Under chemical–DAF system best conditions, namely 4.5 to 5.5
pHcoag (Fig. 3a), 1.32±0.19 Fe/P molar ratio associated with 1.0 mg L−1
cationic polymer (Fig. 3b), 20% R (Fig. 3c) and 10 cmmin−1 Vflot (Fig. 3d), 81±8% TCOD, N99% TP, 65±25% TSS and 93±3% turbidity
removal efficiencieswere obtained