Permeable reaction wall in-situ repair method for preventing aquifer pollution

Abstract

The invention discloses a permeable reaction wall in-situ repair method for preventing aquifer pollution. The method is characterized by adopting a permeable reaction wall horizontally arranged and a pumping well; the permeable reaction wall includes a ditch excavated in a pollution rain flowing path; a horizontal field is excavated in the ditch; a reactive medium is paved to form a horizontal permeable reaction wall body; the reactive medium material is selected according to pollutant repair mechanisms, and is layered; soil or sand is filled above the reactive permeable wall for covering to level with the bottom of the ditch; two sides of a wall body are tightly bonded a dam of the ditch to construct an impervious wall to guarantee polluted water to downwards permeate into an underground aquifer through the permeable reaction material wall body; the pumping well is a well, deep to reach the underground aquifer, drilled in middle of the horizontal permeable reaction wall; the well wall is produced by an impervious material; the well bottom is provided with a filter medium layer; and pumped water is from the underground aquifer. The method has the advantages of shallow ditch excavating and well drilling depths, easiness in material layering, high operability and good economic benefit.

Description

technical field [0001] The invention belongs to the technical field of construction methods of water conservancy projects, and in particular relates to an in-situ restoration construction process of a permeable reactive barrier (Permeable Reactive Barrier, PRB for short) for preventing aquifer pollution from the source. Background technique [0002] Groundwater is an important water supply source for human society. With the continuous development of social economy, industrial, agricultural production and human life have produced a large amount of pollution, which is washed by rainwater and poured into the ditch. The aquifer at the bottom of the ditch is thin, there are skylights in the aquifer at the bottom of the ditch, or the ditch passes through ancient rivers, etc. Under these conditions, it often happens that polluted ditch water leaks or directly recharges the underlying aquifer, causing groundwater pollution. This type of pollution is relatively common and is becomin...

AI Technical Summary

Problems solved by technology

[0004] The existing PRB in-situ remediation technology is a passive in-situ remediation technology carried out after the groundwater is polluted. Geological conditions have a strong correlation

However, the groundwater is generally deep, which not only makes the construction difficult, but also consumes a lot of wall filling materials, and is prone to water seepage and collapse, resulting in high repair costs and is not conducive to the replacement of permeable reaction materials in the later stage.

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