| Abstract: | Polyelectrolyte complexes (PEC) from poly(diallyl-dimethyl-ammoniumchloride) PDADMAC and two different polyanions, formed
in aqueous solution, were characterized by different methods (zeta-potential, net content, turbidity) and applied as flocculants.
The flocculation of clay was investigated by sedimentation measurement as well as by a dynamic method, using a Fibre Optical
Flocculation Sensor. The results of both methods showed that the most important advantages of PEC were the high velocity of
sedimentation and a very broad range of the optimum flocculation concentration. In spite of the differences in the complex-forming
behavior of the two polyanions used, no significant differences between complexes of the same composition but different polyanions
are obtained. In contrast, the ratio of anionic to cationic charges is of great importance for the mechanism of flocculation.
Received: 30 May 1997 Accepted: 22 September 1997 |
