A functional modular method for ex-situ leaching and decontamination of plutonium-contaminated soil

Abstract

The invention discloses a functional modular plutonium-contaminated soil ectopic leaching and decontamination method, comprising a soil particle size classification and analysis module, a pre-treatment module for soil screening and capacity reduction, a soil grading, leaching and decontamination module, a waste Four modules including liquid treatment and reuse module. This method is based on the particle size classification and analysis of polluted soil, and first preliminarily realizes volume reduction of contaminated soil through pre-screening treatment to reduce the cost of comprehensive decontamination, and then decontaminates the remaining part by graded leaching to remove the plutonium in the contaminated soil. 239 content is reduced to 3700Bq / kg or below 100Bq / kg, and then the waste liquid generated in the washing process is treated to realize its exemption from discharge or reuse. Compared with the existing technology, constructing the process in a functional modular way is not only conducive to guiding the optimization of subsequent core technical parameters and the construction of supporting technical equipment, but also dismantling, collocation and integration of each module according to specific needs, and then Increased flexibility in process operations.

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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