Thermal driving desorption restoration method of polluted soil

Abstract

The invention relates to a thermal driving desorption restoration method of polluted soil. The method comprises the steps that a thermal driving desorption restoration system of the polluted soil is adopted; waste heat of high-temperature flue gas, high-temperature air, high-temperature steam or high-temperature liquid serves as a heat source; and indirect heating is performed to restore the polluted soil. The restored soil can reach a subsequent recycling requirement. The method is suitable for restoring the soil polluted by organic matters such as VOCs (volatile organic compounds), SVOCs (semi volatile organic compounds), PAHs (polycyclic aromatic hydrocarbons), PCBs (polychlorinated biphenyls), TPHs (total petroleum hydrocarbons) and pesticides, is also suitable for restoring the soil polluted by thermal-sensitive heavy metal such as Hg and As, is high in reaction speed, short in restoration cycle, safe and stable in operation, and economically feasible, adopts automatic control and real-time monitoring, has no secondary pollution, and has good environment-friendly and social benefits; and a removal rate of a pollutant reaches above 99%.

Description

technical field [0001] The invention relates to a thermal drive desorption repair method for polluted soil, which belongs to the category of environmental protection equipment. Background technique [0002] The situation of soil pollution in my country is becoming more and more serious. With the development of my country's industry and agriculture and the acceleration of urbanization, in the process of human production and life, many lands have been polluted due to inadequate environmental protection measures, and the soil environment has deteriorated. There are many reasons for the deterioration of the soil environment, such as the extensive use of chemical pesticides and agricultural fertilizers, the wanton discharge of industrial wastewater, the discharge of toxic and harmful pollutants, especially the random stacking and landfilling of toxic and harmful solid waste, all of which will cause soil pollution. Toxic and harmful substances in polluted soil will enter the huma...

AI Technical Summary

Problems solved by technology

[0005] 1. The technical repair cycle of phytoremediation, microbial remediation, and normal temperature analysis is very long, and some may take months or even years

[0006] 2. Physical isolation refers to the direct covering of the site and landfilling in another place. This method can block the exposure route, but cannot reduce its toxicity. The site will have long-term environmental risks and land use function restrictions

The disadvantages of this method are as follows: firstly, because the cement rotary kiln adds too much polluted soil, which will affect the quality of cement, the amount of polluted soil treated by this method is limited; secondly, this method is only applicable to places where the polluted soil is closer to the cement factory. If the distance is long, the transportation cost of contaminated soil will increase, and the treatment cost will be increased, so the economy will be poor.

Images