and slow agitation times in Jar test, as well as agitation intensity,
are less important than Tannin-based coagulant dosage for water
treatment.
During the experiments 6 and 14 the formation of bigger
flocks was observed, leading to a faster clarification. The total
decantation of the suspended particles in these experiments
happened in less than 30 min. It was assumed that the combi-nation of low chitosan concentration and high pH induced the
best condition for the formation of flocks. Thus, pH 6, 300 for
ppm chitosan concentration, 50 rpm for slow agitation speed and
3 min for slow agitation time were used for further chitosan
experiments