WATER TREATMENT WITH SODIS FOR RIBEIRINHAS COMMUNITIES

Abstract

Copyright ©2016 by authors and Institute of Technology Galileo of Amazon (ITEGAM). This work is licensed under the Creative Commons Attribution International License (CC BY 4.0). http://creativecommons.org/lic enses/b y/4.0 / ABSTRACT SODIS (Solar Water Disinfection) is an alternative to traditional methods of water disinfection and consists of exposing under the sun containers filled with water to be disinfected. This research aims to check SODIS efficiency in the representative context of riverine communities which use rainwater for drinking. The analysis included turbidity, pH, temperature, E. coli and total coliforms (MPN/100ml). The samples were raw water at 0h; after 6 hours of sun exposure; and water 24 hours after the use of SODIS for identifying bacterial regrowth. We conducted an experiment on sunny and cloudy days, analyzing the base supporting the bottles and half-face painted bottles. We obtained the following results: a) the experiment conducted in sunny day decreased from 4 to 0NMP/100 ml coliform bacteria and E. coli, resulting in 100% inactivation, without regrowth after 24 hours; the temperature was 55 ° C on average and maximum of 57 ° C in bottles painted with half face black; b) on cloudy day SODIS decreased total coliforms and E. coli from 4 to 0NMP/100 mL after 6 hours of exposure; the temperature was 45°C and maximum 47°C in painted bottles. The results indicated that the metal surface had no positive influence on the water temperature; the pH remained on average 7.3; Turbidity was 2UNT. We concluded that the SODIS method is effective for the household treatment of rainwater.