Qualidade do efluente da estação de tratamento de esgotos Ponta Negra - avaliação das garantias Fuzzy e probabilística (distribuições Gama e Lognormal)

• Autor(a) principal: Freitas, Anderson Douglas Maia de
• Data de Publicação: 2020
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Federal do Ceará (UFC)
• Texto Completo: http://www.repositorio.ufc.br/handle/riufc/62781
• topic: Garantia Fuzzy; Qualidade dos efluentes; Distribuição gama; Distribuição lognormal

The high growth of the Brazilian population is accompanied by the increase in consumption and the generation of different types of waste, such as sewage. As a result, it is increasingly important to have reliable techniques for the treatment and disposal of this waste, in order to prevent contamination of water resources and avoid compromising the availability of drinking water for the population. To evaluate the safety of the sewage treatment plant (STP) in Ponta Negra, located in Natal, Rio Grande do Norte, the present work seeks to analyze the parameters of effluent discharge in a specific period and determine the guarantee given by the STP in regarding the launch standards required by law. To observe different scenarios, three methodologies were applied in order to obtain the guarantees of the parameters. They were: Fuzzy warranty, gamma distribution and lognormal distribution. The parameters studied were: biological oxygen demand (BOD), chemical oxygen demand (COD), total ammonia nitrogen (TAN), potential of hydrogen (pH) and thermotolerant coliforms (TTC). For some parameters, such as pH, the methodologies were in agreement, for others, disagreements. The study data were collected between 2014 and 2017, adding up to a total of 24 samples. From the results, it is possible to conclude that most of the samples analyzed were outside the standard required by current environmental legislation.