Abstract：The polyaluminium chloride sludge (PACS) was modified by acid and heat in this study, and the corresponding adsorption kinetics models for the modified PACS were investigated. The results showed that an optimal removal efficiency of 97.0% for phosphorus was achieved when the PACS sample was treated using acid method with 0.075 mol/L HCl at 20℃ for 12 h. For the heat modified PACS, the maximum adsorption capacities of phosphorus of 97.8% was obtained for the sample heated at 300℃ for 1h. At the same static adsorption conditions, the phosphorus removal efficiency using acid treated PACS and heat treated PACS was enhanced by 21.4% and 22.2% than that of raw PACS, respectively. Moreover, the adsorption kinetic parameters of PACS and acid or heat treated PACS reviewed that the Simple Elovich model could explain the adsorption data well (R230.97).
