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Method for remedying heavy metal cadmium contamination in soil

A technology for remediating soil and heavy metals is applied in the field of remediating soil heavy metal cadmium pollution, which can solve the problems of high material cost and low space utilization rate, and achieve the effects of simple operation, good shading effect and great economic value.

Inactive Publication Date: 2018-09-21
HUNAN YONKER ENVIRONMENTAL PROTECTION RES INST
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Problems solved by technology

[0004] As a hyperaccumulator of cadmium, Sedum sedum has the characteristics of large biomass and fast growth. However, because sedum plants need to be treated with sunshade when cutting in summer, the traditional method of covering with shading nets is not suitable for large-scale The cost of materials required for cultivation and management is relatively high, and the space utilization rate is not high

Method used

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  • Method for remedying heavy metal cadmium contamination in soil
  • Method for remedying heavy metal cadmium contamination in soil
  • Method for remedying heavy metal cadmium contamination in soil

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Embodiment Construction

[0030] The experimental area is located in a fallow area in Liling City, Hunan Province, which has a subtropical monsoon climate. The annual average temperature is about 18°C, the annual average frost-free period is about 288 days, the annual average sunshine is 1500-1910 hours, and the annual average precipitation is between 1300-1600 mm. The surface soil (0-20cm soil layer) of the fallow area is collected as a sample of 10 mu, and the five-point sampling method is used to mix it into a soil sample. The position (latitude and longitude) of each sampling point is marked, and its basic physical and chemical properties are determined as follows: The soil type belongs to yellow brown soil, with pH value of 5.4, organic matter of 21.12g / kg, total phosphorus of 0.58g / kg, total nitrogen of 1.14g / kg, and total cadmium of 1.07mg / kg.

[0031] Soil preparation was carried out 15 days before planting. The plowing depth is more than 18cm, and the slabs are dried for 1 day. The soil clods...

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Abstract

The invention discloses a method for remedying heavy metal cadmium contamination in soil. The method comprises the following steps: planting sedum plumbizincicola and helianthus annuus in cadmium-contaminated soil in an intercropping form; absorbing and enriching heavy metal cadmium by the sedum plumbizincicola and the helianthus annuus to remove cadmium from the soil. The intercropping helianthusannuus provides a good shading effect for growth of the sedum plumbizincicola, so that the input cost is reduced and the problem of safe survival of the sedum plumbizincicola in summer is effectivelyalleviated; a technical model is easy to operate, economical and practical, and is easily accepted by agricultural producers.

Description

technical field [0001] The invention relates to a method for remediating heavy metal cadmium pollution in soil, in particular to the field of remediation of heavy metal polluted soil. Background technique [0002] Soil heavy metal pollution is one of the most prominent environmental problems today. According to the "National Soil Pollution Survey Bulletin" published by the Ministry of Environmental Protection and the Ministry of Land and Resources in April 2014, heavy metal cadmium has become one of the most important inorganic pollutants in my country's polluted soil. Heavy metals accumulate in living organisms through the food chain, thus causing serious harm to food safety and human health. Among the current mainstream soil heavy metal remediation technologies, phytoremediation technology can fundamentally reduce soil cadmium content through absorption, volatilization, root filtration, degradation, stabilization, etc., and has obvious advantages such as green, safety, an...

Claims

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Application Information

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IPC IPC(8): B09C1/00
CPCB09C1/105B09C2101/00
Inventor 殷志遥刘代欢和君强邓林常海伟秦华桂娟
Owner HUNAN YONKER ENVIRONMENTAL PROTECTION RES INST
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