Functional modular plutonium contaminated soil ex-situ leaching decontamination method

Abstract

The invention discloses a functional modular plutonium contaminated soil ex-situ leaching decontamination method. According to the invention, a contaminated soil particle size grading and analysis module, a contaminated soil screening and volume reduction pretreatment module, a contaminated soil grading leaching decontamination module and a waste liquid treatment and recycling module are included. According to the method, on the basis of particle size grading and analysis of the contaminated soil, mass volume reduction of the contaminated soil and reduction of comprehensive decontamination cost are preliminarily achieved through screening pretreatment, grading leaching decontamination is conducted on the remaining part, the content of plutonium-239 in the contaminated soil is reduced to 3700 Bq/kg or below 100 Bq/kg, then waste liquid generated in the leaching process is treated, and exempt emission or reuse of the waste liquid is achieved. Compared with the prior art, the process is constructed in a function modularization mode, optimization of subsequent core technical parameters and construction of matched technical equipment are guided, all modules can be disassembled, matched and integrated according to specific requirements, and then the flexibility of process operation is improved.

Description

technical field [0001] The invention relates to the technical field of radioactive waste treatment and disposal, in particular to a method for ex-situ leaching and decontamination of plutonium-contaminated soil with modular functions. Background technique [0002] The treatment / disposal of radioactive pollutants has become a bottleneck issue in the peaceful use of nuclear energy and the development of nuclear technology. The decontamination / remediation of radioactively contaminated soil has attracted the attention of governments and the public, and is a research hotspot in the field of nuclear environmental science. The production of nuclear weapons, the operation of nuclear reactors, and sudden nuclear accidents produce a large amount of plutonium-containing radioactive pollutants, which are the main sources of global or regional soil radioactive pollution. The high toxicity and long half-life of plutonium isotopes lead to the long-term existence of its potential environmen...

AI Technical Summary

Problems solved by technology

In-situ chemical leaching is carried out directly on the polluted site without excavating a large amount of soil, which is beneficial to personnel protection and is suitable for hydraulic conductivity greater than 10 -3 cm / s porous and easily permeable soil, such as sandy soil, gravel soil, alluvial soil and coastal soil, has the advantages of low cost and easy operation, but the disadvantage is that the operating conditions are not easy to control, and the decontamination effect and continuous restoration cannot be predicted time, it may also cause groundwater pollution, etc.

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