Abstract: This essay intends to explore the application of treating dye wastewater with a new Inorganic-Organic Composite Flocculant compounded with Chitosan/Bauxite by simple acid soluble coated method. It studied the structure of natural bauxite and complex with SEM and IR analyses, also it discussed the flocculation conditions of dye wastewater via orthogonal experiments. Results show that Chitosan mainly loaded in bauxite by simple physical adsorption, but Chitosan may load with bauxite's Aluminum frame through chemical adsorption. The dosage of composite flocculant and wastewater pH are the main factors of the wastewater treatment. When the dosage was 3g/L, pH was 5, the removal rate of COD and color were above 58% and 87% respectively, while the removal rate of COD and color of trap water after A/O process achieved above 46% and 83% each.

Key words: chetosan, bauxite, composite flocculant, dye wastewater