Mestrado em Energia
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- ItemInfluência do Potencial da Estruvita (MgNH4PO4.6H2O) Sintetizada em Reator Air-Lift no Cultivo de Microalga Nannochloropsis Oculata(Universidade Federal do Espírito Santo, 2023-12-14) Bento, Nícholas Alexandre Berger; Cotta, Aloísio José Bueno; https://orcid.org/0000-0002-7084-0705; http://lattes.cnpq.br/3298545143757892; Porto, Paulo Sérgio da Silva; https://orcid.org/0000-0002-6486-7813; http://lattes.cnpq.br/7140925853660088; https://orcid.org/0009-0004-4082-2751; http://lattes.cnpq.br/9647502968528308; Pinotti, Laura Marina; https://orcid.org/0000-0002-5012-6811; http://lattes.cnpq.br/5616576281329159; Duarte Filho, Paulo Fernando Marques; https://orcid.org/0000-0003-1423-672X; http://lattes.cnpq.br/2725334713449327This study investigated the nutritional potential of struvite (MgNH4PO4·6H2O), a fertilizer composed of magnesium, ammonium, and phosphate, obtained synthetically and from an industrial effluent. In addition to contributing to the recovery of water bodies by reducing concentrations of ammonium and phosphate, and preventing eutrophication, this precipitation technique results in a commercially valuable product due to the growing demand for fertilizers. The objective of the study was to evaluate the nutritional potential of struvite synthesized in an air-lift reactor in the cultivation of microalgae, based on determining the most efficient and economically viable struvite precipitation condition using synthetic effluent. Variations in molar ratios (without excess Mg; 25% and 50% excess Mg) and air agitation velocities (3, 4.5, and 6 L.min1 ) in the fluidized bed, as well as reaction supersaturation based on ammonium concentration (125, 250, and 375 mg.mL -1 ), were analyzed. The evaluated responses included the removal of ammonium, phosphate, and magnesium, as well as struvite precipitation and the content of precipitate formation. He results indicate a 95% precipitate yield, highlighting the influence of ammonium concentration on the removals of Mg2+, NH4 + , and PO4 3- . In Nannochloropsis oculata cultures, conducted with 'Guillard medium,' 'Guillard enriched with synthetic struvite,' 'Guillard enriched with industrial struvite,' and 'only struvite,' cultivation with only struvite demonstrated potential as a nutritional source, achieving a cell density of 2.57x107 cells.mL-1 . The comparison between synthetically produced struvite and struvite from an industrial effluent revealed similar cellular growth behavior, suggesting equivalence in nutritional potential. It is concluded that, under the studied experimental conditions, the results are satisfactory, allowing to production of a fertilizer by the used air-lift reactor and effective application of struvite as a nutritional source in the cultivation of the microalga Nannochloropsis oculata.
- ItemO Gás Natural como Fonte Geradora na Diversificação da Matriz Elétrica Brasileira(Universidade Federal do Espírito Santo, 2023-04-05) Barcelos, Mariana Vieira; Meneguelo, Ana Paula; https://orcid.org/0000000262241139; http://lattes.cnpq.br/1800610548349937; https://orcid.org/; http://lattes.cnpq.br/; Junior, Jorge Luiz dos Santos; https://orcid.org/; http://lattes.cnpq.br/; Furtado, Andreia Cristina; https://orcid.org/; http://lattes.cnpq.br/abstract
- ItemSÍNTESE E CARACTERIZAÇÃO DE EMULSÕES ÓLEO EM ÁGUA PARA INJEÇÃO EM MEIOS POROSOS(Universidade Federal do Espírito Santo, 2022-12-23) Dias, Leticia Silveira; Guzman, Oldrich Joel Romero; https://orcid.org/0000000157746987; http://lattes.cnpq.br/3981995002595753; https://orcid.org/0000000243255148; http://lattes.cnpq.br/; Meneguelo, Ana Paula; https://orcid.org/0000000262241139; http://lattes.cnpq.br/1800610548349937; Quinones, Danmer Paulino Maza; https://orcid.org/; http://lattes.cnpq.br/abstract
- ItemEstudo da percepção pública sobre a captura e armazenamento geológico de CO2 (CCS) nas Universidades Públicas da região sudeste brasileira(Universidade Federal do Espírito Santo, 2023-03-23) Toé, Lucas Alexandre Franklin; Meneguelo, Ana Paula; https://orcid.org/0000000262241139; http://lattes.cnpq.br/1800610548349937; https://orcid.org/0000-0001-8676-3938; http://lattes.cnpq.br/2390562314197714; Chaves, Gisele de Lorena Diniz; https://orcid.org/0000000163599063; http://lattes.cnpq.br/0319559373628489; Possan, Edna; https://orcid.org/0000-0002-3022-7420; http://lattes.cnpq.br/0581995805825838In the light of what is intended for the coming decades, it is predicted that around 70% of the global energy base is still from fossil fuels, with this percentage expected to be maintained by 2050, which points to an increase and maintenance of GHG emissions on the planet, especially carbon dioxide (CO2), cause of the greenhouse effect. From the global outlook on environmental problems, as well as their forecasts, Carbon Capture and Storage (CCS) technology is an alternative in the effort to reduce GHG emissions on the planet. Because it is a technology with potential for implementation in Brazil, added to the difficulty in assuming and meeting GHG mitigation goals and the small amount of work on public perception regarding SCC technology in the country, this dissertation aimed to analyze the public perception about SCC technology from the opinion of professors and students in exercise in federal universities in southeastern Brazil, relating it to environmental awareness in the context of climate change. To obtain the data, a questionnaire elaborated entirely online was applied in federal universities in southeastern Brazil, answered by 671 individuals, among students and professors who work in the universities under study. For the synthesis of the data, a descriptive analysis of the results was performed to compare the answers, as well as hypothesis tests with different groups of the population to evaluate the existence of association between the variables of interest. The results showed that knowledge of SCC is still incipient, with only 7% of the population considered to have an understanding of technology. However, the largest proportion of respondents revealed that they accepted the technology (65%) and agreed that public resources (52%) should be injected into it. The results also point to a relationship between those who care about climate change and those who accept CCS, indicating that greater knowledge about technology can influence its acceptance, especially if the security aspects of technology are improved.
- ItemANÁLISE DA APLICAÇÃO DE FERRITAS DE COBALTO EM PROCESSO DE ELETROCOAGULAÇÃO PARA TRATAR EMULSÕES OLEOSAS RESIDUAIS(Universidade Federal do Espírito Santo, 2022-10-27) Vieira, Damaris; Porto, Paulo Sergio da Silva; https://orcid.org/0000000264867813; http://lattes.cnpq.br/7140925853660088; https://orcid.org/; http://lattes.cnpq.br/; Borges, Raquel Machado; https://orcid.org/; http://lattes.cnpq.br/; Bacelos, Marcelo Silveira; https://orcid.org/0000000208386839; http://lattes.cnpq.br/3741207242086712abstract