A Pneumatic Fracturing Enhanced Multiphase Extraction System for Contaminated Site Treatment

Abstract

The invention discloses a pneumatic fracturing enhanced multiphase extraction system for treating polluted sites, which comprises a fracturing system unit and a multiphase extraction system unit. The fracturing system unit includes an air compressor, an air heater, a fracturing Well and injection pipe, the outlet end of the air compressor is connected to the inlet end of the air heater, the fracturing well extends to the area below the liquid phase pollution source, its lower end is closed, and there are multiple intervals along the length of the fracturing well The inlet end of the injection pipe is connected to the outlet end of the air heater, and the outlet end of the injection pipe extends into the fracturing well, which is used to inject the heated air into the fracturing well and penetrate through the corresponding air outlet slit into contaminated soil. The invention utilizes pneumatic fracturing to create cracks in the formation, improve the air permeability of the unsaturated zone, change the permeability and hydraulic conductivity of the aquifer, etc., and the flow of hot air can increase the saturated vapor pressure of volatile pollutants in this zone and promote their volatilization , greatly improving the extraction efficiency of MPE.

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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