Flowing insights: Key discoveries, recommendations, and guidelines from the Life Cycle Assessment of NBS WT with a focus on a constructed wetland case study
2024
Dufossé, Karine | Loiseau, Eléonore | Forquet, Nicolas | Molle, Pascal | Technologies et Méthodes pour les Agricultures de demain (UMR ITAP) ; Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut Agro Montpellier ; Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro) | Réduire, valoriser, réutiliser les ressources des eaux résiduaires (UR REVERSAAL) ; Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | IWA
International audience
Show more [+] Less [-]English. Environmental assessment, carried out through the life cycle assessment (LCA) method applied to NBS, presents numerous challenges. The case study involved a constructed wetland with two stages of vertical flow (French system), incorporating a complete mass balance (N, P, and C cycles) accounting for emissions to water (output of the filter), air (direct emissions), and soil (sludge spreading and reed biomass composting). Initial results indicate that the mass balance plays a crucial role in the environmental impacts. Therefore, as a recommendation, it cannot be omitted when conducting such an LCA. However, simplified emission factors can be proposed. Indirect emissions from sludge field fertilizing should also be taken into account, along with the impacts of avoided mineral fertilizers. This should provide guidelines in cases where simplifying the data gathering for LCA is considered, without a significant loss of information.
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