CN114130810A - Remediation method of halohydrocarbon contaminated soil - Google Patents
Remediation method of halohydrocarbon contaminated soil Download PDFInfo
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- CN114130810A CN114130810A CN202111432852.4A CN202111432852A CN114130810A CN 114130810 A CN114130810 A CN 114130810A CN 202111432852 A CN202111432852 A CN 202111432852A CN 114130810 A CN114130810 A CN 114130810A
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- 239000002689 soil Substances 0.000 title claims abstract description 165
- 238000000034 method Methods 0.000 title claims abstract description 36
- 150000005826 halohydrocarbons Chemical class 0.000 title abstract description 11
- 238000005067 remediation Methods 0.000 title description 11
- 239000002028 Biomass Substances 0.000 claims abstract description 44
- 238000012423 maintenance Methods 0.000 claims abstract description 44
- 150000008282 halocarbons Chemical class 0.000 claims abstract description 40
- 239000000126 substance Substances 0.000 claims abstract description 35
- 239000002068 microbial inoculum Substances 0.000 claims abstract description 33
- UMPKMCDVBZFQOK-UHFFFAOYSA-N potassium;iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[K+].[Fe+3] UMPKMCDVBZFQOK-UHFFFAOYSA-N 0.000 claims abstract description 24
- 235000017060 Arachis glabrata Nutrition 0.000 claims description 23
- 244000105624 Arachis hypogaea Species 0.000 claims description 23
- 235000010777 Arachis hypogaea Nutrition 0.000 claims description 23
- 235000018262 Arachis monticola Nutrition 0.000 claims description 23
- 241000209094 Oryza Species 0.000 claims description 23
- 235000007164 Oryza sativa Nutrition 0.000 claims description 23
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 23
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 23
- 239000000292 calcium oxide Substances 0.000 claims description 23
- 235000020232 peanut Nutrition 0.000 claims description 23
- 235000009566 rice Nutrition 0.000 claims description 23
- 239000000463 material Substances 0.000 claims description 17
- 239000000203 mixture Substances 0.000 claims description 14
- 240000006439 Aspergillus oryzae Species 0.000 claims description 11
- 235000002247 Aspergillus oryzae Nutrition 0.000 claims description 11
- 241000194108 Bacillus licheniformis Species 0.000 claims description 11
- 244000063299 Bacillus subtilis Species 0.000 claims description 11
- 235000014469 Bacillus subtilis Nutrition 0.000 claims description 11
- 241000589516 Pseudomonas Species 0.000 claims description 11
- 241000589614 Pseudomonas stutzeri Species 0.000 claims description 11
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 7
- 238000007865 diluting Methods 0.000 claims description 7
- 229910017604 nitric acid Inorganic materials 0.000 claims description 7
- 230000002378 acidificating effect Effects 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 238000011065 in-situ storage Methods 0.000 abstract description 2
- 230000001066 destructive effect Effects 0.000 abstract 1
- 239000000575 pesticide Substances 0.000 description 8
- 229910001385 heavy metal Inorganic materials 0.000 description 6
- 238000002360 preparation method Methods 0.000 description 6
- 239000000356 contaminant Substances 0.000 description 4
- 239000002957 persistent organic pollutant Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 238000003900 soil pollution Methods 0.000 description 3
- 239000010793 electronic waste Substances 0.000 description 2
- 210000003608 fece Anatomy 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000010871 livestock manure Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 230000032258 transport Effects 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- YVGGHNCTFXOJCH-UHFFFAOYSA-N DDT Chemical compound C1=CC(Cl)=CC=C1C(C(Cl)(Cl)Cl)C1=CC=C(Cl)C=C1 YVGGHNCTFXOJCH-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 150000001555 benzenes Chemical class 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- BIWJNBZANLAXMG-YQELWRJZSA-N chloordaan Chemical compound ClC1=C(Cl)[C@@]2(Cl)C3CC(Cl)C(Cl)C3[C@]1(Cl)C2(Cl)Cl BIWJNBZANLAXMG-YQELWRJZSA-N 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000010840 domestic wastewater Substances 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011066 ex-situ storage Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- CKAPSXZOOQJIBF-UHFFFAOYSA-N hexachlorobenzene Chemical compound ClC1=C(Cl)C(Cl)=C(Cl)C(Cl)=C1Cl CKAPSXZOOQJIBF-UHFFFAOYSA-N 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000002262 irrigation Effects 0.000 description 1
- 238000003973 irrigation Methods 0.000 description 1
- 244000144972 livestock Species 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- GVYLCNUFSHDAAW-UHFFFAOYSA-N mirex Chemical compound ClC12C(Cl)(Cl)C3(Cl)C4(Cl)C1(Cl)C1(Cl)C2(Cl)C3(Cl)C4(Cl)C1(Cl)Cl GVYLCNUFSHDAAW-UHFFFAOYSA-N 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000003993 organochlorine pesticide Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 125000005575 polycyclic aromatic hydrocarbon group Chemical group 0.000 description 1
- 244000144977 poultry Species 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
- 238000004056 waste incineration Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/10—Reclamation of contaminated soil microbiologically, biologically or by using enzymes
-
- 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)
- Engineering & Computer Science (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Biotechnology (AREA)
- General Health & Medical Sciences (AREA)
- Microbiology (AREA)
- Molecular Biology (AREA)
- Mycology (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a method for repairing halohydrocarbon contaminated soil, which solves the technical problems of high cost and possibility of causing secondary pollution in the prior art for treating the halohydrocarbon contaminated soil. It comprises the following steps: s1, deeply ploughing the soil of the polluted land according to the depth of the polluted soil; s2, controlling the pH value of the soil to be 3-6; s3, adding potassium ferrate into the polluted soil, and deeply ploughing and uniformly raking; s4, adding biomass substances into the soil treated in the step S3, and adjusting the pH value of the soil to be alkalescent; s5, adding a maintenance microbial inoculum into the soil treated in the step S4 for soil maintenance. The method for repairing the soil polluted by the halogenated hydrocarbon adopts an in-situ repairing method of the polluted soil, has low treatment cost, can avoid secondary pollution, and has no destructive damage to the soil.
Description
Technical Field
The invention relates to the technical field of contaminated soil remediation, in particular to a remediation method of halohydrocarbon contaminated soil.
Background
Soil pollution refers to the phenomenon that toxic and harmful pollutants generated by human activities enter soil and are accumulated to a certain degree, so that the soil quality is deteriorated, the functions are reduced, and adverse effects and damages are caused to people and crops. The sources of soil pollution are very wide, and mainly include industrial pollution sources (discharge of industrial three wastes), agricultural pollution sources (chemical fertilizers, pesticides, livestock and poultry manure and the like), domestic pollution sources (urban and rural domestic wastewater, farmyard manure and the like) and other pollution sources (waste incineration and the like). The contaminated soil can be roughly classified into the following categories, according to the type of main contaminants:
(1) and (5) heavy metal pollution sites. Including heavy metals that enter the soil with atmospheric sedimentation, heavy metals that enter the soil with sewage irrigation, heavy metals that enter the soil with solid waste, representative contaminants include arsenic, lead, cadmium, chromium, and the like.
(2) Persistent Organic Pollutants (POPs) contaminate the field. Including organophosphorus pesticides, organochlorine pesticides, petroleum, polycyclic aromatic hydrocarbons, methane, harmful microorganisms, and the like. China is the first major pesticide using country in the world, and the data of Ministry of agriculture shows that about 175 ten thousand tons of pesticides are used for agriculture, pasture and forestry production every year, the number is 2.5-3 times of the average level in the world, but only about 30 percent of the application amount of the pesticides acts on target organisms, and the rest 70 percent of the application amount of the pesticides enters the environment. The POPs of pesticides which are once produced and widely used in China mainly comprise dichlorodiphenyl trichloroethane, hexachlorobenzene, chlordane, mirex and the like, and some pesticides still remain in soil although forbidden for many years. At present, the stock of the pollution sites in China is large.
(3) The organic pollution is mainly used in petroleum, chemical industry, coking and other polluted places. The contaminants are represented by organic solvents, such as benzene series and halogenated hydrocarbons. Other contaminants, such as heavy metals, are also often complexed.
(4) The electronic waste pollutes the field and the like. The extensive electronic waste disposal mode can threaten human health, and the site pollutants take heavy metals and POPs (mainly brominated flame retardants and dioxin highly toxic substances) as main pollution characteristics.
In the prior art, the treatment of the soil polluted by the halogenated hydrocarbon generally adopts the following steps: (1) the soil replacement method is to dig out and transport the soil polluted by halohydrocarbon, perform landfill treatment on the polluted soil, and backfill new clean soil in the original polluted land, but the treatment method only transports the polluted soil away and does not perform treatment, so that the cost is high, and secondary pollution is easily caused; (2) the method comprises the steps of (1) a ventilation method, wherein due to the high volatility of the halogenated hydrocarbon, soil pollution can be eliminated by drilling a well in a polluted area and inducing air convection to accelerate the volatilization of pollutants, but the treatment efficiency of the treatment method on the halogenated hydrocarbon is influenced by various factors, so that the ventilation method is not adopted for the treatment of the halogenated hydrocarbon generally; (3) the heat treatment method is an ex-situ remediation method, which is characterized in that soil of a polluted ground is dug out, volatile halogenated hydrocarbons are driven out of the soil by a heating method, then the soil is collected and treated, and the treated soil is refilled into the polluted ground.
The applicant has found that the prior art has at least the following technical problems:
the treatment of the soil polluted by the halogenated hydrocarbon in the prior art has the technical problems of high cost and possibility of causing secondary pollution.
Disclosure of Invention
The invention aims to provide a method for repairing halohydrocarbon polluted soil, which aims to solve the technical problems of high cost and possibility of causing secondary pollution in the prior art for treating the halohydrocarbon polluted soil.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a method for repairing halogenated hydrocarbon polluted soil, which is characterized by comprising the following steps:
s1, deeply ploughing the soil of the polluted land according to the depth of the polluted soil;
s2, when the initial pH value of the polluted soil is higher than 6, pre-acidifying the polluted soil by adopting an acidic substance, and controlling the pH value of the soil to be 3-6;
s3, adding potassium ferrate into the polluted soil, deeply ploughing and uniformly raking, wherein the adding amount of the potassium ferrate is 2-3 times of the molar amount of the halogenated hydrocarbon in the polluted soil;
s4, adding biomass substances into the soil treated in the step S3, and adjusting the pH value of the soil to be alkalescent; the biomass substance is prepared from rice hulls, peanut shells, coffee grounds and calcium oxide, wherein the weight ratio of the rice hulls to the peanut shells to the coffee grounds to the calcium oxide is 2-5: 1-3;
s5, adding a maintenance microbial inoculum into the soil treated in the step S4 for soil maintenance, wherein the maintenance microbial inoculum comprises pseudomonas stutzeri, bacillus licheniformis, pseudomonas perforatum, bacillus subtilis and aspergillus oryzae; the volume ratio of the pseudomonas stutzeri to the bacillus licheniformis to the pseudomonas perforatum to the bacillus subtilis to the aspergillus oryzae agent is 10-15: 20-30: 8-10: 10-15: 2-5; and (5) maintaining the soil for 30-60 days, and completing restoration after maintenance is finished.
Further, in step S2, the acidic substance is a dilute nitric acid solution.
Further, in the step S3, the potassium ferrate is added into the polluted soil in a divided manner according to the molar weight of 0.2-0.5 time of the halogenated hydrocarbon in the polluted soil.
Further, in the step S4, the weight ratio of the rice hull, the peanut shell, the coffee grounds and the calcium oxide is 4:3:2: 2.
Further, in the step S4, the preparation method of the biomass material includes the following steps:
firstly, uniformly mixing rice hulls, peanut shells, coffee grounds and calcium oxide according to a ratio;
secondly, pyrolyzing the mixture for 180-250 min at the pressure of 0.2-1.0 KPa and the temperature of 300-400 ℃ to obtain a biomass material;
and thirdly, crushing the biomass material to obtain the biomass substance.
Further, in the step S5, the volume ratio of the pseudomonas stutzeri, the bacillus licheniformis, the pseudomonas perforatum, the bacillus subtilis and the aspergillus oryzae agent is 12:25:9:12: 4.
Further, in the step S5, the maintenance microbial inoculum is 200-400 mL/m3Adding is carried out whenAnd (6) diluting.
Based on the technical scheme, the embodiment of the invention can at least produce the following technical effects:
(1) according to the method for repairing the soil polluted by the halogenated hydrocarbon, the method for repairing the polluted soil in situ is adopted, the soil does not need to be dug out, transported and backfilled, the labor cost and the transportation cost for treating the soil can be reduced, and the treatment cost of the soil polluted by the halogenated hydrocarbon is integrally reduced;
(2) the method for repairing the halohydrocarbon contaminated soil comprises the steps of deeply ploughing the contaminated soil to adjust the pH value, adding potassium ferrate, wherein the potassium ferrate belongs to an alkaline substance and can play a strong oxidizing property under an acidic condition to remove most of halohydrocarbon in the contaminated soil, adjusting the soil to be alkaline by the added biomass substance, so that a good soil environment is provided for subsequent soil maintenance, and the compound microbial inoculum added during soil maintenance can further remove the residual halohydrocarbon in the contaminated soil to reach the environmental standard and avoid secondary pollution;
(3) according to the method for restoring the soil polluted by the halogenated hydrocarbon, the soil is not damaged destructively in the whole restoring process, the restored soil can be used for planting crops, medicinal materials or other cash crops, the soil is fertile, and the method can be widely used.
Detailed Description
The first embodiment is as follows:
example 1:
a method for restoring soil polluted by halogenated hydrocarbon comprises the following steps:
s1, deeply ploughing the soil of the polluted land according to the depth of the polluted soil;
s2, when the initial pH value of the polluted soil is higher than 6, pre-acidifying the polluted soil by using a dilute nitric acid solution, and controlling the pH value of the soil to be 6;
s3, adding potassium ferrate into the polluted soil, deeply ploughing and uniformly raking, wherein the adding amount of the potassium ferrate is 3 times of the molar amount of the halogenated hydrocarbon in the polluted soil;
adding potassium ferrate into the polluted soil in 0.5 time of the molar weight of the halogenated hydrocarbon in the polluted soil;
s4, adding biomass substances into the soil treated in the step S3, and adjusting the pH value of the soil to be alkalescent;
the biomass substance is prepared from rice hulls, peanut shells, coffee grounds and calcium oxide, wherein the weight ratio of the rice hulls to the peanut shells to the coffee grounds to the calcium oxide is 5:2:3: 1; the preparation method of the biomass substance comprises the following steps:
firstly, uniformly mixing rice hulls, peanut shells, coffee grounds and calcium oxide according to a ratio;
secondly, pyrolyzing the mixture for 250min at the pressure of 0.2KPa and the temperature of 400 ℃ to obtain a biomass material;
crushing the biomass material to obtain biomass substance;
s5, adding a maintenance microbial inoculum into the soil treated in the step S4 for soil maintenance, wherein the maintenance microbial inoculum is 400mL/m3Adding, diluting by 2 times, and adding by a sprayer; in the maintenance microbial inoculum, the volume ratio of pseudomonas stutzeri, bacillus licheniformis, pseudomonas perforatum, bacillus subtilis and aspergillus oryzae microbial inoculum is 10:30:8:15: 5; the soil is maintained for 30 days after the maintenance microbial inoculum is added, and the remediation is finished after the maintenance is finished.
Example 2:
a method for restoring soil polluted by halogenated hydrocarbon comprises the following steps:
s1, deeply ploughing the soil of the polluted land according to the depth of the polluted soil;
s2, when the initial pH value of the polluted soil is higher than 6, pre-acidifying the polluted soil by using a dilute nitric acid solution, and controlling the pH value of the soil to be 3;
s3, adding potassium ferrate into the polluted soil, deeply ploughing and uniformly raking, wherein the adding amount of the potassium ferrate is 2 times of the molar amount of the halogenated hydrocarbon in the polluted soil;
adding potassium ferrate in 0.2 times of the molar weight of the halogenated hydrocarbon in the polluted soil;
s4, adding biomass substances into the soil treated in the step S3, and adjusting the pH value of the soil to be alkalescent;
the biomass substance is prepared from rice hulls, peanut shells, coffee grounds and calcium oxide, wherein the weight ratio of the rice hulls to the peanut shells to the coffee grounds to the calcium oxide is 2:5:1: 3; the preparation method of the biomass substance comprises the following steps:
firstly, uniformly mixing rice hulls, peanut shells, coffee grounds and calcium oxide according to a ratio;
secondly, pyrolyzing the mixture for 180min at the pressure of 1.0KPa and the temperature of 300 ℃ to obtain a biomass material;
crushing the biomass material to obtain biomass substance;
s5, adding a maintenance microbial inoculum into the soil treated in the step S4 for soil maintenance, wherein the maintenance microbial inoculum is 200mL/m3Adding, diluting by 5 times, and adding by a sprayer; in the maintenance microbial inoculum, the volume ratio of pseudomonas stutzeri, bacillus licheniformis, pseudomonas perforatum, bacillus subtilis and aspergillus oryzae microbial inoculum is 15:20:10:10: 2; the soil is maintained for 60 days after the maintenance microbial inoculum is added, and the remediation is finished after the maintenance is finished.
Example 3:
a method for restoring soil polluted by halogenated hydrocarbon comprises the following steps:
s1, deeply ploughing the soil of the polluted land according to the depth of the polluted soil;
s2, when the initial pH value of the polluted soil is higher than 6, pre-acidifying the polluted soil by using a dilute nitric acid solution, and controlling the pH value of the soil to be 4;
s3, adding potassium ferrate into the polluted soil, deeply ploughing and uniformly raking, wherein the adding amount of the potassium ferrate is 2.2 times of the molar amount of the halogenated hydrocarbon in the polluted soil;
adding potassium ferrate into the polluted soil in a divided manner according to 0.3 time of the molar weight of the halogenated hydrocarbon in the polluted soil;
s4, adding biomass substances into the soil treated in the step S3, and adjusting the pH value of the soil to be alkalescent;
the biomass substance is prepared from rice hulls, peanut shells, coffee grounds and calcium oxide, wherein the weight ratio of the rice hulls to the peanut shells to the coffee grounds to the calcium oxide is 3:4:1: 3; the preparation method of the biomass substance comprises the following steps:
firstly, uniformly mixing rice hulls, peanut shells, coffee grounds and calcium oxide according to a ratio;
secondly, pyrolyzing the mixture for 200min at the pressure of 0.4KPa and the temperature of 380 ℃ to obtain a biomass material;
crushing the biomass material to obtain biomass substance;
s5, adding a maintenance microbial inoculum into the soil treated in the step S4 for soil maintenance, wherein the maintenance microbial inoculum is 220mL/m3Adding the mixture, diluting the mixture by 2-5 times during adding, and adding the mixture by a sprayer; in the maintenance microbial inoculum, the volume ratio of pseudomonas stutzeri, bacillus licheniformis, pseudomonas perforatum, bacillus subtilis and aspergillus oryzae microbial inoculum is 14:22:8:12: 5; the soil is maintained for 50 days after the maintenance microbial inoculum is added, and the remediation is finished after the maintenance is finished.
Example 4:
a method for restoring soil polluted by halogenated hydrocarbon comprises the following steps:
s1, deeply ploughing the soil of the polluted land according to the depth of the polluted soil;
s2, when the initial pH value of the polluted soil is higher than 6, pre-acidifying the polluted soil by using a dilute nitric acid solution, and controlling the pH value of the soil to be 5;
s3, adding potassium ferrate into the polluted soil, deeply ploughing and uniformly raking, wherein the adding amount of the potassium ferrate is 3 times of the molar amount of the halogenated hydrocarbon in the polluted soil;
adding potassium ferrate into the polluted soil in 0.5 time of the molar weight of the halogenated hydrocarbon in the polluted soil;
s4, adding biomass substances into the soil treated in the step S3, and adjusting the pH value of the soil to be alkalescent;
the biomass substance is prepared from rice hulls, peanut shells, coffee grounds and calcium oxide, wherein the weight ratio of the rice hulls to the peanut shells to the coffee grounds to the calcium oxide is 2:5:3: 1; the preparation method of the biomass substance comprises the following steps:
firstly, uniformly mixing rice hulls, peanut shells, coffee grounds and calcium oxide according to a ratio;
secondly, pyrolyzing the mixture for 180min at the pressure of 1.0KPa and the temperature of 300 ℃ to obtain a biomass material;
crushing the biomass material to obtain biomass substance;
s5, adding a maintenance microbial inoculum into the soil treated in the step S4 for soil maintenance, wherein the maintenance microbial inoculum is 380mL/m3Adding, diluting by 5 times, and adding by a sprayer; in the maintenance microbial inoculum, the volume ratio of pseudomonas stutzeri, bacillus licheniformis, pseudomonas perforatum, bacillus subtilis and aspergillus oryzae microbial inoculum is 10:30:8:15: 5; the soil is maintained for 40 days after the maintenance microbial inoculum is added, and the remediation is finished after the maintenance is finished.
Example 5:
a method for restoring soil polluted by halogenated hydrocarbon comprises the following steps:
s1, deeply ploughing the soil of the polluted land according to the depth of the polluted soil;
s2, when the initial pH value of the polluted soil is higher than 6, pre-acidifying the polluted soil by using a dilute nitric acid solution, and controlling the pH value of the soil to be 5;
s3, adding potassium ferrate into the polluted soil, deeply ploughing and uniformly raking, wherein the adding amount of the potassium ferrate is 2.5 times of the molar amount of the halogenated hydrocarbon in the polluted soil; adding potassium ferrate into the polluted soil in a divided manner according to 0.3 time of the molar weight of the halogenated hydrocarbon in the polluted soil;
s4, adding biomass substances into the soil treated in the step S3, and adjusting the pH value of the soil to be alkalescent;
the biomass substance is prepared from rice hulls, peanut shells, coffee grounds and calcium oxide, wherein the weight ratio of the rice hulls to the peanut shells to the coffee grounds to the calcium oxide is 4:3:2: 2; the preparation method of the biomass substance comprises the following steps:
firstly, uniformly mixing rice hulls, peanut shells, coffee grounds and calcium oxide according to a ratio;
secondly, pyrolyzing the mixture for 220min at the pressure of 0.8KPa and the temperature of 350 ℃ to obtain a biomass material;
crushing the biomass material to obtain biomass substance;
s5, adding a maintenance microbial inoculum into the soil treated in the step S4 for soil maintenance, wherein the maintenance microbial inoculum is 300mL/m3Adding the mixture, diluting the mixture by 3 times when adding the mixture, and adding the mixture by a sprayer; in the maintenance microbial inoculum, the application isThe volume ratio of pseudomonas stutzeri, bacillus licheniformis, pseudomonas perforatum, bacillus subtilis and aspergillus oryzae microbial inoculum is 12:25:9:12: 4; the soil is maintained for 45 days after the maintenance microbial inoculum is added, and the remediation is finished after the maintenance is finished.
Secondly, the contents of the halogenated hydrocarbons in the soil before and after the soil remediation in examples 1 to 5 are detected, and the results are shown in the following table 1:
TABLE 1 measurement of halogenated hydrocarbon content
Claims (7)
1. The method for restoring the soil polluted by the halogenated hydrocarbon is characterized by comprising the following steps:
s1, deeply ploughing the soil of the polluted land according to the depth of the polluted soil;
s2, when the initial pH value of the polluted soil is higher than 6, pre-acidifying the polluted soil by adopting an acidic substance, and controlling the pH value of the soil to be 3-6;
s3, adding potassium ferrate into the polluted soil, deeply ploughing and uniformly raking, wherein the adding amount of the potassium ferrate is 2-3 times of the molar amount of the halogenated hydrocarbon in the polluted soil;
s4, adding biomass substances into the soil treated in the step S3, and adjusting the pH value of the soil to be alkalescent; the biomass substance is prepared from rice hulls, peanut shells, coffee grounds and calcium oxide, wherein the weight ratio of the rice hulls to the peanut shells to the coffee grounds to the calcium oxide is 2-5: 1-3;
s5, adding a maintenance microbial inoculum into the soil treated in the step S4 for soil maintenance, wherein the maintenance microbial inoculum comprises pseudomonas stutzeri, bacillus licheniformis, pseudomonas perforatum, bacillus subtilis and aspergillus oryzae; the volume ratio of the pseudomonas stutzeri to the bacillus licheniformis to the pseudomonas perforatum to the bacillus subtilis to the aspergillus oryzae agent is 10-15: 20-30: 8-10: 10-15: 2-5; and (5) maintaining the soil for 30-60 days, and completing restoration after maintenance is finished.
2. The method for remediating halogenated hydrocarbon contaminated soil as recited in claim 1, wherein in step S2, the acidic substance is a dilute nitric acid solution.
3. The method for remediating halogenated hydrocarbon contaminated soil as claimed in claim 1, wherein in step S3, the potassium ferrate is added in divided amounts of 0.2-0.5 times the molar amount of the halogenated hydrocarbon in the contaminated soil.
4. The method for remediating halogenated hydrocarbon contaminated soil as recited in claim 1, wherein in the step S4, the weight ratio of the rice hulls to the peanut shells to the coffee grounds to the calcium oxide is 4:3:2: 2.
5. The method for remediating halogenated hydrocarbon contaminated soil as claimed in claim 1, wherein the method for preparing the biomass material in the step S4 comprises the steps of:
firstly, uniformly mixing rice hulls, peanut shells, coffee grounds and calcium oxide according to a ratio;
secondly, pyrolyzing the mixture for 180-250 min at the pressure of 0.2-1.0 KPa and the temperature of 300-400 ℃ to obtain a biomass material;
and thirdly, crushing the biomass material to obtain the biomass substance.
6. The method for remediating halogenated hydrocarbon contaminated soil as claimed in claim 1, wherein in the step S5, the volume ratio of the Pseudomonas stutzeri, Bacillus licheniformis, Pseudomonas perforati, Bacillus subtilis and Aspergillus oryzae agent is 12:25:9:12: 4.
7. The method for remediating halogenated hydrocarbon contaminated soil as claimed in claim 1, wherein in the step S5, the maintenance microbial inoculum is 200-400 mL/m3And (4) adding, and diluting when adding.
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