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Device and method for repairing soil and preventing pollutant diffusion

A technology for soil remediation and pollutants, which is applied in the field of soil remediation and prevents the spread of pollutants. It can solve the problems of high engineering cost, change of soil physical and chemical properties, and long cycle, so as to improve removal efficiency, prevent pollution from spreading, and have a simple structure. Effect

Active Publication Date: 2020-02-11
NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When organic pollutants enter the soil, they will change the physical and chemical properties of the soil, causing great harm to the crops and plants planted on the soil, and indirectly posing a serious threat to human health.
In the prior art, the remediation of organic polluted soil uses ex-situ method or in-situ method for thermal desorption. The advantage of ex-situ method is that the pollutants are thoroughly purified and the problem of pollutant diffusion is not easy to occur, but the engineering cost is huge, and it is only suitable for It is used in a small area, and the thermal desorption method of the in-situ method often escapes and diffuses due to the high temperature causing the organic matter to be desorbed too late, which is equivalent to driving the organic pollution to another soil area, resulting in the inability to effectively remove the pollutants
[0004] In addition, there are chemical reagent oxidation methods for in-situ treatment. The contact rate between chemical reagents and pollutants is low, the reaction is slow, and it takes a long period. In addition, the reaction is not thorough and timely, which will also lead to unsatisfactory removal of pollutants.
Simple physical extraction often has a "tailing" phenomenon, resulting in ineffective removal of pollutants
Biological method is a relatively mild removal method. Although it has certain effects, it takes a long period of time to achieve satisfactory results.

Method used

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  • Device and method for repairing soil and preventing pollutant diffusion
  • Device and method for repairing soil and preventing pollutant diffusion
  • Device and method for repairing soil and preventing pollutant diffusion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Such as Figure 9 As shown, a device for soil remediation and preventing the diffusion of pollutants, the device includes an in-situ injection pressure component 1, an electrode dialysis component 2 and a post-treatment component 3;

[0036] The in-situ injection pressure assembly 1 includes an injection pressure pipe 11 drilled in the contaminated soil area, and an atomizer 12 for generating hydrogen peroxide dry mist. The atomizer 12 can be Metso brand, the model is DF- MX atomized hydrogen peroxide sterilizer, the average spray particle size is 7.5μm, and the spray volume is 2.4L / h. And the plasma generator 13 used to generate plasma air, the plasma generator 13 is a low-temperature plasma air device capable of generating no higher than 60°C, the atomizer 12 and the plasma generator 13 are respectively arranged on the top of each injection pressure pipe 11 The inlet one 111 and the inlet two 112 are connected, and the inlet one 111 and the inlet two 112 are respecti...

Embodiment 2

[0045] As an optimization scheme, this embodiment is basically the same as Embodiment 1, the difference is that, as Figure 4 As shown, the inside of the injection pressure tube 11 is provided with a piston inner cylinder 117 that is convenient for the movement of the piston rod 114. The upper end of the piston inner cylinder 117 is fixedly connected with the inner top of the injection pressure tube 11, and the lower end of the piston inner cylinder 117 is far from the bottom of the injection pressure tube 11. 20cm, used to communicate with the piston inner cylinder 117 and the injection tube 11 to form an injection mixing chamber 118, and the bottom of the injection tube 11 is also provided with a conical head 119 for easy drilling.

Embodiment 3

[0047] As an optimization scheme, this embodiment is basically the same as Embodiment 2, the difference is that, as figure 1 , 2 , 3, the inner wall of the injection pressure pipe 11 is provided with a plurality of baffles 116 with their ends facing down and forming an angle of 45 degrees with the inner wall of the injection pressure pipe 11. above, when the air intake as figure 2 As shown, when the intake air is from top to bottom, it is the exhaust hole 115 to block the flow, and when the air is discharged, it is as follows: image 3 As shown, the exhaust hole 115 guides the flow when exhausting from bottom to top. It can facilitate the uniform diffusion of mixed oxides and improve their utilization.

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Abstract

The invention discloses a device and method for repairing soil and preventing pollutant diffusion. The device comprises an in-situ pressurization component, an electrode dialysis component and an aftertreatment component. Firstly, injecting a mixed oxidant of hydrogen peroxide dry mist and low-temperature plasma air into polluted soil in an injection pressure mode, then organic pollutants in the soil can be rapidly oxidized and decomposed, and pollutant diffusion can be also effectively prevented by a low-temperature mode. The device is also provided with an electrode zone, the pollutants canbe in directed migration along with ions by using an electrolysis method, a dialysis layer is also arranged on the inner side of an electrode net, and sucked and accumulated pollutants can be baffledby using three-dimensional filtering cotton and can be further oxidized and decomposed through persulfate, so that the removal efficiency of the pollutants in the soil can be greatly improved. In a word, the device has the advantages that the structure is simple, the in-situ pollutant treatment velocity is rapid, and pollutant diffusion is not easily caused.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to a device and method for soil remediation and preventing the diffusion of pollutants Background technique [0002] Soil is an important part of the ecological environment on which human beings depend. However, with the rapid development of urbanization and industrialization, organic pollutants will migrate into the soil environment during production and use, which not only destroys the ecosystem of the soil itself, It even poses a threat to groundwater resources, so soil protection and remediation of contaminated soil are increasingly concerned and valued at home and abroad. [0003] When organic pollutants enter the soil, they will change the physical and chemical properties of the soil, causing great harm to the crops and plants planted on the soil, and indirectly posing a serious threat to human health. In the prior art, the remediation of organic polluted...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
CPCB09C1/085B09C2101/00
Inventor 徐建王菲杨敏王磊李亮李群周艳粟丰
Owner NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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