Chitosan can be a potential substitute for aluminum salts and synthetic polyelectrolytes in water treatment because it can: (1) avoid the health effects from residual aluminum (III) and synthetic polymers; (2) produce biodegradable sludge; and (3) reuse the crab shell. In this study, the chitosan flocculation characteristics in water were studied firstly, and then the combined flocculation of chitosan and inorganic flocculant is tested. The results show that the chitosan has favourable coagulation behavior. But the optimum dosage of chitosan removing turbidity and organic matter is different b...
