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. Author manuscript; available in PMC: 2022 Jul 5.
Published in final edited form as: Chemosphere. 2021 Jan 23;274:129720. doi: 10.1016/j.chemosphere.2021.129720

Table 1. Scenarios for dynamic simulations.

Control strategies Initial floc retention factor at steady-state Initial flocculent sludge fraction Dynamics of floc retention factors in the studied periods
DO control (0.2 g O2.m-3) 0.99 19% Inline graphic (Sudden drop from initial values to 0)
DO control (0.6 g O2.m-3) 0.92 3.5%
Constant Qair (23300 m3.d-1) 0.99 19%
Constant Qair (24600 m3.d-1) 0.92 3.7%
Effluent NH4+ control (12.5 g N.m-3) 0.99 19%
Effluent NH4+ control (14 g N.m-3) 0.92 3.7%
DO control (0.9 g O2.m-3) 0 0.3% Inline graphic (fluctuating between 0 and 0.999)
Constant Qair (25600 m3.d-1) 0 0.3%
Effluent NH4+ control (14 g N.m-3) 0 0.3%