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A partir de 1970 iniciou-se a modelação computacional de drenagem de águas residuais, como instrumento de planeamento, projeto, análise e operação de sistemas. Desde então foram desenvolvidos diversos modelos destinados a simular o comportamento e processos que ocorrem numa estação de tratamento de águas residuais (ETAR). O presente estudo teve como objetivo modelar e simular o tratamento biológico de uma ETAR localizada no norte de Portugal, visando avaliar e otimizar o desempenho do processo biológico. A construção do modelo foi realizada com recurso do software SUMO, versão 2019, desenvolvido pela empresa Dynamita. O modelo foi utilizado para avaliar a qualidade do efluente em função de alterações de caudal e composição do afluente, de alterações de condições operatórias e do uso de coagulantes químicos alternativos. O modelo desenvolvido para a ETAR apresentou um desempenho muito similar ao do sistema real em relação aos parâmetros de Carência Química de Oxigénio (CQO), Carência Bioquímica de Oxigénio (CBO5), Sólidos Suspensos Totais (SST) e Azoto Total (NT). A inclusão da adição de coagulantes químicos convencionais permitiu obter também uma excelente resposta do modelo relativamente à eficiência de remoção de Fósforo Total (PT). As alterações nas condições operatórias permitiram concluir a ETAR está a ser operada com os níveis ótimos de Oxigénio Dissolvido (OD). Além disso, os resultados do modelo demonstram que a ETAR tem capacidade para responder as variações de 50% e 200% do caudal afluente, porém quando se dobra as concentrações de CQO, NT e PT afluentes a eficiência de remoção de NT diminui em 5%, devido à remoção incompleta deste nutriente.
Since 1970, computer modeling of wastewater drainage has started, as a tool for planning, design, analysis and operation of systems. Since then, several models have been developed to simulate the behavior and processes that occur in a wastewater treatment plant (WWTP). The present study aimed to model and simulate the biological treatment of a WWTP located in the north of Portugal, aiming to evaluate and optimize the performance of the biological process. The construction of the model was performed using the SUMO software, version 2019, developed by the company Dynamita. The model was used to evaluate the quality of the effluent due to changes in the flow and composition of the tributary, changes in operating conditions and the use of alternative chemical coagulants. The model developed for the WWTP presented a performance very similar to that of the real system in relation to the parameters of Chemical Oxygen Demand (COD), Biochemical Oxygen Demand (CBO5), Total Suspended Solids (SST) and Total Nitrogen (NT). The inclusion of the addition of conventional chemical coagulants also allowed to obtain an excellent response of the model regarding the removal efficiency of Total Phosphorus (PT). The changes in the operating conditions allowed to conclude the WWTP is being operated with the optimal levels of Dissolved Oxygen (DO). In addition, the model's results demonstrate that the WWTP is capable of responding to variations of 50% and 200% of the affluent flow, however when doubling the concentrations of affluent COD, NT and PT, the removal efficiency of NT decreases by 5%, due to the incomplete removal of this nutrient.
Since 1970, computer modeling of wastewater drainage has started, as a tool for planning, design, analysis and operation of systems. Since then, several models have been developed to simulate the behavior and processes that occur in a wastewater treatment plant (WWTP). The present study aimed to model and simulate the biological treatment of a WWTP located in the north of Portugal, aiming to evaluate and optimize the performance of the biological process. The construction of the model was performed using the SUMO software, version 2019, developed by the company Dynamita. The model was used to evaluate the quality of the effluent due to changes in the flow and composition of the tributary, changes in operating conditions and the use of alternative chemical coagulants. The model developed for the WWTP presented a performance very similar to that of the real system in relation to the parameters of Chemical Oxygen Demand (COD), Biochemical Oxygen Demand (CBO5), Total Suspended Solids (SST) and Total Nitrogen (NT). The inclusion of the addition of conventional chemical coagulants also allowed to obtain an excellent response of the model regarding the removal efficiency of Total Phosphorus (PT). The changes in the operating conditions allowed to conclude the WWTP is being operated with the optimal levels of Dissolved Oxygen (DO). In addition, the model's results demonstrate that the WWTP is capable of responding to variations of 50% and 200% of the affluent flow, however when doubling the concentrations of affluent COD, NT and PT, the removal efficiency of NT decreases by 5%, due to the incomplete removal of this nutrient.
Descrição
Mestrado de dupla diplomação com a UTFPR - Universidade Tecnológica Federal do Paraná
Palavras-chave
Águas residuais Tratamento Biológico Simulação matemática SUMO