Study of Escherichia Coli removal from polluted water by solar disinfection (SODIS)

Background and Aim : Microbial pollution in water resources is an important issue in the world because of high risks to humans and animals. So, the removal of microbial contaminations is necessary for access of water quality standard. Today, due to environmental friendly, have led researchers to focus on water disinfection using natural sunlight for water disinfection. This study was conducted to investigate the effect of solar radiation disinfection to treatment of polluted water for the purpose of domestic water supply.Methods : In this study, the performance of E. coli removal efficiency was evaluated using different containers (PET and Glass) and atmospheric temperature as experimental study. The disinfection rate of E. coli (k) of SODIS was calculated from the ratio of the start (C۰) and end (Ct) concentrations of E. coli, and the contact time (t), assuming first order disinfection kinetics.Results : Results of this study show that both PET and Glass bottles are capable to decrease of ۳۰۰ E.coli per milliliter to zero at ۶۰ min contact time. Experimental results showed that SODIS was an effective method to remove E. coli in water. No significant difference was observed in between glass and PET bottles for ۶۰ min contact time.Conclusion : The use of solar radiation technology is suitable for drinking water disinfection both at household level and at remote communities even for water with high turbidity and high organic matter concentrations.

کلیدواژه ها:

Solar disinfection ، E. coli ، Water Sources ، Water treatment