Proposition d'une méthode d'allocation par répartition paramètre-dépendant pour l'Analyse du Cycle de Vie des produits déchet-sourcés - Application aux fertilisants phosphatés boue-sourcés

Abstract : Human activities produce wastewater that generates sludge, a waste recycled on agricultural soils or for energy recovery. Extensive research is currently undergone on sludge to develop processes that can convert it into products with high-added value. In this context, sludge could move from a fatal waste status to the status of an expected co-product of wastewater treatment. This paradigm shift has implications for the assessment of environmental impacts of "sludge-based" materials with Life Cycle Assessment. Indeed, sludge becomes an expected co-product from the wastewater treatment plant and the environmental burden of their production must be distributed among co-products by means of an allocation factor. This thesis aims at defining a mathematical construction of this allocation factor by combining process- and product-related parameters, integrating de facto the causal relationships between process operations and products generation and the technological reality of the process. The result is a matrix of which each element associates, for each inventory data, an allocation factor to each of the generated co-products. Applied to the production of sludge-based phosphate fertilizers, LCA highlights the major contribution of the production stage compared to the stages of treatment and recovery of the sludge. Nevertheless, the method developed within this thesis to allocate an environmental load to each co-products of an indivisible production system paves the way for a more coherent environmental assessment of waste-based products. This methodology can also be used effectively in the environmental assessment of thermal, chemical or physical separation processes.
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Submitted on : Thursday, July 19, 2018 - 11:06:16 AM
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  • HAL Id : tel-01654530, version 3

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Marilys Pradel. Proposition d'une méthode d'allocation par répartition paramètre-dépendant pour l'Analyse du Cycle de Vie des produits déchet-sourcés - Application aux fertilisants phosphatés boue-sourcés. Autre. Université de Lyon, 2017. Français. ⟨NNT : 2017LYSEM032⟩. ⟨tel-01654530v3⟩

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