A composite process based on thermal desorption for treating polluted soil

Abstract

The invention discloses a composite technology taking thermal desorption as a main process for contaminated soil remediation. The composite technology specifically comprises the following steps of a,carrying out screening; b, carrying out drying; c, carrying out thermal desorption; d, carrying out cooling; and e, carrying out secondary cooling. According to the composite technology, disc type thermal desorption equipment is adopted, the number of internal rotating devices is small, the amount of dust generated is small, and the energy consumption is low; high-temperature soil subjected to thermal desorption is cooled by adopting a water indirect cooling and air direct cooling mode, and meanwhile, recycled energy is used for drying pretreatment for the soil; and when the soil is subjectedto secondary cooling, persulfate is caused to generate free radicals by utilizing the heat of the soil so as to further decompose pollutants in the soil. The composite technology has the advantages that thermal desorption is taken as the main process, chemical oxidation is taken as an auxiliary process, and therefore a relatively high remediation standard can be achieved at a time.

Description

technical field [0001] The invention relates to the fields of environmental protection and soil treatment, in particular to a composite process mainly based on thermal desorption for treating polluted soil. Background technique [0002] The problem of soil pollution in my country has a long history. With the rapid development of industry, a large amount of waste water, waste gas and solid waste are discharged into the environment, causing soil pollution. As early as the 1980s, some scholars called for the protection of the soil environment, but they have not been paid attention to. The frequent occurrence of soil environmental pollution incidents in recent years has exposed the prevalence and severity of soil pollution. The restoration and reuse of polluted land has become an urgent problem to be solved. Soil pollution control has become the focus of attention of the academic circle and the environmental protection industry. . The current remediation technologies mainly in...

AI Technical Summary

Problems solved by technology

[0005] If the soil has been polluted for a long time, the polluted organic matter in the soil may be in a blocked state, and it is difficult to volatilize the organic matter. It is difficult to treat the soil to the restoration target only by thermal desorption, or it consumes high energy consumption.

Images