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Method for thermal desorption treatment of organic polluted soil

A polluted soil and thermal desorption technology, applied in the field of thermal desorption treatment of organic matter-contaminated soil, can solve the problems of low effective utilization rate of agricultural and forestry solid waste, low organic matter content, poor soil quality, etc., and achieve organic carbon content increase, organic matter The effect of increasing content and restoring soil function

Inactive Publication Date: 2019-04-05
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

[0005] In view of the removal of organic pollutants from organic polluted soil, most of the remediation soil obtained has poor soil quality, low organic matter content, low effective utilization rate of agricultural and forestry solid waste, and serious incineration pollution. A thermal desorption treatment of organic pollution is provided. The soil method, the invention simultaneously realizes the disposal and utilization of organic solid wastes such as crop straws, soil thermal desorption repair and soil function recovery; increases soil organic carbon content, improves soil fertility, and kills harmful pathogenic microorganisms in soil and biomass

Method used

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  • Method for thermal desorption treatment of organic polluted soil

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Effect test

Embodiment 1

[0021] Embodiment 1: organic matter polluted soil is the organic polluted soil of certain chemical industry site;

[0022] Such as figure 1 Shown, a method for thermal desorption treatment of organic matter-contaminated soil, the specific steps are as follows:

[0023] (1) The thermal desorption flue gas at a temperature of 500°C (high-temperature gas from the burner) was contacted and reacted with the organic-contaminated soil for 15 minutes to obtain desorbed waste gas and thermally desorbed soil containing organic pollutants;

[0024] (2) Dry the biomass (crop straw) to a moisture content of ≤12%, and crush it to a length of ≤20cm to obtain a biomass segment;

[0025] (3) Mix the thermally desorbed soil in step (1) with the biomass segment in step (2) to obtain a mixture A. At a temperature of 250°C, the biomass in the mixture A is subjected to low-temperature pyrolysis carbonization reaction and the soil is heated Obtain the remediation soil containing organic carbon and...

Embodiment 2

[0027] Embodiment 2: organic matter polluted soil is the organic polluted soil of certain chemical industry site;

[0028] Such as figure 1 Shown, a method for thermal desorption treatment of organic matter-contaminated soil, the specific steps are as follows:

[0029] (1) The thermal desorption flue gas at a temperature of 400°C (the pyrolysis gas obtained by low-temperature pyrolysis and carbonization in step (3)) was contacted with the organic-contaminated soil for 20 minutes to obtain desorption waste gas containing organic pollutants and thermal desorption soil;

[0030] (2) Dry the biomass (a mixture of crop straw, weeds, rice husk, chaff, shrub branches, dead leaves, and sawdust) to a moisture content of ≤10%, and crush it to a length of ≤18cm to obtain a biomass segment;

[0031] (3) Mix the thermally desorbed soil in step (1) with the biomass section in step (2) to obtain a mixture A. At a temperature of 300°C, the biomass in the mixture A is subjected to low-temper...

Embodiment 3

[0033] Embodiment 3: organic matter polluted soil is the organic polluted soil of certain chemical industry site;

[0034] Such as figure 1 Shown, a method for thermal desorption treatment of organic matter-contaminated soil, the specific steps are as follows:

[0035] (1) The thermal desorption flue gas with a temperature of 700°C (high-temperature gas from the burner) is contacted with the organic-contaminated soil countercurrently for 5 minutes to obtain the desorbed waste gas and thermally desorbed soil containing organic pollutants;

[0036] (2) Dry the biomass (a mixture of crop stalks, weeds and rice husk) to a moisture content of ≤9%, and crush it to a length of ≤15cm to obtain a biomass segment;

[0037] (3) Mix the thermally desorbed soil in step (1) with the biomass section in step (2) to obtain a mixture A. At a temperature of 400°C, the biomass in the mixture A is pyrolyzed and carbonized at a low temperature and the soil is heated Obtain remediation soil contai...

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Abstract

The invention belongs to the technical field of polluted soil renewal and relates to a method for thermal desorption treatment of organic polluted soil. The method includes steps: subjecting thermal desorption exhaust gas at a temperature of 120-700 DEG C and the organic polluted soil to countercurrent contact reaction for 5-30min to obtain organic-pollutant-containing desorption exhaust gas and thermal desorption soil; drying biomass until the moisture content is smaller than or equal to 12%, and crushing to a length smaller than or equal to 20cm to obtain biomass sections; well mixing the thermal desorption soil with the biomass sections to obtain a mixture A, subjecting biomass in the mixture A to low-temperature pyrolysis carbonization reaction at a temperature of 250-450 DEG C, and heating the soil to obtain organic-carbon-containing remediated soil and pyrolysis gas of low-temperature pyrolysis carbonization. The soil subjected to thermal desorption and the biomass are mixed forpyrolysis carbonization, the organic content is substantially increased, soil functions are recovered, and the problem of soil function loss caused by burning damages of organic matters in conventional thermal desorption soil remediation is avoided.

Description

technical field [0001] The invention relates to a method for treating organic polluted soil by thermal desorption, and belongs to the technical field of polluted soil regeneration. Background technique [0002] The problem of soil pollution in my country is very prominent, and there is an urgent need for restoration technology. Contaminated soil can be divided into two types: organic polluted soil and inorganic polluted soil. According to the nature of organic pollutants, from the perspective of technical principles, organic polluted soil remediation technologies mainly include thermal desorption, steam extraction, chemical oxidation / reduction, fixation / stabilization methods , incineration method, microbial method, phytoremediation method, etc. Thermal desorption technology is one of the effective remediation methods of organic polluted soil. Different heat sources are used to heat organic polluted soil to close to or exceed the boiling point of organic matter, so that orga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/06B09C1/08
CPCB09C1/06B09C1/065B09C1/08
Inventor 田森林赵群李英杰黄建洪胡学伟柴小龙曹妍耿映雪徐琳桢张林丰屠依娜
Owner KUNMING UNIV OF SCI & TECH
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