Method for preventing and controlling heavy-metal movement of uranium tailings slag using plants

A technology of tailings slag and heavy metals, applied in the field of phytoremediation, can solve the problems of high accumulation and immobilization, and achieve the effects of fast growth, favorable plant growth, and reduced migration

Inactive Publication Date: 2009-07-29
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The roots of many plants often only have a high accumulation and fixation effect on one or

Method used

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  • Method for preventing and controlling heavy-metal movement of uranium tailings slag using plants
  • Method for preventing and controlling heavy-metal movement of uranium tailings slag using plants
  • Method for preventing and controlling heavy-metal movement of uranium tailings slag using plants

Examples

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Example Embodiment

[0028] Example 1

[0029] Plant materials: Pouzolzia zeylanica, Melilotusoffivinalis, Rhus chinensis, Trema orientalis, and Buddleja officinalis.

[0030] Other materials: grass charcoal and phosphate fertilizer.

[0031] The mixed matrix of grass charcoal and phosphate fertilizer is prepared according to the weight ratio: grass charcoal 92%, phosphate fertilizer 8%. In the uranium tailings contaminated area, the planting holes are arranged in a straight line. The size of the planting holes is 40cm in length, 30cm in width, and 30cm in depth; the long axis direction of the planting holes is the same as the direction of the rows of cultivated plants. Each plant hole is filled with 500g of a mixed matrix of grass charcoal and phosphate fertilizer. The three plant seedlings of S. sylvestris, S. sylvestris and Denstrum are cultivated in the first row by interplanting. The distance between two adjacent planting holes in this row is 100cm, and only one plant is planted in each planting ...

Example Embodiment

[0036] Example 2

[0037] Plant materials: Pouzolzia zeylanica, Melilotusoffivinalis, Rhus chinensis, Trema orientalis and Buddleja officinalis.

[0038] Other materials: grass charcoal and phosphate fertilizer.

[0039] First, the mixed matrix of grass charcoal and phosphate fertilizer is prepared according to the weight ratio: grass charcoal 98%, phosphate fertilizer 2%. In the uranium tailings contaminated area, the planting holes are arranged in a straight line. The size of the planting holes is: length 60cm, width 40cm, and depth 50cm; the long axis direction of the planting holes is the same as the direction of the rows of cultivated plants. Apply 750g of a mixed matrix of grass charcoal and phosphate fertilizer to each plant hole. The seedlings of three plants, S. sylvestris, Serratia vulgaris, and Dendrogram, are cultivated in the first row by interplanting. The distance between two adjacent planting holes in this row is 100cm, and only one plant is planted in each plantin...

Example Embodiment

[0044] Example 3:

[0045] Plant materials: Pouzolzia zeylanica, Melilotusoffivinalis, Rhus chinensis, Trema orientalis and Buddleja officinalis.

[0046] Other materials: grass charcoal and phosphate fertilizer.

[0047] First, the mixed matrix of grass charcoal and phosphate fertilizer is prepared according to the weight ratio: grass charcoal 95%, phosphate fertilizer 5%. In the uranium tailings contaminated area, the planting holes are arranged in a straight line. The size of the planting holes is: length 50cm, width 35cm, and depth 40cm; the long axis direction of the planting holes is the same as the direction of the rows of cultivated plants. 600g of mixed matrix of grass charcoal and phosphate fertilizer was applied to each plant hole. The seedlings of three plants, S. sylvestris, Serratia vulgaris, and Dendrogram, are cultivated in the first row by interplanting. The distance between two adjacent planting holes in this row is 100cm, and only one plant is planted in each pl...

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Abstract

The invention relates to a method for preventing and controlling migration of heavy metal pollutants in uranium tailings by plants. Five plants, namely Rhus chinensis, Trema orientalis, Buddleja officinalis, Melilotus officinalis and Pouzolzia zeylanica which have strong drought resistance and can retain different heavy metals are planted in a matching way, and applied with plant carbon and phosphate fertilizer at the same time so as to establish vegetation in a uranium tailings polluting area in a short time. Through reestablishment of the vegetation, the nitrogen content of the polluted soil is obviously increased, and the contents of the water-soluble heavy metals such as uranium are obviously reduced. The plants selected by the method are all planted locally, so the materials are easily taken, and the plants are easily planted and quickly grown; moreover, the method has the advantages of having good efficiency for controlling pollution, improving the soil, beautifying the environment, and the like. The method can be used for controlling heavy metal pollution and reestablishing vegetation of various mine degraded ecosystems.

Description

technical field [0001] The invention relates to a method for phytoremediation of polluted soil, in particular to a method for using plants to prevent and control the migration of heavy metal pollutants in uranium tailings slag. Background technique [0002] The prevention and control of heavy metal pollution is a hot and difficult issue in international restoration ecology and environmental science research. my country has a large stockpile of uranium tailings and covers a large area, and the stockpiling area is close to the village. Due to the high heavy metal content, poor nutrition and weak water holding capacity of uranium tailings slag, the vegetation in the area where uranium tailings slag is stored is lacking, soil erosion is serious, and heavy metals diffuse with rainwater and dust, causing harm to the surrounding environment and the health of residents. Treatment and control of uranium tailings slag pollution meet the requirements of national sustainable developmen...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/10C05G1/00C05F11/02
Inventor 向言词冯涛曾荣今许中坚严明理彭秀花
Owner HUNAN UNIV OF SCI & TECH
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