Efficiency of two sewage treatment systems (activated sludge and natural lagoons) for helminth egg removal in Morocco

The overall removal efficiency of eggs in the treatment plants ranged from 100% in the WWTP of Marrakech using activate sludge to 94.97% in the WWTP of Chichaoua using natural lagoons. These results were discussed according to health risk and the cost-effectiveness of both wastewater treatment techniques.