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Bioregion efficiency and profitability | Optimisation of bioenergy production and byproducts valorisation
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Potencial bioenergético dos resíduos orgânicos das florestas e da indústria aviária da região de Lafões
Publication . d'Espiney, Ana; Marques, Isabel Paula
RESUMO: A Associação de Desenvolvimento Rural de Lafões (ADRL, Portugal), entidade de gestão florestal e promotora desta pesquisa, desenvolve esforços que visam a adequada gestão dos resíduos originados na região. Na percussão de estratégias para uma gestão sustentável, definiu-se como objetivo numa primeira etapa o mapeamento dos resíduos da indústria aviária e das unidades de gestão florestal de Lafões. Utilizaram-se métodos baseados em Sistemas de Informação Geográfica, orientados por pressupostos metodológicos, referidos em bibliografia selecionada a partir de revisão bibliográfica, obtendo-se a quantidade anual em matéria seca, no que concerne à biomassa florestal. Quanto à biomassa dos aviários, optou-se pela recolha de dados junto das entidades regionais, seguindo as orientações metodológicas do IPCC e de outras entidades nacionais, estimando-se a sua quantidade anual em sólidos voláteis. Os valores obtidos foram 67 Mt VS/ano (60% da classe florestal eucalipto e 33% da pinheiro-bravo) e 69 Mt MS/ano (78 % da classe de aves frango) de biomassa florestal e dos aviários, respetivamente.
Correction to: Biomass and bioenergy potentials of bioresidues: assessment methodology development and application to the region of Lafões
Publication . d'Espiney, Ana; Pinheiro, H. M.; Marques, Isabel Paula; Kretzschmar, Jörg; Cyffka, Karl‑Friedrich; Thrän, Daniela
ABSTRACT: Bioenergy research aims to uncover the potentials of biological residues. Regional-specific characterization of such potentials is needed to improve the use of local resources, decisions on bioenergy conversion routes, and services within global efforts against climate change. The definition and calculation of the theoretical and technical biomass and bioenergy potentials are keys for developing sustainable use pathways at a regional level. The present work develops a methodology where theoretical framework, quantification methods, and values for the necessary parameters, to assess regional biomass and bioenergy potentials, are considered. The region of Lafoes (Portugal) is the case study to illustrate the application of the methods, resulting in three bioresidue categories (agricultural by-products, forestry residues, and municipal waste) and two bioenergy conversion routes (biochemical and thermochemical). The biochemical conversion route revealed a technical energy potential of 765 TJ yr-1, comparing favourably with the 543 TJ yr-1 achieved by the thermochemical route. Also, the environmental and economic performances, associated with the implementation of bioenergy technologies, are possibly better achieved through the biochemical route, to be assessed through life cycle analyses and life cycle costing. Regardless of action priorities, the two conversion routes combined can potentially cover the entire current electrical energy demand of the region. This should also be appraised with expectations in mind for both flexible bioenergy services (with other renewables) and for bioenergy usage in applications which are difficult to defossilize.
From waste to circularity: the potential of different treatments of poultry manure and forestry residues in a hot-spot production region in Portugal
Publication . d'Espiney, Ana; Verworner, Bengt; Pinheiro, Helena; Isabel, Marques; Oehmichen, Katja; Engler, Nils; Majer, Stefan; Stinner, Walter; Thrän, Daniela
ABSTRACT: Purpose The management of biogenic residues in a way that extends the lifetime of carbon within the systems is a focus of the present work. Different waste management systems are assessed in terms of GHG emissions and removals, aiming to identify that with the lowest impact on climate change. Methods A life cycle comparative analysis is performed, assessing the mitigation of the impact on climate change of the current waste management system (A) of the top two residues of a Portuguese region – composting of poultry manure and open air burning of forestry residues – considering two bioenergy solutions: biochemical conversion of poultry manure and thermochemical conversion of wood residues (B); biochemical conversion for both residues together (C), implying fungal pre-treatment of the wood residues, which adds a food product to the supply chain. Data were retrieved from literature and from authors’ experimental work. Assumptions underlying the methodological framework (e.g., cut offs inherent to comparative assertions) are discussed. A sensitivity analysis covers uncertainties underpinning bioenergy systems assessments (e.g., unperfect substitution and rebound effect phenomena). Results and discussion The highest impact on climate change is observed with system A, greenhouse gas (GHG) emissions 2 to 3 times higher than those of the other two systems. System A also performs poorly in conserving the biomass, e.g., forestry residues burning results in carbon being directly released to the atmosphere with no valuable intermediate use. In the base scenario, system B results in the lowest GHG emissions of the three systems, producing biochar, which contributes to carbon sequestering, and biodiesel. Nevertheless, system C can result in the lowest GHG emissions, in a scenario considering unperfect substitution with renewable sources being selected to match the biodiesel supply of system B. Conclusions System A is least preferable among the three options. Between systems B and C, ranking depends on whether unperfect substitution is considered. System B performs better in all scenarios, except with unperfect substitution, where
system C outranks B. Moreover, system C achieves a higher yield of digestate, a product providing other ecosystem services. Thus, in future research, the inclusion of other impact categories in LCA can reveal a better overall environmental performance for system C.
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Fundação para a Ciência e a Tecnologia
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SFRH/BD/146002/2019