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Plants repairing method based on uranium tail SLAG pollution

A technology for contaminated soil and phytoremediation, which is applied in the field of phytoremediation based on uranium tailings polluted soil, can solve problems such as hazards, and achieve the effects of low environmental risk, simple management, and reduction of uranium entering groundwater.

Inactive Publication Date: 2008-08-27
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few reports on phytoremediation of uranium tailings and its surrounding contaminated areas.
Foreign studies have found that sunflower (Helianthus annuus) and Indian mustard (Brassica Juncea) absorb and accumulate the most uranium, and uranium is mainly accumulated in the roots of plants, and the uranium accumulated in the roots is up to 6200mg.kg -1 , the uranium accumulated in the aboveground part is up to 102mg.kg -1 ; and these two uranium-enriching plants are related to human food, there is a risk of uranium passing through the food chain and causing harm to humans, which requires the screening of new uranium-enriching plants

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Example 1, Pokeweed seeds were treated with concentrated sulfuric acid for 7-15 minutes, then rinsed with tap water, and seedlings were grown by sand culture. The uranium tailings slag, forest surface soil and pig manure are mixed as the cultivation substrate, and the substrate is potted. Transplant pokeweed seedlings with a seedling age of 70 days into pots and carefully manage them. When flowering branches grow, remove the flowering branches to promote vegetative growth; harvest the above part of pokeweed 4 months after transplanting. After analysis and determination, when the dry weight ratio of uranium tailings slag, forest surface soil and pig manure is 6: 2.5: 0.5, the biomass (dry weight) of harvested American commercial land is 103g.plant -1 , the uranium content is 81mg.kg -1 , take away uranium 8.3mg.plant from the contaminated matrix -1 ; When the ratio of uranium tailings slag, forest topsoil and pig manure dry weight was 8: 1.5: 0.5, the aboveground part ...

Embodiment 2

[0053] Example 2, Pokeweed seeds were treated with concentrated sulfuric acid for 7-15 minutes, then rinsed with tap water, and seedlings were grown by sand culture. Mix uranium tailings slag, forest surface soil and pig manure at a dry weight ratio of 8:1.5:0.5 as a cultivation substrate, put in pots, add different concentrations of sodium silicate to the substrate, and grow Pokeweed seedlings up to 60 days old. Transplant it into a pot and carefully manage it. When the flowering branches grow, remove the flowering branches to promote vegetative growth. Harvest the pokeweed above 4 months after transplanting. Determined by analysis, when adding 150mg.kg -1 When sodium silicate is used, the biomass (dry weight) of the harvested Pokemon aboveground is 81g.plant -1 , the uranium content is 91mg.kg -1 , take away uranium 7.4mg.plant from the contaminated matrix -1 ; When adding 200mg.kg -1 When sodium silicate is used, the aboveground part biomass (dry weight) of harvested Po...

Embodiment 3

[0054] Example 3, Pokeweed seeds were treated with concentrated sulfuric acid for 7-15 minutes, then rinsed with tap water, and seedlings were grown by sand culture. Mix uranium tailings slag, forest surface soil and pig manure according to the dry weight ratio of 8:1.5:0.5, and add 250mg.kg of sodium silicate to the mixed matrix -1 . When the seedlings reach 80 days old, they are transplanted into the above-mentioned pots. Careful management, when the flowering branches grow, remove the flowering branches to promote vegetative growth. From October to November in the first year, harvest the aboveground part of Pokeland, and the average biomass of the aboveground part is 87g.plant -1 , the uranium content in the aboveground part is 84mg.kg -1 , uranium 7.3 mg.plant is taken away from the contaminated matrix when harvesting the above-ground parts -1 ; In October-November of the second year, the aboveground part of pokeland was harvested, and the average biomass of the aboveg...

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Abstract

A phytoremediation method based on soil contaminated by uranium tailings comprises the steps for culturing pokeberry seedlings on a substrate containing uranium tailings, surviving, growing, harvesting and centrally processing. The method comprises the following steps of: (1) mixing soil contaminated by uranium tailings, surface oil of forest and pig manure according to a ratio to obtain a culture substrate; (2) adding sodium silicate in the culture substrate; (3) sterilizing seeds; and (4) potting. By adopting the comprehensive processing scheme combined with the pokeberry, the uranium tailings, the surface oil of forest, the pig manure and the sodium silicate, the method can solve the difficult problem that the environment can be endangered by heavy metal, uranium, which is released by uranium tailings under natural condition. The method has the advantages of convenient operation and management, high remedying efficiency, low cost, low environment risk, environment beautification, etc., and is suitable for processing solid-state uranium waste storage fields such as uranium mines, hydrometallurgy plants and waste ore and tailings reservoirs.

Description

technical field [0001] The invention relates to a phytoremediation method for polluted soil, in particular to a phytoremediation method based on uranium tailings slag polluted soil. Background technique [0002] my country's uranium mines and water smelters are distributed in dozens of counties in more than a dozen provinces and regions across the country. There are more than 150 solid waste storage sites such as waste ores and tailings ponds, about 80% of which are waste rocks and 92% of tailings. The mines are distributed in densely populated Hunan, Jiangxi, and Guangdong, and there are many rivers in these areas. my country's uranium tailings have important characteristics such as large stockpiles and a large area, and the tailings area is close to the village. Uranium tailings and tailings contain uranium and other radioactive pollutants. Uranium is mainly a source of α-rays. In addition to radiation effects, the chemical behavior and physiological toxicity of uranium a...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/10
Inventor 冯涛向言词曾荣今刘炳荣许中坚严明理易俗
Owner HUNAN UNIV OF SCI & TECH
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