In the present investigations, attempts were made to carryout flocculation studies of municipal wastewater with starch - graft - polyacrylamide. Those results were compared with magnafloc LT - 31, a commercial cationic polyacrylamide and magnafloc LT - 27, a commercial anionic polyacrylamide flocculants. The result that emerges from the works is that cationic polyelectrolyte, like magnafloc LT - 31 showed best performance comparing magnafloc LT - 27 and statch - g - polyacrylamide and guar gum - polyacrylamide. These flocculants could reduce colours of the effluents with FeCl 3 coagulants. © 2004 - Kalpana Corporation.