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Method of restoring 226Ra contaminated soil by functional plant communities

A technology for polluted soil and plant communities, applied in the field of phytoremediation, can solve the problems of monotonous structure of a single plant species, unstable plant community, low ecological function, etc., and achieve the effects of increasing environmental risks, easy management, and strong drought resistance.

Active Publication Date: 2014-09-10
NANHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the phytoremediation technologies at home and abroad all use a single enrichment or hyperaccumulation plant pair 226 Restoration of Ra-contaminated soil has the disadvantages of monotonous structure of single plant species, unstable plant community, easy degradation, high maintenance cost, rampant pests and diseases, and low ecological function.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Plant seeds: Saltwood ( Rhus chinensis ) seeds, daqing ( Clerodendrum cyrtopyllum ) seeds, paspalum seeds ( Paspalum scrobiculatum ), fern ( Pteridium aquilinum ) seeds, clubhead grass ( Polypogon fugax )seed.

[0040] Other materials: farmyard manure, 226 Ra pollutes the soil.

[0041] 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 200 paspalum seeds per square meter, 150 fern seeds, 80 clubhead seeds, 30 daqing seeds, and 20 saltwood seeds, all the seeds were mixed evenly to obtain mixed seeds. According to 5 kg of farm fertilizer per square meter, 226 Ra content of 0.5 Bq / g 226 120 kg of Ra-contaminated soil was mixed 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 obtained seed-soil matrix mixture around a uranium tailings...

Embodiment 2

[0046] Plant seeds: Saltwood ( Rhus chinensis ) seeds, daqing ( Clerodendrum cyrtopyllum ) seeds, paspalum seeds ( Paspalum scrobiculatum ), fern ( Pteridium aquilinum ) seeds, clubhead grass ( Polypogon fugax )seed.

[0047] Other materials: farmyard manure, 226 Ra pollutes the soil.

[0048] 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 300 paspalum seeds per square meter, 200 fern seeds, 90 clubhead seeds, 40 daqing seeds, and 20 saltwood seeds, all the seeds were mixed evenly to obtain mixed seeds. According to 5 kg of farm fertilizer per square meter, 226 Ra content of 1.0 Bq / g 226 120 kg of Ra-contaminated soil was mixed 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 obtained seed-soil matrix mixture around a uranium tailings pond in southern my country 226 Ra...

Embodiment 3

[0053] Plant seeds: Saltwood ( Rhus chinensis ) seeds, daqing ( Clerodendrum cyrtopyllum ) seeds, paspalum seeds ( Paspalum scrobiculatum ), fern ( Pteridium aquilinum ) seeds, clubhead grass ( Polypogon fugax )seed.

[0054] Other materials: farmyard manure, 226 Ra pollutes the soil.

[0055] 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 paspalum seeds per square meter, 300 fern seeds, 100 clubhead seeds, 50 daqing seeds, and 25 saltwood seeds, all the seeds were mixed evenly to obtain mixed seeds. According to 5 kg of farm fertilizer per square meter, 226 Ra content of 2.0 Bq / g 226 Mix 150 kg of Ra-contaminated soil 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 obtained seed-soil matrix mixture around a uranium tailings pond in southern my country 226 ...

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Abstract

The invention relates to a method of restoring 226Ra contaminated soil by functional plant communities. The method includes: using arbor Chinese sumac, shrub Clerodendrum cyrtophyllum and herbaceous plants, herbaceous plant, Pteridium aquilinum and Polypogon fugax, which are all capable of enriching 226Ra in soil, to build a stable plant community which functions in restoring 226Ra contaminated soil in situ. Various plants in the plant community enrich the 226Ra in the 226Ra contaminated soil and convey the 226Ra to overground parts of the plants to restore the 226Ra contaminated soil. The method includes the steps of 1, treating and sowing seeds; 2, trimming and applying fertilizers; 3, harvesting; 4, treating centrally. The method has the advantages that the defects that the existing method of restoring 226Ra contaminated soil by single plants uses single type of plants, plant communities are instable and easily degradable, maintenance cost is high, diseases and pests are wild and biological function is poor are overcome, the five types of plants are synergistic, and the method has significantly improved restoration effect as compared to the method of restoring 226Ra contaminated soil by single plants.

Description

technical field [0001] The invention belongs to 226 The technical field of phytoremediation of Ra-contaminated soil, specifically relates to a method of utilizing functional plant community remediation 226 Ra-contaminated soil techniques. Background technique [0002] According to the "Thirty Years Radiation Environmental Quality Assessment", the collective dose of radionuclides exposed to the surrounding public by the uranium mining and metallurgy system accounts for about 91.5% of the total collective dose of the nuclear fuel system, and uranium waste rock and uranium tailings are the largest components of the uranium mining and metallurgy system. radioactive source. According to statistics, the accumulated uranium waste rock in the world has exceeded 40 billion tons, and the uranium tailings have exceeded 20 billion tons. There are more than 180 dumping sites for solid waste such as waste ore and uranium tailings in China, which are distributed in more than 30 counties...

Claims

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Application Information

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