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Remediation method for remediating heavy metal contaminated soil around mining area through plant intercropping

A remediation method and a technology for polluted soil, applied in the field of phytoremediation, can solve problems such as the decrease of the biomass of sedum associated with mines, poor drainage in the field, and the reduction of heavy metal remediation efficiency

Pending Publication Date: 2021-03-02
江苏萤火虫环境科技有限公司 +2
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

In summer, the temperature rise in southern China, abundant rainfall and poor drainage in the field lead to root rot of Sedum sedum, which leads to a decrease in the biomass of Sedum sedum and a decrease in the recovery efficiency of heavy metals.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Take a farmland polluted with cadmium and zinc in Renhua County, Guangdong Province, the soil pH value is 5.8, and the concentration of total soil Cd is 4.12mgkg -1 , Zn is 639 mg kg -1 ; Effective Cd 0.549mg kg -1 、Zn 41.1mg kg -1 . In March 2019, an example was transplanted between Sedum sedum and Osmanthus fragrans:

[0021] Land selection and preparation: plow, harrow and level the selected land and apply compound fertilizer. After the base fertilizer is applied, the ridges are artificially raised with a ridge width of 90 cm, a ridge distance of 40 cm, and a ridge height of more than 20 cm, and finally covered with black plastic film for use.

[0022] Transplanting: After the plastic film is covered, use wooden sticks and other tools to punch holes in the plastic film for cuttings of Sedum sedum seedlings and red-backed osmanthus seedlings. Drill 4 columns on each ridge, the row spacing is controlled at 15-25cm, and the plant spacing is also controlled at 15-20...

Embodiment 2

[0027] Taking a cadmium-contaminated cultivated land in Renhua County, Guangdong Province as the experimental area, the soil pH value was 7.15, and the total soil Cd concentration was 4.04 mg kg -1 , Zn is 1171mg kg -1 . An example of transplanting between Sedum sedum and Scherichia safflower in March 2019:

[0028] Land selection and preparation: plow, harrow and level the selected land and apply compound fertilizer. After the base fertilizer is applied, the ridges are manually raised with a ridge width of 100 cm, a ridge distance of 45 cm, and a ridge height of more than 25 cm, and finally covered with black plastic film for use.

[0029] Transplanting: After the mulch is covered, use sticks and other tools to punch holes in the mulch for cuttings of Sedum sedum seedlings and Scherichia scherichia seedlings. Drill 4 columns on each ridge, the row spacing is controlled at 15-25cm, and the plant spacing is also controlled at 15-20cm. After the mulch is perforated, water ac...

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PUM

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Abstract

The invention relates to a remediation method for remediating heavy metal contaminated soil around a mining area through plant intercropping, which comprises the following steps of planting hyperaccumulator and ornamental plants in heavy metal contaminated cultivated land soil according to the natural growth period in an intercropping manner, conducting conventional cultivation, continuously transplanting the hyperaccumulator to expand the remediation area in the harvesting period, andtransplanting the ornamental plants as economic plants after being cultivated. According to the ecological restoration mode, one year serves as a restoration period, hyperaccumulator plants are planted in one season or multiple seasons, ornamental plants are intercropped, and the restoration efficiency of thecontaminated farmland soil can be improved through simultaneous restoration operation of the hyperaccumulator plants and the ornamental plants; meanwhile, the polluted cultivated land is used as an economic plant seedling raising area, considerable economic value is obtained, and an ecological restoration mode of restoring while producing is achieved.

Description

technical field [0001] The invention relates to the technical field of phytoremediation, in particular to a method for remediating heavy metal-contaminated soil around a mining area by plant intercropping. Background technique [0002] At present, soil heavy metal pollution has become a global environmental problem. In recent years, farmland heavy metal pollution has posed a serious threat to the quality of agricultural products, the safety of the agricultural ecological environment, modern agriculture, and sustainable socio-economic development. Efficient, safe, and scientific restoration techniques and method systems can effectively curb agricultural environmental pollution and the growing trend of development. Among the many heavy metal-contaminated soil remediation methods, phytoremediation has shown its great advantages in remediation technology because of its low cost, no damage to the soil structure, and no secondary pollution. However, it takes a long time to remedi...

Claims

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Application Information

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IPC IPC(8): B09C1/10A01B79/02A01G17/00A01G2/10
CPCB09C1/105A01B79/02A01G17/005A01G2/10B09C2101/00
Inventor 毕德孙曦关元静葛延妍吴龙华李希冉许明
Owner 江苏萤火虫环境科技有限公司
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