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Quantification and Environmental Assessment of Wood Ash from Biomass Power Plants: Case Study of Brittany Region in France

Author

Listed:
  • Karine Dufossé

    (UniLaSalle-Ecole des Métiers de l’Environnement, CYCLANN, Campus de Ker Lann, 35170 Rennes, France)

  • Marine Marie-Charlotte

    (UniLaSalle-Ecole des Métiers de l’Environnement, CYCLANN, Campus de Ker Lann, 35170 Rennes, France)

  • Vincent Augiseau

    (UniLaSalle-Ecole des Métiers de l’Environnement, CYCLANN, Campus de Ker Lann, 35170 Rennes, France)

  • Thierry Henrion

    (UniLaSalle-Ecole des Métiers de l’Environnement, CYCLANN, Campus de Ker Lann, 35170 Rennes, France)

  • Hayet Djelal

    (UniLaSalle-Ecole des Métiers de l’Environnement, CYCLANN, Campus de Ker Lann, 35170 Rennes, France)

Abstract

The increasing demand for energy is leading to the increasing use of renewable resources, such as biomass, resulting in the significant development of the wood energy sector in recent years. On the one hand, and to a certain extent, the sector has generated many benefits. On the other hand, the challenges related to wood ash (WA) management such as increasing tonnages, landfilling, restrictive regulations for reuse, etc., have been weighing more heavily in the debate related to the wood energy sector. However, all studies have assumed that no environmental impacts can be attributed to WA production. This study aims at discussing this assumption, whether the WA is a waste or a co-product of heat generation. In the first place, WA deposits were estimated using the biomass database and ash content from the literature regarding the collective, industrial and tertiary biomass power plants (BPP) in the French region of Brittany. Then, the impacts of the generated WA were estimated using the attributional life cycle assessment (LCA) method through two different impact allocation procedures (IAP), “from cradle to gate” (excluding the waste treatment). In Brittany, for the year 2017, an estimated amount of 2.8 to 8.9 kilotons of WA was generated, and this production should increase to 5 to 15.7 kilotons by 2050. The LCA conducted through this study gave an emission of 38.6 g CO 2eq /kW h, with a major contribution from the production of the wood chips. Considering the environmental aspect, the IAP analysis indicated that energy and economic allocations were not relevant, and that, using the mass allocation, the environmental production of WA could represent 1.3% of the impacts of the combustion process in BPP. Therefore, WA, and especially the fly ash, can be considered as a waste from BPP heat production, without any environmental impact attributed to its generation.

Suggested Citation

  • Karine Dufossé & Marine Marie-Charlotte & Vincent Augiseau & Thierry Henrion & Hayet Djelal, 2021. "Quantification and Environmental Assessment of Wood Ash from Biomass Power Plants: Case Study of Brittany Region in France," Sustainability, MDPI, vol. 14(1), pages 1-17, December.
  • Handle: RePEc:gam:jsusta:v:14:y:2021:i:1:p:99-:d:709001
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    References listed on IDEAS

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