Table 4 Overview of results on Taenia spp. egg presence in the influent/effluent of wastewater treatment systems.
Country | Wastewater treatment system | Egg recovery | Influent | Effluent | Year of publication | Reference |
|---|---|---|---|---|---|---|
Morocco | Activated sludge and natural lagoon | Modified Bailenger method (sedimentation, centrifugation, flotation and McMaster) | 5.28 eggs/l (N = 6) and 0 eggs/L (N = 6) | 0 eggs/l (N = 6) and 0 eggs/L (N = 6) | 2018 | [110] |
Colombia | Series of anaerobic, facultative and maturation ponds | Modified Bailenger method | 63 helminth eggs/l (N = 8) | 0 eggs/l (N = 8) | 2002 | [111] |
Iran | Activated sludge Natural lagoons | Modified Bailenger method | Low number present in 2 of 8 plants (3 and 1.25 eggs/l) (N = 16/plant) | < 1 egg/l (N = 16/plant) | 2006 | [112] |
Morocco | Stabilization ponds | Bailenger method | 0.1 eggs/l (N = 48) | 0 eggs/l (N = 48) | 2000 | [113] |
Tunisia | Activated sludge Stabilization ponds | Bailenger method | From 28 to 208 eggs/l (N = 174) | From 17 to 52 eggs/l (N = 174) | 2009 | [88] |
Colombia | Anaerobic biodigestors | Filtration, sedimentation, centrifugation and recovery by Sheather and McMaster method | Eggs in 10% of samples (N = 80) | Eggs in 10% of samples (N = 80) | 2012 | [114] |
South Africa and Lesotho | Centralized plant Decentralized plant | Sieving, sedimentation and flotation | 6.4–29.6 eggs/l to 2.3 eggs/l (N = 55) | 1.4 to 8.4 eggs/l – 0.25 eggs/L (N = 55) | 2018 | [87] |
Bolivia | Facultative pond followed by maturation pond | Centrifugation, flotation and biphasic separation | 306–3006 eggs/l (N = 3) | 45 eggs/L (N = 3) | 2013 | [115] |
Tunisia | Activated sludge Natural lagoons | Modified Bailenger method | Taeniid eggs in 85% of samples (N = 117) | Taeniid eggs in 30% of samples (N = 117) | 2018 | [89] |