负载TiO2浮石对污水处理厂二沉池出水的矿化与灭菌研究

城市污水处理厂第二沉淀池出水的污染物浓度较低，经过矿化及灭菌等深度处理后可以回用，从而减轻对淡水资源的需求。本实验采用溶胶-凝胶法制备了负载TiO2的浮石光催化剂，对城市污水处理厂第二沉淀池出水进行了矿化及灭菌处理研究。采用低压汞灯对处理水样照射2h，有机物降解率可以达到50％，灭菌效率达到100％。处理后的水可以作为农作物灌溉、城市绿化和娱乐用水。负载在浮石表面的TiO2薄膜经过10次的光催化循环实验后，没有明显破损，可以再次循环使用。TiO2浮石具有质轻、机械性能好和价格低等优点，该方法处理废水的适用浓度低，可以广泛应用于微污染水和城市污水处理厂出水的深度处理。

TiO2 pumice mineralization and disinfection of treated wastewater from sewage treatment plants

The treated wastewater from sewage treatment plants can not be reused because it contains organic pollutants and pathogen. TiO2 pumices were prepared by Sol-Gel method, which were used as a catalyst for disinfection and mineralization of the treated wastewater from sewage treatment plants. The reduction rate of TOC in the treated wastewater is almost 50% and the sterilization rate is 100% when using TiO2 pumices. After using ten times, the TiO2 films on the pumices are almost undiminished. TiO2 pumices have a great prospect for wastewater treatment, because of pumices＇ low cost, floated property and great mechanical property.