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Microwave electric soil in-situ restoration device and restoration method

An in-situ remediation and soil technology, applied in the restoration of polluted soil, can solve problems such as non-volatile and refractory degradation, shorten the restoration period, speed up the restoration process, and promote the migration speed.

Inactive Publication Date: 2013-09-11
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to address the deficiencies of the existing electrodynamic restoration and soil thermal restoration technologies, combine and strengthen the two, and propose a microwave electrodynamic soil in-situ treatment technology, which uses electrodynamic restoration and microwave heating combined restoration technology in the early stage Part of the organic pollutants and heavy metals in the soil, the high-temperature microwave soil thermal remediation technology is used in the later stage to deal with the organic pollutants and residual heavy metals that are difficult to volatilize and degrade

Method used

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Examples

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Effect test

example 1

[0041] Select a range of 5m*5m in the polluted soil containing Cd Zn Cu, benzene and acetone around the electroplating factory for treatment. The soil pollution depth is about 1.5m. The microwave absorbing material is evenly buried in this area, and a 5.3*5.3*2.3 gas collection shed, using PbO 2 The / Ti electrode is the anode, and the graphite is the cathode; the electrolysis buffer is 0.5mol / L, acetic acid-sodium acetate buffer solution with a pH value of 3; the constant voltage is 15V, the corresponding electric field strength is 1.5V / cm, and the processing time is set to 30h,. Install a microwave emission device on the gas collection shed, place a temperature sensor in the contaminated area, and start processing. After the electrodynamic repair device is turned on, the positively charged ions in the soil will move to the cathode and concentrate in the area near the cathode, and the negatively charged ions will enrich in the anode area. When the pH exceeds the set critical...

example 2

[0043] Select a range of 2.5m*3m in the polluted soil containing Ag, Cd, n-hexane, and xylene around the chemical plant for treatment. The soil pollution depth is about 1.2m, and the microwave absorbing material is evenly embedded in this area. A 2.8*3.8*2.3 gas-collecting shed is set above, and graphite plates are used as electrodes for the anode and cathode; citric acid-sodium citrate buffer solution with a pH value of 6 is used as the electrolytic buffer solution; the constant voltage is 2V, and the corresponding electric field strength is 0.2 V / cm, the treatment time is 60h. Install a microwave emission device on the gas collection shed, place a temperature sensor in the contaminated area, and start processing. After the electrodynamic repair device is turned on, the positively charged ions in the soil will move to the cathode and be enriched in the area near the cathode, and the negatively charged ions will move to the anode and be enriched in the area near the anode. Wh...

example 3

[0045] Select a range of 2m*2m in the polluted soil containing Pb, Cd, phenols, aldehydes, and organic amines around the battery factory for treatment. The soil pollution depth is about 1.0m. Make a basic measurement of the target pollutant content in this area, and then Evenly embed microwave absorbing materials in this area, set up a 2.5*2.5*1.5 gas collection shed above the polluted area, use graphite plates as electrodes for both cathode and anode; use 0.5mol / L electrolytic buffer solution with a pH value of 3 The acetic acid-sodium acetate buffer solution; the constant voltage is 12V, the corresponding electric field strength is 1.2V / cm, and the treatment time is set to 24h. Install a microwave emission device on the gas collection shed, place a temperature sensor in the contaminated area, and start processing. After the electrodynamic repair device is turned on, the positively charged ions in the soil will move to the cathode and concentrate in the area near the cathode,...

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Abstract

The invention discloses a microwave electric soil in-situ restoration device and a restoration method, and belongs to the technical field of in-situ restoration for soil pollutions. The device consists of an electrode system, a microwave heating system and an underground water circulation system and comprises a negative electrode well (1) and the like, wherein a negative electrode (3) is arranged in the negative electrode well (1). A microwave absorption material is buried into the soil; a closed gas collection shed is constructed; a pH monitoring device and a temperature sensor are arranged in the closed gas collection shed; part of organic pollutants and heavy metals in the soil are treated; underground water is pumped out and then injected into the soil to increase the migration speed of live particles and accelerate the soil heating process; volatile organic compounds are recycled; distilled water is injected into the underground water; non-volatile and non-degradable organic pollutants and residual heavy metals are treated by a high-temperature microwave soil thermal restoration technology. The technical equipment is compact in structure, easy to operate and high in reliability and has high popularization potential home and abroad and in particular has a wide application prospect to composite soil pollutions with the heavy metals and the organic compounds.

Description

technical field [0001] The invention relates to a microwave electric soil in-situ repair device and a repair method, belonging to the technical field of in-situ repair of soil pollution. Background technique [0002] With the process of industrialization, urbanization and modern agriculturalization in our country, soil pollution is becoming more and more serious, and it gradually manifests as compound pollution of various pollutants. In particular, heavy metal pollution and highly toxic and persistent organic pollution are the most prominent. They mainly come from abandoned factories and mines, sewage irrigation areas, domestic garbage, industrial waste, and the extensive use of pesticides and fertilizers. Investigations and studies have shown that heavy metal pollution such as cadmium, arsenic, and lead in my country has caused huge economic losses. On the other hand, organic pollution has become a current research hotspot due to its persistent, highly toxic, accumulative,...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/06
Inventor 何理李晶董焕焕潘海洋卢宏玮
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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