CN107282622B - Device and method for repairing soil VOCs pollution - Google Patents
Device and method for repairing soil VOCs pollution Download PDFInfo
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- CN107282622B CN107282622B CN201710708005.3A CN201710708005A CN107282622B CN 107282622 B CN107282622 B CN 107282622B CN 201710708005 A CN201710708005 A CN 201710708005A CN 107282622 B CN107282622 B CN 107282622B
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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
- B09C1/065—Reclamation of contaminated soil thermally by pyrolysis
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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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- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
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- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to the technical field of environmental protection, in particular to a device and a method for repairing the pollution of VOCs in soil, wherein the device comprises a steam injection well and a liquid medicine injection well, and the steam injection well and the liquid medicine injection well penetrate through a polluted soil area to reach uncontaminated soil; the steam injection well is connected with a steam boiler through a high-pressure air pump; the steam injection well consists of a steam conveying pipeline and a steam injection head, and a steam injection air hole is formed in the steam injection head; the liquid medicine injection well is connected with the medicine adding box through the medicine adding valve and the medicine adding pump. The process has the advantages of simple equipment, only need of punching and drilling holes, in-situ repair, small engineering quantity and good repair effect.
Description
Technical Field
The invention relates to the technical field of environmental protection, in particular to a device and a method for repairing soil VOCs pollution.
Background
Various industrial activities, including chemical production, mechanical manufacturing, metal smelting, etc., cause a large amount of contaminants to be dispersed into various environmental media. Among them, pollution of human activities to soil is the most difficult problem to solve due to its concealment and long-term nature. The western countries begin to engage in repair work on contaminated sites from the 70 s and large amounts of funds are put into large and small repair projects. In the united states, annual invested repair funds are between $100 billion and $200 billion; as such, an estimate of the united states environmental protection agency 2004 indicates that there are still nearly 30 tens of thousands of contaminated sites in the united states that require remediation, with capital costs in excess of several billion dollars.
With the rapid development of the economy in China, the number of automobiles is rapidly increased, and the number of gas stations and underground oil storage tanks is increased. According to the existing monitoring results, the pollution degree of China is far greater than that of western countries. There are estimates that hundreds of thousands of billions of repair funds are needed to completely repair the various sites that are currently contaminated. Because of the leakage of oil pipelines and oil storage tanks, the emission of oily sewage, floor oil, pesticides and the like, a large amount of oil pollutants enter the soil, and the pollution of petroleum and chemical industry to the soil, especially a large amount of volatile organic matters in the soil, damages the ecological system of the soil, threatens the underground water and seriously endangers human health. Volatile organic compounds as a special type of soil pollutant have different pollution characteristics from other pollutants and are classified as potentially dangerous and preferential controlled pollutants in the environment due to the complexity and hazard of the components. Therefore, how to reasonably and effectively treat and repair volatile organic contaminated soil has become a problem to be solved.
At present, the domestic volatile organic compound pollution sites have wide areas, different pollution levels and complex pollutant components, and severely limit the urban development and capacity expansion. Aiming at the soil polluted by industrial volatile organic compounds (Volatile Organic Compounds, VOCs), the existing repair technology mainly comprises vapor extraction, thermal desorption, cement pit burning, landfill and the like. However, the vapor extraction technology has long operation time and cannot meet the requirement of industrial pollution sites in cities for development; the thermal desorption cost is high, and the method can not be used for treating large batches of polluted soil; the incineration and landfill technology has the advantages of high secondary pollution risk, high cost and limited treatment capacity. Therefore, it is difficult for the conventional soil remediation technology to meet the increasingly changing market demands.
In view of this, the present invention has been made.
Disclosure of Invention
The invention aims to provide a device for repairing soil VOCs pollution and a method for repairing soil based on the device.
In order to achieve the above object of the present invention, the following technical solutions are specifically adopted:
the invention relates to a device for repairing soil VOCs pollution, which comprises a steam injection well and a liquid medicine injection well, wherein the steam injection well and the liquid medicine injection well penetrate through a polluted soil area to reach uncontaminated soil;
the steam injection well is connected with a steam boiler through a high-pressure air pump; the steam injection well consists of a steam conveying pipeline and a steam injection head, and a steam injection air hole is formed in the steam injection head;
the liquid medicine injection well is connected with the medicine adding box through the medicine adding valve and the medicine adding pump.
The method aims at restoring the soil polluted by VOCs organic matters, uses an oxidant to be injected into a soil layer through a liquid medicine direct-pushing injection well, and then achieves the aim of oxidation purification through an in-situ thermal desorption technology process.
Preferably, the device for repairing the pollution of the VOCs in the soil is described above, and the dosing tank is filled with an oxidizing agent.
Preferably, the device for repairing the pollution of the VOCs in the soil is described above, and the oxidizing agent is hydrogen peroxide solution.
Preferably, the device for repairing soil VOCs pollution is characterized in that the number of the steam injection wells and the liquid medicine injection wells is one or more;
when the number of the steam injection wells and the liquid medicine injection wells is plural, the steam injection wells and the liquid medicine injection wells are alternately arranged.
Preferably, the distance between the adjacent steam injection well and the liquid medicine injection well is 500 mm-15000 mm in the device for repairing the pollution of the soil VOCs.
Preferably, the caliber of the steam injection well and the caliber of the liquid medicine injection well are 100-200 mm.
Preferably, the device for repairing the pollution of the VOCs in the soil is characterized in that the penetration depth of the steam injection well and the liquid medicine injection well is 5-10 m.
Preferably, the device for repairing soil VOCs pollution as described above, wherein the steam injection air holes are arranged in a ring shape and distributed on the outer wall of the steam injection head;
more preferably, the diameter of the steam jet air hole is 0.5 mm-1.5 mm;
more preferably, when the steam jet air holes are arranged in a ring shape, the air hole spacing of each jet head is 2.5 mm-3.5 mm;
more preferably, when the steam injection air holes are arranged in a ring shape, each ring has only one row of steam injection air holes; the number of the rings is 1-8; more preferably, every two adjacent rings along the radial direction of the steam jet head are parallel, and the distance is 45-55 mm.
The invention also relates to a method for repairing soil VOCs pollution based on the device, which comprises the following steps:
the method comprises the steps that a steam injection well and a liquid medicine injection well are arranged in a polluted soil area to be treated, after oxidant is injected into the polluted soil by the liquid medicine injection well, the steam injection well is used for heating the steam injected into the polluted soil, so that the pollutants are converted into gas and mixed with the oxidant to undergo oxidation reaction, and oxidation products volatilize to the air in the form of steam or are combined into the soil.
Preferably, the vapor permeation rate is from 4cm/s to 10cm/s by the method described above.
Compared with the prior art, the invention has the beneficial effects that:
1) The preparation of the technology is an instantaneous oxidation preparation, can oxidize and remove volatile organic compounds in a very short time, and cannot cause secondary pollution due to volatilization and dispersion of the organic compounds on the ground surface;
2) The technology is applicable to the restoration of the soil polluted by the volatile organic compounds with high concentration, the soil type is mainly high-permeability, and the technology has the advantages of simple equipment, no need of completely shifting the soil, only need of punching and hole drilling, in-situ restoration, small engineering quantity, good effect and the like;
3) Compared with other processes, the process has the advantages of low manufacturing cost, easy operation and thorough oxidation, and can solve pollution sources at one time without the problem of rebound of volatile organic compounds after treatment.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic top view of an apparatus for remediation of soil VOCs contamination provided by the present invention;
fig. 2 is a schematic diagram of a steam delivery pipe and a steam injection head of a steam injection well according to the present invention.
Reference numerals:
a steam injection well-1;
a steam delivery line-101; a steam jet head-102;
liquid medicine injection well-2.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and detailed description, but it will be understood by those skilled in the art that the examples described below are some, but not all, examples of the present invention, and are intended to be illustrative of the present invention only and should not be construed as limiting the scope of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 1 and 2, the present invention relates to a device for repairing the pollution of soil VOCs, comprising a steam injection well-1 and a liquid medicine injection well-2, wherein the steam injection well-1 and the liquid medicine injection well-2 penetrate through a polluted soil area to reach uncontaminated soil;
the steam injection well-1 is connected with a steam boiler through a high-pressure air pump; the steam injection well-1 consists of a steam conveying pipeline-101 and a steam injection head-102, wherein a steam injection air hole is formed in the steam injection head;
the liquid medicine injection well-2 is connected with a medicine adding box through a medicine adding valve and a medicine adding pump.
The method aims at restoring the soil polluted by VOCs organic matters, uses an oxidant to be injected into a soil layer through a liquid medicine direct-pushing injection well, and then achieves the aim of oxidation purification through an in-situ thermal desorption technology process.
Preferably, the device for repairing the polluted soil VOCs further comprises an insulating layer, and the insulating layer is arranged on the surface of the polluted soil area.
The heat insulating layer can prevent heat loss, so that heat energy generated by the steam injection well-1 is saved.
Preferably, the device for repairing the pollution of the VOCs in the soil is described above, and the dosing tank is filled with an oxidizing agent.
Preferably, the device for repairing the pollution of the VOCs in the soil is described above, and the oxidizing agent is hydrogen peroxide solution.
One formulation of the hydrogen peroxide oxidizing agent mother liquor is shown in the following table:
| bulk density of | 0.8～1.05g/cm 3 |
| Active oxidant | 17％ |
| Moisture content | 20% (maximum) |
| pH value (3% solution) | About 10.2 |
| Comprises | Stabilizing agent |
The oxidation agent is injected into the soil according to the distribution condition of the injection well, the agent is firstly prepared into a solution with the volume percentage concentration of 5% before use, and the solution is directly injected into the polluted soil in a pushing way.
Preferably, the number of the steam injection well-1 and the liquid medicine injection well-2 is one or more;
when the number of the steam injection wells-1 and the chemical solution injection wells-2 is plural, the steam injection wells-1 and the chemical solution injection wells-2 are alternately arranged.
The efficiency of soil purification can be improved to the greatest extent by the alternate arrangement. As shown in FIG. 1, the steam injection wells-1 and the chemical injection wells-2 may be arranged in a matrix shape, with each steam injection well-1 being adjacent to a chemical injection well-2.
Preferably, the distance between the adjacent steam injection well-1 and the liquid medicine injection well-2 of the device for repairing the pollution of the soil VOCs is 500 mm-15000 mm;
more preferably, the distance between the adjacent steam injection well-1 and the liquid medicine injection well-2 is 2000 mm-13000 mm, or 4000 mm-11000 mm, or 6000 mm-9000 mm, or 7000mm-8000 mm.
The specific distance between the steam injection well-1 and the chemical injection well-2 needs to be determined according to different characteristics (such as permeability, etc.) of the soil and different VOCs contents.
Preferably, the caliber of the steam injection well-1 and the caliber of the liquid medicine injection well-2 are 100 mm-200 mm;
more preferably, the caliber of the steam injection well-1 and the caliber of the liquid medicine injection well-2 are 120 mm-180 mm, or 140 mm-160 mm and 150mm.
Preferably, the device for repairing the VOCs pollution in the soil is characterized in that the penetration depth of the steam injection well-1 and the liquid medicine injection well-2 is 5-10 m; more preferably, the penetration depth is 6m to 9m, or 7m to 8m.
The depth of the soil is required to be determined according to the specific soil pollution depth, and the depth of 5 m-10 m is feasible under the general condition. Because the invention adopts the in-situ thermal desorption technology to heat VOCs, steam moves upwards, and therefore the outlets of the steam injection well-1 and the liquid medicine injection well-2 are ideally positioned at a point just below a pollution area.
Preferably, the device for repairing soil VOCs pollution is as described above, and the steam injection air holes are arranged in an annular shape and distributed on the outer wall of the steam injection head-102;
more preferably, the diameter of the steam spraying air hole is 0.5 mm-1.5 mm, and more preferably 1mm;
more preferably, when the steam injection air holes are arranged in a ring shape, the air hole spacing of each injection head is 2.5 mm-3.5 mm, and more preferably 2mm;
this spacing refers to the arcuate distance of each injector head air hole along the arcuate surface of the steam injector head-102;
more preferably, when the steam injection air holes are arranged in a ring shape, each ring has only one row of steam injection air holes; the number of the rings is 1 to 8, more preferably 2 to 6, or 3 to 4; more preferably, each two adjacent rings are parallel in the radial direction of the steam jet head, and the distance is 45-55 mm, more preferably 47-53 mm, or 50mm.
The invention also relates to a method for repairing soil VOCs pollution based on the device, which comprises the following steps:
the method comprises the steps that a steam injection well and a liquid medicine injection well are arranged in a polluted soil area to be treated, after oxidant is injected into the polluted soil by the liquid medicine injection well, the steam injection well is used for heating the steam injected into the polluted soil, so that the pollutants are converted into gas and mixed with the oxidant to undergo oxidation reaction, and oxidation products volatilize to the air in the form of steam or are combined into the soil.
After the oxidant is injected, the polluted soil is heated by an in-situ thermal desorption technology to promote the volatilization and overflow of organic matters, the aim is to heat the soil in a high-temperature steam injection mode, and the method is suitable for the high-permeability soil. The organic compound in the soil can be volatilized and cracked, after the pollutant is converted into a gaseous state, the fluidity of the pollutant is greatly improved, the volatilized gaseous product is mixed with the oxidant in the injection well and subjected to oxidation reaction, and finally the volatilized gaseous product is volatilized into the air or is combined into the soil in the form of carbon dioxide and water. The process has the advantages that only a small amount of perforating and boring work is needed, more than 95% of pollutants are degraded in situ, the pollutant migration risk is eliminated, and the load of a ground disposal system is minimized. The pollutants which can be used for treatment by the in-situ thermal desorption technology are mainly chlorine-containing organic matters, semi-volatile organic matters, petroleum hydrocarbons, polycyclic aromatic hydrocarbons, polychlorinated biphenyls, pesticides and the like. At present, the thermal desorption technology is widely applied to petrochemical plants, underground oil reservoirs, timber processing plants, pesticide stores and other areas and repair and treatment work of some pollutant sources.
Preferably, the vapor permeation rate is from 4cm/s to 10cm/s by the method described above; more preferably 6cm/s to 8cm/s, or 7cm/s.
The vapor permeation rate affects the diffusion and oxidation efficiencies of VOCs contaminants.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (2)
1. A method for repairing the VOCs pollution of soil is characterized in that a steam injection well and a liquid medicine injection well are arranged in a polluted soil area to be treated, after oxidant is injected by the liquid medicine injection well, the steam injection well is used for heating the injected steam of the polluted soil, the pollutants are converted into gas and mixed with the oxidant to undergo oxidation reaction, and oxidation products volatilize to the air in the form of steam or are combined in the soil;
the vapor permeation rate is 4cm/s to 10cm/s;
the steam injection well and the liquid medicine injection well penetrate through the polluted soil area to reach uncontaminated soil;
the steam injection well is connected with a steam boiler through a high-pressure air pump; the steam injection well consists of a steam conveying pipeline and a steam injection head, and a steam injection air hole is formed in the steam injection head;
the liquid medicine injection well is connected with the medicine adding box through a medicine adding valve and a medicine adding pump; the dosing box is internally filled with an oxidizing agent; the oxidizing agent is hydrogen peroxide solution;
the distance between the adjacent steam injection well and the liquid medicine injection well is 500 mm-15000 mm;
the apertures of the steam injection well and the liquid medicine injection well are 100 mm-200 mm;
the penetration depth of the steam injection well and the liquid medicine injection well is 5-10 m;
the steam jet air holes are arranged in a ring shape and distributed on the outer wall of the steam jet head;
the diameter of the steam jet air hole is 0.5 mm-1.5 mm;
when the steam jet air holes are arranged in a ring shape, the air hole spacing of each jet head is 2.5 mm-3.5 mm;
when the steam jet air holes are arranged in a ring shape, each ring only has one row of steam jet air holes; the number of the rings is 1-8;
every two adjacent rings are parallel along the radial direction of the steam jet head, and the distance is 45-55 mm.
2. The method of remediating soil VOCs contamination of claim 1, wherein the number of steam injection wells and liquid injection wells is one or more;
when the number of the steam injection wells and the liquid medicine injection wells is plural, the steam injection wells and the liquid medicine injection wells are alternately arranged.
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| CN201710708005.3A CN107282622B (en) | 2017-08-17 | 2017-08-17 | Device and method for repairing soil VOCs pollution |
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| CN107282622B true CN107282622B (en) | 2023-06-20 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109108064B (en) * | 2018-08-10 | 2020-02-28 | 山东冽泉环保工程咨询有限公司 | Large-diameter lath drill bit type in-situ repair system |
| CN110193511B (en) * | 2019-05-31 | 2021-07-27 | 西安交通大学 | Fluidized bed desorption tower for repairing VOCs/SVOCs contaminated soil |
| CN110125165B (en) * | 2019-05-31 | 2021-07-27 | 西安交通大学 | Ectopic remediation process for VOCs/SVOCs contaminated soil |
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| CN207086558U (en) * | 2017-08-17 | 2018-03-13 | 科海思（北京）科技有限公司 | A kind of device of rehabilitating soil VOCs pollutions |
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| JP2002254062A (en) * | 2001-02-28 | 2002-09-10 | Shimizu Corp | In site restoration method and equipment for organic- contaminated soil |
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