574878.fig.0024a
(a)
574878.fig.0024b
(b)
Figure 24: versus time for flocculation with polyelectrolytes of the concentration of 0.5 mg/L. (a) (b) . The molecular weights of the polyelectrolytes are (■) 4.9 million, () 3.5 million, (▲) 1.2 million, (○) 0.49 million, and (×) 0.16 million.