CN105964666B - Soil remediation method - Google Patents
Soil remediation method Download PDFInfo
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- CN105964666B CN105964666B CN201610348931.XA CN201610348931A CN105964666B CN 105964666 B CN105964666 B CN 105964666B CN 201610348931 A CN201610348931 A CN 201610348931A CN 105964666 B CN105964666 B CN 105964666B
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- vertical injection
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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
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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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- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The invention provides a soil remediation method, which comprises the following steps of injecting water vapor into a polluted area; pushing the magnetic adsorption material to the polluted area through a vertically injected air passage and an air passage of a horizontally extending well in a mode that air flow carries the magnetic adsorption material; the number of the vertical injection wells is several, the horizontal extension well is arranged on at least one vertical injection well, and the vertical injection wells are communicated with the ground and a pollution area. Adopt fluid transport's mode, can make magnetic adsorption material transport to the contaminated area inside fast to combine together with magnetic metal, adopt fluid transport simultaneously, can operate great contaminated area, thereby avoided among the prior art, with magnetic adsorption material and the soil that contains the heavy metal stir each other the technical defect that the inefficiency brought, homogeneity are poor and be not suitable for extensive getting rid of, thereby improved magnetic adsorption material's adsorption efficiency.
Description
Technical Field
The invention relates to the technical field of soil remediation, in particular to a method for removing heavy metals in soil.
Background
heavy metal is a typical pollutant type of soil environment, typically represents cadmium, mercury, lead, arsenic and the like, generally has the characteristics of wide distribution, strong concealment and serious harm, and diseases such as water illness, nervous system injury and the like caused by heavy metal pollution seriously harm the health of people. Therefore, the treatment and removal of heavy metals in soil are a major concern in the field of environment in recent years.
The current common heavy metal contaminated soil remediation technologies mainly comprise a phytoremediation technology and an electrochemical technology. The heavy metal removal efficiency of the plant restoration technology for one year is generally only about 10% -15%, and the restoration efficiency is low. In the electrochemical repair technology, an electrochemical method is adopted to carry out cathode extraction on metal ions in soil, but the method has higher requirements on equipment, and is not beneficial to removing the metal ions in a large area because the chemical property of heavy metal is relatively stable and the electrochemical reaction speed is slower.
Patent document CN102319725A discloses a magnetic separation method for removing heavy metals from soil, which comprises the steps of firstly uniformly adding a magnetic adsorption material into soil with a water content adjusted, then periodically stirring the soil and the magnetic adsorption material to enable the magnetic adsorption material to fully adsorb the heavy metals in the soil, and then sucking out the magnetic adsorption material in a magnetic separation manner, thereby completing the removal of the heavy metals. The method needs to stir frequently in the treatment process, adds water to maintain the soil humidity, is more suitable for operating after digging out the soil with small area, and for large-scale soil pollution, because the pollutant is positioned below the soil and the soil pollution area is large, the pollutant, the adsorption material and the water are difficult to mix together, the uniformity of repair cannot be ensured, and the repair efficiency is low.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the technical defects of low efficiency, poor uniformity and unsuitability for large-scale removal of the heavy metal pollutants in the soil in the prior art.
Accordingly, the present invention provides a method of soil remediation comprising the steps of injecting water vapour into a contaminated area; pushing the magnetic adsorption material to the polluted area through a vertically injected air passage and an air passage of a horizontally extending well in a mode that air flow carries the magnetic adsorption material; the number of the vertical injection wells is several, the horizontal extension well is arranged on at least one vertical injection well, and the vertical injection wells are communicated with the ground and a pollution area.
The magnetic adsorption material is a mixture of activated carbon and CuFe 2 O 4.
The ratio of the activated carbon to the CuFe 2 O 4 is 1: 1.2-1.6.
in the step of injecting the water vapor into the polluted area, after the water vapor injection is finished, the water content of the polluted area is between 15 and 18 percent.
After the step of injecting water vapor into the contaminated area, injecting an acidic solution into the contaminated area to maintain the pH of the contaminated area between 3 and 5.
Meanwhile, the present invention provides a soil remediation device, comprising: the system comprises a plurality of vertical injection wells, a plurality of vertical injection wells and a plurality of pollution control devices, wherein the vertical injection wells are communicated with the ground and a pollution area, and air passages are arranged on the vertical injection wells; the horizontal extending wells are communicated with at least one vertical injection well, and the horizontal extending wells are provided with air passages; and the injection equipment extends into the vertical injection well and is used for injecting the magnetic adsorption material.
The injection equipment comprises a main pipe, and a plurality of first air holes are formed in the pipe body of the main pipe; and the horizontal branch pipe is at least one set, the horizontal branch pipe is communicated with the main pipe, and a plurality of second air holes are formed in the horizontal branch pipe.
The horizontal branch pipe is a composite sleeve, the composite sleeve comprises a plurality of round pipes which are connected in a nested mode, and the round pipes which are connected in the nested mode have the same axis and different inner diameters.
In the plurality of circular tubes which are connected in a nested manner, the inner diameter of the circular tube which is closest to the main tube in the horizontal direction is the largest, and the inner diameter of the circular tube which is farthest away from the main tube is the smallest.
The technical scheme of the invention has the following advantages:
1. The soil remediation method provided by the invention comprises the following steps of injecting water vapor into a polluted area; pushing the magnetic adsorption material to the polluted area through a vertically injected air passage and an air passage of a horizontally extending well in a mode that air flow carries the magnetic adsorption material; the number of the vertical injection wells is several, the horizontal extension well is arranged on at least one vertical injection well, and the vertical injection wells are communicated with the ground and a pollution area.
Through injecting water vapor into the contaminated area, the water content of soil can be improved, proper dispersion of soil particles is facilitated, and conditions are created for adsorption of later-stage magnetic adsorption materials. The magnetic adsorption material is pushed to the polluted area by adopting a mode that the magnetic adsorption material is carried by airflow, so that the magnetic adsorption material can be quickly transported to the interior of the polluted area and combined with the magnetic metal; magnetic adsorption material is injected into through the air flue of vertical injection well and the air flue of horizontal extension well, can operate great contaminated area, and the homogeneity is good, has improved magnetic adsorption material's adsorption efficiency.
2. According to the soil remediation method provided by the invention, the adopted magnetic adsorption material is a mixture of activated carbon and CuFe 2 O 4, and the ratio of the activated carbon to the CuFe 2 O 4 is 1: 1.2-1.6.
The CuFe 2 O 4 has magnetism, can adsorb magnetic metals in soil, such as cadmium, arsenic, iron, lead and other elements, and enables the magnetic metals to become magnetic metal clusters, the porosity of the active carbon material is high, and after the formed magnetic metal clusters meet the active carbon under the action of fluid, gaps in the active carbon can contain the magnetic metal clusters, so that the magnetic metals are fixed in the active carbon, and the adsorption effect is improved.
3. According to the soil remediation method provided by the invention, in the step of injecting water vapor into the polluted area, after the steam injection is finished, the water content of the polluted area is 15% -18%.
certain water content is kept in the soil, proper dispersion of soil particles is facilitated, full contact between heavy metal ions and the active carbon adsorption material can be enhanced, and the adsorption area is increased.
4. The soil remediation method provided by the invention further comprises the step of injecting an acidic solution into the polluted area after the step of injecting water vapor into the polluted area, so that the pH value of the polluted area is maintained between 3 and 5.
Most heavy metal ions are more easily dissolved and migrated under the acidic condition, and the aggregation of magnetic metals in soil is facilitated, so that the reaction with CuFe 2 O 4 is easily performed, and the removal of the magnetic metal ions is facilitated.
5. The invention provides a soil remediation device, comprising: the system comprises a plurality of vertical injection wells, a plurality of vertical injection wells and a plurality of pollution control devices, wherein the vertical injection wells are communicated with the ground and a pollution area, and air passages are arranged on the vertical injection wells; the horizontal extending wells are communicated with at least one vertical injection well, and the horizontal extending wells are provided with air passages; and the injection equipment extends into the vertical injection well and is used for injecting and carrying the magnetic adsorption material.
The injection equipment carries magnetic adsorption material, and through vertical injection well and horizontal injection well, can make magnetic adsorption material maximum and the magnetic heavy metal in the air flue combine together.
6. The invention provides a soil remediation device, wherein injection equipment comprises a main pipe, and a plurality of first air holes are formed in the pipe body of the main pipe; and the horizontal branch pipe is at least one set, the horizontal branch pipe is communicated with the main pipe, and a plurality of second air holes are formed in the horizontal branch pipe.
through being responsible for and horizontal branch pipe for magnetic adsorption material's injection scope has included two vertical and horizontal directions, thereby has effectively increased adsorption material's adsorption area, has improved magnetic adsorption material and the combination efficiency of magnetism heavy metal in the soil.
7. According to the soil remediation device provided by the invention, the horizontal branch pipe is a composite sleeve pipe, the composite sleeve pipe comprises a plurality of round pipes which are connected in a nested manner, and the plurality of round pipes which are connected in the nested manner have the same axis and different inner diameters. In the plurality of circular tubes which are connected in a nested manner, the inner diameter of the circular tube which is closest to the main tube in the horizontal direction is the largest, and the inner diameter of the circular tube which is farthest away from the main tube is the smallest.
The branch pipes arranged in a nested manner can better utilize the space inside the circular pipes, when in use, the internal circular pipes with smaller internal diameters are stretched out, the action area of the magnetic adsorption material is increased, and meanwhile, the nested manner is adopted, which is beneficial to the installation and transportation of the branch pipes.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic structural view of the injection apparatus in the provided embodiment of the invention;
Description of reference numerals:
1-main tube; 2-a first air vent; 3-a second air hole; 4-round tube
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular 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 otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
example 1
The embodiment provides a soil remediation method, which comprises the following steps of injecting water vapor into a polluted area; pushing the magnetic adsorption material to the polluted area through a vertically injected air passage and an air passage of a horizontally extending well in a mode that air flow carries the magnetic adsorption material; the number of the vertical injection wells is several, the horizontal extension well is arranged on at least one vertical injection well, and the vertical injection wells are communicated with the ground and a pollution area.
Through injecting water vapor into the contaminated area, the water content of soil can be improved, proper dispersion of soil particles is facilitated, and conditions are created for adsorption of later-stage magnetic adsorption materials. The magnetic adsorption material is pushed to the polluted area by adopting a mode that the magnetic adsorption material is carried by airflow, so that the magnetic adsorption material can be quickly transported to the interior of the polluted area and combined with the magnetic metal; magnetic adsorption material is injected into through the air flue of vertical injection well and the air flue of horizontal extension well, can operate great contaminated area, and the homogeneity is good, has improved magnetic adsorption material's adsorption efficiency.
In a preferred embodiment, the magnetic adsorption material is a mixture of activated carbon and CuFe 2 O 4, and the ratio of the activated carbon to the CuFe 2 O 4 is 1: 1.2-1.6.
2 4The porosity of the activated carbon material is high, and after the formed magnetic metal clusters meet the activated carbon under the action of fluid, gaps in the activated carbon contain the magnetic metal clusters, so that the magnetic metal is fixed in the activated carbon, and the adsorption effect is improved.
alternatively, the CuFe 2 O 4 can be made of other magnetic materials, such as MnFe 2 O 4 and the like, which are also magnetic and can adsorb magnetic heavy metals in soil.
in a preferred embodiment, in the step of injecting steam into the contaminated area, after the steam injection is completed, the water content of the contaminated area is between 15% and 18%, for example, 15%, 16%, 18%, and the like.
Certain water content is kept in the soil, proper dispersion of soil particles is facilitated, full contact between heavy metal ions and the active carbon adsorption material can be enhanced, and the adsorption area is increased.
Specifically, in the step of injecting steam into the contaminated area, the steam enters the ground from the outside through the vertical injection well and is diffused to the horizontal area of the contaminated area through the horizontally extending well.
As a preferred embodiment, after the step of injecting water vapor into the contaminated area, the method further comprises injecting an acidic solution into the contaminated area to maintain the pH of the contaminated area between 3 and 5.
Most heavy metal ions are more easily dissolved and migrated under the acidic condition, and the aggregation of magnetic metals in soil is facilitated, so that the reaction with CuFe 2 O 4 is easily performed, and the removal of the magnetic metal ions is facilitated.
In particular, the acidic solution may be injected into the contaminated area simultaneously with the water vapor. The acidic solution that adopts can be for taking place easily the hydrochloric acid solution of gasification, or the volatile organic acid of solution, and organic acid has volatility usually, after accomplishing the absorption to magnetic heavy metal in the soil, can heat the contaminated area for organic acid is heated and is volatilized from the soil.
Example 2
the present embodiment provides a soil remediation device comprising: the system comprises a plurality of vertical injection wells, a plurality of vertical injection wells and a plurality of pollution control devices, wherein the vertical injection wells are communicated with the ground and a pollution area, and air passages are arranged on the vertical injection wells; the horizontal extending wells are communicated with at least one vertical injection well, and the horizontal extending wells are provided with air passages; and the injection equipment extends into the vertical injection well and is used for injecting and carrying the magnetic adsorption material.
The injection equipment carries the magnetic adsorption material, and through vertical injection well and horizontal injection well, can make the magnetic adsorption material combine together with the magnetism heavy metal in the air flue to the greatest extent in vertical injection well and horizontal injection well.
As a preferred embodiment, as shown in fig. 1, the injection device includes a main pipe 1, and a plurality of first air holes 2 are arranged on a pipe body of the main pipe 1; and at least one set of horizontal branch pipe is arranged, the horizontal branch pipe is communicated with the main pipe 1, and a plurality of second air holes 3 are formed in the horizontal branch pipe.
Specifically, the branch pipe provided with the second air holes 3 is communicated with the main pipe 1 and horizontally arranged, and when the pipeline is used for injecting the magnetic adsorption material, the whole injection area can be effectively increased, so that the extraction efficiency and the extraction capacity of the gas are improved.
In the specific injection process, the magnetic adsorption material firstly enters the ground from the ground through the main pipe 1, and then flows out of the first air holes 2 and enters the vertical air channel. The horizontal branch pipe is connected to the main pipe 1, the magnetic adsorption material flows out of the first air holes 2 and enters the horizontal branch pipe, and flows out of the second air holes 3 formed in the horizontal branch pipe and enters the horizontal air passages, so that the magnetic adsorption material is distributed in the whole pollution area.
as a variant, the horizontal branch pipes may be arranged at an angle to the main pipe 1, and the angle between the two may be between 0 and 90 degrees.
In a preferred embodiment, the horizontal branch pipe is a composite casing pipe, the composite casing pipe comprises a plurality of nested circular pipes 4, and the nested circular pipes 4 have the same axis and different inner diameters.
In the plurality of nested circular tubes 4, the inner diameter of the circular tube 4 closest to the main tube 1 in the horizontal direction is the largest, and the inner diameter of the circular tube 4 farthest from the main tube 1 is the smallest.
The branch pipes arranged in a nesting mode can better utilize the space inside the circular pipe 4, when in use, the inner circular pipe 4 with smaller inner diameter is stretched out, the action area of the magnetic adsorption material is increased, and meanwhile, the nesting mode is adopted, so that the installation and the transportation of the branch pipes are facilitated
In a preferred embodiment, the inner diameter of the circular tube 4 closest to the main tube 1 in the horizontal direction among the plurality of nested circular tubes 4 is the largest, and the inner diameter of the circular tube 4 farthest from the main tube 1 is the smallest.
Particularly, through the arrangement mode, a pressure gradient is conveniently formed in the extension direction of the branch pipe during extraction, the inner diameter of the round pipe 4 at the farthest position is the smallest, the negative pressure is strong, and extraction is convenient; and, form the pressure gradient from far away to near, be convenient for gaseous phase pollutant to the direction motion of being responsible for 1, can guarantee the extraction effect of the pipe 4 of furthest, improve extraction ability and extraction efficiency.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (8)
1. A soil remediation method is characterized by comprising the following steps,
Injecting water vapor into the polluted region;
Pushing the magnetic adsorption material to the polluted area through an air passage of a vertical injection well and an air passage of a horizontal extension well in a mode that an air flow carries the magnetic adsorption material;
the number of the vertical injection wells is several, the horizontal extension well is arranged on at least one vertical injection well, and the vertical injection wells are communicated with the ground and a polluted area;
Injection equipment extending into the vertical injection well for injecting a magnetic adsorbent material; the injection device comprises
The device comprises a main pipe (1), wherein a plurality of first air holes (2) are formed in the main pipe body; and
The horizontal branch pipe is at least one set, the horizontal branch pipe is connected to the main pipe (1) and is communicated with the main pipe, a plurality of second air holes (3) are formed in the side wall of the horizontal branch pipe, the magnetic adsorption material flows out of the first air holes (2) and enters the horizontal branch pipe, and the magnetic adsorption material flows out of the second air holes (3) formed in the horizontal branch pipe and enters the horizontal air passage.
2. The soil remediation method of claim 1 wherein said magnetically attractable material employed is a mixture of activated carbon and CuFe 2 O 4.
3. The soil remediation method of claim 2 wherein the ratio of said activated carbon to said CuFe 2 O 4 is between 1: 1.2 and 1.6.
4. The soil remediation method of any one of claims 1 to 3 wherein in the step of injecting steam into the contaminated area, the water content of the contaminated area is between 15% and 18% after the steam injection is complete.
5. The soil remediation method of claim 4 further comprising, after the step of injecting water vapor into the contaminated area, the step of injecting water vapor into the contaminated area
Injecting an acidic solution into the contaminated area to maintain the pH of the contaminated area between 3 and 5.
6. A soil remediation device, comprising:
The system comprises a plurality of vertical injection wells, a plurality of vertical injection wells and a plurality of pollution control devices, wherein the vertical injection wells are communicated with the ground and a pollution area, and air passages are arranged on the vertical injection wells;
The horizontal extending wells are communicated with at least one vertical injection well, and the horizontal extending wells are provided with air passages;
Injection equipment extending into the vertical injection well for injecting a magnetic adsorbent material; the injection device comprises
The air conditioner comprises a main pipe (1), wherein a plurality of first air holes (2) are formed in the pipe body of the main pipe; and
And at least one set of horizontal branch pipe is arranged, the horizontal branch pipe is communicated with the main pipe, and a plurality of second air holes (3) are formed in the side wall of the horizontal branch pipe.
7. soil remediation device according to claim 6, wherein the horizontal leg is a composite casing comprising a plurality of nested connected tubulars (4), the plurality of nested connected tubulars (4) having the same axis and different internal diameters.
8. The soil remediation device of claim 7 wherein the inner diameter of the horizontally closest tube to the main tube of the plurality of nestingly connected tubes is the largest and the inner diameter of the tube furthest from the main tube is the smallest.
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| CN201610348931.XA CN105964666B (en) | 2016-05-24 | 2016-05-24 | Soil remediation method |
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| CN201610348931.XA CN105964666B (en) | 2016-05-24 | 2016-05-24 | Soil remediation method |
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| CN105964666B true CN105964666B (en) | 2019-12-10 |
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| CN113634590A (en) * | 2021-08-13 | 2021-11-12 | 明达海洋工程有限公司 | Geological soil restoration treatment system |
| CN114431053A (en) * | 2022-01-13 | 2022-05-06 | 重庆市奉节县多品农业发展有限公司 | Green high-yield soil remediation method for navel oranges in old orchard |
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| CN102319725A (en) * | 2011-05-26 | 2012-01-18 | 中国矿业大学(北京) | Method for removing heavy metal in soil |
| CN102580993A (en) * | 2012-02-21 | 2012-07-18 | 天津生态城环保有限公司 | In-situ remediation technology for organic polluted soil |
| CN103100558A (en) * | 2012-12-12 | 2013-05-15 | 华北电力大学 | Biologically auxiliary pneumatic burst and three-phase vacuum suction soil repair device and method |
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| CN105154374A (en) * | 2015-10-14 | 2015-12-16 | 武汉瑞泽园生物环保科技有限公司 | Heavy metal passivation microbial inoculum and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH04225887A (en) * | 1990-12-27 | 1992-08-14 | Miyama Kk | Method for decontamination contaminated area |
| JP3245071B2 (en) * | 1996-08-30 | 2002-01-07 | 同和鉱業株式会社 | How to clean the soil |
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| CN102319725A (en) * | 2011-05-26 | 2012-01-18 | 中国矿业大学(北京) | Method for removing heavy metal in soil |
| CN102580993A (en) * | 2012-02-21 | 2012-07-18 | 天津生态城环保有限公司 | In-situ remediation technology for organic polluted soil |
| CN203369177U (en) * | 2012-06-19 | 2014-01-01 | 刘碰 | Stainless steel telescoping pipeline |
| CN103100558A (en) * | 2012-12-12 | 2013-05-15 | 华北电力大学 | Biologically auxiliary pneumatic burst and three-phase vacuum suction soil repair device and method |
| CN204602792U (en) * | 2015-03-27 | 2015-09-02 | 深圳市朗坤环保有限公司 | For the drip washing prosthetic device that agriculture heavy-metal contaminated soil is repaired |
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