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Method for rehabilitating uranium contaminated soil by use of functional plant community

A plant community and uranium pollution technology, applied in the field of uranium-contaminated soil phytoremediation, can solve the problems of being susceptible to pests and diseases, monotonous plant species, and high maintenance costs, and achieve the effects of increasing environmental risks, large biomass, and easy management.

Active Publication Date: 2014-01-22
NANHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, phytoremediation technologies at home and abroad all use a single enrichment or hyper-accumulation plant to remediate uranium-contaminated soil, which has monotonous plant species, poor stability, easy degradation, high maintenance cost, easy to be attacked by diseases and insect pests, and low ecological function. and other shortcomings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Plant seeds: mulberry ( Broussonetia papyrifera ) seeds, wolfberry ( Ilex cornuta ) seeds, reeds ( Phragmites australis ) seeds, fern ( Pteris cretica ) seeds, heteromorphic sedge ( Cyperus difforis ) seeds.

[0039] Other materials: farmyard manure, uranium-contaminated soil.

[0040] Seeds were soaked in concentrated sulfuric acid for 10-15 minutes, washed with water to remove sulfuric acid, and then air-dried naturally. According to the ratio of 300 grains of heteromorphous sedge, 280 grains of reed, 50 grains of Pteris fern, 48 grains of Lycidium chinensis, and 22 grains of mulberry per square meter, all seeds were evenly mixed to obtain mixed seeds. According to the ratio of 5 kg of farmyard manure per square meter and 150 kg of uranium-contaminated soil with a uranium content of 5 mg / kg, mix evenly to obtain a soil matrix mixture. The obtained soil matrix mixture is evenly mixed with the mixed seeds to obtain the seed soil matrix mixture. Sow the ob...

Embodiment 2

[0045] Plant seeds: mulberry ( Broussonetia papyrifera ) seeds, wolfberry ( Ilex cornuta ) seeds, reeds ( Phragmites australis ) seeds, fern ( Pteris cretica ) seeds, heteromorphic sedge ( Cyperus difforis ) seeds.

[0046] Other materials: farmyard manure, uranium-contaminated soil.

[0047] The seeds of the above five plants were soaked in water at 60°C for 3 h, and then air-dried naturally. According to the ratio of 260 grains of heteromorphic sedge, 200 grains of reed, 70 grains of Pteris fern, 50 grains of Lyricus chinensis, and 25 grains of mulberry per square meter, all the seeds were evenly mixed to obtain mixed seeds. Mix evenly at the ratio of 5 kg of farmyard manure per square meter and 150 kg of uranium-contaminated soil with a uranium content of 10 mg / kg to obtain a soil matrix mixture. The obtained soil matrix mixture is evenly mixed with the mixed seeds to obtain the seed soil matrix mixture. Sow the obtained seed soil matrix mixture on the uraniu...

Embodiment 3

[0052] Plant seeds: mulberry ( Broussonetia papyrifera ) seeds, wolfberry ( Ilex cornuta ) seeds, reeds ( Phragmites australis ) seeds, fern ( Pteris cretica ) seeds, heteromorphic sedge ( Cyperus difforis ) seeds.

[0053]Other materials: farmyard manure, uranium-contaminated soil.

[0054] After the seeds were treated with 25 mg / L naphthaleneacetic acid for 2-3 h, they were air-dried naturally. According to the ratio of 350 grains of heteromorphous sedge, 300 grains of reed, 80 grains of fern, 60 grains of Chinese wolfberry, and 25 grains of mulberry per square meter, all seeds were mixed evenly to obtain mixed seeds. Mix evenly at the ratio of 5 kg of farmyard manure per square meter and 150 kg of uranium-contaminated soil with a uranium content of 20 mg / kg to obtain a soil matrix mixture. The obtained soil matrix mixture is evenly mixed with the mixed seeds to obtain the seed soil matrix mixture. Sow the obtained seed soil matrix mixture on the uranium-contami...

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Abstract

The invention relates to a method for rehabilitating uranium contaminated soil by use of a functional plant community. According to the method, broussonetia papyrifera and Ilex cornuta, and reed, Pteris multifida Poir and difformed galingale herb (herbaceous plants), which can enrich uranium in the soil are selected to construct a stable plant community with a function of in-situ repairing for uranium contaminated soil, wherein all plants in the plant community can enrich uranium in the uranium contaminated soil and can transport the uranium into an overground part of the plants, thereby achieving the purpose of rehabilitating the uranium contaminated soil. The method comprises the following steps of firstly, performing seed treatment and sowing; secondly, trimming and fertilizing; thirdly, harvesting; and fourthly, treating in a concentrating manner. The method does not need other auxiliary means and is capable of overcoming the disadvantages that the plant species structure is simple, the plant community is instable and easy to degrade, the maintenance cost is high, the plant diseases and insect pests are more and the ecological functions are at a low level when the single plant species is used for repairing the uranium contaminated soil in an existing method, the five plants have synergistic effect, and the repairing efficiency is improved remarkably compared with that of the method adopting the single plant species for rehabilitating the uranium contaminated soil.

Description

technical field [0001] The invention belongs to the technical field of uranium-contaminated soil phytoremediation, and in particular relates to a technology for remediating uranium-contaminated soil by using functional plant communities. Background technique [0002] According to the analysis of radioactive pollution sources in my country's uranium mining and metallurgy system in the "Thirty Years of Radiation Environmental Quality Evaluation", uranium waste rock and uranium tailings are the largest sources of radioactive pollution in uranium mining and metallurgy systems. There are more than 180 uranium waste rocks and uranium tailings stacking sites in China, distributed in more than 30 counties and cities in 14 provinces and regions across the country, with the characteristics of large stockpiling, wide area, and close to villages and towns; about 80% of them are Uranium waste rocks and 90% of uranium tailings are distributed in Hunan, Jiangxi and Guangdong, where there i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/10
Inventor 丁德馨胡南李广悦郑青文胡劲松彭国文王永东
Owner NANHUA UNIV
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