ENVIRONMENTAL ASSESSMENT OF CARBON CAPTURE AND UTILIZATION: A NEW SYSTEMIC VISION – APPLICATION TO VALORIZATION OF NICKEL SLAGS

Author(s): A. VENTURA, N. ANTHEAUME
Paper category: Proceedings
Book title: CO2STO2019 - International Workshop CO2 Storage in Concrete
Editor(s): Assia Djerbi, Othman Omikrine-Metalssi, Teddy Fen-Chong
ISBN:
e-ISBN: 978-2-35158-232-9
Publisher: RILEM Publications SARL
Publication year: 2019
Pages: 73-79
Total Pages: 7
Language : English

Abstract: With increasing social awareness, concerning impacts of climate change, carbon capture and
utilization (CCU) is gaining traction on a world scale. It is being pushed forward by the
European Union as one of the important levers to mitigate its greenhouse gases emissions.
Life Cycle Assessment (LCA), and its derived carbon footprint method, is thus becoming a
crucial point of support to provide a strategic political vision. However, these guidelines rely on
current LCA standards and practices and are not adapted to provide a strategic vision. System
modelling of environmental impacts of valorization technologies with LCA use substitution
scenarios and/or consequential LCA. Consequential LCA only considers unconstrained
markets: every product issued from a valorization or CCU process is always considered as a
substitute for a determining product. However, this is not always what is observed, especially
in the construction and demolition sector. Valorization technologies are always developed
according to a given state of external constraints defined by waste composition and amounts
as well as existing regulations and their amounts and nature is constantly changing. Thus, the
first focus of waste treatment industries is thus to find possible technological means to “get rid
of” undesirable amounts of waste or carbon dioxide, but the fact that it can replace existing
and determining products is by and large ignored. To reflect actual situation, there is a need
to introduce the possibility of constrained markets in the models. With constrained markets,
price elasticity cannot be used as the basic relationship between price, demand and produced
amounts. Thus, for constrained markets, the product scale is not adapted. To overcome the
abovementioned obstacles, we propose a transdisciplinary approach described in this paper.
This approach is currently being developed through its application to valorization of New
Caledonia nickel slags by CCU, in the CARBOSCORIES 2 and CARBOVAL projects.

Online publication : 2019
Publication type : full_text
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