Quality of water sources used as drinking water in a Brazilian peri-urban area

Brazilian Journal of Microbiology

Maria Tereza Pepe Razzolini¹  Wanda Maria Risso Günther¹  Francisca Alzira Dos Santos Peternella¹  Solange Martone-rocha¹  Veridiana Karmann Bastos¹  Thaís Filomena Da Silva Santos¹  Maria Regina Alves Cardoso¹ 

[1] ,Universidade de São Paulo Faculdade de Saúde Pública São Paulo SP ,Brasil

关键词: Clostridium perfringens;    Escherichia coli;    Enterococcus;    peri-urban area;    drinking water;   

DOI  :  10.1590/S1517-83822011000200021

来源: SciELO

【 摘 要 】

The objective of this paper was to assess bacteriological quality of drinking water in a peri-urban area located in the Metropolitan Region of São Paulo, Brazil. A total of 89 water samples were collected from community plastic tanks and 177 water samples from wells were collected bimonthly, from September 2007 to November 2008, for evaluating bacteriological parameters including: Escherichia coli, Enterococcus and heterotrophic plate count (HPC). Clostridium perfringens was investigated in a subsample (40 samples from community plastic tank and 40 from wells). E. coli was present in 5 (5.6%) samples from community plastic tanks (2.0 - 5.1x10(4) MPN/100mL) and in 70 (39.5%) well samples (2.0 - 8.6x10(4) MPN/100mL). Thus, these samples were not in accordance with the Brazilian Regulation. Enterococcus was detected in 20 (22.5%) samples of the community plastic tanks (1 to 79 NC/100mL) and in 142 (80.2%) well samples (1 to >200 NC/100mL). C. perfringens was detected in 5 (12.5%) community plastic tanks samples and in 35 (87.5%) wells samples (2.2 to >16 MPN/100mL). HPC were above 500 CFU/mL in 5 (5.6%) waters from community plastic tanks. In wells samples, the HPC ranged from <1 to 1.6x10(4) CFU/mL. The residual chlorine did not attend the standard established in the drinking water legislation (0.2 mg/L), except in 20 (22.5%) samples. These results confirm the vulnerability of the water supply systems in this peri-urban area what is clearly a public health concern.

【 授权许可】

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