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

A technology for tailings slag and heavy metals, applied in the field of phytoremediation, can solve the problems of high accumulation and fixation, and achieve the effects of fast growth, increased drought resistance, and reduced fertilizer loss

Inactive Publication Date: 2010-10-06
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 a few heavy metals, and a single plant can only fix and control one or a few heavy metals

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

Experimental program
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Effect test

Embodiment 1

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

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

[0031] First prepare grass charcoal and phosphate fertilizer mixed matrix according to weight ratio: grass charcoal 92%, phosphate fertilizer 8%. In the uranium tailings slag contaminated area, the planting holes are arranged in a straight line. The size of the planting holes is: 40cm long, 30cm wide, and 30cm deep; the long axis direction of the planting holes is the same as the row of cultivated plants. Fill grass charcoal and phosphate fertilizer mixed substrate 500g in each plant hole. Plant the seedlings of the three kinds of plants, Saltwort, C. jute and Budisma, in the first row by interplanting. The distance between two adjacent planting holes in this row is 100 cm, and only one kind of plant is planted in each planting hole. , the number of seedlings in each planting hole is...

Embodiment 2

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

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

[0039] First prepare grass charcoal and phosphate fertilizer mixed matrix according to weight ratio: grass charcoal 98%, phosphate fertilizer 2%. In the uranium tailings slag contaminated area, the planting holes are arranged in a straight line. The size of the planting holes is: 60cm long, 40cm wide, and 50cm deep; the long axis direction of the planting holes is the same as the row of cultivated plants. Fill grass charcoal and phosphate fertilizer mixed substrate 750g in each plant hole. Plant the seedlings of the three kinds of plants, Saltwort, C. jute and Budisma, in the first row by interplanting. The distance between two adjacent planting holes in this row is 100 cm, and only one kind of plant is planted in each planting hole. , the number of seedlings in each planting hole is...

Embodiment 3

[0045] Plant material: Pouzolzia zeylanica, Melilotus officinalis, Rhus chinensis, Trema orientalls and Buddleja officinalis.

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

[0047] First prepare grass charcoal and phosphate fertilizer mixed matrix according to weight ratio: grass charcoal 95%, phosphate fertilizer 5%. In the uranium tailings slag contaminated area, the planting holes are arranged in a straight line. The size of the planting holes is: length 50cm, width 35cm, depth 40cm; the direction of the long axis of the planting holes is the same as the direction of the rows of cultivated plants. Fill grass charcoal and phosphate fertilizer mixed substrate 600g in each plant hole. Plant the seedlings of three kinds of plants, Saltwort, S. jute and Budisma, in the first row by interplanting. The distance between two adjacent planting holes in this row is 100cm, and only one kind of plant is planted in each planting hole. , the number of seedlings in e...

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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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Patent Type & Authority Patents(China)
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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