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Application of ditch millets in repairing heavy metal copper pollution of mine soil in Karst mountain areas

A technology of heavy metal and copper pollution, which is applied in the repair of heavy metal copper pollution in the soil of karst mountainous mining areas, and in the field of phytoremediation, can solve the problems of difficult selection of hyperaccumulator plants, and achieve easy engineering implementation, strong adaptability, and high growth potential. and scalable effects

Inactive Publication Date: 2015-04-01
GUIZHOU NORMAL UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Screening of Cu hyperaccumulator plants is difficult

Method used

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  • Application of ditch millets in repairing heavy metal copper pollution of mine soil in Karst mountain areas
  • Application of ditch millets in repairing heavy metal copper pollution of mine soil in Karst mountain areas
  • Application of ditch millets in repairing heavy metal copper pollution of mine soil in Karst mountain areas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The experimental site is the copper-contaminated soil around the Yinhe Coal Mine Wasteland in Hongguo Town, Pan County, Liupanshui City, Guizhou Province. The litter and soil seed banks were taken from the surrounding forest. The pH value of the soil in the Yinhe Coal Mine sample plot in Hongguo Town, Pan County, ranges from 3.04 to 5.04, which is strongly acidic, and the copper ion content in the soil is 65.86 mg·kg -1 , exceeding the secondary standard of 50 mg·kg in the soil environmental governance standard (GB15618-1995) -1 , reached the standard of copper pollution.

[0036] The experiment was divided into seven groups. The experiment started in October. The experimental site was divided into 1m*1m squares, covered with litter respectively, with a thickness of 0cm, 2cm, 2-4cm, 4-6cm, 6-8, 8-10cm , 10-12cm, repeat five times for each thickness. Then sow the paspalum seeds.

[0037] Water every three days after sowing, and stop artificial watering after two week...

Embodiment 2

[0048] The experimental site is the copper-contaminated soil around the abandoned coal mine in Maiping Township, Huaxi District, Guiyang City, Guizhou Province, and the experimental process is the same as in Example 1. The experimental results show that paspalum has hyperaccumulation ability to soil copper pollution. Among them, the average value of copper content absorbed by the aerial parts of paspalum was 1223.412mg·kg -1 . The enrichment factor reaches 1.1-2.4. One year after the restoration experiment in the experimental plot, the vegetation coverage increased from 0% before restoration to an average of 30%, and the Shannon-Winer diversity index of the experimental plot increased from 0 to 0.7.

[0049] This study suggests that paspalum has a strong remediation potential for copper-contaminated soil and is a hyperaccumulator plant for copper-contaminated soil treatment. Before sowing, it is more beneficial to cover the polluted soil with surrounding forest litter and s...

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Abstract

The invention relates to the technical field of plant repairing to heavy metal pollution in environment, and in particular relates to a repairing technology for heavy metal copper pollution in mine soil of Karst mountain areas, specifically the application of ditch millets in repairing heavy metal copper pollution of the mine soil in the Karst mountain areas. The application method comprises the following steps of: covering 2-4cm of surrounding forest litters and soil seed banks in the soil polluted by copper at first, then sowing the ditch millets, harvesting and ashing the ditch millets periodically, and thus repairing the soil polluted by the heavy metal copper. Because the ditch millets are strong in salt and alkali resistance, adaptability, growth potential and expansibility and are resistant to trampling, so that the ditch millets are particularly suitable for piecemeal thinning of soil stratum and mining areas with strong acidity in the Karst mountain areas, can improve the greening level of the areas at the same time, are simple to sow and manage, and facilitate engineering implementation.

Description

technical field [0001] The invention relates to the technical field of phytoremediation of heavy metal pollution in the environment, in particular to the technical field of remediation of soil polluted by heavy metal copper in karst mountain mining areas, specifically the application of paspalum in repairing soil heavy metal copper pollution in karst mountain mining areas. Background technique [0002] A series of ecological and environmental problems caused by the development of mineral resources in the west - the destruction of surface vegetation and soil, land desertification, and pollution of surface water have made the local ecosystem more fragile, with reduced biodiversity and serious ecological reverse succession. [0003] The adoption of phytoremediation technology is a feasible method in line with the natural and economic conditions of the karst mountain mining area in Guizhou. Among them, for phytoremediation, finding suitable hyperaccumulator plants, suitable tole...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00
Inventor 龙健
Owner GUIZHOU NORMAL UNIVERSITY
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