Horizontal well injection remediation system and method for pressed and covered contaminated soil or underground water

Abstract

The invention provides a horizontal well injection repair system and method for pressed and covered contaminated soil or underground water, and the system comprises a well forming unit which is used for forming an underground injection channel at the pressed and covered contaminated soil or underground water; a prefabricated horizontal well unit which is arranged in the underground injection channel and provided with a soil entering section, a transverse section and a soil exiting section; a chemical preparation unit for preparing a chemical and supplying the chemical to a chemical storage tank; and a chemical injection unit which is used for conveying the chemical in the chemical storage tank to the prefabricated horizontal well unit through an injection pump. The prefabricated horizontalwell unit is provided with an outer pipe and an inner pipe to form an inner and outer double structure, and sieve holes with hole sites coinciding and / or staggered are distributed in the pipe walls of the outer pipe and the inner pipe. The difficult problem of restoration under obstacles difficult to overcome during restoration of a vertical injection well can be solved through horizontal chemical injection, zero influence on the earth surface can be basically achieved, and meanwhile pressed and covered polluted media can be restored as much as possible.

Description

technical field [0001] The invention relates to the technical field of contaminated site restoration, in particular to a horizontal well injection restoration system and method for compressed polluted soil or groundwater. Background technique [0002] With the rapid development of industrialization in our country, a large number of toxic and harmful substances have infiltrated into the soil and groundwater, and the restoration of soil and groundwater is imminent. The existing methods of remediation of contaminated soil and groundwater can be divided into in-situ remediation and ex-situ remediation according to the remediation site. Ex-situ restoration has the advantages of "short, flat and fast", but for some sites where there are objects on the surface that are not suitable for excavation (such as buildings, rivers, roads, public buildings, farmland and protected areas on the surface), this technology has disadvantages. Applicability; and these sites can be rehabilitated b...

AI Technical Summary

Problems solved by technology

A horizontal reaction well for groundwater and soil remediation (CN109985897A) discloses an active in-situ groundwater and soil remediation technology, which uses prepacked medicaments to bring solid medicaments into the horizontal well, utilizing the interaction between groundwater and medicaments Contact for site restoration, but because this technology uses vertical wells to penetrate into the soil when laying horizontal reaction wells, it is difficult to lay horizontal pipes, and once the inner pipe agent fails, the inner pipe needs to be replaced, and continuous injection cannot be achieved

An in-situ horizontal well soil remediation system and method (CN109530424A) discloses an in-situ horizontal well soil remediation system and method. The method adopts the injector injection method, which is beneficial to medicament injection, but due to the injection effect, the medicament tends to move in a straight line. For front injection, the area behind the injection nozzle is difficult to reach, or there is a repair blind spot

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