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- Novel approach to location planning of hydrogen refueling stations: How market drivers and existing infrastructure impact the hydrogen economyPublication . Espinha, Maria; Portillo, Juan C. C.; Simoes, Sofia; Barbosa, Juliana PachecoABSTRACT: This study aims to present a novel methodology to assess future potential location of hydrogen refueling stations (HRS), involving geospatial and levelized costs of hydrogen (LCOH) analyses. This methodology entails five stages and was developed and applied to mainland Portugal. It can be used in other regions or countries. In this study, a total of 708 potential locations for different HRS were identified and studied for five scenarios. The results indicate that LCOH varies between a minimum of 6.5 €/kg H and a maximum of 11.2 €/kg H. Moreover, 3 574 routes were analyzed considering four hydrogen production sites and the five scenarios, of which 2 395, or 67% of the routes, have a LCOH of between 6 - 9 €/kg H. The main conclusions of the study indicate that there are significant regional disparities in Portugal and that the adoption of hydrogen as an alternative fuel still presents challenges, especially in regions with limited hydrogen refueling infrastructure. The uneven distribution of hydrogen infrastructure and the high associated costs are likely to further exacerbate these economic and technological disparities. Addressing these imbalances requires the development of regional strategies that encourage, for example, hydrogen production in remote and underserved regions.
- Enhancing microalgal biohydrogen production: Unlocking higher yields with hydrothermal pretreatment with niobium phosphatePublication . Silva, Thiago; Jesus Junior, Maurino Magno; Neves de Araujo, Matheus; Castro, Laressa Santos; Fuess, Lucas Tadeu; Rodrigues, Fábio de Ávila; Zaiat, Marcelo; Reis, Alberto; Calijuri, Maria LuciaABSTRACT: Microalgae cultivated in wastewater hold promise as a substrate for biohydrogen (bioH2) production. However, their rigid cell walls pose a challenge to fermentability. In this context, this study evaluated hydrothermal pretreatment with niobium phosphate (NbP) at 100-180 degrees C for 0-70 min, using up to 75 % NbP (relative to the dry weight of microalgal biomass). The hydrothermal pretreatment at 180 degrees C for 10 min with 75 % NbP released 7431 mg total carbohydrates (CHt) L-1, increasing the availability of fermentable substrates in subsequent dark fermentation (DF). When this pretreated biomass was subsequently fermented at pH 5.0 (sample PB5), bioH2 production reached 1.03 mmol H2 mol-1 CHt, with a maximum cumulative output of 0.17 mmol H2 and a CHt conversion efficiency of 83.6 %. In contrast, pH 5.5 and 6.0 reduced bioH2 yields and promoted methanogenic activity, while no pH control resulted in negligible bioH2 evolution. In conclusion, hydrothermal pretreatment with niobium phosphate and pH improvement synergize to enhance hydrogenogenesis, integrating wastewater treatment and renewable biohydrogen production.
- Desenvolvimento de um Pipeline Semiautomático para Estimativa de Sólidos Suspensos Totais via Sentinel-2 e SNAP GPT [Poster]Publication . Gonçalves, Pedro; Nave, Silvia
- Leveraging the ESA Network of Resources (NoR) for Ultra High-Resolution Monitoring of Coastal Morphodynamics: Praia d’el Rey Case Study [Poster]Publication . Nave, Silvia; Gonçalves, Pedro; Albardeiro, Luís; Mesquita Soares, Sofia
- HydroRS: Uma ToolboxMulti-Sensorpara Processamento Automático e Monitorização de Recursos Hídricos [Poster]Publication . Gonçalves, Pedro; Francés, Alain Pascal; Fernandes, Judite
- Monitorização Remota de Solos no Interior de Portugal: Integração de Dados Multiespectrais e LiDAR via VANT [Poster]Publication . Gonçalves, Pedro; Carvalho, J.; Torres, Rita; Morgado, Rita; Henriques, J.; Simões, B.; de Oliveira, Daniel Pipa Soares; Nave, Silvia
- Aplicações da Deteção Remota à Geologia [Comunicação oral]Publication . Quental, Lídia
- New Contributions to Mineralogical and Geochemical Knowledge of Old Preguiça Mine, Beja, PortugalPublication . Silva, Teresa; Morais, Igor; Mesquita Soares, Sofia; Rodrigues, Ivo; de Oliveira, Daniel Pipa Soares; Mirao, JoseABSTRACT: Abandoned mining areas provide valuable opportunities to investigate ore-forming processes, supergene mineral transformations, and the geochemical behaviour of metals. In this sense, the old Preguiça mine (Beja, Portugal), exploited for Fe–Zn–Pb, was studied providing new mineralogical and geochemical data aimed at improving the understanding of the secondary mineral assemblages of this deposit. A total of 70 samples collected from three accessible underground levels (first, second and third) and mine waste, complemented by 16 samples from a deeper level (fourth) previously collected, were analysed using X-ray diffraction (XRD), scanning electron microscopy (SEM), and a portable X-ray fluorescence (pXRF) equipment. Mineralogical phases are dominated by a wide range of secondary oxides, carbonates, arsenates, vanadates, silicates, phosphates and sulphates, but remnants of primary sulphides were also found. The following minerals can be emphasised: goethite, hematite, calcite, dolomite, descloizite, willemite, mimetite, cerussite, smithsonite and fraipontite. The presence of massicot in the Preguiça mine, is described for the first time. Bulk geochemical analyses show high concentrations of Fe, Ca, Zn and Pb, consistent with the observed mineralogy. The presence of vanadium- and arsenic-bearing minerals highlights the occurrence of critical raw materials, supporting the importance of reassessing other abandoned mining areas in the context of sustainable resource management and strategic raw-material planning.
- From waste to circularity: the potential of different treatments of poultry manure and forestry residues in a hot-spot production region in PortugalPublication . d'Espiney, Ana; Verworner, Bengt; Pinheiro, Helena; Isabel, Marques; Oehmichen, Katja; Engler, Nils; Majer, Stefan; Stinner, Walter; Thrän, DanielaABSTRACT: 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.
- Insights into rare earth elements and other critical raw materials from Castelo Branco massif alluvial deposits (Portugal)Publication . Salgueiro, Rute; Silva, Teresa; Martín-Méndez, I.; de Oliveira, Daniel Pipa Soares; Batista, Maria Joao; Inverno, CarlosABSTRACT: Actual and future demands for critical raw materials and strategic raw materials (CRM/SRM) justify the global search for their potential sources and the exploration approaches to reach them. This study discloses the characterization of rare earth elements (REE) and other CRM-bearing alluvial heavy minerals samples sourced from the late- to post-tectonic Variscan Castelo Branco Massif (Portugal). It also contributes to an understanding of REE, Th, and U anomalies from local and correspondent stream sediments identified in past geochemical surveys. The alluvial samples were subjected to semiquantitative analysis of their minerals under a binocular microscope and to chemical analysis through portable X-ray fluorescence. A varied mineralogical association and a geochemical fingerprint compatible with their main granitic source was identified, revealing several minerals that carry CRM, in which REE and titanium minerals stood out. The titanium minerals have the higher average abundance (54%), being ilmenite-dominant (50%), as supported by the relatively higher Ti content of these samples (up to 28.88%). The REE minerals occur as accessories and have a summing average of 12%, in which monazite is the most abundant (4.97%). Geochemical data support alluvial monazite as the mineral with the highest REE and Th concentrations, as described in the literature on its granitic source. In addition, the magnetic fraction of samples (∼85%) that includes monazite and xenotime presents LREE anomalous contents (up to 4,557 mg/kg) in relation to their granitic source, NASC, and even to ΣREE anomalous values revealed by local stream sediments. The Th (up to 1,969 mg/kg) and U (up to 244 mg/kg) contents follow the same trend. Nevertheless, the nonmagnetic mineral fraction that includes apatite and zircon reaches higher U contents (up to 448 mg/kg). This study indicates that the SRM Ti (ilmenite) and LREE (monazite) have the potential to form placer deposits sourced from Castelo Branco granitic rocks in a wider area, which is supported by the regional Ti placers exploited in the past. The occurrence of other accessory elements/minerals with industrial applicability associated with those placers may also represent future added value.