http://repositorio.ufgd.edu.br/jspui/handle/prefix/1938 Mon, 10 Aug 2026 18:50:21 GMT 2026-08-10T18:50:21Z http://repositorio.ufgd.edu.br/jspui/handle/prefix/6789 Título: Análise da gestão da torta de filtro: um estudo de caso sobre indicadores, eficiência e sustentabilidade no processo sucroalcooleiro Autor(es): Vargas, Caroline Maria de Primeiro Orientador: Deliberador, Lucas Rodrigues Abstract: The Brazilian sugar-energy sector holds substantial importance in the context of the energy transition, and filter cake constitutes a key by-product for operational efficiency and environmental management due to its agronomic potential and high levels of phosphorus and organic matter. This study examined the management of filter cake in a sugar-ethanol mill located in southern Mato Grosso do Sul and identified actions capable of optimizing its control and utilization. Filter cake is generated after juice decantation in the filter press and may indicate operational inefficiencies when it presents high sugar content or excessive moisture. The research employed a single case study supported by a literature review, a semi-structured questionnaire, a technical visit, and qualitative content analysis. The results showed that the main indicators monitored include Polarization (Pol), Moisture, and Total Recoverable Sugars (ATR), with targets of Pol below 1.2% and moisture between 64% and 70%. It was observed that Pol remained above the established limit, indicating sucrose losses, although moisture stayed within the ideal range. Moreover, operational issues such as vacuum leaks, misaligned scrapers, and damaged screens compromise filtration efficiency, characterizing the filters as a potential industrial bottleneck. Current improvement actions include testing different polymers, adjusting the sludge pH, and conducting daily laboratory monitoring. The filter cake is sent to the composting yard and applied as fertilizer in the fields. Accordingly, the adoption of automatic pH control and preventive maintenance of the screens is recommended, reinforcing that proper management of filter cake contributes to cleaner production (CP) and to the circular economy within the sugar-energy sector. Theoretically, the study expands the understanding of the factors that influence filtration efficiency in the sugar-energy industry, while from a managerial perspective it offers practical insights to enhance operational control and the agronomic valorization of filter cake. Editor: Universidade Federal da Grande Dourados Tipo: Trabalho de Conclusão de Curso Fri, 12 Dec 2025 00:00:00 GMT http://repositorio.ufgd.edu.br/jspui/handle/prefix/6789 2025-12-12T00:00:00Z http://repositorio.ufgd.edu.br/jspui/handle/prefix/6784 Título: Análise das estratégias de controle de temperatura em uma estufa de secagem Autor(es): Rossi, Weslen Felipe Magri Primeiro Orientador: Gibelli, Gerson Bessa Abstract: This work presents the development and simulation-based evaluation of control strategies applied to a laboratory drying oven whose original commercial controller became non operational. The thermal dynamics of the system were experimentally characterized, allowing the identification of a First Order Plus Dead Time (FOPDT) model capable of representing the oven’s heating behavior under disturbances and variations in power. Based on this model, a Proportional–Integral (PI) controller was designed using Internal Model Control (IMC) tuning rules, and a static feedforward action was incorporated to anticipate the steady-state power required to reach a given temperature setpoint. The performance of the PI+FF strategy was compared with the traditional On-Off control in multiple operating conditions, including different temperature setpoints and abrupt drops in temperature simulating door opening. The results show that the PI+FF controller eliminates oscillations, improves transient response, enhances temperature accuracy, and achieves higher energy efficiency for low and medium thermal loads. In contrast, the On-Off approach exhibited substantial oscillations, potential actuator stress due to frequent switching, and limited capability to maintain high temperatures with stability. The findings indicate that physical implementation of the PI+FF controller is a feasible and effective solution to restore and improve the oven’s operation, offering a robust alternative for high-inertia thermal processes. Editor: Universidade Federal da Grande Dourados Tipo: Trabalho de Conclusão de Curso Wed, 10 Dec 2025 00:00:00 GMT http://repositorio.ufgd.edu.br/jspui/handle/prefix/6784 2025-12-10T00:00:00Z http://repositorio.ufgd.edu.br/jspui/handle/prefix/6768 Título: Influência da temperatura e da velocidade do ar na secagem da semente de nêspera (Eribotrya joponica) e avaliação de modelos matemáticos. Autor(es): Andrade, Luana Zanardo de Primeiro Orientador: Galante, Raquel Manazzo Abstract: The loquat (Eriobotrya japonica) is a fruit recognized for its nutritional value and for containing bioactive compounds of functional interest. Its seeds also have potential for food and pharmaceutical applications, making it necessary to understand processes that favor their preservation and stability, such as drying. In this context, the present work evaluated the drying kinetics of loquat seeds under different temperature and air velocity conditions, as well as adjustments of mathematical models to identify those that best represent the process. The seeds were subjected to conditions of 50 °C/1,5 m/s, 65 °C/ 1,5 m/s, and 65 °C/1,0m/s, resulting in effective diffusion coefficients (Def) of 0.00119 × 10⁻¹⁰ m²·s⁻¹, 0.00284 × 10⁻¹⁰ m²·s⁻¹, and 0.00197 × 10⁻¹⁰ m²·s⁻¹, respectively. The increase in temperature and air circulation accelerated moisture removal and raised the Def values, indicating greater efficiency in internal water transport. The Midilli and Two-Term Exponential mathematical models presented the best statistical fits (higher R² and lower MAPE and MSE), describing the experimental behavior with high precision for the evaluated temperatures. Thus, the study highlights the direct influence of operating conditions and reinforces the usefulness of mathematical modeling to optimize the drying of loquat seeds. Editor: Universidade Federal da Grande Dourados Tipo: Trabalho de Conclusão de Curso Wed, 10 Dec 2025 00:00:00 GMT http://repositorio.ufgd.edu.br/jspui/handle/prefix/6768 2025-12-10T00:00:00Z http://repositorio.ufgd.edu.br/jspui/handle/prefix/6767 Título: Construção de revestimentos modificadores de superfície por processo de soldagem a arco elétrico com eletrodo revestido (SMAW) Autor(es): Bernal , Pâmela Brandão; Silva, Rodrigo Josiel da Primeiro Orientador: Pollnow, Edilson Nunes Abstract: This work investigated the surface modification of A36 steel by SMAW welding using fluxes enriched with boron and ferro-niobium carbide (Fe-NbC) in dry and wet routes, focusing on the improvement of properties related to microhardness. The methodology involved visual inspection, macroscopic analysis to determine the dilution rate, microstructural characterization of the fusion zone, heat-affected zone, and base metal, as well as Vickers microhardness tests. The results showed sound weld beads and dilution rates with discrete variations, presenting a tendency for dilution rate reduction with boron and a slight increase with Fe-NbC, with greater stability in dry welding. The microstructures revealed that Fe-NbC favored the formation of dendritic columns and NbC carbides, while boron promoted B₄C carbides and microstructural refinement, with agglomeration at higher concentrations. Microhardness showed moderate variations, with boron being the most effective agent in hardening, approaching the values of the reference sample. The HAZ maintained uniform behavior, and the base metal preserved its original microstructure. It was concluded that boron stood out as the element with the greatest impact on the final performance of the coatings, both by reducing dilution and increasing hardness. Editor: Universidade Federal da Grande Dourados Tipo: Trabalho de Conclusão de Curso Tue, 09 Dec 2025 00:00:00 GMT http://repositorio.ufgd.edu.br/jspui/handle/prefix/6767 2025-12-09T00:00:00Z