CN114932141B - Low-temperature heat strengthening process for improving multiphase extraction efficiency of LNAPLs (Low-grade alkaline peroxide solutions) polluted site - Google Patents
Low-temperature heat strengthening process for improving multiphase extraction efficiency of LNAPLs (Low-grade alkaline peroxide solutions) polluted site Download PDFInfo
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- CN114932141B CN114932141B CN202210491426.6A CN202210491426A CN114932141B CN 114932141 B CN114932141 B CN 114932141B CN 202210491426 A CN202210491426 A CN 202210491426A CN 114932141 B CN114932141 B CN 114932141B
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- lnapls
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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
- B09C1/06—Reclamation of contaminated soil thermally
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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
Abstract
The invention discloses a low-temperature heat strengthening process for improving multiphase extraction efficiency of LNAPLs (low-temperature liquid caustic soda) polluted site, and relates to the technical field of soil treatment agents. The invention utilizes the structure dredging agent to treat the LNAPLs polluted site, thereby improving the removal efficiency of petroleum hydrocarbons in the polluted soil. The structural dredging agent adopted by the invention is prepared by taking attapulgite as a main material and sludge incineration fly ash as an auxiliary material. The method has the advantages of low cost, realization of changing waste into valuable, treatment of the petroleum hydrocarbon polluted soil, efficient removal of the petroleum hydrocarbon pollutants, and good engineering application prospect.
Description
Technical Field
The invention relates to the technical field of soil treatment agents, in particular to a structural dredging agent for treating petroleum hydrocarbon polluted soil and a using method thereof.
Background
With the development of industry, the demand of petroleum is greatly increased, and during the processes of exploitation, transportation, storage and processing, petroleum is discharged to farmlands, underground water and oceans due to accidents or improper management, so that the environment is polluted, and the production and life of human beings are directly harmed. The pollution of petroleum to soil mainly comprises the steps of destroying the soil structure, further influencing the soil permeability, damaging the roots of plants, hindering the breathing and absorption of the roots and finally leading the plants to die. Secondly, the polluted soil contains a large amount of petroleum aromatic substances, so that the polluted soil has high toxicity to human and animals, and the petroleum aromatic substances are easily enriched in animals and plants, so that the polluted soil has greater environmental hazard. Therefore, the treatment of petroleum-contaminated soil is indispensable today.
Disclosure of Invention
Based on the above, the invention aims to provide a low-temperature thermal strengthening process for improving multiphase extraction efficiency of LNAPLs (low-pressure liquid absorption liquids) polluted sites.
The structural dredging agent is prepared by taking attapulgite as a main material and sludge incineration fly ash as an auxiliary material.
Preferably, the mass ratio of the attapulgite to the sludge incineration fly ash is 8:1.
further preferably, the preparation method of the structure dredging agent is to mix the attapulgite and the sludge incineration fly ash in proportion, then ball-mill the mixture for 5 hours and pass through a 100-mesh sieve to obtain the structure dredging agent.
The low-temperature heat strengthening process for improving the multiphase extraction efficiency of the LNAPLs polluted site specifically comprises the following steps:
(1) Mixing a petroleum hydrocarbon polluted soil sample with the structure dredging agent according to a mass ratio of 12;
(2) And (2) heating the soil mixture obtained in the step (1) under the pressure of-1.5 KPa, wherein the heating temperature is 45-55 ℃, and the heating time is 0.5h.
Preferably, the sieving treatment in the step (1) is a 50-mesh sieving treatment.
Compared with the prior art, the invention discloses the following technical effects:
the invention provides a method for treating petroleum hydrocarbon polluted soil by using a dredging agent with a special structure, wherein the adopted dredging agent with the structure is prepared by using low-grade attapulgite as a main material and sludge incineration fly ash as an auxiliary material. The structure dredging agent disclosed by the invention is low in cost, realizes the purpose of changing waste into valuable, treats the petroleum hydrocarbon polluted soil, can efficiently remove the petroleum hydrocarbon pollutants, and has a good engineering application prospect.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to specific embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a structural dredging agent for treating petroleum hydrocarbon contaminated soil and a using method thereof.
The present invention will be described in further detail with reference to specific embodiments in order to make the above objects, features and advantages more apparent and understandable.
Example 1
The invention provides a structure dredging agent, which is prepared by mixing attapulgite and sludge incineration fly ash according to the mass ratio of 8:1, ball milling the mixture for 5 hours, and sieving the mixture by a 100-mesh sieve.
The structural dredging agent prepared in example 1 was used to examine the effect of the agent on the treatment of petroleum hydrocarbon-contaminated soil. The specific experimental method is as follows:
1. laboratory testing
(1) Preparation of Petroleum Hydrocarbon contaminated soil
Collecting normal soil, removing impurities from the normal soil, drying, grinding, cleaning the ground soil with deionized water, drying at 105 ℃ for 4h in a vacuum drying oven, and sieving with a 100-mesh sieve to obtain a soil sample;
then, mixing the soil sample and the n-tridecane according to the volume ratio of 1:9, adding a proper amount of acetone, stirring and oscillating to ensure that the n-tridecane is uniformly distributed in the soil sample, and finally placing the soil sample in a fume hood for continuous stirring to volatilize the acetone so as to obtain the petroleum hydrocarbon contaminated soil sample to be treated.
(2) Mixing and sieving
Mixing a petroleum hydrocarbon polluted soil sample with the structural dredging agent according to a mass ratio of 12;
(3) Heat treatment of
Heating the sieved soil mixture at 45 deg.C and 55 deg.C under-1.5 KPa for 0.5 hr.
(4) Soil pollutant residue detection
And (4) putting the soil treated in the step (3) into a centrifugal tube, carrying out ultrasonic extraction by using n-hexane for 5 times, combining extracting solutions after centrifugation, blowing nitrogen to concentrate the extracting solutions to 0.5 ml, and measuring the content of the pollutant to be tested in the extracting solutions by using a gas chromatography. The residual rate of the pollutant soil is calculated by measuring the content of the tested pollutant in the soil before and after the experiment is started, and the residual rates of the n-tridecane polluted soil are respectively 26.2% and 19.5% by measurement.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (3)
1. A low-temperature thermal strengthening process for improving multiphase extraction efficiency of LNAPLs polluted sites is characterized by comprising the following steps:
(1) Mixing a petroleum hydrocarbon polluted soil sample with a structure dredging agent according to a mass ratio of 12;
(2) Heating the soil mixture obtained in the step (1) under the pressure of-1.5 KPa, wherein the heating temperature is 45-55 ℃, and the heating time is 0.5h;
the structure dredging agent is composed of attapulgite and sludge incineration fly ash in a mass ratio of 8:1.
2. The low-temperature thermal strengthening process for improving multiphase extraction efficiency of LNAPLs (Low temperature liquids) polluted sites as claimed in claim 1, wherein the structure diverting agent is prepared by mixing attapulgite and sludge incineration fly ash in proportion, then ball milling the mixture for 5h and sieving the mixture with a 100-mesh sieve.
3. The low-temperature heat strengthening process for improving the multiphase extraction efficiency of the LNAPLs polluted site as claimed in claim 1, wherein the sieving treatment in the step (1) is a 50-mesh sieving treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210491426.6A CN114932141B (en) | 2022-05-07 | 2022-05-07 | Low-temperature heat strengthening process for improving multiphase extraction efficiency of LNAPLs (Low-grade alkaline peroxide solutions) polluted site |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210491426.6A CN114932141B (en) | 2022-05-07 | 2022-05-07 | Low-temperature heat strengthening process for improving multiphase extraction efficiency of LNAPLs (Low-grade alkaline peroxide solutions) polluted site |
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| Publication Number | Publication Date |
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| CN114932141A CN114932141A (en) | 2022-08-23 |
| CN114932141B true CN114932141B (en) | 2023-03-24 |
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| CN202210491426.6A Active CN114932141B (en) | 2022-05-07 | 2022-05-07 | Low-temperature heat strengthening process for improving multiphase extraction efficiency of LNAPLs (Low-grade alkaline peroxide solutions) polluted site |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103495594B (en) * | 2013-09-21 | 2015-05-27 | 北京工业大学 | Method for inhibiting volatilization of organic matters in low-temperature burning process of polluted soil by utilizing diatomite |
| CN107470342A (en) * | 2016-06-08 | 2017-12-15 | 上海康恒环境股份有限公司 | The construction method and constructing device of the volatile contaminated soil heterotopic low temperature thermal desorption of chlorobenzene class |
| CN106118680A (en) * | 2016-06-28 | 2016-11-16 | 安徽金联地矿科技有限公司 | A kind of preparation method of contaminated soil remediation material based on attapulgite |
| CN107674869A (en) * | 2017-11-06 | 2018-02-09 | 中国科学院寒区旱区环境与工程研究所 | A kind of preparation, measure and the experimental method of attapulgite immobilization oil degradation microbial inoculum |
| CN111872093A (en) * | 2020-06-16 | 2020-11-03 | 江苏省环境科学研究院 | Method for restoring petroleum hydrocarbon polluted soil |
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