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Restoration method of soil polluted by radionuclide Cs-137

A radionuclide, cs-137 technology, applied in the field of soil remediation, can solve the problems of low efficiency, poor treatment effect, and poor effect, and achieve the effect of clean process, low operating cost and simple equipment

Active Publication Date: 2015-06-10
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

The ex-situ treatment method is used to solve the problems of poor treatment effect of the original in-situ treatment method, poor effect of individual physical, chemical or biological methods, and low efficiency.

Method used

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  • Restoration method of soil polluted by radionuclide Cs-137

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with accompanying drawing.

[0027] like figure 1 Shown, a kind of remediation method of the soil polluted by radionuclide Cs-137, comprises the steps:

[0028] (1) For the soil contaminated by radionuclide Cs-137, take the 3-7cm soil on the surface, crush and sieve 2, the sieve mesh hole is 5-10mm, remove stones and gravel, and prepare for subsequent treatment;

[0029] (2) The soil obtained after crushing and sieving is put into the physical leaching reactor 4 for leaching, and the soil is fully mixed with the eluent by mechanical stirring. The eluent is deionized water, and the water-to-soil mass ratio is 3- Add deionization to the physical washing reactor at 5:1, first stir at a speed of 10-15rpm for 5-10min, and then stir at a speed of 25-35rpm for 10-20min; realize the separation of water and pollutants through activated carbon adsorption and high-temperature oxidation, The purified and regener...

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Abstract

The invention discloses a restoration method of soil polluted by radionuclide Cs-137, and belongs to the field of environmental protection. The method comprises following steps: 1, soil extraction, crushing, and sieving; 2, physical leaching; 3, multi-stage separation and filtration; 4, chemical leaching; and 5, soil particle recovery, dehydration, pH adjustment and soil backfilling. A deionized water and ultrasonic wave combination technology is adopted in the physical leaching stage, so the decontamination percentage reaches 66%. The decontamination percentage of chemical leaching reaches 80%, and the total decontamination percentage reaches 93%, and is greatly higher than the decontamination efficiency of traditional methods. The method disclosed in the invention has the advantages of easy realization, clean process, simple device, good safety and low running cost.

Description

technical field [0001] The invention belongs to the field of environmental protection and relates to a repair method for soil polluted by radionuclide Cs-137. Background technique [0002] In my country, due to the development of nuclear industry and the wide application of nuclear technology in the fields of industry, agriculture, energy, military, transportation, medical and health, radionuclide pollution has become one of the important environmental problems that are difficult to control today. After radionuclides enter the soil, they can accumulate in the soil, transfer harmful substances to plants (food crops, fruit trees, vegetables), and enter the human body through the food chain, thereby endangering human health. In addition to causing serious harm to human health through the food chain, it also makes it difficult for people to remove these nuclides, especially in large areas in the soil, and their removal is even more difficult. [0003] Radioactive cesium is an i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/08
Inventor 张一梅聂宇陆骏卢宏玮何理
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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