CN111872100A - Method for restoring petroleum hydrocarbon contaminated soil - Google Patents
Method for restoring petroleum hydrocarbon contaminated soil Download PDFInfo
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- CN111872100A CN111872100A CN202010671054.6A CN202010671054A CN111872100A CN 111872100 A CN111872100 A CN 111872100A CN 202010671054 A CN202010671054 A CN 202010671054A CN 111872100 A CN111872100 A CN 111872100A
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- soil
- sodium persulfate
- petroleum hydrocarbon
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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
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Abstract
A method for restoring soil polluted by petroleum hydrocarbon relates to the field of environmental protection, in particular to the restoration of the soil polluted by the petroleum hydrocarbon. The method comprises the following steps: air drying, grinding and uniformly mixing the polluted soil; adding a medicament into the polluted soil; and maintaining for a certain time and then sending for inspection and analysis. The chemical adding mode adopts four different treatment modes, through inspection and analysis of repaired polluted soil, firstly adding alkali and sodium persulfate, then adding water to make slurry, wherein the treatment effect is optimal, the optimal chemical adding ratio is that the sodium persulfate and the caustic soda are added in a ratio of 4% in a ratio of 1:1, the content of total petroleum hydrocarbon in the adsorbed polluted soil is reduced from 12800mg/kg to 2047mg/kg, which is far lower than the standard value of 4500mg/kg, and the effect is ideal.
Description
Technical Field
The invention relates to the field of environmental protection, in particular to remediation of soil polluted by petroleum hydrocarbons.
Background
The contaminated soil is taken from a certain original carbon black production plot, and the plot produces a large amount of carbon black for rubber and pigment carbon black products, wherein the carbon black production process comprises the following steps: raw oil and fuel oil are respectively dehydrated and stored, during production, the raw oil and the fuel oil are directly conveyed into a reaction furnace from a storage tank and are incompletely combusted in the reaction furnace, meanwhile, a structural inhibitor (potassium carbonate) is added, after carbon black and combustion flue gas are generated, quenching water is immediately sprayed into the furnace to stop reaction, the carbon black and the combustion flue gas enter a carbon black collecting system, the obtained powdered carbon black enters a granulator (adopting dry granulation), the powdered carbon black freely rolls and collides in the granulator to form carbon black granules under the action of intermolecular force, and then the carbon black granules are packaged to obtain the finished carbon black. Carbon black dust and tail gas generated in the production process are collected and treated by a dust removal device and then discharged. Raw and auxiliary materials of the old production process of the carbon black for the rubber mainly comprise ethylene tar, coal tar, heavy oil, potassium carbonate and the like, and a large amount of petroleum substances used in the production process finally cause the soil of the land to be enriched with a large amount of petroleum hydrocarbon pollutants.
At present, common treatment technologies for soil petroleum hydrocarbon pollution include an in-situ/ex-situ chemical oxidation technology, a normal-temperature desorption technology, an ex-situ thermal desorption technology, a leaching treatment technology, a cement kiln co-processing technology and the like, and various technologies can theoretically effectively treat the petroleum hydrocarbon pollutants and have advantages and disadvantages.
Disclosure of Invention
The invention provides a method for repairing soil polluted by petroleum hydrocarbon, which aims at the soil petroleum hydrocarbon pollutants, obtains an optimal dosing mode by screening the amount of an added medicament and ensures that the repaired soil reaches the qualified standard.
In order to achieve the purpose, the invention adopts the technical scheme that:
a method for repairing petroleum hydrocarbon contaminated soil comprises air drying the contaminated soil, grinding, and mixing; adding a medicament into the polluted soil; and maintaining for a certain time and then sending for inspection and analysis.
The medicament is sodium hydroxide and sodium persulfate.
Furthermore, the dosing mode of the polluted soil is to dose sodium hydroxide first and then dose sodium persulfate immediately.
Or the contaminated soil is added with the chemical in a mode that sodium hydroxide is added firstly, the mixture is uniformly mixed and then reacts for 20-60 hours, and then sodium persulfate is added. Furthermore, the reaction time is 24-48 hours. Specifically, the reaction time is 20 hours; 24 hours; 30 hours; 36 hours; 48 hours; one of 60 hours.
Or the chemical adding mode of the polluted soil is to add sodium hydroxide and sodium persulfate into the polluted soil in sequence and then add water for pulping.
Or the contaminated soil is added with the agent by adding two agents of sodium hydroxide and sodium persulfate in sequence, and then adding a proper amount of hot water at 50-70 ℃ for pulping. Furthermore, the temperature of hot water added in the invention is 55-65 ℃. Specifically, the temperature of the added hot water is 50 ℃; 55 ℃; 60 ℃; 65 ℃; at 70 ℃.
Further, the sample is placed at normal temperature after being fully stirred, maintained for 7-10 days, and then sampled and analyzed. Specifically, the curing time is 7 days; 8 days; 9 days; for 10 days.
Furthermore, the adding amount of the sodium hydroxide and the sodium persulfate is 1: 1.
Furthermore, the addition amount of the sodium persulfate is 1-4% of the mass percentage of the soil. Furthermore, the adding amount of the sodium persulfate is 3-4% of the mass percentage. Specifically, the adding amount of sodium persulfate is 1 percent of the mass percent; 2 percent; 3 percent; 4% of the total weight of the composition.
The invention provides a method for restoring petroleum hydrocarbon polluted soil, which comprises the following steps:
1) collecting a soil sample, then air-drying, grinding and uniformly mixing the soil sample, and fully and uniformly mixing the soil sample to be used as a test sample for later use;
2) four sets of tests are set, each set of test is provided with 3 parallel samples with the same conditions, and the first set of reaction conditions is normal dosing; the second group is that sodium hydroxide is added firstly, the mixture is uniformly mixed and then reacts for 20 to 60 hours, and then sodium persulfate is added; the third group of reaction conditions comprises adding two medicaments in sequence, and then adding a proper amount of water for pulping; the fourth group of reaction conditions comprises adding two medicaments in sequence, and then adding a proper amount of hot water at 50-70 ℃ for pulping;
3) and (3) fully stirring all the samples of the test groups, then placing the samples at normal temperature, maintaining for 7-10 days, and then sampling and analyzing.
Wherein, the step 2) is that after two medicaments are added in sequence, a proper amount of water is added for pulping; the chemical agents are sodium hydroxide and sodium persulfate, and the adding amount of the sodium hydroxide and the sodium persulfate is 1: 1.
Further, the addition amount of the sodium persulfate is 4 percent of the mass percent of the soil.
Further, the curing time in the step 3) is 7 days.
The invention has the beneficial effects that: the invention is related to petroleum hydrocarbon (C)10-C40) And (3) performing a grouping test on the polluted soil, determining different modes of adding sodium hydroxide and sodium persulfate, and determining an optimal remediation scheme. The method realizes the restoration of the polluted soil, various different dosing modes have certain influence on the treatment effect of the chemical oxidation method, the dosing mode of firstly adding alkali and sodium persulfate and then adding water for slurrying has the best treatment effect, the optimal dosing ratio is that the sodium persulfate and the caustic soda are added in a ratio of 1:1, the content of the total petroleum hydrocarbon in the adsorbed polluted soil is reduced from 12800mg/kg to 2047mg/kg at the lowest, which is far lower than the standard value of 4500mg/kg, and the effect is ideal.
Detailed Description
The invention aims at the land for producing carbon black for rubber and pigment carbon black products in a certain land parcel, and the land parcel mainly contains petroleum hydrocarbon (C)10-C40) And (4) pollution. The raw and auxiliary materials and the product list of the old production process of the carbon black for the rubber are shown in the table 1,
table 1: raw and auxiliary materials and product list of old production process of carbon black for rubber
Wherein:
ethylene tar is a byproduct obtained in the process of producing ethylene by cracking hydrocarbons, contains more indene, methylindene and homologues thereof, naphthalene, methylnaphthalene, ethylnaphthalene, dimethylnaphthalene, benzene, anthracene, acenaphthene and other components, can be used as a raw material for producing carbon black, and can also be used as industrial boiler fuel.
Coal tar is a black viscous liquid, has a smell similar to naphthalene or aromatic hydrocarbon, is mainly a mixture of aromatic hydrocarbon and heterocyclic compound, is mainly used for fractionating various aromatic hydrocarbons such as benzene, toluene, xylene, naphthalene, anthracene and the like, aromatic oxygen-containing compounds, alkane and phenol compounds and the like, and can be used for manufacturing other fuels or medicines.
Heavy oil, also called fuel oil, is the residual heavy oil after extracting gasoline and diesel oil from crude oil, and its components are mainly hydrocarbons, in addition, it also contains partial sulfur and trace inorganic compounds.
Quenching water, in the process water in the carbon black production process, the quenching water (clear water) is used for stopping the cracking reaction of the raw materials, then exists in the purified tail gas in the form of water vapor, and is finally discharged into the atmosphere.
Potassium carbonate, white granules or powder, odorless, hygroscopic, low-toxicity, and half-lethal (rat, oral) 1.87 g/kg. When the potassium carbonate solution is used, potassium carbonate is added into the tank body to prepare a solution, and the solution is added into a reaction furnace by taking compressed air as power to serve as a structural inhibitor during carbon black production, so that the solution does not cause environmental pollution to land parcels.
The production process uses a large amount of petroleum substances, and finally the soil of the land is enriched with a large amount of petroleum hydrocarbon pollutants. The soil of the petroleum hydrocarbon polluted land is selected as a research object in the research, and the soil remediation method of the petroleum hydrocarbon polluted land is determined.
The invention relates to a method for restoring petroleum hydrocarbon polluted soil, which comprises the following steps:
(1) collecting a soil sample, then air-drying, grinding and uniformly mixing the soil sample, and fully and uniformly mixing the soil sample to be used as a test sample for later use;
(2) four sets of tests are set, each set of test is provided with 3 parallel samples with the same conditions, and the first set of reaction conditions is normal dosing; the second group is that sodium hydroxide is added firstly, the mixture is uniformly mixed and then reacts for 20 to 60 hours, and then sodium persulfate is added; the third group of reaction conditions comprises adding two medicaments in sequence, and then adding a proper amount of water for pulping; the fourth group of reaction conditions comprises adding two medicaments in sequence, and then adding a proper amount of hot water at 50-70 ℃ for pulping;
(3) and (3) fully stirring all the samples of the test groups, then placing the samples at normal temperature, maintaining for 7-10 days, and then sampling and analyzing.
The present invention is defined by the above steps and further illustrated by the following examples.
Example 1:
(1) collecting soil samples, air-drying, grinding, mixing,
(2) adding alkali, then immediately adding sodium persulfate, and uniformly stirring, wherein the adding amount of sodium hydroxide and sodium persulfate is 1: 1. The adding amount of the sodium persulfate is 1 percent of the mass percent of the soil.
(3) And (3) fully stirring the sample in the step (2), then placing at normal temperature, maintaining for 7d, and then sampling for inspection and analysis.
Example 2:
(1) collecting soil samples, air-drying, grinding, mixing,
(2) adding alkali, then immediately adding sodium persulfate, and uniformly stirring, wherein the adding amount of sodium hydroxide and sodium persulfate is 1: 1. The adding amount of the sodium persulfate is 2 percent of the mass percent of the soil.
(3) And (3) fully stirring the sample in the step (2), then placing at normal temperature, maintaining for 8d, and then sampling for inspection and analysis.
Example 3:
(1) collecting soil samples, air-drying, grinding, mixing,
(2) adding alkali, then immediately adding sodium persulfate, and uniformly stirring, wherein the adding amount of sodium hydroxide and sodium persulfate is 1: 1. The adding amount of the sodium persulfate is 3 percent of the mass percentage of the soil.
(3) And (3) fully stirring the sample in the step (2), then placing at normal temperature, maintaining for 9 days, and then sampling for inspection and analysis.
Example 4:
(1) collecting soil samples, air-drying, grinding, mixing,
(2) adding alkali, then immediately adding sodium persulfate, and uniformly stirring, wherein the adding amount of sodium hydroxide and sodium persulfate is 1: 1. The addition of the sodium persulfate is 4 percent of the mass percent of the soil.
(3) And (3) fully stirring the sample in the step (2), then placing the sample at normal temperature, maintaining for 10 days, and then sampling for inspection and analysis.
Example 5:
(1) collecting soil samples, air-drying, grinding, mixing,
(2) firstly adding alkali, uniformly stirring, adding sodium persulfate after 20 hours, and uniformly stirring. Wherein the adding amount of the sodium hydroxide and the sodium persulfate is 1:1, and the adding amount of the sodium persulfate is 1 percent of the mass percent of the soil.
(3) And (3) fully stirring the sample in the step (2), then placing at normal temperature, maintaining for 7d, and then sampling for inspection and analysis.
Example 6:
(1) collecting soil samples, air-drying, grinding, mixing,
(2) firstly adding alkali, uniformly stirring, adding sodium persulfate after 24 hours, and uniformly stirring. Wherein the adding amount of the sodium hydroxide and the sodium persulfate is 1:1, and the adding amount of the sodium persulfate is 2 percent of the mass percent of the soil.
(3) And (3) fully stirring the sample in the step (2), then placing at normal temperature, maintaining for 8d, and then sampling for inspection and analysis.
Example 7:
(1) collecting soil samples, air-drying, grinding, mixing,
(2) firstly adding alkali, uniformly stirring, adding sodium persulfate after 36h, and uniformly stirring. Wherein the adding amount of the sodium hydroxide and the sodium persulfate is 1:1, and the adding amount of the sodium persulfate is 3 percent of the mass percent of the soil.
(3) And (3) fully stirring the sample in the step (2), then placing at normal temperature, maintaining for 9 days, and then sampling for inspection and analysis.
Example 8:
(1) collecting soil samples, air-drying, grinding, mixing,
(2) firstly adding alkali, uniformly stirring, adding sodium persulfate after 48 hours, and uniformly stirring. Wherein the adding amount of the sodium hydroxide and the sodium persulfate is 1:1, and the adding amount of the sodium persulfate is 4 percent of the mass percent of the soil.
(3) And (3) fully stirring the sample in the step (2), then placing the sample at normal temperature, maintaining for 10 days, and then sampling for inspection and analysis.
Example 9:
(1) collecting soil samples, air-drying, grinding, mixing,
(2) firstly adding alkali, then immediately adding sodium persulfate, then adding water to make slurry, and uniformly stirring. Wherein the adding amount of the sodium hydroxide and the sodium persulfate is 1:1, and the adding amount of the sodium persulfate is 1 percent of the mass percent of the soil.
(3) And (3) fully stirring the sample in the step (2), then placing at normal temperature, maintaining for 7d, and then sampling for inspection and analysis.
Example 10:
(1) collecting soil samples, air-drying, grinding, mixing,
(2) firstly adding alkali, then immediately adding sodium persulfate, then adding water to make slurry, and uniformly stirring. Wherein the adding amount of the sodium hydroxide and the sodium persulfate is 1:1, and the adding amount of the sodium persulfate is 2 percent of the mass percent of the soil.
(3) And (3) fully stirring the sample in the step (2), then placing at normal temperature, maintaining for 8d, and then sampling for inspection and analysis.
Example 11:
(1) collecting soil samples, air-drying, grinding, mixing,
(2) firstly adding alkali, then immediately adding sodium persulfate, then adding water to make slurry, and uniformly stirring. Wherein the adding amount of the sodium hydroxide and the sodium persulfate is 1:1, and the adding amount of the sodium persulfate is 3 percent of the mass percent of the soil.
(3) And (3) fully stirring the sample in the step (2), then placing at normal temperature, maintaining for 9 days, and then sampling for inspection and analysis.
Example 12:
(1) collecting soil samples, air-drying, grinding, mixing,
(2) firstly adding alkali, then immediately adding sodium persulfate, then adding water to make slurry, and uniformly stirring. Wherein the adding amount of the sodium hydroxide and the sodium persulfate is 1:1, and the adding amount of the sodium persulfate is 4 percent of the mass percent of the soil.
(3) And (3) fully stirring the sample in the step (2), then placing the sample at normal temperature, maintaining for 10 days, and then sampling for inspection and analysis.
Example 13:
(1) collecting soil samples, air-drying, grinding, mixing,
(2) firstly adding alkali, then immediately adding sodium persulfate, then adding 50 ℃ water to make slurry, and uniformly stirring. Wherein the adding amount of the sodium hydroxide and the sodium persulfate is 1:1, and the adding amount of the sodium persulfate is 1 percent of the mass percent of the soil.
(3) And (3) fully stirring the sample in the step (2), then placing at normal temperature, maintaining for 7d, and then sampling for inspection and analysis.
Example 14:
(1) collecting soil samples, air-drying, grinding, mixing,
(2) firstly adding alkali, then immediately adding sodium persulfate, then adding water of 55 ℃ to make slurry, and uniformly stirring. Wherein the adding amount of the sodium hydroxide and the sodium persulfate is 1:1, and the adding amount of the sodium persulfate is 2 percent of the mass percent of the soil.
(3) And (3) fully stirring the sample in the step (2), then placing at normal temperature, maintaining for 8d, and then sampling for inspection and analysis.
Example 15:
(1) collecting soil samples, air-drying, grinding, mixing,
(2) firstly adding alkali, then immediately adding sodium persulfate, then adding water of 60 ℃ to make slurry, and uniformly stirring. Wherein the adding amount of the sodium hydroxide and the sodium persulfate is 1:1, and the adding amount of the sodium persulfate is 3 percent of the mass percent of the soil.
(3) And (3) fully stirring the sample in the step (2), then placing at normal temperature, maintaining for 9 days, and then sampling for inspection and analysis.
Example 16:
(1) collecting soil samples, air-drying, grinding, mixing,
(2) firstly adding alkali, then immediately adding sodium persulfate, then adding 70 ℃ water to make slurry, and uniformly stirring. Wherein the adding amount of the sodium hydroxide and the sodium persulfate is 1:1, and the adding amount of the sodium persulfate is 4 percent of the mass percent of the soil.
(3) And (3) fully stirring the sample in the step (2), then placing the sample at normal temperature, maintaining for 10 days, and then sampling for inspection and analysis.
The results are shown in the following table:
according to the embodiment of the invention, the chemical oxidation method can treat the total petroleum polluted soil, various different dosing modes have certain influence on the treatment effect of the chemical oxidation method, the dosing mode of firstly adding the alkali and the sodium persulfate and then adding water for pulping has the best treatment effect, and the best dosing ratio is that the sodium persulfate and the caustic soda are added at a ratio of 4% in a ratio of 1: 1.
The invention is related to petroleum hydrocarbon (C)10-C40) The method for treating the polluted soil is finally carried out until the concentration of the petroleum hydrocarbon in the soil is lower than a second land soil screening value standard (4500mg/kg) specified in soil environmental quality construction land soil pollution risk control standard (trial) (GB36600-2018), and an optimal treatment method and an optimal medicament ratio are selected in the process, so that technical references are provided for actual engineering treatment of the petroleum hydrocarbon polluted soil.
Claims (10)
1. A method for restoring petroleum hydrocarbon polluted soil is characterized by comprising the following steps: air drying, grinding and uniformly mixing the polluted soil; adding a medicament into the polluted soil; and maintaining for a certain time and then sending for inspection and analysis.
2. The method for remediating petroleum hydrocarbon-contaminated soil as set forth in claim 1, wherein: the medicament is sodium hydroxide and sodium persulfate.
3. The method for remediating petroleum hydrocarbon-contaminated soil as set forth in claim 1, wherein: sodium hydroxide is added into the polluted soil, and then sodium persulfate is immediately added.
4. The method for remediating petroleum hydrocarbon-contaminated soil as set forth in claim 1, wherein: adding sodium hydroxide into the polluted soil, uniformly mixing, reacting for 20-60 h, and then adding sodium persulfate.
5. The method for remediating petroleum hydrocarbon-contaminated soil as set forth in claim 1, wherein: after sodium hydroxide and sodium persulfate are sequentially added into the polluted soil, water is added for pulping.
6. The method for remediating petroleum hydrocarbon-contaminated soil as set forth in claim 1, wherein: after sodium hydroxide and sodium persulfate are sequentially added into the polluted soil, a proper amount of hot water at the temperature of 50-70 ℃ is added for pulping.
7. The method for remediating petroleum hydrocarbon-contaminated soil as set forth in claim 1, wherein: and maintaining for a certain time, namely, fully stirring the contaminated soil after adding the medicine, then placing the contaminated soil at normal temperature, and maintaining for 7-10 days.
8. The method for remediating petroleum hydrocarbon-contaminated soil as set forth in any one of claims 3 to 6, wherein: the addition amount of sodium hydroxide and sodium persulfate was 1: 1.
9. The method for remediating petroleum hydrocarbon-contaminated soil as set forth in claim 8, wherein: the adding amount of the sodium persulfate is 1-4% of the mass percent of the polluted soil.
10. The method for remediating petroleum hydrocarbon-contaminated soil as set forth in claim 9, wherein: the adding amount of the sodium persulfate is 4 percent of the mass percent of the soil.
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Application publication date: 20201103 |