Navegando por Autor "Naves, Fabiano Luiz"

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An unconventional two-stage cultivation strategy to increase the lipid content and enhance the fatty acid profile on Chlorella minutissima biomass cultivated in a novel internal light integrated photobioreactor aiming at biodiesel production.
(2020) Amaral, Mateus de Souza; Loures, Carla Cristina Almeida; Pedro, Guilherme Arantes; Reis, Cristiano Eduardo Rodrigues; Castro, Heizir Ferreira de; Naves, Fabiano Luiz; Silva, Messias Borges; Prata, Arnaldo Márcio Ramalho
Biodiesel quality is dependent upon the fatty acids distribution of the raw material used in the trans/ esterification reactions. While microalgae cells are regarded as potential oil suppliers for the biodiesel production chain, a common criticism is related to the low lipid productivities and often to a poor fatty acid distribution. In the present work we propose to submit microalgal cultivation to a second stage with nutritional stress by a simple addition of a 70% nitrate source depleted medium at the beginning of stationary phase, without harvesting cells, saving time and water. Chlorella minutissima was cultivated in a novel unconventional photobioreactor, named Internally Illuminated Integrated Photobioreactor (ILI- PBR), to verify the efficiency of the proposed strategy. Biomass concentration, lipid content and volu- metric lipids productivity increased 24.9%, 120.7% and 55.6%, respectively, from Stage 1 to Stage 2, when ILI-PBR was illuminated by constant blue LED and 0.5 vvm of aeration. The fatty acid profiles, evaluated in terms of LED illumination (white, red and blue), showed a predominance of palmitic acid in all cases (59.49%, 57.28% and 46.51%, respectively), which allowed to enhance some biodiesel properties such as cetane number, cold filter plugging point, density and kinematic viscosity, according to international specifications.
Evaluation of cell growth performance of microalgae Chlorella minutissima using an internal light integrated photobioreactor.
(2020) Amaral, Mateus de Souza; Loures, Carla Cristina Almeida; Naves, Fabiano Luiz; Silva, Messias Borges; Prata, Arnaldo Márcio Ramalho
Microalgae have received special attention due to the biotechnological potential of their biomass, which can be used to produce biofuels, food formulations and pharmaceutical products. In order to improve biomass productivity, the present work proposes an internal light integrated photobioreactor (ILI-PBR), which integrates two configurations of photobioreactors (PBRs) already consecrated and widely used (tubular and bubble column) in a single system, combining the benefits of each configuration in a single PBR. To evaluate the applicability of ILI-PBR, a comparative test was conducted with the internal light bubble column photobioreactor (ILBC-PBR); both PBRs were illuminated with blue light-emitting diodes (LED).The PBR’s performance was evaluated in terms of specific growth rate (µmax) and cell productivity (PX) of the microalgae Chlorella minutissima. The µmax and PX in ILI-PBR were at least 42.85 and 58.06 % higher than ILBC-PBR, respectively. ILI-PBR was 36 % more efficient in terms of electricity consumption than ILBC-PBR.
Modeling and optimization of hybrid leachate treatment processes and scale-up of the process : review.
(2021) Vaz, Carlos Alberto dos Santos; Samanamud, Gisella Lamas; Silva, Ricardo Soares da; França, Alexandre Bôscaro; Quintão, Cristiane Medina Finzi; Urzedo, Ana Paula; Silva, Messias Borges; Bosch Neto, Juan Canellas; Amaral, Mateus de Souza; Loures, Carla Cristina Almeida; Naves, Luzia Lima Rezende; Naves, Fabiano Luiz
Optimized models of landfill leachate processes that could lead to the production of fuel oils from the pyrolysis of plastics and cultivation of microalgae, can be high-efficient and sustainable activities. Studies using advanced oxidation processes in combination with biological processes showed to be efficient in treating leachate. The complexity of this type of waste, as well as the continuous modification of its properties due to local seasonality, prevent kinetic and thermodynamic studies to predict the steady state at the final disposal. Environmental management system using Lean Six sigma accompanied with process modeling and optimization tools, whether statistical or computational, generate reliable models. These models can reproduce reductions on contaminants by confirming the initial conditions of each leachate enabling the scale-up of the process. This Review provides data survey, types of treatment and models linked to optimization tools in wastewater decontamination processes from municipal solid waste (MSW). This review includes the synthesis and proposal for treatment and man- agement from of the classification of the garbage until the generation of leachate, aiming to contributing to future researches in the leachate treatment.
Modeling and optimization of the pyrolysis oil production process from polypropylene for the production of aviation kerosene.
(2022) Santos, Heraclito Alexandre dos; Santos, Igor José Boggione; Quintão, Cristiane Medina Finzi; Knupp, Vagner Fernandes; Lofrano, Renata Carolina Zanetti; Oliveira, Eliane Cristina de; Samanamud, Gisella Lamas; Amaral, Mateus de Souza; França, Alexandre Bôscaro; Pereira, Mariana Arruda; Silva, Matheus Teixeira Araújo; Loures, Carla Cristina Almeida; Carneiro, Mozart dos Santos; Ponciano, Jéssica Amaral Pereira; Naves, Luzia Lima Rezende; Naves, Fabiano Luiz
One of the greatest challenges in the world is in the fnal disposal of plastics in order to reduce the efect of its polluting potential. Thus, the application of pyrolysis processes in generating products of interest such as fuel oils can be part of the solution. In addition to reducing greenhouse gas emissions to the atmosphere, oil can enter the supply chain after the cracking process in petrochemical industries. In this context, this work used statistical modeling of the response surface linked to the normal boundary intersection algorithm, aiming at a higher yield of oil production and major selectivity of recycled polypropylene pyrolysis. From the analysis of the mechanisms proposed in the literature with the modeling and optimization in this work, it was possible, from a kaolin mass of 9.12 g and a heating ramp of 19.37 °C/min, to obtain higher percentages of aviation kerosene as well as a satisfactory performance.
Otimização de Ciclos Rankine Orgânicos supercríticos : proposta de escolha do fluido de trabalho.
(2023) Alves, Izabela Mendes; Rocha, Luiz Joaquim Cardoso; Rocha, Luiz Joaquim Cardoso; Naves, Fabiano Luiz; Leal, Elisângela Martins; Rocha, Ana Maura Araújo
Os Ciclos Rankine Orgânicos são uma variação do ciclo Rankine convencional. Neste tipo de ciclo, fluidos orgânicos são utilizados em substituição à água. A principal vantagem deste ciclo é a possibilidade de serem utilizados em fontes de baixa temperatura e pressão, 400 °C e 30 bar, enquanto ciclos de potência a água operam com temperaturas entre 320-620 °C e pressão de 20-250 bar. Isso possibilita que as fontes de calor dos ORCs (Organic Rankine Cycles) sejam energia geotérmica, energia solar, recuperação de calor residual e biomassa. Consequentemente, os ORCs se apresentam como uma fonte alternativa aos combustíveis fósseis para a geração de energia elétrica. Como se trata de uma tecnologia relativamente nova, necessita de mais estudos e investimentos para seu desenvolvimento a fim de se tornar uma opção competitiva e eficiente. Este trabalho propôs a simulação de 14 fluidos orgânicos supercríticos em quatro configurações de ciclo, com o objetivo de encontrar o fluido de melhor rendimento térmico, exergético e maior produção de trabalho líquido. As simulações foram realizadas no Engineering Equation Solver (EES), utilizando dois recursos desse software: tabelas paramétricas e a ferramenta de otimização. O fluido que apresentou o melhor resultado foi o benzeno, com 25,20% de eficiência térmica, 43,85% de eficiência exergética e trabalho líquido de 3086,2 kW.