磁性离子交换树脂强化水源中有机物去除性能研究

在调查某水厂水源水质及传统工艺处理效能的基础上，对比探讨了粉末活性炭和磁性离子交换树脂分别以预吸附、预吸附-混凝、混凝沉淀-吸附等不同工艺对水源水中溶解性有机物的去除效能，确定了最佳工艺。该水源存在季节性有机物污染，亲水性有机质占比80%。水厂传统工艺对有机物的去除能力约20%~30%。与其他工艺相比，树脂预吸附-混凝对有机物的去除功效最好，DOC和UV254的去除率分别达到41.48%和80.0%，与单独强化混凝相比，该工艺可将DOC和UV254的去除效率分别提高17.7和35.49个百分点，且可减少86.67%的混凝剂投加量。Langmuir等温线模型和拟二级动力学方程可定量描述树脂吸附有机物平衡和动力学。磁性离子交换树脂预吸附可作为该水厂强化去除水源中溶解性有机物的可靠技术。

Enhanced removal efficacy of organics from raw water by magnetic ion exchange resin

Water quality of raw water was investigated, and the removal efficacy of dissolved organic matter was analyzed during the traditional drinking water treatment plant. The removal of dissolved organics in raw water was compared and discussed during the different treatment processes enhanced by powder-activated carbon or magnetic ion exchange resin. And the optimal combined process was obtained. The raw water was polluted by seasonal organics, and the hydrophilic components accounted for 80% of total organic matters approximately. The 20%~30% of dissolved organic matters were removed by the traditional drinking water treatment process. Compared with other treatment processes, the process of resin pre-adsorption coupled with coagulation had the best efficacy for the removal of dissolved organic matters, and the removal efficiency of DOC and UV254 was 41.48% and 80.0%, respectively. Compared with the enhanced coagulation, the removal efficiency of DOC and UV254 was improved by 17.7 and 35.49 percent by the process mentioned above, and the dosage of coagulant was reduced by 86.67%. Langmuir isotherm model and pseudo second-order kinetic equation could describe the equilibrium and kinetics of dissolved organic matters adsorbed on resin. Magnetic ion exchange resin pre-adsorption can be used as a reliable technology to enhance the traditional drinking water treatment process for the removal of dissolved organic matter from raw water.