Method for improving vegetation containing lead tailing sand

A technology of tailings sand and vegetation, applied in the field of phytoremediation, can solve the problems of small biomass, slow growth and limited application of Southeast Sedum, and achieve the effect of improving the ability to absorb heavy metal lead, strong adaptability and strong tolerance

Inactive Publication Date: 2012-09-12
JIANGSU SHANSHUI ENVIRONMENT CONSTR GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the biomass of Sedum sedum is small and its growth is slow, which greatly limits its application in the vegetation improvement of lead tailings sand.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The content of lead in the soil of a lead tailings sand area is 528mg / kg. In the flat plot of the lead tailings sand area, planting holes are built with a depth of 40cm, a plant spacing of 60cm, and a row spacing of 100cm; The ratio of mass ratio is 2:1:0.1 and the improvement agent is mixed and applied to the planting hole; Plant Leucaena in the planting hole; Harvest the aerial part of the Leucaena plant once after 4 months, the stubble height is 40cm; Will harvest The aboveground part of the mine was dried and crushed, and the lead content of the aboveground part was measured to be 852 mg / kg, and then the lead was recycled; the lead content in the soil of the mining area was reduced from 528 mg / kg to 483 mg / kg. The content of lead in the soil was reduced by 8.5%. After harvesting every 4 months, the stubble height is 40cm each time, and the lead content in the soil is continuously reduced. After 6 harvests, the lead content in the soil drops to the normal level (≤100...

Embodiment 2

[0023] The content of lead in the soil of a lead tailings sand area is 1120mg / kg. In the flat plot of the lead tailings sand area, planting holes are built with a depth of 50cm, a plant spacing of 70cm, and a row spacing of 150cm; The ratio of mass ratio is 2:1:0.1 and the improvement agent is mixed and applied to the planting hole; plant Leucaena in the planting hole; harvest the aerial part of the Leucaena plant once after 4 months, and the stubble height is 30cm; The aboveground part of the mine was dried and pulverized, and the lead content of the aboveground part was measured to be 965 mg / kg, and then the lead was recycled; the lead content in the soil of the mining area was reduced from 1125 mg / kg to 1002 mg / kg. The content of lead in the soil was reduced by 10.9%. Harvest once every 4 months, each time the stubble height is 30cm, the lead content in the soil will continue to decrease, after 10 harvests, the lead content in the soil will drop to the normal level (≤100 mg...

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PUM

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Abstract

The invention discloses a method for improving vegetation containing lead tailing sand. White popinac is planted in soil containing the lead tailing sand in a direct transplantation manner, survives and grows to a harvesting seedling stage, and is processed together. The method includes (1) flattening a sample plot and punching planting holes; (2) mixing montmorillonite, chicken manure and straw to prepare a modifier, and filling the modifier into the planting holes; (3), planting the white popinac in the planting holes; and (4) periodically harvesting overground parts of the white popinac and processing the harvested overground parts of the white popinac together. The mass ratio of the montmorillonite to the chicken manure to the straw is 2:1:0.1. The method is wide in application range and remarkable in effect, the content of lead in the lead tailing sand is effectively reduced, and purposes of repairing and improving the lead tailing sand are achieved.

Description

technical field [0001] The invention relates to a method for improving vegetation of lead tailing sand, which belongs to the field of phytoremediation. Background technique [0002] Lead tailings are widely distributed in my country. Tailings, also known as tailings, are particulate solid powders left after the ore has been crushed, flotation-centred and concentrated. Due to the small particle size, light weight and large surface area of ​​the tailings, it is easy to cause flow and collapse when stacked, and damage vegetation; the tailings dust is driven by the wind and flies around, causing air and soil pollution, land degradation, desertification, and salinization. The ecosystem is degraded, biodiversity is lost, crop production is reduced, and it threatens human health; a large number of loose tailings are prone to landslides and mudslides under the action of seasonal rainfall, posing a huge threat to nearby villages, towns, farmland, and water sources. Lead tailings con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00
Inventor 陈卫连姚锁平蔡婕张静姚岗
Owner JIANGSU SHANSHUI ENVIRONMENT CONSTR GRP
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