CN113305142A - Method for efficiently repairing soil petroleum hydrocarbon pollution - Google Patents
Method for efficiently repairing soil petroleum hydrocarbon pollution Download PDFInfo
- Publication number
- CN113305142A CN113305142A CN202110317334.1A CN202110317334A CN113305142A CN 113305142 A CN113305142 A CN 113305142A CN 202110317334 A CN202110317334 A CN 202110317334A CN 113305142 A CN113305142 A CN 113305142A
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- CN
- China
- Prior art keywords
- soil
- petroleum hydrocarbon
- activation
- reaction
- oxidation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000002689 soil Substances 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000003209 petroleum derivative Substances 0.000 title claims abstract description 17
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 35
- 230000004913 activation Effects 0.000 claims abstract description 26
- 239000000292 calcium oxide Substances 0.000 claims abstract description 22
- 235000012255 calcium oxide Nutrition 0.000 claims abstract description 22
- 238000006243 chemical reaction Methods 0.000 claims abstract description 20
- 230000003647 oxidation Effects 0.000 claims abstract description 17
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 17
- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical compound NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 claims abstract description 15
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 claims abstract description 15
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 12
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 12
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 12
- 239000000243 solution Substances 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000003513 alkali Substances 0.000 claims abstract description 6
- 230000000694 effects Effects 0.000 claims abstract description 6
- 229910004882 Na2S2O8 Inorganic materials 0.000 claims abstract description 5
- 230000002378 acidificating effect Effects 0.000 claims abstract description 5
- 239000012670 alkaline solution Substances 0.000 claims abstract description 5
- 238000003776 cleavage reaction Methods 0.000 claims abstract description 5
- 239000007788 liquid Substances 0.000 claims abstract description 5
- 230000007935 neutral effect Effects 0.000 claims abstract description 5
- 230000003472 neutralizing effect Effects 0.000 claims abstract description 5
- 230000007017 scission Effects 0.000 claims abstract description 5
- 230000000295 complement effect Effects 0.000 claims abstract description 4
- 238000004140 cleaning Methods 0.000 claims abstract 2
- 239000000203 mixture Substances 0.000 claims description 18
- 239000002245 particle Substances 0.000 claims description 5
- 238000012423 maintenance Methods 0.000 claims description 4
- 239000000356 contaminant Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 claims description 2
- 238000010517 secondary reaction Methods 0.000 claims description 2
- 239000003344 environmental pollutant Substances 0.000 abstract description 2
- 231100000719 pollutant Toxicity 0.000 abstract description 2
- 238000001994 activation Methods 0.000 description 18
- 239000000126 substance Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000007800 oxidant agent Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 238000005067 remediation Methods 0.000 description 2
- 239000012028 Fenton's reagent Substances 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- -1 calcium oxide activated sodium persulfate Chemical class 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000011790 ferrous sulphate Substances 0.000 description 1
- 235000003891 ferrous sulphate Nutrition 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
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 1
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 1
- 231100001231 less toxic Toxicity 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- JRKICGRDRMAZLK-UHFFFAOYSA-L persulfate group Chemical class S(=O)(=O)([O-])OOS(=O)(=O)[O-] JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 description 1
- 239000012286 potassium permanganate Substances 0.000 description 1
- 238000003900 soil pollution Methods 0.000 description 1
- 238000007725 thermal activation Methods 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
The invention discloses a method for efficiently remedying soil petroleum hydrocarbon pollution, which comprises the following steps: cleaning, mixing and maintaining. The calcium oxide reacts with water to generate calcium hydroxide, a large amount of heat is released in the reaction process, and the calcium hydroxide is strong in basicity, so that the sodium persulfate activated by the quick lime can provide the complementary activation effects of alkali activation and heat activation, and Na2S2O8First neutralizing OH in the liquid phase–Reaction to OH2–Then with S2O8 2–The reaction results in the cleavage of the-O-bond to form SO4–Under acidic and neutral conditions (pH = 2-7) to produce SO4–Predominantly and relatively stable in solution, SO4 in solution at pH > 8.5–Then oxidation of water or OH－OH is gradually formed and the ratio is increased, while OH is mainly generated in an alkaline solution (pH > 12), and SO is generated due to the oxidation ratio of OH4 –Stronger, breaking of-O-bonds to SO4 –Is generated therebyThe oxidation of the pollutants is realized.
Description
Technical Field
The invention relates to the technical field of soil pollution remediation, in particular to a method for efficiently remedying soil petroleum hydrocarbon pollution.
Background
Chemical oxidation technology is to add/inject chemical oxidant into soil, and to oxidize the pollutant in soil into non-toxic or less toxic matter through oxidation. In recent years, chemical oxidation technology has made great progress in the application of organic contaminated soil, and a remarkable repairing effect is exhibited. And the selection of a proper oxidant is one of the key factors determining the soil remediation efficiency. Chemical oxidants currently used in the degradation of organic pollutants include Fenton's reagent, O3, potassium permanganate, activated persulfate, and the like.
The main activators used at the present stage are ferrous sulfate, sodium hydroxide and the like. In engineering application, the activation efficiency is low, secondary pollution is easy to cause, and engineering construction control is difficult, so that the requirements on economy and environmental protection can not be met.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a method for efficiently remedying the petroleum hydrocarbon pollution of soil.
In order to achieve the purpose, the invention adopts the following technical scheme: 7-10 parts of sodium persulfate; 7-10 parts of quicklime; 20-25 parts of polluted soil.
The invention provides a method for efficiently remedying soil petroleum hydrocarbon pollution, which comprises the following steps:
s1, removing large particles from the polluted soil through a 400-plus-450-mesh filter screen, putting the screened polluted soil, sodium persulfate and quicklime into a mixer, and adjusting the rotating speed of the mixer to 140r/min through a starting device, so that the mixture is uniformly mixed;
and S2, closing the device, taking out the mixture inside, placing the mixture inside a beaker, and placing the mixed soil inside a curing device for curing.
Preferably, the contaminated soil has an internal water content of 30% and the sodium persulfate concentration is maintained at 3%, and the mixed soil is maintained at room temperature for 5 to 7 days.
Preferably, calcium oxide reacts with water to form calcium hydroxide, and a large amount of heat is released in the reaction process, because the calcium hydroxide is strongly alkaline, the calcium oxide activated sodium persulfate can provide the complementary activation effects of alkali activation and heat activation at the same time, and the reaction formula is as follows:
CaO+H2O=Ca(OH)2。
preferably, the alkali activation is a secondary reaction, Na2S2O8First neutralizing OH in the liquid phase–Reaction to OH2–Then with S2O8 2–The reaction results in the cleavage of the-O-bond to form SO4–Under acidic and neutral conditions (pH = 2-7) to produce SO4–Predominantly and relatively stable in solution, SO in solutions with a pH > 8.54 –Then oxidation of water or OH－OH is gradually formed and the ratio is increased, while OH is mainly generated in an alkaline solution (pH > 12), and SO is generated due to the oxidation ratio of OH4 –Stronger, and therefore the degradability of the system also increases with increasing basicity, the main formula being:
2S2O8 2–+2H2O→ SO4 –+ 3SO4 2–·+O2 –·+ 4H+
SO4 –·+OH–→ SO4 2–+OH·。
the method for efficiently remediating soil petroleum hydrocarbon pollution as recited in claim 1, wherein: high temperature provides sufficient activation energy to break the-O-bond to result in SO4 –Thereby effecting oxidation of the contaminant, the main formula being:
S2O8 2–+heat→ 2SO4 –·。
compared with the prior art, the method for efficiently remedying the soil petroleum hydrocarbon pollution provided by the invention has the advantages that calcium hydroxide is generated through the reaction of calcium oxide and water, and a large amount of heat is released in the reaction process because calcium oxide reacts with waterThe calcium hydroxide is strongly alkaline, so that the activation of the sodium persulfate by the quick lime can simultaneously provide the complementary activation effects of alkali activation and heat activation, namely Na2S2O8First neutralizing OH in the liquid phase–Reaction to OH2–Then with S2O8 2–The reaction results in the cleavage of the-O-bond to form SO4–Under acidic and neutral conditions (pH = 2-7) to produce SO4–Predominantly and relatively stable in solution, SO in solutions with a pH > 8.54 –Then oxidation of water or OH－OH is gradually formed and the ratio is increased, while OH is mainly generated in an alkaline solution (pH > 12), and SO is generated due to the oxidation ratio of OH4 –Stronger, SO that the degradability of the system also increases with increasing basicity, and the high temperature provides sufficient activation energy to break the-O-bond and cause SO4 –The activation method adopts calcium oxide, has mild reaction, can improve the activation efficiency of sodium persulfate, reduces the difficulty of engineering application and reduces the danger in the construction process.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. The specific embodiments described herein are merely illustrative of the invention and do not delimit the invention.
Example 1
A method for efficiently remedying soil petroleum hydrocarbon pollution comprises the following steps:
s1, removing large particles from the polluted soil through a 400-mesh filter screen, putting the screened polluted soil, sodium persulfate and quicklime into a mixer, and adjusting the rotating speed of the mixer to 120r/min through a starting device so as to uniformly mix the mixture;
s2, closing the device, taking out the mixture inside, placing the mixture inside a beaker, and placing the mixed soil inside a maintenance device for maintenance;
example 2
A method for efficiently remedying soil petroleum hydrocarbon pollution comprises the following steps:
s1, removing large particles from the polluted soil through a 420-mesh filter screen, putting the screened polluted soil, sodium persulfate and quicklime into a mixer, and adjusting the rotating speed of the mixer to 130r/min through a starting device so as to uniformly mix the mixture;
and S2, closing the device, taking out the mixture inside, placing the mixture inside a beaker, and placing the mixed soil inside a curing device for curing.
Example 3
A method for efficiently remedying soil petroleum hydrocarbon pollution comprises the following steps:
s1, removing large particles from the polluted soil through a 450-mesh filter screen, putting the screened polluted soil, sodium persulfate and quicklime into a mixer, and adjusting the rotating speed of the mixer to 140r/min through a starting device so as to uniformly mix the mixture;
and S2, closing the device, taking out the mixture inside, placing the mixture inside a beaker, and placing the mixed soil inside a curing device for curing.
In summary, the following steps: the invention relates to a method for efficiently remedying petroleum hydrocarbon pollution of soil, which is characterized in that calcium oxide reacts with water to generate calcium hydroxide, a large amount of heat is released in the reaction process, and because the calcium hydroxide is strong alkaline, the sodium persulfate activated by quicklime can simultaneously provide the auxiliary activation effects of alkaline activation and thermal activation, and Na2S2O8First neutralizing OH in the liquid phase–Reaction to OH2–Then with S2O8 2–The reaction results in the cleavage of the-O-bond to form SO4–Under acidic and neutral conditions (pH = 2-7) to produce SO4–Predominantly and relatively stable in solution, SO in solutions with a pH > 8.54 –Then oxidation of water or OH－OH is gradually formed and the ratio is increased, while OH is mainly generated in an alkaline solution (pH > 12), and SO is generated due to the oxidation ratio of OH4 –Stronger, SO that the degradability of the system also increases with increasing basicity, and the high temperature provides sufficient activation energy to break the-O-bond and cause SO4 –Thereby effecting oxidation of the contaminants.
The activation method adopts calcium oxide, the reaction is mild, the activation efficiency of sodium persulfate can be improved, the difficulty of engineering application is reduced, and the danger in the construction process is reduced.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (5)
1. A method for efficiently remedying the petroleum hydrocarbon pollution of soil is characterized by comprising 7 to 10 parts of sodium persulfate; 7-10 parts of quicklime; 20-25 parts of polluted soil;
the method comprises the following steps:
s1, cleaning and mixing; firstly, removing large particles from the polluted soil through a 400-plus-450-mesh filter screen, putting the screened polluted soil, sodium persulfate and quick lime into a mixer, and adjusting the rotating speed of the mixer to 140r/min through a starting device, so that the mixture is uniformly mixed;
s2, maintaining; and then closing the device, taking out the mixture inside, placing the mixture inside a beaker, and placing the mixed soil inside a maintenance device for maintenance.
2. The method for efficiently remediating soil petroleum hydrocarbon pollution as recited in claim 1, wherein: the water content in the polluted soil is 30%, the concentration of the sodium persulfate is kept at 3%, and the mixed soil is maintained at normal temperature for 5-7 days.
3. The method for efficiently remediating soil petroleum hydrocarbon pollution as recited in claim 1, wherein: calcium oxide reacts with water to generate calcium hydroxide, a large amount of heat is released in the reaction process, and the calcium hydroxide is strong in basicity, so that the sodium persulfate activated by the quick lime can provide the alkali activation and heat activation complementary activation effects at the same time, and the reaction formula is as follows:
CaO+H2O=Ca(OH)2。
4. the method for efficiently remediating soil petroleum hydrocarbon pollution as recited in claim 1, wherein: alkali activation is a secondary reaction, Na2S2O8First neutralizing OH in the liquid phase–Reaction to OH2–Then with S2O8 2–The reaction results in the cleavage of the-O-bond to form SO4–Under acidic and neutral conditions (pH = 2-7) to produce SO4–Predominantly and relatively stable in solution, SO in solutions with a pH > 8.54 –Then oxidation of water or OH－OH is gradually formed and the ratio is increased, while OH is mainly generated in an alkaline solution (pH > 12), and SO is generated due to the oxidation ratio of OH4 –Stronger and therefore the degradability of the system also increases with increasing alkalinity,
the main formula is as follows:
2S2O8 2–+2H2O→ SO4 –+ 3SO4 2–·+O2 –·+ 4H+
SO4 –·+OH–→ SO4 2–+OH·。
5. the method for efficiently remediating soil petroleum hydrocarbon pollution as recited in claim 1, wherein: high temperature provides sufficient activation energy to break the-O-bond to result in SO4 –Thereby effecting oxidation of the contaminants,
the main formula is as follows:
S2O8 2–+heat→ 2SO4 –·。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110317334.1A CN113305142A (en) | 2021-03-25 | 2021-03-25 | Method for efficiently repairing soil petroleum hydrocarbon pollution |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110317334.1A CN113305142A (en) | 2021-03-25 | 2021-03-25 | Method for efficiently repairing soil petroleum hydrocarbon pollution |
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| CN113305142A true CN113305142A (en) | 2021-08-27 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113770170A (en) * | 2021-09-16 | 2021-12-10 | 生态环境部南京环境科学研究所 | Electric diffusion-electric heating coupling method for repairing organic contaminated soil |
| CN113787093A (en) * | 2021-09-14 | 2021-12-14 | 中国科学院武汉岩土力学研究所 | Method for repairing organic polluted soil by activating sodium persulfate through carbide slag loaded with bacillus |
| CN114871265A (en) * | 2022-04-27 | 2022-08-09 | 北京高能时代环境技术股份有限公司 | Ectopic thermal desorption enhanced chemical oxidation method for repairing polycyclic aromatic hydrocarbon polluted soil |
| CN115433584A (en) * | 2022-08-17 | 2022-12-06 | 吉林建筑大学 | Calcium peroxide-sodium persulfate synergistic in-situ remediation method for organic composite polluted site |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113787093A (en) * | 2021-09-14 | 2021-12-14 | 中国科学院武汉岩土力学研究所 | Method for repairing organic polluted soil by activating sodium persulfate through carbide slag loaded with bacillus |
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| CN114871265A (en) * | 2022-04-27 | 2022-08-09 | 北京高能时代环境技术股份有限公司 | Ectopic thermal desorption enhanced chemical oxidation method for repairing polycyclic aromatic hydrocarbon polluted soil |
| CN115433584A (en) * | 2022-08-17 | 2022-12-06 | 吉林建筑大学 | Calcium peroxide-sodium persulfate synergistic in-situ remediation method for organic composite polluted site |
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Application publication date: 20210827 |