efficient flocculants for further experimentation using coagulant
and flocculant mixtures, and with flocculated biomass used as ballast
agent. From the experiments, it was found for non-ionic
Superfloc N-300 (Fig. 2a) and anionic Superfloc A-100 (Fig. 2b) flocculants
used, that the flocculation efficiency both was of them
close to the control experiment. Our study has shown that the
PEO-based cationic flocculant Sibfloc-718 has similar efficiency to
that of the PAA cationic flocculant Superfloc C-492. Thus, sedimentation
efficiency of about 80% was achieved in 120 min for both
flocculants. However, note that the efficiency, over 5 min of sedimentation,
for Sibfloc-718 of 15 mg/l concentration (Fig. 2d) was
50%, whereas in Superfloc C-492 case at 25 mg/l concentration
(Fig. 2c) it was 40%.