Abstract
Polluted water with parasitic protozoa (Giardia lamblia and Entamoeba histolytica) causes many serious health problems like diarrhea and gastrointestinal diseases. The present study investigated the applicability of solar energy for disinfection of parasitic protozoa in polluted water. One-side blackened bottles of two liters volume each were continuously exposed to direct sun light for about seven hours which maintained water temperature in the range of 50-60 °C that was enough for destroying most of the encysted parasitic protozoa. Complete destruction of the encysted protozoa was achieved in both bottles facing south and those vertically in position at 60 °C with an ambient temperature of 40 °C. The influence of water temperature against the viability of these two cysts was found to be highly significant (P < 0.001) in both cases particularly those of Giardia where its regression coefficient equal -1.5 as compared to that of Entamoeba (-1.27). The low cost and operational simplicity of this study make it affordable and usable. It is more useful in rural areas where other sources of energy like electricity and gas are not easily available.
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