CN112387772A - Method for repairing chlorohydrocarbon polluted site by in-situ chemical oxidation - Google Patents
Method for repairing chlorohydrocarbon polluted site by in-situ chemical oxidation Download PDFInfo
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- 239000000126 substance Substances 0.000 title claims abstract description 37
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 31
- 230000003647 oxidation Effects 0.000 title claims abstract description 30
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 22
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 44
- 239000002689 soil Substances 0.000 claims abstract description 43
- 238000002347 injection Methods 0.000 claims abstract description 30
- 239000007924 injection Substances 0.000 claims abstract description 30
- 239000004568 cement Substances 0.000 claims abstract description 29
- 238000005507 spraying Methods 0.000 claims abstract description 29
- 239000004576 sand Substances 0.000 claims abstract description 24
- 239000000843 powder Substances 0.000 claims abstract description 13
- 239000000203 mixture Substances 0.000 claims abstract description 8
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 5
- 239000011790 ferrous sulphate Substances 0.000 claims description 31
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 31
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 31
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 31
- 150000008280 chlorinated hydrocarbons Chemical class 0.000 claims description 30
- 239000007788 liquid Substances 0.000 claims description 20
- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 claims description 15
- 239000004343 Calcium peroxide Substances 0.000 claims description 13
- LHJQIRIGXXHNLA-UHFFFAOYSA-N calcium peroxide Chemical compound [Ca+2].[O-][O-] LHJQIRIGXXHNLA-UHFFFAOYSA-N 0.000 claims description 13
- 235000019402 calcium peroxide Nutrition 0.000 claims description 13
- 239000003673 groundwater Substances 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 8
- 239000007800 oxidant agent Substances 0.000 abstract description 50
- 230000001590 oxidative effect Effects 0.000 abstract description 46
- 239000003054 catalyst Substances 0.000 abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 25
- 230000000694 effects Effects 0.000 abstract description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 2
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- 239000003814 drug Substances 0.000 abstract 3
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- 231100000719 pollutant Toxicity 0.000 description 11
- 230000008569 process Effects 0.000 description 7
- 239000003153 chemical reaction reagent Substances 0.000 description 6
- 230000009471 action Effects 0.000 description 4
- 238000006555 catalytic reaction Methods 0.000 description 4
- 239000003085 diluting agent Substances 0.000 description 4
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- 238000013508 migration Methods 0.000 description 4
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- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 238000005067 remediation Methods 0.000 description 2
- 239000011949 solid catalyst Substances 0.000 description 2
- UOCLXMDMGBRAIB-UHFFFAOYSA-N 1,1,1-trichloroethane Chemical compound CC(Cl)(Cl)Cl UOCLXMDMGBRAIB-UHFFFAOYSA-N 0.000 description 1
- QJZYHAIUNVAGQP-UHFFFAOYSA-N 3-nitrobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid Chemical compound C1C2C=CC1C(C(=O)O)C2(C(O)=O)[N+]([O-])=O QJZYHAIUNVAGQP-UHFFFAOYSA-N 0.000 description 1
- 206010007269 Carcinogenicity Diseases 0.000 description 1
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 1
- 239000012028 Fenton's reagent Substances 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 206010043275 Teratogenicity Diseases 0.000 description 1
- 239000008346 aqueous phase Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 231100000260 carcinogenicity Toxicity 0.000 description 1
- 230000007670 carcinogenicity Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 229960001701 chloroform Drugs 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007646 directional migration Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 239000004021 humic acid Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- MGZTXXNFBIUONY-UHFFFAOYSA-N hydrogen peroxide;iron(2+);sulfuric acid Chemical compound [Fe+2].OO.OS(O)(=O)=O MGZTXXNFBIUONY-UHFFFAOYSA-N 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000007886 mutagenicity Effects 0.000 description 1
- 231100000299 mutagenicity Toxicity 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000003900 soil pollution Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 231100000211 teratogenicity Toxicity 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- -1 trichloroethylene, tetrachloroethylene Chemical group 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
- B09C1/08—Reclamation of contaminated soil chemically
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/02—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only
- C09K17/06—Calcium compounds, e.g. lime
-
- 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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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Inorganic Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to a method for restoring a site polluted by chlorohydrocarbon through in-situ chemical oxidation, which comprises the following steps of firstly spraying fine sand into the ground by using a powder-spraying pile machine, improving the content of soil sand grains, improving the soil structure and achieving a better water permeation effect; then the mixture of the oxidant, the catalyst and the cement is sprayed underground by a powder spraying pile machine, and the medicament is wrapped into a cluster after the cement is solidified, so that the aim of slowly releasing the medicament is fulfilled; independently spraying fine sand into the ground by using a powder-spraying pile machine, spraying a mixture of a catalyst and cement into the ground by using the powder-spraying pile machine, and spraying the mixture into a downstream position of underground water; after the cement is cured, injecting hydrogen peroxide into the upstream position of the underground water through an injection well; the fine sand can improve the content of soil sand grains and the soil structure to achieve a better water permeation effect, the solidified cement wraps the oxidant and the catalyst to form a cluster, the dissolution of the medicament can be effectively delayed, and the water permeation structure formed by spraying the fine sand provides a good channel for the contact reaction of the hydrogen peroxide and the catalyst, so that the oxidation efficiency of the oxidant is improved.
Description
Technical Field
The invention relates to a method for restoring a site polluted by chlorohydrocarbon by in-situ chemical oxidation, belonging to the field of in-situ chemical oxidation methods of soil.
Background
Chlorinated hydrocarbon solvents are used as important chemical raw materials and organic solvents and widely applied to the chemical industry. Due to the reasons of inappropriate mass production, use and storage of chlorinated hydrocarbons, chlorinated hydrocarbons enter soil and underground water and become common pollutants in the environment, particularly trichloromethane, trichloroethane, trichloroethylene, tetrachloroethylene and the like. The chlorinated hydrocarbon generally has carcinogenicity, teratogenicity and mutagenicity, and the carbon-hydrogen bond energy of the chlorinated hydrocarbon is higher, so that the chlorinated hydrocarbon can exist in the environment for a long time, and the toxic effect on the human health and the ecological environment is increased. Chlorinated hydrocarbons are mostly heavy non-aqueous phase liquids, have the characteristics of low solubility and high density, and pollute soil and underground water by taking gravity infiltration as a main power when the chlorinated hydrocarbons are leaked or discharged to the surface and underground. When the gas-coated zone soil layer enters the underground water layer and meets the 'barrier layer' with smaller permeability coefficient, the gas-coated zone soil layer is easy to stay at the top of the barrier layer and transversely diffuses along with the flow of the underground water, and further the safe utilization of the underground water in a larger range is threatened.
In-situ chemical oxidation (ISCO) is a remediation technique that introduces a chemical oxidant into an underground water environment to undergo a redox reaction with a pollutant, so that the pollutant is degraded or converted into a low-toxicity and low-mobility product, and common oxidants include permanganate, hydrogen peroxide, fenton's reagent, persulfate, ozone, and the like. However, due to the complexity of the soil structure and chemical components, humic acid, reducing metals and other substances present in the soil consume a large amount of oxidizing agents. In addition, the chemical oxidizing agent is injected into the soil in an area with non-directional migration direction and range and poor soil layer permeability, so that the transmission rate of the chemical oxidizing agent is low, and the oxidation efficiency is affected.
Based on the problems in the prior art, the invention provides a method for repairing a typical chlorinated hydrocarbon polluted site in soil by in-situ chemical oxidation.
Disclosure of Invention
The invention provides a method for repairing a chlorinated hydrocarbon polluted site by in-situ chemical oxidation aiming at the defects in the prior art, and aims to solve the problems in the prior art.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a method for restoring a site polluted by chlorohydrocarbon by in-situ chemical oxidation comprises the following steps:
(1) firstly, spraying a fine sand powder spraying pile foundation into a specific soil depth to improve a soil mechanism and improve the water permeability of soil;
(2) uniformly mixing calcium peroxide, persulfate, ferrous sulfate and cement, spraying the mixture into the ground through a powder spraying pile machine, solidifying and wrapping the mixture into clusters by using the cement to form a coating-like effect, and prolonging the oxidation effect of an oxidant;
(3) spraying fine sand into soil of a polluted site by a dry method by using a powder spraying pile machine; then separately and uniformly mixing the ferrous sulfate catalyst and the cement, and spraying the mixture into the soil of the polluted site by a dry method through a powder spraying pile machine;
(4) after cement in the soil is solidified, hydrogen peroxide liquid oxidant is injected into the upstream area of underground water in the soil of the polluted site through an injection well and diffuses towards the downstream of underground water migration under the natural migration effect of the underground water.
(5) A plurality of injection wells are deployed in the field, and the ends of the injection wells do not penetrate the water barrier.
Furthermore, the adding amount of the fine sand in the step (1) is 50 kg-180 kg/m of each pile3。
Further, the molar ratio of the addition amount of the calcium oxide to the addition amount of the ferrous sulfate in the step (2) is 10-20: 1, and the molar ratio of the addition amount of the persulfate to the addition amount of the ferrous sulfate is 2-10: 1.
Further, the molar ratio of the total addition of the calcium peroxide and the persulfate in the step (2) to the content of the chlorinated hydrocarbon in the polluted soil is 8-10: 1; the mass ratio of the calcium peroxide to the persulfate is 1: 2-4.
Further, the adding amount of the cement in the step (2) is 60-150 kg/m of each pile3。
Further, the molar ratio of the adding amount of the ferrous sulfate in the step (3) to the adding amount of the hydrogen peroxide in the step (4) is 5-20: 1.
Further, the hydrogen peroxide in the step (4) is hydrogen peroxide liquid with the mass fraction of 20-30%; the molar ratio of the addition amount of the hydrogen peroxide to the content of the chlorinated hydrocarbon in the polluted soil is 5-10: 1.
Further, the adding amount of the fine sand in the step (3) is 50 kg-180 kg/m of each pile3。
Further, the adding amount of the cement in the step (3) is 60-150 kg/m of each pile3。
Further, the ferrous sulfate in the steps (2) and (3) has a particle size of 6-20 meshes.
The in-situ chemical oxidation repair technology adopts a mode of combining a solid chemical oxidant and a liquid chemical oxidant, uses calcium peroxide, persulfate and hydrogen peroxide as an oxidant group, and uses ferrous sulfate as a catalyst. The calcium peroxide and the persulfate are solid or powder particle reagents, the hydrogen peroxide is a liquid reagent with the concentration of 20-30%, and the ferrous sulfate is a solid particle reagent.
After being uniformly mixed with cement, the solid or powder particle oxidant and the solid particle catalyst are injected into soil in a spraying mode of a powder-spraying pile machine, and the cement achieves the effect similar to 'coating' after being solidified; the liquid reagent is injected into the underground through an injection well, and is mixed with soil and underground water to generate chemical oxidation reaction by utilizing the natural migration characteristic of the underground water.
According to the field pollution condition, a plurality of solid oxidant injection point positions can be distributed according to a grid method or a plum blossom method and the like, fine sand is injected underground in a preferential injection mode, and then the solid oxidant, the catalyst and the cement are mixed and injected underground. And (3) arranging an injection well according to the flow direction of underground water in the polluted site, and arranging a ferrous sulfate catalyst at the downstream position of the underground water of the injection well to form a finished product character.
The liquid reagent is injected underground through an injection well, the depth of the injection well does not penetrate through a water-resisting layer, and the situation that pollutants move downwards along with the injection well due to the fact that the injection well penetrates through the water-resisting layer is prevented, and the pollution depth and the pollution range are further expanded.
The liquid oxidant meets the slowly-released catalyst in the process of moving downstream under the action of groundwater dynamic force, so that a large number of hydroxyl free radicals can be released, the reaction rate of the oxidant is improved, and the reaction time of the oxidant and pollutants is prolonged. In addition, the slowly released catalyst encounters the released solid oxidant to carry out catalytic reaction again in the process of underground water migration, so that the oxidation efficiency of the solid oxidant is improved.
Compared with the prior art, the invention has the following beneficial effects because the technology is adopted:
1. according to the invention, the content of sand grains in the soil is increased through the injection of the fine sand, the soil structure is improved, and the water permeability of the soil is enhanced. The cement is solidified to form a solidified substance which can effectively wrap solid or powder chemical agents, the dissolution and release of the chemical agents are delayed, and the solidified substance can react with a hydrogen peroxide liquid oxidant injected into an injection well by matching with a good permeable structure formed by fine sand, so that the oxidation efficiency of a chemical oxidant group is further improved.
2. The catalyzed solid oxidant and the catalyzed liquid oxidant can obtain higher oxidation potential, calcium peroxide and hydrogen peroxide can release a large amount of hydroxyl free radicals to degrade chlorinated hydrocarbon pollutants, and the oxidation capacity of the hydrogen peroxide and persulfate is greatly improved under the catalytic action of ferrous sulfate.
3. The cement, the fine sand and the solid reagent injected by powder spraying are mixed with the natural soil body, the reference of the cement and the fine sand is controlled, the solidified structure can be formed but has lower strength, and the solid oxidant and the catalyst ferrous sulfate which are wrapped by the solidified cement can be slowly released after being eroded by underground water.
Drawings
Fig. 1 is a schematic view of the layout of a contaminated site.
Detailed Description
The invention is further elucidated with reference to the drawings and the detailed description.
Example 1:
a method for restoring a site polluted by chlorohydrocarbon by in-situ chemical oxidation comprises the following steps:
1. according to the situation of a polluted site, solid oxidant points and liquid oxidant injection wells are arranged at equal intervals according to a grid method.
2. The molar ratio of the total addition amount of the solid oxidant to the concentration of the chlorinated hydrocarbon site pollutants is 8:1, and the mass ratio of the calcium peroxide to the persulfate oxidant is 1: 2.
3. Before the solid oxidant is sprayed into the ground, the fine sand is firstly injected into the ground by using a powder-jet pile driver, and the injection quantity is 80kg/m per pile3。
4. The dosage of the catalyst ferrous sulfate injected underground along with the solid oxidant adopts: the molar ratio of the added calcium peroxide to the added ferrous sulfate is 20:1, and the molar ratio of the added persulfate to the added ferrous sulfate is 10: 1.
5. the dosage of the underground cement injected together with the solid oxidant is 90kg/m per pile3。
6. Before the ferrous sulfate catalyst is sprayed into the ground, the fine sand is injected into the ground by means of powder-spraying pile driver, and the injection quantity is 100kg/m per pile3。
7. The injection amount of the separately sprayed catalyst ferrous sulfate was: the molar ratio of the amount of the ferrous sulfate catalyst to the amount of the hydrogen peroxide liquid oxidant is 5: 1.
8. The dosage of the underground cement injected together with the solid catalyst is 60kg/m per pile3。
9. After cement is solidified, the total amount of the injected hydrogen peroxide liquid oxidant with the mass fraction of 28 percent is diluted into diluent with the volume fraction of 5 percent according to the mol ratio of 5:1 to the chlorinated hydrocarbon pollutant in the polluted soil, the diluent is injected into the upstream area of the underground water in the soil of the polluted site in 8 times of equal amount, the injection time interval is 7d, and the depth of an injection well does not penetrate through a water-resisting layer.
The liquid oxidant meets the slowly released catalyst in the process of moving downstream under the action of groundwater dynamic force, and the slowly released catalyst meets the released solid oxidant in the process of moving the groundwater to perform catalytic reaction again.
In this embodiment, the ferrous sulfate has a particle size of 6-20 mesh.
Example 2:
a method for restoring a site polluted by chlorohydrocarbon by in-situ chemical oxidation comprises the following steps:
1. according to the situation of a polluted site, solid oxidant points and liquid oxidant injection wells are arranged at equal intervals according to a plum blossom method.
2. The molar ratio of the total addition amount of the solid oxidant to the concentration of the chlorinated hydrocarbon site pollutant is 10:1, and the mass ratio of the calcium peroxide to the persulfate oxidant is 1: 4.
3. Before the solid oxidant is sprayed into the ground, the fine sand is firstly injected into the ground by using a powder-jet pile driver, and the injection quantity is 160kg/m per pile3。
4. The dosage of the catalyst ferrous sulfate injected underground along with the solid oxidant adopts: the molar ratio of the added calcium peroxide to the added ferrous sulfate is 10:1, and the molar ratio of the added persulfate to the added ferrous sulfate is 2: 1.
5. the dosage of the underground cement injected together with the solid oxidant is 100kg/m per pile3。
6. Before the ferrous sulfate catalyst is sprayed into the ground, the fine sand is injected into the ground by using a powder-spraying pile machine, and the injection amount is 120kg/m per pile3。
7. The injection amount of the separately sprayed catalyst ferrous sulfate was: the molar ratio of the amount of ferrous sulfate catalyst to the amount of liquid hydrogen peroxide oxidant added is 20: 1.
8. The dosage of the underground cement injected together with the solid catalyst is 80kg/m per pile3。
9. After cement is solidified, the total amount of injected hydrogen peroxide liquid oxidant with the mass fraction of 20 percent is diluted into diluent with the volume fraction of 4 percent according to the mol ratio of 10:1 to chlorinated hydrocarbon pollutant in the polluted soil, the diluent is injected into the upstream area of underground water in the soil of a polluted site in 10 times and equal amount, the injection time interval is 10d, and the depth of an injection well does not penetrate through a water-resisting layer.
The liquid oxidant meets the slowly released catalyst in the process of moving downstream under the action of groundwater dynamic force, and the slowly released catalyst meets the released solid oxidant in the process of moving the groundwater to perform catalytic reaction again.
In this embodiment, the ferrous sulfate has a particle size of 6-20 mesh.
The liquid oxidant meets the slowly released catalyst in the process of moving downstream under the action of groundwater dynamic force, and the slowly released catalyst and the solid oxidant released downstream of groundwater movement are subjected to catalytic reaction again.
TABLE 1 monitoring results of the concentration of pollutants in the soil for chemical oxidation remediation of chlorinated hydrocarbons in a chemical field
Note: the restoration target value is a screening value of a second-class land according to soil pollution risk management and control standard (trial) of soil environment quality construction land (GB 36600-2018).
The above-mentioned embodiments are merely preferred embodiments of the present invention, and should not be construed as limiting the present invention, and the scope of the present invention should be defined by the claims, and equivalents including technical features of the claims, i.e., equivalent modifications within the scope of the present invention.
Claims (10)
1. The method for repairing the site polluted by the chlorinated hydrocarbon through in-situ chemical oxidation is characterized by comprising the following steps of:
(1) firstly, fine sand is sprayed into soil of a polluted site by a powder spraying pile machine in a dry method;
(2) uniformly mixing calcium peroxide, persulfate, ferrous sulfate and cement, and spraying the mixture into soil by a powder spraying pile machine in a dry method;
(3) spraying fine sand into soil of a polluted site by a dry method by using a powder spraying pile machine; uniformly mixing ferrous sulfate and cement, and spraying the mixture into the soil of the polluted site by a powder spraying pile machine in a dry method;
(4) after the cement injected into the soil is cured, hydrogen peroxide is injected into the upstream area of the groundwater in the soil of the contaminated site through the injection well.
2. The method for repairing the site polluted by the chlorinated hydrocarbon through in-situ chemical oxidation according to claim 1, wherein the method comprises the following steps: the adding amount of the fine sand in the step (1) is 50 kg-180 kg/m of each pile3。
3. The method for repairing the site polluted by the chlorinated hydrocarbon through in-situ chemical oxidation according to claim 1, wherein the method comprises the following steps: in the step (2), the molar ratio of the addition amount of the calcium peroxide to the addition amount of the ferrous sulfate is 10-20: 1, and the molar ratio of the addition amount of the persulfate to the addition amount of the ferrous sulfate is 2-10: 1.
4. The method for repairing the site polluted by the chlorinated hydrocarbon through in-situ chemical oxidation according to claim 1, wherein the method comprises the following steps: the molar ratio of the total addition of the calcium peroxide and the persulfate in the step (2) to the content of the chlorinated hydrocarbon in the polluted soil is 8-10: 1.
5. The method for repairing the site polluted by the chlorinated hydrocarbon through in-situ chemical oxidation according to claim 1, wherein the method comprises the following steps: the adding amount of the cement in the step (2) is 60-150 kg/m of each pile3。
6. The method for repairing the site polluted by the chlorinated hydrocarbon through in-situ chemical oxidation according to claim 1, wherein the method comprises the following steps: the molar ratio of the adding amount of the ferrous sulfate in the step (3) to the adding amount of the hydrogen peroxide in the step (4) is 5-20: 1.
7. The method for repairing the site polluted by the chlorinated hydrocarbon through in-situ chemical oxidation as claimed in claim 1 or 6, wherein: hydrogen peroxide in the step (4) is hydrogen peroxide liquid with the mass fraction of 20-30%; the molar ratio of the addition amount of the hydrogen peroxide to the content of the chlorinated hydrocarbon in the polluted soil is 5-10: 1.
8. The method for repairing the site polluted by the chlorinated hydrocarbon through in-situ chemical oxidation according to claim 1, wherein the method comprises the following steps: the adding amount of the fine sand in the step (3) is 50 kg-180 kg/m of each pile3(ii) a The adding amount of the cement is 60-150 kg/m of each pile3。
9. The method for repairing the site polluted by the chlorinated hydrocarbon through in-situ chemical oxidation according to claim 1, wherein the method comprises the following steps: the ferrous sulfate in the steps (2) and (3) has a particle size of 6-20 meshes.
10. The method for repairing the site polluted by the chlorinated hydrocarbon through in-situ chemical oxidation according to claim 1, wherein the method comprises the following steps: and (4) a plurality of injection wells are arranged in the polluted site in the step (4), and the tail ends of the injection wells do not penetrate through the water-resisting layer.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103787485A (en) * | 2014-02-25 | 2014-05-14 | 华东理工大学 | Method of removing chlorohydrocarbon in underground water by using alkaline slow-release persulfate oxidizing agent |
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Denomination of invention: A method for in-situ chemical oxidation remediation of chlorinated hydrocarbon contaminated sites Effective date of registration: 20231224 Granted publication date: 20220603 Pledgee: Bank of China Limited Nanjing Jiangbei New Area Branch Pledgor: NANJING GREEN-WATER ENVIRONMENT ENGINEERING LIMITED BY SHARE Ltd. Registration number: Y2023980073501 |