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Remediation method of organic contaminated soil

A technology of organic pollution and remediation method, which is applied in the field of soil remediation, can solve the problems of high cost and low heat utilization rate, and achieve the effects of fast heating efficiency, increased residence time and energy saving

Inactive Publication Date: 2015-01-28
常州宝利环保科技有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for remediating high-concentration organic-contaminated soil in view of the problems of low heat utilization rate and high cost when thermal desorption repair technology is used for organic polluted soil at present.

Method used

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  • Remediation method of organic contaminated soil

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Embodiment 1

[0029] The benzopyrene-contaminated soil with a pollution concentration of 200mg / kg has a moisture content of 20%. After passing through the first-stage screw conveyor, the pollutant removal rate is about 5%. After passing through the second-stage conveyor, the pollutant removal rate is 10%. %, the pollutants enter the thermal desorption furnace for heating for 20 minutes, the soil temperature is about 250-300°C, the pollutant removal concentration is 85%, and the soil temperature reaching the brick kiln through the third pole conveyor is 175°C. After the final brick is made, no contaminants can be detected. The heat generated in the thermal desorption process is effectively used, the cost of soil remediation is reduced, and the problem of polluted soil is effectively removed.

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Abstract

The invention relates to the field of soil remediation, in particular to a remediation method of organic contaminated soil. The remediation method comprises the following steps: 1) crushing and screening soil to be remedied; 2) carrying out thermal desorption treatment on the soil remedied after being screened in the first step; 3) conveying the soil subjected to thermal desorption treatment in the second step to a brick kiln under the condition that the soil is not cooled, and burning into bricks; 4) burning waste gas generated in thermal desorption in the second step, and using heat generated by burning for heating the soil to be treated. With the adoption of the remediation method of the organic contaminated soil, the soil subjected to thermal desorption is high in temperature and can be used for making bricks, and thus a great deal of energy is saved; the waste gas is burnt after being purified, energy generated by burning is used for heating a conveyer belt, the heated conveyer belt is capable of carrying out primary heating on the soil, so that thermal desorption efficiency is greatly improved when the soil with higher temperature enters a thermal desorption furnace.

Description

technical field [0001] The invention belongs to the field of soil restoration and relates to a soil restoration method. Background technique [0002] With the high-speed operation of my country's economy, petroleum, chemical, pharmaceutical and other industries have developed by leaps and bounds with their advantages. In recent years, due to the accelerated pace of my country's urbanization process and the implementation of the national "retreat from the second to the third" and "retreat from the city to the park", a large number of petroleum and chemical companies are facing relocation and rectification problems, resulting in the formation or legacy of a large number of polluted sites. Especially in places where volatile (VOCs) and semi-volatile organic compounds (SVOCs) are left behind. In 2010, statistics from the Institute of Geochemistry of the Chinese Academy of Sciences showed that there were 700 to 800 land plots polluted by organic matter in the relocation sites of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/06F23G7/06C04B33/132
CPCY02P40/60
Inventor 周怡
Owner 常州宝利环保科技有限公司
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