The goal of this work was to quantify the effectiveness of wastewater treatment systems in removing Giardia cysts. For this, the quantity and the viability of the cysts recovered from primary and digested sludge were studied. The digestion treatment has no effect on the number of cysts recovered, however it affects their viability.

Giardia, wastewater sludge, quantification, viability, health risks, effect of sludge treatments
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