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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Performance of a small-scale wastewater treatment plant for removal of pathogenic protozoa (oo)cysts and indicator microorganisms

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Autor(es):
Medeiros, Raphael Correa [1] ; Daniel, Luiz Antonio [2] ; de Oliveira, Gabriela Laila [2] ; Hoffmann, Maria Teresa [2]
Número total de Autores: 4
Afiliação do(s) autor(es):
[1] Univ Fed Santa Maria, Dept Engn & Environm Technol, Linha 7 Setembro, BR 386, Km 40, BR-98400000 Frederico Westphalen, RS - Brazil
[2] Univ Sao Paulo, Sao Carlos Sch Engn, Hydraul & Sanitat Dept, Sao Carlos, SP - Brazil
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: ENVIRONMENTAL TECHNOLOGY; v. 40, n. 26, p. 3492-3501, NOV 23 2019.
Citações Web of Science: 1
Resumo

The protozoa Giardia and Cryptosporidium are associated with numerous outbreaks of waterborne diseases worldwide. This study aimed to evaluate the concentration of Giardia spp. cysts, Cryptosporidium spp. oocysts, total coliforms, Escherichia coli and Clostridium perfringens in raw wastewater and their removals at UASB reactor, activated sludge system (operated conventionally and extended aeration) and slow sand filtration. Giardia spp. cysts were present in 100% and Cryptosporidium spp. oocysts in 31.4% of the analysed wastewater samples. The UASB reactor followed by activated sludge system obtained approximately 2.0 log of removal for total coliforms and E. coli, whereas for C. perfringens and Giardia spp. cysts, it obtained 1 log. There was a high percentage of (oo)cysts still viable after secondary treatment, therefore, the risk of contamination of water courses and, consequently, for public health is considerable. However, after tertiary filtration, no (oo)cysts were found in any of the filtered effluent samples, being a good option for future reuse. Seasonal variations did not affect the concentrations and removals of microorganisms observed. Lack of correlations of concentrations of indicator microorganisms and (oo)cysts raise caveats and doubts regarding the true microbiological quality when using only indicator microorganisms. (AU)

Processo FAPESP: 10/07902-1 - Avaliação do comportamento dos protozoários Giardia spp. e Cryptosporidium spp. e de microrganismos indicadores frente ao tratamento de esgoto e após o lançamento no corpo receptor
Beneficiário:Raphael Corrêa Medeiros
Linha de fomento: Bolsas no Brasil - Doutorado
Processo FAPESP: 11/08653-8 - Remoção e inativação de microrganismos indicadores, cistos de Giardia spp. e de oocistos de Cryptosporidium spp. em sistemas de tratamento de esgoto sanitário
Beneficiário:Luiz Antonio Daniel
Linha de fomento: Auxílio à Pesquisa - Regular