Calderón
Calderón es el repositorio institucional del CUD (Centro Universitario de la Defensa) en la ENM (Escuela Naval Militar). El CUD, siguiendo las iniciativas Open Access, pone a disposición de la Comunidad este repositorio donde se da acceso a la producción investigadora, principalmente en forma de Trabajos Fin de Grado, pero también Trabajos Fin de Máster, y otros artículos de investigación publicados por el personal docente e investigador del Centro.
Algunos de los documentos publicados en este repositorio tienen restringido el acceso. Para solicitar su consulta, o para plantear cualquier duda respecto a los contenidos de este respositorio, puede:
- Enviar un correo electrónico a biblioteca@cud.uvigo.es.
- Llamar por teléfono al 986 80 49 89.
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DESEI+D Congreso Nacional de i+d en Defensa y SeguridadInvestigación Comunidad que acoge aquellos artículos de investigación publicados por los docentes del CUD-ENM.Recursos educativos Comunidad en la que se alojan recursos educativos vinculados a la docencia en el CUD-ENMTrabajos Fin de Grado Comunidad en donde se recopilan las memorias de los Trabajos de fin de Grado en Ingeniería Mecánica del CUD-ENMTrabajos Fin de Máster Comunidad en donde se recopilan las memorias/resúmenes presentados como trabajos fin de máster impartidos en el CUD-ENM
Recent Submissions
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Bioethanol production from industrial algae waste
(Waste management, 2019) Alfonsín, Víctor; Maceiras, Rocío; Gutiérrez, Carlos
This paper presents a study carried out to determine the
feasibility to obtain bioethanol from an industrial algae waste. The
influence of some parameters on acid hydrolysis was studied. The results
indicated that the overall hydrolysis ability is a function of the
combined action of acid concentration, temperature and reaction time. The
hydrolysates with higher amount of reducing sugars were used for
ethanolic fermentation using S. Cerevisiae. The highest bioethanol yield
11.6 gEtOH/galgae was obtained at 70 min, a sulphuric acid concentration
of 9% wt. and acid/dried algae ratio of 7. The present study showed that
the industrial waste of Euchema Spinosum contains carbohydrates that can
be converted into bioethanol with an efficiency of 75%. Moreover, the
potential of the residue after acid hydrolysis process as sustainable
solid fuel regarding its properties was analysed. The results were
compared with those obtained from the literature and discussed according
to international standards.
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Transforming Wastewater into Biofuel: Nutrient Removal and Biomass Generation with Chlorella vulgaris
(Energies, 2024-09-30) Salgueiro, José Luis; Pérez-Rial, Leticia; Maceiras, Rocío; Sánchez, Ángel; Cancela, Ángeles
This study investigates the potential of Chlorella vulgaris for nutrient removal and biomass
production in synthetic wastewater. The experiments were conducted in 2 L photobioreactors under
controlled aeration, agitation, and lighting conditions for 19 days. Despite a moderate growth rate
(0.137 d−1), C. vulgaris achieved efficient pollutant removal, with 97% of nitrate, 90% of nitrite, and
90.6% of COD eliminated. Additionally, the biomass was processed to extract fatty acids, yielding
a 20% extraction rate, indicating its potential as a biofuel feedstock. These results demonstrate C.
vulgaris’s dual function in wastewater remediation and biofuel production, presenting a sustainable
and economically viable approach to addressing environmental challenges.
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C02 Capture via Adsorption Using Silica Gel
(European Journal of Sustainable Development, 2024-10-01) Pérez-Rial, Leticia; Alfonsín, Víctor; Maceiras, Rocío; Feijoo, Jorge; Vallejo, Javier P.
This paper investigates the potential of silica gel as an effective adsorbent for C02 capture. The
study explores the adsorption mechanisms, the efficiency of C02 upta.ke, and sorne factors influencing
the adsorption capacity of silica gel.The experimental results demonstrate the significant
potential of silica gel for C02 adsorption under various conditions. Toe adsorption capacity was
found to be highly dependent on parameters such as gas flow rate and the particle size of silica
gel. The findings suggest that ,vith optimized conditions, silica gel could be a viable material
for reducing atmospheric C02 levels. This research contributes to the development of sustainable
and efficient technologies for mitigating climate change through carbon dioxide capture and
storage.
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Assessment of Selected Alternative Fuels for Spanish Navy Ships According to Multi-Criteria Decision Analysis
(Journal of Marine Science and Engineering, 2023-12) Álvarez-Feijoo, Miguel A.; Alfonsín, Víctor; Álvarez-Feijoo, Miguel A.; Llopis, Lara
Climate change and environmental degradation are growing concerns in today’s society,
which has led to greater awareness and responsibility regarding the need to adopt sustainable
practices. The European Union has established the goal of achieving climate neutrality by 2050,
which implies a significant reduction in greenhouse gas emissions in all sectors. To achieve this goal,
renewable energies, the circular economy, and energy efficiency are being promoted. A major source
of emissions is the use of fossil fuels in different types of ships (from transport ships to those used by
national navies). Among these, it highlights the growing interest of the defense sector in trying to
reduce these emissions. The Spanish Ministry of Defense is also involved in this effort and is taking
steps to reduce the carbon footprint in military operations and improve sustainability in equipment
acquisition and maintenance. The objective of this study is to identify the most promising alternative
fuel among those under development for possible implementation on Spanish Navy ships in order
to reduce greenhouse gas emissions and improve its capabilities. To achieve this, a multi-criteria
decision-making method will be used to determine the most viable fuel option. The data provided
by the officers of the Spanish Navy is of great importance, thanks to their long careers in front of
the ships. The analysis revealed that hydrogen was the most suitable fuel with the highest priority,
ahead of LNG, and scored the highest in most of the sections of the officials’ ratings. These fuels are
less polluting and would allow a significant reduction in emissions during the navigation of ships.
However, a further study would also have to be carried out on the costs of adapting to their use and
the safety of their use.
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Influence of Activated Carbon Granulometry on H2 Purification in Glycerol Reforming Syngas: Adsorption and Kinetic Analysis
(Energies, 2024-11-29) Maceiras, Rocío; Feijoo, Jorge; Pérez-Rial, Leticia; Álvarez-Feijoo, Miguel A.; Eslami, Naser
This study investigates the adsorption performance of granular activated carbon (GAC) and pelletized activated carbon (PAC) for the purification of syngas produced from glycerol reforming, focusing on the removal of CO2, CO, and CH4. The adsorption process was studied at two different
flow rates (0.5 L/min and 1 L/min) to assess the impact of particle size and gas flow rate on adsorption capacity. The results indicate that GAC exhibits superior multi-gas adsorption, particularly at lower flow rates, effectively capturing CO2, CO, and CH4, while PAC exhibits lower adsorption
performance. Kinetic analysis revealed that the pseudo-second-order and Avrami models fit well with both adsorbents, though GAC aligns more closely with the Avrami model, reflecting its multi-step adsorption mechanism and greater pore diffusion efficiency. These findings highlight the importance of adsorbent size and flow rate in optimizing hydrogen purification processes, with GAC emerging as a highly efficient adsorbent for industrial-scale syngas treatment.