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Application of Trifolium repens in remediation of heavy metal contaminated soil

A technology for polluted soil and white clover, applied in the field of environmental pollution control, can solve problems such as difficulty in meeting actual needs of plant resources, and achieve the effects of good composite control effect, easy cultivation and considerable enrichment.

Active Publication Date: 2013-06-19
浙江博世华环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the plant resources currently available for the remediation of copper, cadmium, and lead-contaminated soil are difficult to meet the actual needs, and further research and expansion of available resources are urgently needed

Method used

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  • Application of Trifolium repens in remediation of heavy metal contaminated soil
  • Application of Trifolium repens in remediation of heavy metal contaminated soil
  • Application of Trifolium repens in remediation of heavy metal contaminated soil

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Effect test

Embodiment 1

[0024] The test site is located in Zhejiang Gongshang University, Hangzhou City, Zhejiang Province, China, with geographic coordinates at 120°7' east longitude and 30°17' north latitude.

[0025] The polluted soil was taken from the area where electronic products have been stacked for a long time in Wenling, and it is mainly soil polluted by copper, cadmium, and lead heavy metals. Put the polluted soil into pots, the size of the pots is 20 (diameter) cm×17 (height) cm, 2.5 kg per pot. After determination, the heavy metal contents of copper, cadmium and lead in the tested soil were 69.6mg / kg, 1.16mg / kg and 81.3mg / kg respectively.

[0026] The first cycle of planting: on September 16, 2009, white clover was directly sown in the soil to be tested, 30 seeds were sown in each pot, and the emergence rate was about 85%. The non-polluted soil was used as a control (CK). At the seedling stage, add water in time to keep the soil humidity at 60-85%. When the true leaves of the seedling...

Embodiment 2

[0045] The test site is located in Tongshan Village, Wenqiao, Wenling City, Zhejiang Province, China. The geographical location is 28°38′ north latitude and 121°27′ east longitude, which is a dense area of ​​small dismantling sites for solid waste. The main land use type of the plot is farmland, where rice and vegetables are mainly grown, and the surrounding area is residential buildings. The test results found that the main pollutants in the surface soil of this block are heavy metals, mainly copper, cadmium, and lead, which pose a great threat to the safety of local agricultural products. According to the restoration standards, the restoration targets for copper, cadmium, and lead are 50mg / kg, 0.3mg / kg, and 50mg / kg, respectively.

[0046] At the end of September 2010, white clover was planted. Soak the purchased white clover seeds in clean water for 24 hours, sprinkle them into the well-leveled soil at a density of 0.5 grams per square meter, and cover with a thin layer of s...

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Abstract

The invention discloses an application of Trifolium repens in remediation of heavy metal contaminated soil, comprising planting Tifolium repens in the remediation of heavy metal contaminated soil; when Tifolium repens plants grow to the initial flowering stage, carrying out a first clipping on the above-ground portion of the plants; when the plants continue growing to the adult stage and the early bud stage, carrying out a second clipping on the above-ground portion of the plants; when the plants continue growing to the full flowering stage, removing the whole plants; wherein the heavy metal is one or more of copper, cadmium and lead. According to the invention, the Tifolium repens plants are planted in the heavy metal contaminated soil, the Tifolium repens can absorb and accumulate the heavy metal in the soil during the growing process, through harvesting the above-ground portion at fixed period and harvesting the underground portion at fixed period and repeating the planting a few times, the purpose of reducing the heavy metal content in the soil can be achieved, thus the remediation of the heavy metal contaminated soil is realized. The method has the advantages of simple operation and good remediation effect, and is easy to popularize.

Description

technical field [0001] The invention relates to the technical field of environmental pollution control, in particular to the application of white clover in repairing heavy metal polluted soil. Background technique [0002] With the rapid development of economic globalization, heavy metal pollution in the global land is becoming more and more serious. Industrial "three wastes" and motor vehicle exhaust emissions, sewage irrigation and abuse of pesticides and fertilizers have caused serious environmental and heavy metal pollution. The use of heavy metal-enriched plants for soil remediation is one of the research hotspots in environmental science today. Heavy metals in soil are biodegradable and relatively stable. Therefore, using plants to remediate heavy metal-contaminated sites is a solution to the problem of heavy metal pollution in the environment. A promising option of , it has shown great potential in remediating heavy metal soil pollution, and it has many characteristi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00B09C1/10
Inventor 陈昆柏况武田伟莉
Owner 浙江博世华环保科技有限公司
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