Abstract
An unknown parcel of the planet water is contaminated by chemical and/or biological agents. Human and other animals excreta have been associated to many infectious diseases that can be disseminated through contaminated water. Enteric bacteria and other pathogens can cause gastroenteritis, cholera, systemic infections, among others. Once in the environment, these microorganisms can persist for large periods of time and under certain conditions can even replicate, increasing their number. This paper aimed the research and evaluation of survival rates for total coliforms, fecal coliforms (Escherichia coli) and Pseudomonas aeruginosa in natura water samples from Passaúna and Iraí barrages and Iguaçú River, in Curitiba, Paraná. Colimetric analysis of water samples were performed by the membrane filtration method 64 Freitas MP, Blaskowski MMM, Dalke CR, Dalzoto PR, Pimentel IC. Estud and P. aeruginosa research was assayed using the multiple tubes method in Asparagin and Acetamyde Broth. Confirmatory tests such as catalase presence, citocrome oxidase test and pigment P (pyocyanin) production were also performed. It was observed the occurrence of total coliforms in water samples from Iguaçú River for approximately 50 days, while in Iraí and Passaúna barrages, the periods were 35 and 14 days, respectively. Fecal coliforms were found for about 35 days in samples from Iguaçú River and Iraí barrage, while in Passaúna barrage only for 14 days. P. aeruginosa persisted for approximately 63 days in all the water samples assayed. The higher persistence rate observed in P. aeruginosa can be related to an antagonism towards total and fecal coliforms, which had their populations decreased.
Highlights
An unknown parcel of the planet water is contaminated by chemical and/or biological agents
It was observed the occurrence of total coliforms in water samples from Iguaçú River for approximately 50 days, while in Iraí and Passaúna barrages, the periods were 35 and 14 days, respectively
It was observed the occurrence of total coliforms in water samples from Iguaçú River for approximately 50 days, while in Iraí and Passaúna barrages the periods were 35 and 14 days, respectively
Summary
An unknown parcel of the planet water is contaminated by chemical and/or biological agents. This paper aimed the research and evaluation of survival rates for total coliforms, fecal coliforms (Escherichia coli) and Pseudomonas aeruginosa in natura water samples from Passaúna and Iraí barrages and Iguaçú River, in Curitiba, Paraná. It was observed the occurrence of total coliforms in water samples from Iguaçú River for approximately 50 days, while in Iraí and Passaúna barrages, the periods were 35 and 14 days, respectively. Este trabalho teve como objetivo a pesquisa e a determinação do tempo de sobrevivência de coliformes totais, fecais (Escherichia coli) e Pseudomonas aeruginosa em amostras de água in natura das barragens dos rios Irai, Passaúna e Iguaçú, em Curitiba, Brasil. Observou-se a presença de coliformes totais em amostras do Rio Iguaçú por aproximadamente 50 dias, enquanto nas barragens dos rios Iraí e Passaúna, 35 e 14 dias, respectivamente. These microorganisms can persist for large periods of time and under certain conditions can even replicate, increasing their number [5]
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