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Method for restoring lead contaminated soil by utilizing eremochloa ophiuroides

A technology of lead-contaminated soil and fake thrifty grass, applied in the field of environmental governance, can solve the problem of low enrichment capacity and achieve good soil-fixing effect and good landscape effect

Inactive Publication Date: 2006-07-26
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

[0006] Heavy metal hyperaccumulator plants are the key to the success of phytoremediation technology for contaminated soil. Yang Yuee et al. invented a method for remediating lead-contaminated soil with Sedum alfredii Hance (Chinese invention patent, application number: 200410015651.4), but due to The aboveground part of Sedum sedum plant has a low ability to accumulate lead in soil. Under the soil lead pollution level of 200-6011mg / kg, the lead content of the aboveground part of Sedum sedum is only about 210-230mg / kg. The lead pollutants removed are only 194-480g / ha

Method used

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  • Method for restoring lead contaminated soil by utilizing eremochloa ophiuroides

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Embodiment 1

[0019] On the soil with extremely high levels of lead pollution, the turf direct paving method is used to plant the turf grass. The turf is taken from the mature turf lawn that has grown for two years. The turf contains underground rhizomes with a thickness of about 2 cm. On the lead-contaminated soil, use a compactor to compact the turf after paving, so that the turf is in close contact with the subsoil, and water once perviously, so that the soil water content reaches more than 90% of the maximum water holding capacity in the field. After 2 days, the turf can resume normal growth, and after 6 days, the turf can reach normal quality. In the first month, when the height of the lawn reaches more than 10cm, start pruning. From the second month, the dry matter output of the stems and leaves of the aboveground part of the grass can reach more than 2000kg / ha, and the lead concentration is 3834mg / kg On the soil, the lead content in the stems and leaves of Pseudomonas is 10468mg / kg, ...

Embodiment 2

[0021] On the soil with different levels of lead pollution, use the grass stem propagation method to plant the grass stem. The grass stems are cut into 5-8cm long stems, and they are directly sprinkled on the flat soil surface. The grass stem density is 500 per square meter. Around the grass stem section, cover the grass stem with about 2cm thick fine soil. After lightly patting it with a farm tool, pour water once, and the soil moisture content reaches more than 90% of the maximum water holding capacity in the field. After 5 days, there will be false thrift grass sprouts from the soil, and after one month, it will grow into a false thrift grass lawn. When the height of the lawn reaches 10cm or more, it can be pruned. From the third month, the dry matter output of the stems and leaves of the aboveground part of the grass can reach more than 1560kg / ha. The enrichment of lead in the stems and leaves of the grass and the case 1, on the polluted soil with a lead concentration of 3...

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Abstract

The invention relates the method of repairing lead pollution soil with jiajian grass. The root and rhizome of the glass largely absorbs the lead in soil, and the lead is changed in the glass and finally reaches the haulm of the glass. Then the haulm is cut and innocently treated. So the lead is removed. The glass has strong ability to absorb the lead, and the lead content of overground part is up to 10000mg / kg. Every mouth 16.1-25.3 kg / ha lead is removed from soil. Besides, the glass possesses the advantages of restoring soil and decorating environment.

Description

technical field [0001] The invention relates to a method for repairing lead-contaminated soil by using C. chinensis, which uses the C. spp. plant with extremely high lead enrichment efficiency to carry out in-situ repairing of heavy metal lead-contaminated soil, and belongs to the field of environmental management. Background technique [0002] Lead is one of the most prevalent heavy metal pollutants in the environment. Excessive intake of lead by the human body will damage the nervous system, hematopoietic organs and kidneys. Common symptoms are loss of appetite, headache, insomnia, muscle pain, gastroenteritis, anemia, etc. In severe cases, shock or even death may occur. According to incomplete statistics, more than 10% of urban children in my country have blood lead levels exceeding the standard, which poses a huge threat to the national health of our country. [0003] Lead pollution mainly comes from the production and use of lead-containing products. Worldwide, milli...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/10
Inventor 王兆龙朱燕华李洁刘一明
Owner SHANGHAI JIAO TONG UNIV
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