Novel method for evaluating potential of soil contaminated by phytoremediation radionuclide

A radionuclide and phytoremediation technology, applied in the restoration of polluted soil, etc., can solve the problem of not considering plant biomass and so on

Active Publication Date: 2015-07-01
NANHUA UNIV
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Problems solved by technology

Since the previous evaluation index bioconcentration and bioconcentration factor did not consider the factor of plant biomass, it is urgent to consider the three factors that affect phytoremediation, plant bio

Method used

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  • Novel method for evaluating potential of soil contaminated by phytoremediation radionuclide
  • Novel method for evaluating potential of soil contaminated by phytoremediation radionuclide
  • Novel method for evaluating potential of soil contaminated by phytoremediation radionuclide

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Experimental program
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Effect test

Embodiment approach

[0026] Select the sampling site, collect the dominant plants growing in the radionuclide-contaminated soil, and collect 6 plants for each plant; use polybutene sleeves, 30.5 cm in length, and 5 cm in diameter at the sampling points corresponding to plant growth. S-shaped stainless steel drilling tool to collect soil samples. The collected plant samples were first washed with tap water on the soil attached to the surface of their leaves and roots, and then washed with deionized water to separate the roots, stems, leaves, flowers, and fruits. After natural air-drying for 2 weeks, dry in an oven at 105 °C for 24 h, and then weigh the stems, leaves and fruits with an electronic balance after constant mass. The stems, leaves and fruits of the plants dried to a constant mass were crushed with a plant grinder, and passed through a 63 μm nylon sieve before being tested. For the collected radionuclide-contaminated soil samples, after removing plant residues and gravel, the soil at...

Embodiment 1

[0034] Phytoremediation coefficient (1).

[0035] Table 1 Phytoremediation coefficients of 16 plants in radionuclide-contaminated soil of a uranium tailings pond and its surrounding areas to U

[0036]

Embodiment 2

[0038] Collect 16 kinds of dominant plants and soil samples in the radionuclide-contaminated soil of a certain uranium tailings pool and surrounding areas, and measure the biomass of the aboveground parts of the plants, the Th concentration of the aboveground parts and the corresponding Th concentration in the soil, and According to formula (1), the phytoremediation coefficient of each plant to Th in radionuclide-contaminated soil was calculated, as shown in Table 2, according to the calculated phytoremediation coefficient, Macleaya cordata The restoration coefficient of Th in radionuclide-contaminated soil is the highest, which is 9.98. Therefore, among the 16 kinds of plants collected Macleaya cordata It has good remediation potential for Th in radionuclide-contaminated soil.

[0039] Phytoremediation coefficient (1).

[0040] Table 2 Phytoremediation coefficients of 16 plants in radionuclide-contaminated soil of a uranium tailings pond and its surrounding areas to Th...

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Abstract

The invention relates to a novel method for evaluating the potential of soil contaminated by phytoremediation radionuclide. The phytoremediation coefficient is defined as the product of the above-ground biomass of plants and the concentration of the radionuclide divided by the concentration of the radionuclide in soil; the potential of soil contaminated by the phytoremediation radionuclide is evaluated by the phytoremediation coefficient. The method comprehensively considers the three factors including the above-ground biomass of plants, the concentration of above-ground radionuclide of plants and the concentration of radionuclide in the contaminated soil, and is reasonable in evaluating the potential of the soil contaminated by phytoremediation radionuclide. Compared with the existing evaluation method, the novel method has the advantages of simplicity, intuition and reasonable result.

Description

technical field [0001] The invention relates to the remediation of radionuclide-contaminated soil, in particular to the phytoremediation of radionuclide-contaminated soil. Background technique [0002] With the rapid development of national defense and nuclear power in our country, the demand for natural uranium is increasing day by day, which requires increasing the scale of uranium mining and smelting, which makes more and more soil polluted by radionuclides. Radionuclide-contaminated soil has the characteristics of low radionuclide concentration, large area, and large treatment volume. Although physical and chemical methods such as alien soil method, in-situ covering method, solidification method, stabilization method, electrodynamic repair method, soil leaching method, and chelating agent leaching method can be used, good results can be achieved, but the treatment cost is high. , It is easy to cause secondary pollution, and it needs to use special equipment and professi...

Claims

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Application Information

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IPC IPC(8): B09C1/00
Inventor 丁德馨胡南赵维超李乐李广悦王永东胡劲松李昌武
Owner NANHUA UNIV
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