Título principal
Avaliação Quantitativa de Risco Microbiológico para o Reciclo de Esgotos Tratados no Cultivo de Arroz Irrigado [recurso eletrônico] / Giullia Birollo Alberton ; orientadora, Maria Elisa Magri
Data de publicação
2024
Descrição física
228 p. : il.
Nota
Disponível somente em versão on-line.
Dissertação (mestrado) – Universidade Federal de Santa Catarina, Centro Tecnológico, Programa de Pós-Graduação em Engenharia Ambiental
Inclui referências.
Avaliação Quantitativa de Risco Microbiológico para o Reciclo de Esgotos Tratados no Cultivo de Arroz Irrigado [recurso eletrônico] / Giullia Birollo Alberton ; orientadora, Maria Elisa Magri
Data de publicação
2024
Descrição física
228 p. : il.
Nota
Disponível somente em versão on-line.
Dissertação (mestrado) – Universidade Federal de Santa Catarina, Centro Tecnológico, Programa de Pós-Graduação em Engenharia Ambiental
Inclui referências.
Assunto
Engenharia ambiental
Responsabilidade
Alberton, Giullia Birollo
Magri, Maria Elisa
Universidade Federal de Santa Catarina. Programa de Pós-Graduação em Engenharia Ambiental
Idioma
Português
Engenharia ambiental
Responsabilidade
Alberton, Giullia Birollo
Magri, Maria Elisa
Universidade Federal de Santa Catarina. Programa de Pós-Graduação em Engenharia Ambiental
Idioma
Português
Abstract: In Brazil, although there are reuse projects implemented, there is still great potential to be explored, especially in agriculture, which is the sector that most consumes water in the country. Despite its benefits, the use of treated sewage can cause harm to human health, depending on the quality of the effluent and its intended use. Given the large water consumption by rice cultivation and its potential for reuse, this research aims to do a quantitative microbial risk assessment to evaluate the health risk of farmers in irrigated rice cultivation with treated wastewater in the State of Santa Catarina. The risk assessment analyzed exposure due to the activity of walking inside rice fields for maintenance (Scenario A) and immersing hands in rice paddies (Scenario B). Scenarios without (Scenario 1) and with prior reservation (Scenario 2) of the treated effluent were also evaluated. The study was conducted using monitored data of E. coli in the effluent provided by the sanitation company responsible for the Wastewater Treatment Plants (WWTPs). The technological routes of the selected WWTPs were: Trickling Filter with Physical-Chemical Treatment and Disinfection (FPB+FQ+D), Extended Aeration Activated Sludge (LAP), and Upflow Anaerobic Sludge Blanket with Submerged Aerated Biofilter (UASB+BAS). Through the historical series data of effluents from each technologie, probability distribution curves were characteristic. Risk quantification was carried out for the pathogens Rotavirus, Campylobacter and Cryptosporidium using the @risk software through Monte Carlo simulations with 10,000 iterations. The study indicated that exposure from walking within the rice paddies and the pathogen Rotavirus represent, respectively, the activity and pathogen with the highest risk for the practice of reuse in rice cultivation. With the results obtained, it is concluded that prior storage is an important strategy for risk mitigation. The median annual infection risk results for Rotavirus in the scenario with prior storage and exposure from walking in the rice paddies (Scenario 2A) were: 0.01% for the FPB+FQ+D technological route, 0.04% for LAP, and 0.09% for UASB+BAS. Therefore, the only technological route with an annual infection risk within the limits considered acceptable by the WHO in this scenario is the FPB+FQ+D route, which includes a disinfection step. However, for the average annual infection risk across all studied scenarios, the risk was higher than that considered acceptable by WHO, highlighting significant variability in the concentration data of E. coli in the treated effluent. It is concluded that disinfection and prior storage are essential steps in the implementation of WWTPs aimed at effluent reuse in rice cultivation. Additionally, continuous monitoring and proper operation of the WWTP are crucial to ensure greater safety against variations in pathogen concentration in the treated effluent.