Occurrence and removal of protozoan cysts and helminth eggs in the Médéa sewage treatment plant (south-east of Algiers)

: One of the most important quality characteristics associated with wastewater reuse in discharging in water bodies is the microbial quality. This study aimed to determine the efficiency of Medea wastewater treatment plant (conventional activated sludge system) in the removal of protozoan cysts and parasitic eggs. This study was carried out during four months and samples were collected at weekly intervals from influent and effluent of the wastewater plant. In order to determine the concentration of ova, samples were analyzed according to Bailenger method. The wastewater treatment plant (WWTP) of Medea has removed 88.9–100% of parasite eggs and more than 95% of protozoan cysts.