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The Infectivity of Giardia lamblia Cysts in Wastewater Effluents Before and After UV treatment

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Giardia lamblia is a protozoan parasite that has been frequently associated with waterborne disease. Several waterborne Giardiasis outbreaks have been linked with discharge of wastewater effluents into surface water that serves as a source water of drinking water supply. Little is known about the infectivity of G. lamblia cysts present in UV treated wastewater effluents and the potential public health concerns. In this study, the infectivity of G. lamblia cysts recovered and concentrated from wastewater effluents both upstream and downstream of operating UV reactors in three full-scale UV reactors in Western Canada was assessed using the Mongolian gerbil model. Cysts were detected in all three wastewater effluents. Infectivity of the cysts present in the wastewater effluents was reduced by UV irradiation, but was not completely eliminated. However, only weak infections were detected in gerbils inoculated with cysts collected from both upstream and downstream of the UV reactors.

Document Type: Research Article


Publication date: January 1, 2005

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  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

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