“…Another interesting natural polyelectrolyte receiving attention recently is the cationic polysaccharide chitosan. It has been used as a flocculant for treating oily waste streams,10 mineral colloids,11 cellular suspensions,12 river silt,13 and kaolinite 14. These applications focus on flocculating negatively charged colloids, at pH values below 7 where the chitosan is soluble.…”