Parasite ova and cysts in waste stabilization ponds

Abstract Waste stabilization ponds are frequently considered as being effective for the removal of intestinal parasites while conventional wastewater treatment processes are not. Over an 18-month period grab samples from the stabilization pond system in Grand Cayman, B.W.I., with a total nominal retention period of 23 days, were analysed for the presence of Necator americanus, Trichuris trichiura, Ascaris lumbricoides and Giardia lamblia . Of the inflow samples, 39% were found to be positive for at least one of the parasites while only the eggs of Necator americanus were identified in 44% of the effluent samples.

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