Controllable multifunctional pumping and injecting vertical shaft device for in situ remediation of soil and groundwater

Abstract

The invention belongs to the technical field of soil remediation for environmental geotechnical engineering, and discloses a controllable multifunctional pumping and injecting vertical shaft device for in situ remediation of soil and groundwater. The controllable multifunctional pumping and injecting vertical shaft device comprises an outer screen pipe, an adjusting pipe, a pumping and injecting pipe, a supporting mechanism and an adjusting mechanism; the outer screen pipe is fixed in a soil layer to form a vertical shaft space, the adjusting pipe is arranged in an inner cavity of the outer screen pipe, the pumping and injecting pipe is embedded in the adjusting pipe, the supporting mechanism is in supporting connection with the adjusting pipe, and the adjusting pipe can rotate relative tothe supporting mechanism; and the adjusting mechanism is connected with the adjusting pipe to drive the adjusting pipe to rotate, the pipe wall of the outer screen pipe is provided with a first through hole array, the pipe wall of the adjusting pipe is provided with a second through hole array, and the pipe wall of the pumping and injecting pipe is provided with a third through hole array. According to the controllable multifunctional pumping and injecting vertical shaft device, efficient multiphase pumping and extraction remediation can be achieved aiming at different pollutant distributionmodes.

Description

technical field [0001] The invention relates to the technical field of soil restoration in environmental geotechnical engineering, in particular to a controllable multifunctional pumping and injection shaft device for in-situ restoration of soil and groundwater. Background technique [0002] The results of the first national soil pollution survey in 2014 showed that the security situation of my country's soil environment is not optimistic, with a total exceeding rate of 16.1%. Although inorganic pollution is still the main type of pollution at present, organic pollution is getting more and more attention. Statistics from abroad show that sites polluted by volatile and semi-volatile organic compounds account for more than 80% of the total polluted sites, with a large volume and a wide area, generally heavy pollution, complex pollutant components, high toxicity, and often greater health risks. During the restoration process, due to the volatilization and diffusion of pollutan...

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Problems solved by technology

However, due to the complex conditions of the polluted site, the distribution of pollutants in the stratum is extremely uneven, and it is easy to have a repair dead zone, which reduces the repair efficiency; For the purpose, it is usually necessary to set up different lengths and multiple groups of screen extraction wells for construction according to the groundwater level and the distribution of pollutants. The repair cost is high and causes a great waste of resources.

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