Programa de Pós-Graduação em Engenharia Sanitária e Ambiental (Mestrado Profissional) - PPGESA/ITEC

URI Permanente desta comunidadehttps://repositorio.ufpa.br/handle/2011/16530

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Acesso aberto (Open Access)
Caracterização física, balanço de massa e avaliação de critérios de projeto da unidade de decantação da estação de tratamento de efluentes de refinaria de alumina
(Universidade Federal do Pará, 2024-07-04) OLIVEIRA, Elaine Cristina dos Santos Cunha de; ALVES, Rui Guilherme Cavaleiro de Macêdo; http://lattes.cnpq.br/1902384822911246
The research aimed to evaluate the physical aspects of the liquid phase and the solid phase, as well as to evaluate the performance of the decanters of an ETEI, located in Barcarena, through the mass balance and comparison of the TAH and the solids application rate (TAS). with project references and standards. Two of the four lines of ETEI decanters under study were monitored, on two consecutive days samples were collected from the liquid phase at the inlet and outlet, and from the solid phase, the ETEI sludge. The analyzes were carried out at the Laboratory of the Federal University of Pará (LAESA), together with the solids analyses, flow data was consulted using online monitoring instruments, as well as project data in technical files and a survey of normative and bibliographical references. With the results obtained, it was possible to conclude that the concentration of total solids is higher in Decanter 82E when compared to Decanter 82C. The result of the solids analysis also made it possible to evaluate the higher percentage in the portion of fixed suspended solids, that is, indicating a higher inorganic load characteristic. Regarding the mass balance, a generation of solids inside the decanters is observed due to the fact inherent to the process which refers to the presence of caustic soda in the raw effluent, aligned with the neutralization reaction that occurs in the medium through the use of sulfuric acid, forming sodium sulfate as a by-product of the treatment process, therefore this increase in solids is expressed in terms of dissolved solids. Regarding the assessment of the TAH observed in the monitored data, it was higher than the minimum indicated by Metcalf & Eddy (1991), but it remained in line with the design reference, compatible with the behavior of flows at low load. And in this same comparative logic, the TAS evaluation remained in both decanter 82C and 82E at a rate lower than the minimum indicated by Metcalf & Eddy (1991)
Acesso aberto (Open Access)
Produção de biogás e energia elétrica a partir do efluente líquido da palma de óleo (Elaeis guineensis) no estado do Pará.
(Universidade Federal do Pará, 2022-12-27) CARDOSO, Ana Rosa Bezerra; ALVES, Rui Guilherme Cavaleiro de Macêdo; http://lattes.cnpq.br/1902384822911246
In this work, we intend to demonstrate the importance of a biogas production system in order to optimize the use of liquid residues arising from the oil palm production process, a residue called POME (Palm oil mill effluent), which contains a high concentration of organic matter, being a potential source of biogas production for the generation of electricity and biofuel. In this context, the objective is to evaluate the process of producing biogas and electricity through a covered anaerobic lagoon based on the POME implemented by an industry in the State of Pará. For this, information was gathered about the industrial process, the type of effluent treatment that is used and its components, and the process of transforming liquid waste into a new product. Visits were carried out in the industry to learn about the facilities, monitor the operation of the system and the operation of the equipment used to capture biogas and convert it into electricity. Data regarding the COD, pH and temperature parameters that are used for the operational control carried out in the lagoon were made available. The system started operating in February/2021, but the data referred to the period from May/2021 to April/2022. The average values obtained in the operation of the system referring to the pH was 7.43 and the temperature of 38.30 °C with a VOC of 24.73 kgCOD/m³.day. The anaerobic lagoon showed a COD removal efficiency of approximately 91% and an average production of 139.04 m3 /day of methane. The methane produced from the industry's POME generated an average of 28.01 MWh of electricity in the aforementioned period, which were used to power the industrial plant. In view of the results analyzed, the viability of using the liquid effluent from the processing of the oil palm fruit for the generation of biogas and electricity is confirmed, thus contributing to the improvement of the quality of the final effluent.

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