Prevalence and fate of Giardia cysts in wastewater treatment plants

Journal of Applied Microbiology
A M NasserM Revhun

Abstract

The present study was conducted to review factors affecting the prevalence and concentration of Giardia in raw wastewater. The removal and inactivation efficiency of Giardia by wastewater treatment technologies was also reviewed. Data published for the prevalence of Giardia in wastewater and the removal by wastewater treatment plants was reviewed. Giardia cysts are highly prevalent in wastewater in various parts of the world, which may reflect the infection rate in the population. In 23 of 30 (76.6%) studies, all of the tested raw wastewater samples were positive for Giardia cysts at concentrations ranging from 0.23 to 100 000 cysts l(-1). The concentration of Giardia in raw wastewater was not affected by the geographical region or the socio-economic status of the community. Discharge of raw wastewater or the application of raw wastewater for irrigation may result in Giardia transmission. Activated sludge treatment resulted in a one to two orders of magnitude reduction in Giardia, whereas a stabilization pond with a high retention time removed up to 100% of the cysts from wastewater. High-rate sand filtration, ultrafiltration and UV disinfection were reported as the most efficient wastewater treatment methods for removal and di...Continue Reading

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