Study of sequential disinfection for the inactivation of protozoa and indicator microorganisms in wastewater

Autores

  • Raphael Corrêa Medeiros Universidade Federal de Santa Maria Autor
  • Luiz Antonio Daniel Universidade de São Paulo Autor

DOI:

https://doi.org/10.4025/actascitechnol.v37i2.24950

Palavras-chave:

Chlorine, Ultraviolet radiation, Giardia, Clostridium perfringens, Total coliforms, Synergism.

Resumo

Sewage disinfection has the primary objective of inactivating pathogenic organisms to prevent the dissemination of waterborne diseases. This study analyzed individual disinfection, with chlorine and ultraviolet radiation, and sequential disinfection (chlorine-UV radiation). The tests were conducted with anaerobic effluent in batch, in laboratory scale, with two dosages of chlorine (10 and 20 mg L-1) and UV (2.5 and 6.1 Wh m-3). In addition, to guarantee the presence of cysts in the tests, 104 cysts per liter of Giardia spp. were inoculated. The resistance order was as follows: E. coli = Total Coliforms < Clostridium perfringens < Giardia spp.. Furthermore, synergistic effects reached 0.06 to 1.42 log of inactivation in sequential disinfection for both the most resistant microorganisms.

 

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Biografia do Autor

  • Raphael Corrêa Medeiros, Universidade Federal de Santa Maria
    Professor Adjunto do Departamento de Ciências Agronômicas e Ambientais, na área de Saneamento Ambiental, dentro do curso de Engenharia Ambiental e Sanitária
  • Luiz Antonio Daniel, Universidade de São Paulo
    Hydraulics and Sanitation Department. São Carlos School of Engineering

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Publicado

2015-05-29

Edição

Seção

Engenharia Civil

Como Citar

Study of sequential disinfection for the inactivation of protozoa and indicator microorganisms in wastewater. (2015). Acta Scientiarum. Technology, 37(2), 203-209. https://doi.org/10.4025/actascitechnol.v37i2.24950

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