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

Autor(es)

Medeiros, Raphael Correa ^[1] ; Daniel, Luiz Antonio ^[2]

Afiliação do(s) autor(es)

^[1] Univ Fed Santa Maria, Dept Ciencias Agron & Ambientais, BR-98400000 Frederico Westphalen, RS - Brazil

^[2] Univ Sao Paulo, Dept Hidraul & Saneamento, Escola Engn Sao Carlos, Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ACTA SCIENTIARUM-TECHNOLOGY; v. 37, n. 2, p. 203-209, 2015.
• Citações Web of Science: 4

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. (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
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 07/08499-3 - Resistência de Escherichia coli, Clostridium perfringens e Giardia sp à desinfecção sequencial com ozônio-radiação ultravioleta e cloro-radiação ultravioleta
• Beneficiário: Luiz Antonio Daniel
• Modalidade de apoio: Auxílio à Pesquisa - Regular