Investigation, development and assessment of innovative direct conditioning solutions for radioactive liquid organic waste within the Predis project

Federica Pancotti, Mafalda Guerra, Maxime Fournier, Kahina Hamadache, Abdelaziz Hasnaoui, Crina Bucur, Evamaria Marquez, Lara Esperanza, Martin Hayes, John Provis, Yevhenii Svitlychnyi, Sergey Sayenko, Davide Cori, Eros Mossini, Andrea Santi, Quoc Tri Phung, Thi Nhan Nguyen

Research outputpeer-review

Abstract

In the framework of the Horizon-2020 PRE-DISposal management of radioactive waste (PREDIS) project, research activities are on-going to address the key issue of Radioactive Liquid Organic Waste (RLOW), which consists in the lack of reliable disposal or treatment routes, by investigating, developing and assessing direct conditioning solutions based on geopolymers and alkali-activated materials as conditioning matrices. Such solutions have to lead to final waste forms exhibiting properties and performances compatible with safety and technical requirements related to disposal, as well as to prolonged storage and transport. During the first two and half years of the project, several formulations have been tested for the incorporation of specific types of RLOW. The study of the direct conditioning process targeted an incorporation rate (Waste Loading) up to 30%-40% by volume of the different RLOW types. Following an initial screening phase, three reference formulations, based on metakaolin, fly ash, blast furnace slags and mixes of raw materials, were identified as the most promising in terms of improving waste loadings and the properties of the waste forms. The reference formulations were tested and optimised in terms of choice and quantity of aluminosilicate precursors, alkaline activators, possible blended binder systems and additives facilitating the organic waste emulsification (surfactants), to achieve waste forms with good rheological and mechanical properties. The robustness of the formulations was assessed with reference to waste, raw materials, and process variability. After a qualitative screening, based on a predefined set of criteria, a limited number of formulations were selected to further consolidate the reference formulations by testing them with real RLOW and to investigate the feasibility of scale-up by exploratory pilot scale tests planned for the last year of the project.
Original languageEnglish
Title of host publicationProceedings of ASME 2023 International Conference on Environmental Remediation and Radioactive Waste Management, ICEM 2023
Place of PublicationStuttgart, Germany
PublisherASME - The American Society of Mechanical Engineers
Number of pages4
EditionICEM2023
ISBN (Electronic)9780791887530
DOIs
StatePublished - 3 Oct 2023
Event2023 - ICEM: International Conference on Environmental Remediation and Radioactive Waste Management - International Conference Centre Stuttgart, Stuttgart
Duration: 3 Oct 20236 Oct 2023
https://event.asme.org/ICEM

Publication series

NameProceedings of ASME 2023 International Conference on Environmental Remediation and Radioactive Waste Management, ICEM 2023

Conference

Conference2023 - ICEM
Country/TerritoryGermany
CityStuttgart
Period2023-10-032023-10-06
Internet address

ASJC Scopus subject areas

  • Waste Management and Disposal
  • Environmental Engineering

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