FeSO4 in 20% Fe2(SO4)3with Fe2+:Fe3+ molar ratio of 1:2 was used. Applied dose was 0.97 mg (density 1.55 g/L, pH 0.8–1.1, 69.8 Fe3+g/L,25.5 Fe2+ g/L) of coagulant./L of wastewater.
FeSO4 in 20% Fe2(SO4)3with Fe2+:Fe3+ molar ratio of 1:2 was used. Applied dose was 0.97 mg (density 1.55 g/L, pH 0.8–1.1, 69.8 Fe3+g/L,25.5 Fe2+ g/L) of coagulant./L of wastewater.