Carbonization repair method of volatile organic compound-heavy metal compound polluted soil

A technology for soil contaminated with volatile organic compounds and heavy metals, applied in the restoration of polluted soil, etc., can solve the problems of low restoration efficiency, high economic cost, secondary pollution, etc., and achieve high restoration efficiency, high continuous operation rate, and avoidance of escape. The effect of scatter and waste

Inactive Publication Date: 2018-10-19
NANJING FORESTRY UNIV
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Problems solved by technology

[0008] The present invention provides a volatile organic compound-heavy metal compound pollution solution for the problems of low repair efficiency, long construction period, easy secondary pollution, high economic cost, and high leaching rate existing in the existing composite polluted soil treatment technology. Soil carbonization remediation method, through compound polluted soil pretreatment, separation and extraction of organic pollutants, curing agent blending, granulation of polluted soil homogeneous mixture, carbonization of polluted soil homogeneous particles, storage and maintenance of carbonized polluted soil particles, waste liquid Several steps such as waste gas collection, waste heat utilization, and resource utilization can solve the above problems, improve the effect of remediation treatment of composite polluted soil, speed up the repair period, reduce the treatment cost and the leaching rate of heavy metal pollutants, and avoid remediation treatment Secondary pollution in the process, while making full use of the greenhouse gas carbon dioxide and the waste heat in the carbonization process, the uniformity of carbonization and solidification is improved, the application range is wider, and the resource reuse of compound polluted soil and carbon dioxide in engineering construction is realized.

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  • Carbonization repair method of volatile organic compound-heavy metal compound polluted soil

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Embodiment 1

[0043] A carbonation restoration method for volatile organic compound-heavy metal composite polluted soil, characterized in that it comprises the following steps:

[0044] a. Pretreatment of composite polluted soil: in the pretreatment device 1, the plant roots, weeds, domestic garbage, solid waste, gravel and other debris in the volatile organic compound-heavy metal composite polluted soil to be treated are passed through mechanical raking nails or The vibrating screen removes the polluted soil and breaks the polluted soil into small particles of polluted soil through the built-in crushing device. The composition and concentration of heavy metals are monitored by the heavy metal pollution monitor in the pollution monitoring device 2;

[0045] b. Separation and extraction of organic pollutants: Open the feeding valve 4, the electric heating plate 7, the stirring device, the exhaust fan A19 and the second control valve 20 in turn, adjust the single feeding amount according to t...

Embodiment 2

[0057] On the basis of Example 1, when the organic pollutant in the composite polluted soil is gasoline, the gasoline concentration in the soil is 4g / kg, and the initial moisture content is about 20%, the minimum temperature when the electric heating plate is set to start is 40°C, That is, when the temperature is lower than 40 ℃, the electric heating plate is automatically activated, and the pumping time is 30 minutes, and the removal rate of organic pollutants is more than 95%. When the gasoline in the polluted soil is volatilized, the moisture content of the polluted soil is 5%-7%, the powder curing agent added to the heavy metal polluted soil is 0%, the slurry curing agent added is 25%, and the slurry curing agent is 0%. The water-cement ratio is 2.0, and the slurry curing agent is composed of water glass, magnesium oxide and cement, and the ratio of the three components is 20:40:40. When the particle size of the solidified particles is 3 cm, under the carbon dioxide pressu...

Embodiment 3

[0059] On the basis of Example 1, when the organic pollutant in the composite polluted soil is benzene, the concentration of benzene in the soil is 5g / kg, and the initial moisture content is about 25%, the minimum temperature when the electric heating plate is set to start is 60°C, That is, when the temperature is lower than 60°C, the electric heating plate is automatically activated, the pumping time is 60 minutes, and the removal rate of organic pollutants is more than 90%. When the gasoline in the polluted soil is volatilized, the moisture content of the polluted soil is 8%-10%, the powder curing agent added to the heavy metal polluted soil is 5%, the slurry curing agent added is 20%, and the slurry curing agent is The water-cement ratio is 2.0, the powder curing agent is magnesium oxide, calcium oxide and cement, and the ratio of the three is 40:20:40; the slurry curing agent is composed of water glass, magnesium oxide and cement, and the ratio of the three components is 20...

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Abstract

The invention discloses a carbonization repair method of volatile organic compound-heavy metal compound polluted soil, and belongs to the field of polluted soil repair. The method comprises the stepsof compound polluted soil pretreatment, organic pollutant separation and extraction, curing agent mixing, granulation of polluted soil uniform mixtures, carbonization of polluted soil uniform mixed granules, storage and maintenance of carbonized polluted soil particles, waste liquid/waste gas collection, waste heat utilization and resource utilization. The heating time, the curing agent mixing quantity and the carbonization time are adjusted by actually measuring the organic matter components and concentrations of the compound polluted soil, heavy metal components and contents, temperature andthe water content, and therefore the optimal work efficiency is achieved. In the working process, volatile organic pollutants are extracted, and dust, waste gas and carbonized heavy metal are absorbed. The method is safe, rapid, low-carbon, environment-friendly and high in continuous working rate, produced carbonized polluted soil particles are high in hardness and strength and low in leaching efficiency and can be used as roadbeds, airfield runways, engineering backfill and the like, and great engineering construction significance is achieved.

Description

[0001] Field of study [0002] The invention discloses a carbonization restoration method for volatile organic compound-heavy metal composite polluted soil, which belongs to the technical field of ecological environment restoration, and in particular relates to the treatment of volatile organic compounds and heavy metal pollutants in the composite polluted soil. Background technique [0003] Soil is a non-renewable resource for human survival. Toxic and harmful residues in soil and accumulation of pollution have become one of the most concerned environmental problems in the current society. In the long-term industrialization process of mining, smelting, chemical industry, etc., serious soil pollution problems have occurred in large areas of industrial and mining enterprises, and they have spread across the country at a speed and trend that cannot be ignored. With the rapid advancement of my country's industrial structure adjustment and urbanization process, some polluting ente...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08B09C1/06B09C1/00
CPCB09C1/00B09C1/005B09C1/06B09C1/08
Inventor 蔡光华刘松玉杜广印邵光辉赵志峰黄容聘
Owner NANJING FORESTRY UNIV
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