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Two-dimensional inhomogeneous field experiment device for electrically repairing polluted soil

A non-uniform electric field and soil repair technology, applied in the restoration of contaminated soil, etc., can solve the problems of inability to freely switch positive and negative electrode switching, cumbersome, inability to measure electrodialysis flow and gas generation rate, etc.

Inactive Publication Date: 2013-08-14
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] As mentioned above, although people have developed a variety of electric restoration devices and methods, there are some shortcomings, such as: 1. More use of plate-shaped materials as electrodes
2. The positive and negative electrodes are distributed on both sides of the polluted soil, causing the pollutants to move in a straight line, and it is likely to enter the closed space of the soil and cannot migrate to the electrode end
3. Unable to measure important parameters such as electrodialysis flow and gas generation rate during the experiment
4. Only a uniform and stable uniform electric field can be formed, and the positive and negative electrodes cannot be switched freely or the switching is cumbersome, resulting in high energy consumption and unstable system operation

Method used

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  • Two-dimensional inhomogeneous field experiment device for electrically repairing polluted soil
  • Two-dimensional inhomogeneous field experiment device for electrically repairing polluted soil
  • Two-dimensional inhomogeneous field experiment device for electrically repairing polluted soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0103] Embodiment 1: For the removal test of heavy metal Cd

[0104] refer to image 3 The soil sample preparation method, prepared the test soil sample that Cd content is 300mg / kg, and described soil sample tank size is 14cm (length) * 14cm (width) * 5cm (high), wherein is the square of cross section The center of the cut circle is the central electrode, and a circle of ring-shaped electrodes is regularly arranged on the periphery. These ring-shaped electrodes are evenly arranged with the central electrode as the symmetrical center, and the distance from the edge of the soil sample tank is 1cm.

[0105] The electrode is hollow, and small holes with a diameter of 3 mm are provided on the electrode tube wall. A filter cloth is arranged around the electrode to prevent soil from entering the hollow electrode. Nitrile rubber sealing rings are arranged between the top cover and the tank body and between the bottom cover and the tank body of the soil sample tank to maintain good s...

Embodiment 2

[0113] Embodiment 2: For the removal test of heavy metal Cd

[0114] Example 2 was carried out in the same manner as in Example 1 except for energizing in the following manner.

[0115] Cycle power "A+2B" as follows:

[0116] A: With the central electrode as the cathode and the ring electrode as the anode, the anode and the cathode are energized for 12 hours at the same time;

[0117] B: With the central electrode as the center of the circle, connect and energize the central electrode and the symmetrically distributed ring electrodes on both sides of the same line in a counterclockwise direction. Each connection is energized for 1.5 hours, and every 0.5 hours during the energization period Change electrode polarity once, i.e. change electrode polarity 3 times until a full pass is complete before switching to the next connection.

[0118] After the operation was completed, the average Cd ion content in the soil sample was measured, and it was found that its concentration was ...

Embodiment 3

[0119] Embodiment 3: For the removal test of heavy metal Cd

[0120] Example 3 was carried out in the same manner as in Example 1 except for energizing in the following manner.

[0121] Power cycle "A+4B" as follows:

[0122] A: With the central electrode as the cathode and the ring electrode as the anode, the anode and the cathode are energized for 12 hours at the same time;

[0123] B: With the central electrode as the center of the circle, connect and energize the central electrode and the symmetrically distributed ring electrodes on both sides in a counterclockwise direction. Each connection is energized for 1 hour, and every 0.5 hours during the energization period Change electrode polarity once, that is, change electrode polarity 2 times before switching to the next connection, until a full pass is completed.

[0124] After the operation was completed, the average Cd ion content in the soil sample was measured, and it was found that its concentration was reduced from 3...

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Abstract

The invention provides a two-dimensional inhomogeneous field experiment device for electrically repairing polluted soil. The two-dimensional inhomogeneous field experiment device comprises a soil sample trough, a gas measuring device, a liquid circulating and measuring device, an electrode control system and a data acquisition system, wherein the soil sample trough comprises a trough body, a top cover, a bottom cover and bolts; center nuts and a plurality of other nuts which are arranged around the center nuts and are in center symmetric and annular are arranged on the top cover and the bottom cover, electrodes are arranged between the upper nuts and the lower nuts, a plurality of probes are uniformly distributed on the top cover, a graded tube is used as the gas measuring device, the liquid circulating and measuring device comprises a connecting pipe, a total distributing pipe, a peristaltic pump and a liquid measuring device, the electrode control system is connected with the electrodes, and the data acquisition system is connected with the probes. The two-dimensional inhomogeneous field experiment device is capable of well simulating the repairing condition of the polluted soil, brings the convenience for monitoring various electric power parameters in real time in an experiment process, is beneficial to removal of pollutants and reduction of energy consumption, is high in system stability, and has an experiment value and an application prospect.

Description

technical field [0001] The invention relates to a device for purifying and treating pollutants, in particular to a two-dimensional non-uniform electric field experimental device for electrically repairing polluted soil, belonging to the fields of environmental protection and pollution prevention and control. Background technique [0002] With the continuation of my country's industrialization process and the large-dose, large-scale, and long-term use of pesticides in agricultural production, relatively serious soil pollution has accumulated, for example, in heavily polluted enterprises or industrial-intensive areas, industrial and mining areas and surrounding areas Areas with heavy soil pollution and high-risk areas have emerged in regional, urban and suburban areas. At the same time, the types of soil pollution are also showing a trend of diversification and complexity. For example, in many areas, new and old pollutants coexist, and inorganic-organic compound pollution is se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
Inventor 顾莹莹付融冰李鸿江
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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