Anti-blocking zero-valent iron permeable reactive barrier

Abstract

The invention discloses an anti-blocking type zero-valent iron permeable reactive barrier, and belongs to the technical field of groundwater pollution remediation. A barrier reaction area is arrangedat the downstream of pollution plume; the barrier reaction area is filled with a mixed filler; perennial deep-rooted plants are planted near the ground of the barrier reaction area; ectomycorrhizal fungi with iron resistance are inoculated near the root systems of the perennial deep-rooted plants; the barrier is used for repairing underground water polluted by heavy metals or organic pollutants; the mixed filler is formed by mixing zero-valent iron and clay according to a mass ratio of the zero-valent iron to the clay of 1:1 to 1-1.5, and the proportion of the zero-valent iron and the clay isdetermined according to the concentration and the variety of pollutants. The barrier can be applied to restoration of underground water polluted by heavy metals and organic pollutants, through the coupling effect of plants and microorganisms, the pollutant removal efficiency of zero-valent iron is enhanced; meanwhile, the passivation of zero-valent iron and blockage caused by passivated zero-valent iron are prevented, and the barrier is more environmentally friendly and economical.

Description

technical field [0001] The invention relates to the technical field of groundwater pollution restoration, and more specifically relates to an anti-clogging type zero-valent iron permeation reaction wall. Background technique [0002] As an important source of drinking water, groundwater is of great significance to ensuring the water supply for residents' lives. However, with the rapid development of social economy, groundwater pollution is inevitable, which has seriously affected the drinking water safety of local residents in some areas. Therefore, the restoration of contaminated groundwater is imminent. According to the restoration location, the groundwater restoration technology can be divided into in-situ restoration technology and ex-situ restoration technology. Among them, the in-situ technology has the advantages of less environmental disturbance and low cost. Repair technology is widely used as an in situ repair technology. More than 400 permeable reactive walls ha...

AI Technical Summary

Problems solved by technology

After more than 20 years of research and application, it is found that zero-valent iron PRB has the problems of wall material passivation and wall clogging, which leads to the reduction of PRB treatment capacity, and even the pollutant treatment is not up to standard

In response to this problem, there have been some works to solve this problem, such as filling zero-valent iron and activated carbon at the same time to form iron-carbon micro-electrolysis; filling modified zero-valent iron materials (bimetallic or multimetallic materials); electrochemical passivation Although the above improved technologies can effectively solve the problems of zero-valent iron PRB passivation and blockage, they cannot solve the problem for a long time because of the short duration, high cost or continuous treatment.

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