| JP2005146275A (en) * | 2003-10-24 | 2005-06-09 | Growth Factor:Kk | Agent for improving, solidifying, and stabilizing soil and its quality |
| JP2007216069A (en) * | 2005-10-28 | 2007-08-30 | Sumikon Serutekku Kk | Treating method of contaminated soil |
| CN101224467A (en) * | 2008-01-04 | 2008-07-23 | 南京大学 | Leaching agent for repairing polycyclic aromatic hydrocarbon-cuprum compound polluted soil and method thereof |
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