A bidirectional in-situ blocking and remediation system for nitrogen pollution transport in shallow groundwater

Abstract

The invention relates to a two-way in-situ blocking repair system for nitrogen pollution migration in shallow groundwater, which is used for groundwater pollution control. It mainly includes infiltration wells, repair fillers, filter layers, vegetation secondary adsorption retention areas and monitoring wells. The infiltration wells are laid vertically in line with the contamination plumes to expose shallow aquifers. Organic permeation holes are equidistantly arranged on the parallel cylinder generatrices on the well wall. A restoration filler is located within the well. The filter material layer is covered and arranged outside the well. Monitoring wells are located on both sides of the infiltration well. The vegetation secondary adsorption interception area is located on the water outlet side of the infiltration well restoration. Compared with the existing technology, this system does not require ground devices and power facilities, and the construction, operation and maintenance costs are low; it is easy to construct, overcomes the large-scale excavation and earthwork of PRB; and reduces the disturbance to the groundwater environment. It integrates biodegradation, physical adsorption, chemical reduction and phytoremediation to strengthen the effect of groundwater restoration. The two-way blockage of nitrogen pollution migration in groundwater lateral runoff and vertical seepage has broad application prospects.

Description

technical field [0001] The invention belongs to the field of groundwater pollution control, in particular to a two-way in-situ blocking repair system for nitrogen pollution migration in shallow groundwater. Background technique [0002] In recent years, groundwater nitrate pollution has become widespread. In response to this situation, domestic and foreign scholars have conducted extensive research and achieved many research results. Among them, in-situ remediation technology is one of the methods commonly used in academia and engineering circles. The more commonly used in-situ treatment technologies for groundwater include injection (air disturbance, in-situ chemical oxidation / reduction, biological aeration, circulation well) and There are two types of permeable reactive walls (PRB). [0003] Injection in-situ remediation technology mainly injects substances such as liquid and gas into the groundwater layer to promote direct chemical reactions between the injected substan...

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Problems solved by technology

[0008] The above-mentioned inventive devices and equipment all require power facilities or ground facilities, and there are many constructions, and the process and operation steps require precision, which is not conducive to later maintenance; in the process of use, water needs to be pumped, which is likely to cause changes in the hydraulic characteristics of groundwater and stratum structures. Reduced repair efficiency and ground subsidence in different degrees; the above-mentioned equipment is a single integrated structure, which is difficult to apply to the repair of large-scale contaminated sites

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