In situ microwave repairing method and apparatus of contaminated soil

A technology of contaminated soil and remediation method, which is applied in the field of remediation of industrial point source contaminated sites, can solve the problems of no systematic remediation technology and industrialization discussion, and achieve the effect of in-situ soil remediation, wide range and strong versatility

Inactive Publication Date: 2009-08-26
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the research focuses on the ex-situ remediation of contaminated soil by microwave, focusing on the laboratory research on the effect and mechanism of remediation of contaminated soil, without discussing the systematic and industrialization of remediation technology

Method used

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  • In situ microwave repairing method and apparatus of contaminated soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0033]For point source polluted sites where PCBs are piled up, microwave magnetrons use lower power (such as 2kW). Before the treatment, the surface soil of the PCB-contaminated site should be loosened to remove large pieces of debris, and the large pieces of soil should be smashed to make the particles uniform. Then add water to the soil and mix so that the soil moisture content is 10-30%. Push the microwave remediation equipment on the contaminated soil, and set the microwave irradiation time to 5-30 minutes, so that the pollutants in the soil can be volatilized by thermal desorption under the action of microwaves. At the same time, a gas collection device is externally connected to the gas collection port. The gas collector uses a condensing device or fills with an adsorbent to condense or adsorb the pollutant gas. After the microwave treatment is completed, the pollutants collected in the gas collector are subjected to subsequent treatment.

Embodiment example 2

[0035] For point source polluted sites where heavy metals are piled up, microwave magnetrons use higher power (such as 10kW) radiation due to the high temperature required for the immobilization of heavy metals. Due to the low volatility of heavy metals, there is no external gas collection device. Before the treatment, the surface soil of the heavy metal-contaminated site shall be loosened to remove large pieces of debris, and the large pieces of soil shall be smashed to make the particles uniform. Then a certain number of iron rods are evenly inserted into the soil as a microwave absorber. Put the microwave remediation equipment on the polluted soil and irradiate it with microwave for 30min-120min. When there is an iron bar, the polluted soil with sensitizer will heat up rapidly under the action of microwave, and the heavy metal pollutants in it can be destroyed at high temperature. Effectively immobilize the leachate to meet the standard, thereby reducing its impact and ris...

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Abstract

The invention belongs to the technical field of pollutant disposal in related soil for environmental protection, relating to an in situ microwave repairing method and apparatus of contaminated soil. In the invention, microwave is used as a heat source, different microwave absorbents are added to the soil according to the characteristics of pollutant and are mixed uniformly; the absorption and heat-transfer capabilities of contaminated soil system for the microwave are strengthened by using the effect between the microwave and the absorbents so that each pollutant in the soil is treated by three mechanism such as evaporation, decomposition or being fixed. The apparatus uses a moveable microwave case, the microwave generator is arranged inside the microwave case, the radiation port of a radiator is arranged at the opening of the case bottom and is connected with the microwave generator by wave guide, the case is provided with a controller electrically connected with the microwave generator, and the bottom of the case is provided with a microwave shield cover capable of being disassembled. The method has short processing time, flexible operation, strong universality and high efficiency, does not pollute the environment and brings new secondary pollution and is an efficient method for in situ repair of contaminated soil.

Description

technical field [0001] The invention belongs to soil remediation technology, and relates to an in-situ remediation method and equipment for polluted soil, and is mainly applicable to the remediation of industrial point source polluted sites. Background technique [0002] With the rapid development of the economy, site pollution is becoming more and more serious in our country and has become an environmental problem that cannot be ignored. 80% of my country's industrial enterprises are concentrated in cities. Petroleum, chemical, pesticide, mining, printing, building materials, spraying and other industries will produce a lot of pollutants during production. The pollutants piled up and discharged in the sites of various industries have caused serious site pollution. If the various pollutants in the abandoned polluted sites are not disposed of or handled properly, they will definitely have adverse effects on the surrounding ecological environment and human health. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00H01S1/00
Inventor 陆晓华林莉陈静
Owner HUAZHONG UNIV OF SCI & TECH
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