Following that, beakers were gently stirred
(35 rpm) for 15min, enhancing the flocculation process. Finally, formed
flocs were allowed to settle (without stirring) for 15 min (sedimentation
process). Images of the three jar test steps are shown in Fig. 2. At
the end of the process, supernatant liquid samples were taken from
each beaker; turbidity and pH were measured with a HI93703 Hanna
Instruments Turbidimeter and a Crison 506pH-meter, respectively