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Cadmium-contaminated soil remediation method

A technology of cadmium-contaminated soil and remediation method, applied in the restoration of polluted soil, etc., can solve the problems of poor benefit and high implementation cost, and achieve the effects of improving survival rate, low input cost, and alleviating the difficulty of summer

Inactive Publication Date: 2018-12-21
HUNAN YONKER ENVIRONMENTAL PROTECTION RES INST
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  • Application Information

AI Technical Summary

Problems solved by technology

Although the traditional method of adding sunshade nets can alleviate the problem of safe summer with mine sedum to a certain extent, the implementation cost of large-scale projects is relatively high and the benefits are poor.

Method used

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  • Cadmium-contaminated soil remediation method
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  • Cadmium-contaminated soil remediation method

Examples

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Effect test

Embodiment 1

[0059] Embodiment 1: intercropping and interplanting of Sedum sedum with ore

[0060] In March 2017, land consolidation was carried out on the field plots with an area of ​​1 mu in the test unit C, and the specifications were the same as those in Comparative Example 1 and Comparative Example 2. according to figure 1 The planting mode shown is planting Sedum sedum (25000 plants / mu) and ghost needle grass (6250 plants / mu), and the cultivation field management and harvesting methods are the same as above. Do not cover with shade nets. After the test, collect and test the soil and plant cadmium content as required, measure the yield of the sample, and record the changes in plant growth and survival rate. Under the intercropping mode of Sedum sedum and Sedum sedum intercropping, the total amount of cadmium removed by two crops of sedum sedum was 41.99g, and the annual average cadmium removal rate was 32.93%. After remediation, the cadmium content in the soil was 0.69mg / kg, and t...

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Abstract

The invention relates to a cadmium-contaminated soil remediation method. According to the cadmium-contaminated soil remediation method, a cadmium hyperaccumulator, namely sedum plumbizincicola, is planted in soil contaminated by heavy metal cadmium through a ridge-planting cuttage method, and an annual medicinal herbaceous cadmium hyperaccumulator, namely sticktight, is planted around the sedum plumbizincicola through intercropping; and the two hyperaccumulators are reasonably inter-planted to form upper and lower inter-planting structures of two crops by fully using the physiological differences of the two hyperaccumulators in height, light richness, shade tolerance, root depth and the like as well as the differences in growth season and space in the growing process, a good shading effectis achieved for the sedum plumbizincicola, and a combined remediation effect is achieved. By adoption of the cadmium-contaminated soil remediation method, the sedum plumbizincicola can safely grow insummer, the remediation effect is improved, and certain economic value is achieved. The cadmium-contaminated soil remediation method is high in space utilization rate, reliable in remediation effect,easy and convenient to operate, economical, environmentally friendly, good in application prospect and particularly suitable for remediating farmland soil contaminated by heavy metal cadmium to different degrees.

Description

technical field [0001] The invention relates to a method for repairing cadmium-contaminated soil, and belongs to the technical field of phytoremediation of soil heavy metal pollution. Background technique [0002] Cadmium has strong biological toxicity, is active in the environment, and is easy to accumulate and endanger human health through the food chain. It is one of the most threatening heavy metal elements to the environment and human health. In recent years, the area of ​​Cd-contaminated soil in my country has been increasing. In the 2014 National Soil Pollution Survey, cadmium was at the top of the list of soil pollution, and the pollution degree was cadmium>lead>zinc. Cd has obvious health risks to the human body, and it is easy to accumulate in organisms through the food chain, and eventually be absorbed by the human body to cause damage. [0003] The main technologies for remediation of heavy metal pollution in soil include physical remediation, chemical re...

Claims

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Application Information

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IPC IPC(8): B09C1/00
CPCB09C1/105B09C2101/00
Inventor 和君强刘代欢邓林常海伟秦华殷志遥
Owner HUNAN YONKER ENVIRONMENTAL PROTECTION RES INST
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