风干工艺强化催化氧化除氨氮/锰活性滤料膜负载

为强化地下水处理中催化氧化除氨氮/锰活性滤料表面膜负载强度,系统研究了风干温度对锰氧化物滤料氧化膜的活性、负载强度及负载量的影响,将不同温度风干的生产性滤料填充滤柱,检测沿滤柱深度的氨氮、锰浓度随时间的变化,分析风干温度对生产滤料活性恢复期、除氨氮锰能力和膜负载强度的影响规律.结果表明,滤料经风干处理可以明显缩短滤柱除氨氮/锰的恢复期,其中除氨氮活性最先恢复的是自然风干和60℃风干滤柱;经过风干处理的滤料氨氮/锰的处理能力明显增强,出水氨氮浓度更稳定,不同风干温度之间的差异不明显;滤料风干能显著增强膜负载强度;滤料在运行过程中,表面膜负载量呈现先减少后增长的趋势,特别是未风干处理滤料的运行初期膜量下降明显.利用XRD测定滤料样品表面锰氧化物的晶体结构,比较不同温度风干的初始滤料发现它们具有相同复杂的晶型.

Membrane loading of active filter media for enhanced catalytic oxidation removal of ammonium/manganese by air - drying process

In order to enhance the surface membrane loading of the active filter media for catalytic oxidation removal of ammonium/ manganese from groundwater, effects of air-drying temperature on the catalytic activity, membrane loading strength and loading capacity of filter media were systematically studied with five identical filter columns to detest how ammonium and manganese concentrations along the depth of the filter column change with time. The results indicated that the air-drying treatment of the filter media could significantly shorten the recovery period for the removal of ammonium/manganese from the filter column, of which the recovery of ammonium removal activity firstly happened to the natural air-drying and 60℃ air-drying filter columns. After air-drying treatment, the removal capacity of ammonium/manganese was obviously enhanced with stable effluent ammonium concentration and no significant difference between different air-drying temperatures. Air-drying filter media could significantly improve the capacity of membrane loading. During the operation period, the surface membrane loading decreased first and then increased, especially for the un-air-drying filter media. The results from the XRD on the crystal structure of manganese oxides coated on the surface of the filter media samples confirmed that the initial filter media dried at different temperatures had the same complex crystal form. Obviously, the enhancement of membrane loading scheme proposed in this study could provide theoretical reference for large-scale preparation of the active filter media.