Fig. 7

Effect of settling time on removal efficiency of Disperse red 60 and Reactive blue 19 dyes. (Initial pH = 11, Alcea rosea concentration = 200 mg/L and initial dye concentration = 40 mg/L for Disperse experiments; initial pH = 11, concentration = 250 mg/L and initial dye concentration = 20 mg/L for Reactive experiments; rapid-mixing speed = 180 rpm; rapid-mixing time = 3 min; slow-mixing speed = 10 rpm; slow-mixing time = 15 min)