Direct conditioning of liquid organic radioactive waste into a geopolymer matrix

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F26722445%3A_____%2F24%3AN0000117" target="_blank" >RIV/26722445:_____/24:N0000117 - isvavai.cz</a>

Result on the web

<a href="https://www.djs.si/upload/nene/2023/proceedings/Contribution_515_final.pdf" target="_blank" >https://www.djs.si/upload/nene/2023/proceedings/Contribution_515_final.pdf</a>

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Direct conditioning of liquid organic radioactive waste into a geopolymer matrix

Original language description

The management and disposal of liquid organic radioactive waste pose significant challenges due to their hazardous nature and long-term environmental impacts. Conventional methods, such as incineration and solvent extraction, often result in secondary waste streams or generate harmful emissions. To address these issues, we investigate a novel approach for directly conditioning the liquid organic radioactive waste into a geopolymer matrix. A series of experimental tests were conducted to evaluate the feasibility and effectiveness of the direct conditioning method. Engine oil was used as a simulated organic radioactive waste and mixed with blast-furnace slag, alkali activators, and other additives to form a homogeneous geopolymer mixture. The mixture was then cured under controlled conditions, allowing the formation of a hardened geopolymer matrix incorporating the liquid organic radioactive waste. Various techniques, including UV/Vis spectroscopy, X-Ray Diffraction (XRD), microscopy and compressive strength tests, were employed to characterise the physical, chemical, and mechanical properties of the resulting geopolymer waste forms. Compressive strength tests demonstrated that the geopolymer waste forms exhibited satisfactory mechanical performance, suggesting their potential suitability for long-term storage and disposal of liquid organic radioactive waste. Furthermore, leaching experiments were conducted to assess the leachability of oil and selected elements from the conditioned waste form. The results revealed very low oil leaching, indicating high immobilisation efficiency. Overall, this study demonstrates the successful direct conditioning of liquid organic radioactive waste into a geopolymer matrix using blast furnace slag alkali-activated binder. The results highlight the potential of this approach as a sustainable and effective solution for the immobilisation and safe disposal of liquid organic radioactive waste streams. Further research and optimisation are necessary to expand the application of this technique to other liquid organic waste types and evaluate its long-term performance under various environmental conditions.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

20401 - Chemical engineering (plants, products)

Project

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Continuities

R - Projekt Ramcoveho programu EK

Publication year

2024

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

NENE 2023 : 32nd International Conference Nuclear Energy for New Europe : proceedings : September 11-14, Portorož, Slovenia

ISBN

978-961-6207-56-0

ISSN

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e-ISSN

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Number of pages

12

Pages from-to

1-12

Publisher name

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Place of publication

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Event location

Portorož, Slovenia

Event date

Sep 11, 2024

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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