Encapsulation and embedding

Encapsulation of waste, on the other hand, is achieved by physically surrounding the waste with or in a material (typically considered a flowable material such as a grout or cement) so the waste particles are isolated and radionuclides are retained. Encapsulation may or may not include some chemical incorporation if the encapsulating phase reacts with the waste, i. e. if hydrating calcium-silicate-hydrates (CSH) incorporate waste species during hydration. The IAEA definition [12] of encapsulation is ‘immobilization of dispersed solids (e. g., ash or powder) by mixing with a matrix material in order to produce a waste form,’ but also includes emplacement of a solid waste form (e. g., spent fuel assemblies) in a container.

Embedding is the immobilization of solid waste (e. g., metallic materials) by surrounding it with a matrix material in order to produce a waste form. Embedding is similar to encapsulation when no chemical interaction is observed between the waste and the encapsulation medium (typically bitumen or polymers).

Добавить комментарий

Ваш e-mail не будет опубликован. Обязательные поля помечены *