Method for retarding heavy metal migration and application thereof

A technology of heavy metals and interpolation method, applied in the field of environmental restoration, can solve the problems of large work investment, lack of sustainable use capacity of the site, high long-term maintenance costs, etc., and achieve a significant interception effect

Pending Publication Date: 2022-02-18
SICHUAN UNIV
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Problems solved by technology

However, in the practice of most phytoremediation methods, the restoration work is purely for the natural environment, and this kind of work requires a lot o

Method used

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  • Method for retarding heavy metal migration and application thereof
  • Method for retarding heavy metal migration and application thereof
  • Method for retarding heavy metal migration and application thereof

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experiment example

[0049] Take the cultivation of ecological isolation zone in a pyrite mining area in southwest Sichuan Province as an example. The upstream soil in this area is compound polluted by various heavy metals (cadmium, chromium, nickel, copper), and accompanied by a large amount of zinc and lead. According to the detected soil heavy metal pollution data, use the Inverse Distance Weighted interpolation method in ArcGIS to draw the regional soil heavy metal spatial distribution map as follows Figure 3-8 As shown, according to the Normalized Difference Vegetation Index (NDVI) through the function of Spatial Analyst Tools, combined with Figure 3-8 , calculated and determined that the location of the ecological isolation zone is 1500m away from the slag pile, and the area is 600m 2 , and trim the land in this area to facilitate the planting of the ecological isolation zone.

[0050] Such as Figure 4 As shown, the area is divided into three areas of the same size and shape, the first...

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Abstract

The invention relates to the technical field of environmental restoration, and discloses a method for retarding heavy metal migration and application thereof. The method for retarding heavy metal migration comprises the steps that according to soil heavy metal pollution data, an Inverse Distance Weighted interpolation method in ArcGIS is used for clarifying spatial distribution of heavy metals in a pollution area, and buffer areas with different distances are arranged according to the distribution situation of the heavy metal; according to a normalized vegetation index, the area of each distance isolation belt is determined through ArcGIS; shrubs and herbaceous plants are planted in the isolation belt, the shrubs comprise at least one of photinia fraseri, rhododendron, pyracantha fortuneana and coriaria sinica, and the herbaceous plants comprise at least one of miscanthus floridulus, festuca arundinacea, vetiver grass, horseweed herb and senecio scandens. According to the method, the arrangement position of the isolation belt can be accurately positioned, the effect of high heavy metal retarding capacity is achieved by constructing the grass-shrub plant community, and the method is suitable for being applied to the mining area vegetation recovery method.

Description

technical field [0001] The invention relates to the technical field of environmental restoration, in particular to a method for retarding the migration of heavy metals and an application of the method for retarding the migration of heavy metals in vegetation restoration in mining areas. Background technique [0002] At present, the heavy metal pollution barrier technology for exposed slag piles (masonry slag dams, barrier walls, curtain grouting, etc.) is extensive, with a large amount of engineering, high treatment costs, and high expenses. Therefore, it is very urgent to develop cost-effective and environmentally friendly key technologies for the prevention and control of pollutant migration in exposed slag piles by using ecological methods. However, in the practice of most phytoremediation methods, the restoration work is purely for the natural environment, and this kind of work requires a lot of investment and time-consuming. The restored site lacks sustainable utilizati...

Claims

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Application Information

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IPC IPC(8): B09C1/00A01G17/00A01G20/00A01G22/00
CPCB09C1/00B09C1/105A01G17/005A01G22/00A01G20/00
Inventor 徐恒吴博涵陈鹏梁珂彭鹤彭顶华罗焕颜徐绯
Owner SICHUAN UNIV
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