Flocculation of Organic Matter and Aluminum in Source water by the Combined Flocculation of Chitosan-inorganic Coagulant

In this paper,the combined flocculation of chitosan and inorganic flocculant was tested.The experiment results show that the combined flocculation can reciprocally promote each flocculant behavior,remarkably enhance the effect of removing turbidity and organic matter.The combined flocculation effect of chitosan flocculant and three inorganic flocculant(aluminium sulfate,ferric chloride and polymeric aluminium-ferric)show that the combined flocculation effect of chitosan flocculant and polymeric aluminium-ferric is best,under optimum conditions,the rate of removing turbidity,CODMN and UV254 is 97%,44% and 55% respectively.In addition,no matter chitosan combined with inorganic flocculation or not,on the best conditions,the residual aluminum concentration is less than the examination methods limit in effluent water.