Evaluation of the efficiency of the SODIS method in the disinfection of water for human consumption in Pelotas/RS
DOI:
https://doi.org/10.6008/CBPC2179-6858.2018.007.0015Keywords:
SODIS, Solar Disinfection, Water Treatment, Drinking WaterAbstract
The contaminated by pathogenic microorganisms water causes several waterborne diseases, so its disinfection therefore is necessary. SODIS is a cheap and simple water disinfection method that uses solar radiation, and it can be applied in disadvantaged communities. The present work aimed to apply SODIS with different exposure times both on cloudy and sunny days in order to ascertain the best time of exposure in each weather condition. Raw water samples with turbidity lower than 30 NTU were exposed to solar radiation in PET transparent bottles for 6, 7 and 8 hours on sunny days, and for 8, 29 and 32 hours on cloudy days. After every exposure time, the microbiological quality of the water samples was analyzed concerning total coliforms, Escherichia coli and fecal coliforms. The work’s results were satisfactory and the method had 100% efficiency concerning the analyzed microorganisms’ inactivation. On sunny days the suitable disinfection level occur in 8 hours of solar energy exposure whereas on cloudy days that time was 32 hours, being these the best exposure time in each weather condition.
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