聚合氯化铝污泥吸附除磷的改性研究

研究了聚合氯化铝污泥(PACS)的酸和热改性及吸附动力学理论模型.结果表明,在酸处理过程中,经0.075mol/L盐酸在20℃下改性12h后所得酸改性PACS对磷的去除率最高,可达97.0%;在热处理过程中,经300℃煅烧温度下改性1h后所得热改性PACS对磷的去除能最高可达97.8%;相同静态吸附条件下,两种改性后PACS比原PACS对磷的去除率分别提高了21.4%及22.2%;吸附动力学拟合数据显示,PACS及酸、热改性PACS对磷的吸附行为可以用Simple Elovich模型较好的进行描述(R2≥0.97).

Adsorption removal of phosphorus from aqueous solution using modified polyaluminium chloride sludge

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).