Pre-impregnation approach to encapsulate radioactive liquid organic waste in geopolymer
Eros Mossini, Andrea Santi, Gabriele Magugliani, Francesco Galluccio, Elena Macerata, Marco Giola, Dhanalakshmi Vadivel, Daniele Dondi, Davide Cori, Paolo Lotti, G. Diego Gatta, Mario Mariani
Abstract
The pre-disposal management of Radioactive Liquid Organic Waste (RLOW) is hampered by its challenging physico-chemical properties. In this work, a straightforward conditioning option based on RLOW impregnation on absorbing materials and followed by encapsulation in a stable geopolymeric matrix is proposed, avoiding onerous pre-treatments and the use of surfactants. Recycled materials have been investigated as adsorbent and geopolymer precursors to foster process sustainability. Relevant properties have been studied to ascertain the waste acceptance criteria accomplishment: materials compatibility, RLOW loading factor and bleeding, microstructure, compressive strength, leaching and thermal stability. This approach is promising, although some criticalities remain unsolved.