Prefabricated vertical drain-in situ soil vapor extraction (PVDs-SVE) repairing device and method

Abstract

The invention discloses a prefabricated vertical drain-in situ soil vapor extraction (PVDs-SVE) repairing device and method. The device comprises an extraction assembly, a gas injection assembly and atail gas treatment assembly; the extraction assembly comprises extraction-PVDs, a first ground pipeline and a vacuum pump, and the vacuum pump extracts pollutants adsorbed by the extraction-PVDs through a second ground pipeline, and conveys the pollutants into activated carbon columns of the tail gas treatment assembly for treating; and the gas injection assembly comprises an air compressor, gasinjection-PVDs and the second ground pipeline, and the air compressor delivers air to the gas injection-PVDs through the second ground pipeline. The PVDs-SVE repairing device has the obvious improvingeffect on vapor extraction of a low-permeability soil layer, meanwhile, has the advantages of superior drainage performance, economical performance, practicality, high applicability and the like, andhas the great application prospects in the aspect of repairing and treating of volatile organic contaminated soil.

Description

technical field [0001] The invention belongs to the technical field of environmental restoration, and in particular relates to an in-situ gas phase extraction restoration device for a plastic drainage board and a restoration method thereof. Background technique [0002] With the rapid development of industrialization, urbanization and agricultural intensification, the situation of soil environment in my country is severe. Especially since the end of the last century, a large number of highly polluting enterprises have been relocated or shut down, leaving behind a large number of polluted sites. [0003] Soil Vapor Extraction (SVE) mainly uses vacuum equipment to generate negative pressure, so that volatile organic pollutants in the soil enter the soil gas phase, and flow to the extraction well with the airflow, so as to achieve the purpose of separating from the soil. SVE technology has strong operability, a wide range of pollutants to be treated, and has the characteristic...

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Problems solved by technology

[0004] The present invention needs to set up extraction wells and gas injection wells for the traditional gas phase extraction restoration technology, which requires long preparation time and high cost, and is mostly suitable for sandy soil layers with good permeability, and for fine sand layers with poor permeability Or the technical problem of the poor extraction effect of the silt layer, a plastic drainage board in-situ gas phase extraction repair device is proposed, by using prefabricated plastic drainage boards (PVDs) in the SVE device to replace the traditional extraction wells and gas injection wells , can shorten the air flow path, and ultimately accelerate the removal of pollutants, thereby improving the remediation effect in low-permeability soils

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