| Autor: |
Oliveira TJJ; Laboratório de Saneamento Ambiental, Escola de Minas, Campus Morro do Cruzeiro, Universidade Federal de Ouro Preto, Ouro Preto, 35400-000, Brazil. jardim.thaissa@gmail.com., Santiago ADF; Laboratório de Saneamento Ambiental, Escola de Minas, Campus Morro do Cruzeiro, Universidade Federal de Ouro Preto, Ouro Preto, 35400-000, Brazil., Lanna MCDS; Instituto de Ciências Exatas e Biológicas, Campus Morro do Cruzeiro, Universidade Federal de Ouro Preto, Ouro Preto, 35400-000, Brazil., Fongaro G; Laboratório de Virologia Aplicada, Departamento de Microbiologia, Imunologia e Parasitologia (MIP), Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, Florianópolis, 88037-000, Brazil., Milagres NL; Laboratório de Saneamento Ambiental, Escola de Minas, Campus Morro do Cruzeiro, Universidade Federal de Ouro Preto, Ouro Preto, 35400-000, Brazil., Cunha TR; Laboratório de Saneamento Ambiental, Escola de Minas, Campus Morro do Cruzeiro, Universidade Federal de Ouro Preto, Ouro Preto, 35400-000, Brazil., Corrêa ALI; Environmental Engineering Department, University of Oulu, 90570, Oulu, Finland. |
| Abstrakt: |
The Brazilian Biodigester Septic Tank (BBST) is an on-site appropriate technology for blackwater treatment, which was developed to yield an effluent suitable for agricultural use. Although several studies have proven its efficacy for secondary blackwater treatment, there are few published studies about the microbiological quality of its effluent, and most of them focus on the quantification of total or thermotolerant coliforms. This study evaluates the performance of a BBST for the removal of human adenovirus (HAdV), Enterococcus spp., Salmonella sp., and Escherichia coli. The results further clarify the safety and risks associated with the reuse of the obtained effluent. The full-scale system consists of three 1.2 m 3 interconnected reactors, with a blackwater input of 0.045 m 3 /day, and hydraulic retention time of 80 days. Six sample campaigns were performed at different stages of the monthly operating cycle. The system presented an average removal efficiency of 5.09 log 10 for E. coli, 3.22 log 10 for Enterococcus spp., 1.2 log 10 for Salmonella sp., and 3.0 log 10 for HAdV. According to the World Health Organization standards, the obtained effluent is suitable for subsurface irrigation, and for use in crops that develop distant from the soil or highly mechanized crop systems. |
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