Pneumatic fracturing enhanced multiphase extraction system for contaminated site treatment

Abstract

The invention discloses a pneumatic fracturing enhanced multiphase extraction system for contaminated site treatment, wherein the system comprises a fracturing system unit and a multiphase extractionsystem unit, the fracturing system unit comprises an air compressor, an air heater, a fracturing well and an injection pipe, and the outlet end of the air compressor is connected with the inlet end ofthe air heater. The fracturing well extends to an area below a liquid phase pollution source, the lower end of the fracturing well is closed, a plurality of air outlet gaps arranged at intervals areformed in the length direction of the fracturing well, the inlet end of the injection pipe is connected with the outlet end of the air heater, the outlet end of the injection pipe extends into the fracturing well and is used for injecting heated air into the fracturing well, and the air permeates into contaminated soil through corresponding air outlet gaps. According to the method, cracks are generated in the stratum through pneumatic fracturing, the air permeability of an unsaturated zone is improved, the permeability, hydraulic conductivity and the like of a water-containing layer are changed, saturated vapor pressure of volatile pollutants in the zone can be improved through flowing of the hot air, volatilization of the volatile pollutants is promoted, and the extraction efficiency of MPE is greatly improved.

Description

technical field [0001] The invention relates to the technical field of contaminated site remediation, in particular to a pneumatic fracturing enhanced multiphase extraction system for contaminated site treatment. Background technique [0002] Multiphase Extraction (MPE) is an environmentally friendly soil and groundwater remediation technology, which has less disturbance to the ground environment and is suitable for various types of contaminated sites such as gas stations, petrochemical companies and chemical companies, especially for existing Remediation of contaminated soil and groundwater in the case of non-aqueous liquid pollutants (NAPL). It has the advantages of high repair efficiency, large affected area, and wide application range. [0003] Usually, MPE technology uses vacuum and / or water pump extraction to simultaneously pump soil gas, groundwater and NAPL from underground polluted areas to the ground for multi-phase separation and treatment to achieve the treatmen...

AI Technical Summary

Problems solved by technology

However, the above method needs to pump mortar into the formation, which greatly disturbs the formation, the operation is relatively complicated and increases the labor load, and the grouting and fracturing gap distance is relatively short, which is not conducive to the cost control of large-scale site restoration

[0005] Therefore, it is necessary to develop an in-situ multiphase extraction and remediation system for contaminated sites with poor permeability and complicated pollution conditions, so as to improve the above problems

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