Supplementary Fig. S3 shows that agitation speed did not have a
significant effect on the sludge dewatering properties of the
extracted bio-flocculants. Efficient dewatering ability with high
solids removal (96e99%) and water recovery (45e53.5%) were
obtained at all agitation speeds, however the decrease in water
recovery from 200 to 250 rpm is noted and correlates with the
decrease in yield shown in Supplementary Fig. S2. Agitation at
200 rpm was chosen as the optimum speed based on the yield and
water recovery obtained at this condition.