“…As part of the initial design, extensive modeling of unit processes at the plant was performed using clarifier models (Wahlberg et al, 1997;Bratby et al, 2001), trickling filter model (Logan et al, 1987(Logan et al, , 1987a, NTF model (Parker et al, 1995) and Brown and Caldwell's solids contact and aeration model. These separate models were integrated into a plant-wide mass balance model.…”