Tratamento do lodo e produção do biossólido de fossas verdes no semiárido

• Ano de defesa: 2022
• Autor(a) principal: Bellizzi Júnior, Márcio José
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Palavras-chave em Português: resolução conama nº 498/2020; E. coli; fossa.; lodo fecal; Saneamento rural
• Link de acesso: http://www.repositorio.ufc.br/handle/riufc/65957

The Green Fossa or Evapotranspiration Basin is an option for treating domestic sewage that represents a social technology based on ecological sanitation, in order to enhance the natural resources of the place where it is located. In line with the improvement of this social technology, the present work aims to evaluate, under the conditions of the Brazilian semiarid region, the process of sanitizing fecal sludge from green pits, through sun exposure in uncovered drying beds. Sludge from three pits were analyzed and treated from October to December 2020. The pits, from which the samples were taken, were built in the rural area of ​​the municipality of Madalena, Ceará, in 2010 and had never been exhausted until the present research was carried out. , despite being fully operational. Two of the pits were connected to single-family homes and one to a community health post. The fecal sludge samples analyzed showed solid consistency. The sludge is stable, with a volatile solids to total solids ratio (SV/ST) of less than 0.40. In up to 45 days of hygienization, in the climatic conditions of the dry season of the Brazilian Serniárido, all samples of fecal sludge had reached the microbiological criterion of E. coli less than 3 log NMP/g of ST. Therefore, the cleaning process proved to be, for the study region, efficient for obtaining Class A biosolids, according to CONAMA Resolution No. 498/2020.