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

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...

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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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