Optimum Conditions for Enhancing Chitosan-Assisted Coagulation in Drinking Water Treatment

Coagulant aids are useful chemicals that enhance the efficiency of coagulation sedimentation treatment. For this purpose, it is necessary to choose safe avoid various risks health those who use treated water. The chitosan, an abundant natural polysaccharide, as a coagulant aid significant not only for water treatment but also effective utilization unused resources, which mostly wasted. We experimentally determined optimal conditions using chitosan in most efficient was identified adding at stage rapid stirring after addition accelerated initial dispersion. When used with main polyaluminum chloride (PACl), concentration 0.8 mg L−1, estimated ζ potential showing isoelectricity concentration. Determining minimum valid estimating optimum extension method much higher turbidity, seen wastewater. Thus, potential-based prediction even when effect sweep coagulation, normally induced negligible. superiority PACl combination demonstrated by comparing situ-observed process cases other coagulants and direct time-series observation process. found make flocs easier remove because resulted largest mass fraction resultant floc on bottom vessel. In study, be viable current popular aluminum sulfate polyacrylamide. Replacing polyacrylamide contributed reducing risk