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Method for repairing soil contaminated by uranium tailings uranium and associated heavy metal by passivation of phosphorous-containing compounds

A technology for polluted soil and heavy metals, applied in the field of bioremediation of polluted soil, can solve the problems of waste rock loss, ecological safety, harm to people's life and social stability, surrounding farmland, water source environmental pollution, etc., and achieve good returns.

Inactive Publication Date: 2019-01-15
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, there are a small amount of uranium minerals mixed in the waste rocks to continuously release 222Rn. In addition, most of the uranium tailings in my country are close to river basins. As artificial loose piles with high potential energy, the waste rocks are lost under the action of rainwater erosion, etc. It will inevitably cause environmental pollution such as surrounding farmland and water sources, directly endanger the production and life of local residents, and will also cause panic among local residents, causing harm to ecological security, people's lives, and social stability.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] In the first step, the phosphorus-containing compound is selected from nano-hydroxyphosphate rock powder.

[0013] The second step, passivation treatment of uranium and associated heavy metals in soil contaminated by uranium tailings, according to the soil 3g / m 2 Weigh the phosphorus-containing compound, and then pre-mix it evenly according to the ratio of phosphorus-containing compound: organic matter of 1:50, spread it on the soil surface and plow it in the soil.

[0014] The third step is to screen and utilize potatoes that are tolerant to uranium and associated heavy metals, have a small amount of enrichment, and are mainly enriched in the roots, and cultivate them according to the potato planting requirements, so that they can be harvested in areas polluted with low concentrations of uranium and associated heavy metals. agricultural products and obtain better returns.

Embodiment 2

[0016] In the first step, calcium superphosphate and potassium dihydrogen phosphate are screened for phosphorus-containing compounds.

[0017] The second step, passivation treatment of uranium and associated heavy metals in soil contaminated by uranium tailings, according to the soil 9g / m 2 The amount of phosphorus-containing compound is weighed, and then pre-mixed according to the ratio of phosphorus-containing compound: organic matter is 1:100, and then sprinkled on the soil surface and plowed in the soil.

[0018] The third step is to screen and utilize sweet potatoes and corn combinations that are tolerant to uranium and associated heavy metals, have a small enrichment amount, and are mainly enriched in the roots, and cultivate them according to the planting requirements of sweet potatoes and corn, so that uranium and associated heavy metals can be produced at low concentrations of uranium and associated heavy metals. Harvest agricultural products that are safe to eat in p...

Embodiment 3

[0020] In the first step, the phosphorus-containing compound is selected from a combination of superphosphate and nano-hydroxyphosphate rock powder.

[0021] The second step, passivation treatment of uranium and associated heavy metals in soil contaminated by uranium tailings, according to the soil 5g / m 2 The amount of phosphorus-containing compound is weighed, and then pre-mixed according to the ratio of phosphorus-containing compound: organic matter is 1:70, and then sprinkled on the soil surface and plowed in the soil.

[0022] The third step is to screen and use the combination of onions and soybeans that are tolerant to uranium and associated heavy metals, have a small enrichment amount, and are mainly enriched in the roots, and cultivate them according to the planting requirements of onions and soybeans, so that the low concentration of uranium and associated heavy metals can be obtained. Harvest agricultural products that are safe to eat in polluted areas and obtain bet...

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Abstract

The invention discloses a method for repairing soil contaminated by uranium tailings uranium and associated heavy metal by passivation of phosphorous-containing compounds. The method for repairing thesoil contaminated by uranium tailings uranium and associated heavy metal by passivation of the phosphorous-containing compounds comprises the steps that step one, phosphorous-containing compounds screening is carried out; step two, uranium tailings contaminated soil uranium and associated heavy metal passivation treatment is carried out; and step three, plants with uranium and associated heavy metal tolerance, small amount of enrichment and mainly enrichment in roots are screened and utilized, the plants are cultivated according to various varieties planting requirements, contents of a uranium and associated heavy metal effective state in uranium and associated heavy metal low concentration contaminated areas can be reduced, and agricultural products with edible safety are harvested and better earnings are obtained.

Description

technical field [0001] The invention relates to the technical field of bioremediation of contaminated soil, in particular to the passivation and restoration of uranium tailings uranium and associated heavy metal contaminated soil by phosphorus compounds. It is suitable for the comprehensive treatment of radioactive and heavy metal double polluted soil such as uranium tailings, uranium waste rock sites and decommissioned areas of uranium mines. Background technique [0002] With the rapid development of the world economy, environmental protection and the continuous depletion of fossil energy, the development and utilization of large-scale nuclear energy has become an inevitable choice. The ever-accelerated exploration and mining of uranium resources has produced a large number of uranium tailings and uranium waste ore heaps. The lack of vegetation coverage in the uranium tailings stockpiling area causes water and soil erosion and dust, which diffuses uranium and associated h...

Claims

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Application Information

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IPC IPC(8): B09C1/08B09C1/10
CPCB09C1/08B09C1/105B09C2101/00
Inventor 罗学刚唐永金
Owner SOUTHWEAT UNIV OF SCI & TECH
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