Avaliação da utilização de colifagos como indicadores virais a partir da análise de enterovírus e adenovírus em efluentes tratados por diferentes processos biológicos

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

2010

RESUMO

Domestic sewage contains a high amount of bacteria and other pathogens and non pathogens that are discharged into water bodies. Contamination of water by the presence of pathogenic bacteria and viruses, brings undesirable consequences, especially for public health. The objective of this work was to evaluate the possibility of using analysis of coliphages as viral indicator. Samples of raw sewage, treated effluent by UASB reactor and by activated sludge, from Wastewater Treatment Systems São João Navegantes, Porto Alegre, were collected during the period of june/2006 to june/2007. Physical, chemical and microbiological analyzes, namely BOD5, turbidity, total solids, quantification of total coliforms, fecal coliforms and coliphages were performed in 99 samples, following the techniques described in APHA 2005. The presence of enteric viruses was tested on 36 samples. The technique of concentration by filtration-elution and ultra-centrifugation was used for this purpose. Subsequently, purification and infectivity test was performed. The samples were tested to nested PCR and RT-PCR to verify the presence of adenovirus and enterovirus, respectively. In 36 samples tested, the presence of enteroviruses was confirmed in only 5.56% of the samples, and adenovirus, in 16.67% of the samples. No significant correlation was found among coliform bacteria and coliphages, and also between the presence of coliphages and physical and chemical parameters. The independence found between viruses and bacteria indicates the need for joint monitoring of both microrganisms. The behavior of coliphages was observed to follow the path described in the literature about enteric viruses in relation to seasonality. There was observed a low efficiency in terms of microorganisms removal, emphasizing the need for a tertiary treatment to ensure the microbiological quality of the effluents tested. Relations between coliphages and enteric viruses were not able to be analyzed, due to inconclusive data obtained in this work.

ASSUNTO(S)

tratamento de esgoto wastewater treatment coliformes coliphages adenovírus coliform bacteria enteric viruses enterovirus sazonalidade physical and chemical parameters indices : qualidade da agua seasonality

ACESSO AO ARTIGO

Documentos Relacionados