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Renovation method for plant in soil of zinc-cadmium combined pollution

A technology for compound pollution and phytoremediation, which is applied in the field of soil remediation using plants and can solve problems such as remediation of zinc and cadmium compound polluted soil.

Inactive Publication Date: 2009-07-29
INST OF SOIL SCI CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Because Sedum sedum is a newly discovered plant species, there is no technical report on using this plant to remediate polymetallic contaminated soil at home and abroad, and there is no technical report on using this plant to remediate zinc-cadmium composite contaminated soil

Method used

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  • Renovation method for plant in soil of zinc-cadmium combined pollution
  • Renovation method for plant in soil of zinc-cadmium combined pollution
  • Renovation method for plant in soil of zinc-cadmium combined pollution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Sedum sedum is a perennial herb that mainly reproduces asexually. Select twigs from healthy mature seedlings, cut them in nutrient solution or seedling medium, or directly cut them in soil, and transplant them to contaminated soil after a large number of adventitious roots grow from the base of the young shoots. It is transplanted in March or April every year. When the environmental conditions are suitable, the growth rate of sedum sedum is fast and can form a good ground cover. The aboveground part can be harvested after 3 to 4 months of growth. Restricted by environmental conditions, Sedum sedum grows slowly, and resumes rapid growth after the high temperature period in summer. Therefore, after the first harvest, the second harvest can be done at an interval of 4-5 months, and the time is around November each year. After harvesting in the second season, it enters the winter low temperature period, and the growth of Sedum sedum grows again slows down or even stagnates...

Embodiment 2

[0021] Contrast experiment of planting Sedum sedum alone and interplanting Elsholtzia splendens Nakai ex F.Maekawa.

[0022] a. In the polluted field with soil Zn and Cd contents of 1374±44mg / kg and 3.60±0.10mg / kg respectively, plant Sedum sedum with ore alone, its annual biomass is 5-6 tons / ha, and the aboveground Zn and Cd content The concentrations were 5306±552 mg / kg and 78.7±6.3 mg / kg.

[0023] b. Under the conditions of the comparative experiment, the planting ratio of Sedum haizhou and Sedum sedatus is about 1:1. Contrast experiments showed that after interplanting Sedum haizhou, the biomass of Sedum sedum and the concentration of Zn and Cd in the aboveground parts could be significantly increased, the annual biomass of Sedum sedum could increase by 38.3-53.1%, and the enrichment concentrations of Zn and Cd increased respectively. 30.6-59.1% and 5.72-46.1%.

[0024] Therefore, the extraction efficiency of Zn and Cd can be increased by 61.9-120% after interplanting Sed...

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Abstract

A phytoremediation method for zinc-cadmium composite polluted soil is characterized in that the sedum with ore is cultivated in the zinc-cadmium composite contaminated soil area to be treated, and the harvested sedum with ore is harvested and transferred every year. In order to achieve the purpose of efficient management, in terms of cultivation and management, it can be harvested twice a year in July and November; it can also be used as an intercropping of Sedum sedum and Haizhou Sedum.

Description

1. Technical field [0001] The invention belongs to the regeneration technology of polluted soil in the field of agricultural soil, in particular to a technology of using plants for soil restoration. 2. Background technology [0002] Soil pollution is a global environmental problem, especially in developing countries. As an important part of environmental elements, the protection and sustainable use of soil resources is particularly important for a country with a population of 1.3 billion, rapid socio-economic development and a fragile ecological environment. However, whether in our country or abroad, the deterioration of the ecological environment and health threats caused by soil pollution are not slowing down but intensifying. According to the Bulletin on the State of the Environment in China in 2000: "Sampling and monitoring of harmful heavy metals in the soil of 300,000 hectares of basic farmland protection areas, of which 36,000 hectares of soil heavy metals exceeded t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00B09C1/10
Inventor 吴龙华李娜毕德骆永明蒋玉根
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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