In-situ repair system and method for deep layer stirring-hot air injection of polluted soil

Abstract

The invention provides an in-situ repair system and an in-situ repair method for deep layer stirring-hot air injection of polluted soil. According to the in-situ repair system, the lower end of a hot air spray pipe is communicated with a drill body core pipe in a drill; the upper end of the hot air spray pipe is communicated with an air outlet of a hot air compressor; and a mixed air-liquid pipeline is connected between a coverage cover and an air-liquid separator. According to the method, the drill is drilled in a target soil layer up and down in a reciprocating mode according to designed elevation, wherein the diameter of a stirring drill hole is 1.5 to 2.5 meters, the depth of the stirring drill hole is 9 to 12 meters, the injection pressure of hot air is 1 to 2 MPa, and the temperature of the hot air is 90 to 110 DEG C. According to the technology of the in-situ repair system and the in-situ repair method, the application range of strata can be expanded to low-middle permeable strata, and the range of the types of applicable pollutants is also increased, for example, the technology is still valid to semivolatile organic matters such as anilines. By the in-situ repair system and the in-situ repair method, the problem of 'smearing' of a soil vapor extraction (SVE) technology in the later period of repair can be solved, so that the repair efficiency is improved greatly, and the repair period is shortened greatly.

Description

technical field [0001] The invention relates to an in-situ remediation system and method for deep stirring of polluted soil and injection of hot air, and belongs to the technical field of polluted soil remediation systems and remediation methods. Background technique [0002] The soil environment is the basis for human survival. With the process of global industrialization, organic pollution has surpassed heavy metal pollution and radioactive pollution and has leapt to the top. In recent years, soil pollution in my country has become increasingly serious, which not only destroys the ecosystem of the soil itself, but also directly or indirectly endangers human health. What is more serious is that volatile organic pollutants will migrate to deep layers in unsaturated areas, especially posing a threat to groundwater resources. , causing serious consequences, so there is an urgent need to research and develop engineering restoration technologies that are in line with my country's...

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to solve the problem of poor remediation efficiency and pollutant removal effect of the existing in-situ system, and the ubiquitous "smearing effect" of SVE technology in the later stage of remediation, and then provide a method for deep stirring of polluted soil - In situ repair system and method with hot air injection

Images