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以正渗透膜分离系统为实验装置对某校园生活污水进行处理,考察了正渗透膜在膜朝向不同时对水通量和氮的截留效率的影响以及膜污染的状况。结果表明,正渗透过程活性层朝向原料液侧的FO模式下水通量下降趋势较小,水通量较稳定,且对污水中的氮污染物的截留效果好于压力阻尼渗透过程活性层朝向驱动液侧的PRO模式。FO模式运行下的膜污染比PRO模式相对较轻,污染物质在膜的活性层表面形成了胶状层,采用去离子水浸泡+设备运行冲洗的物理方法对污染的膜进行清洗后,膜活性层表面的大部分污染物被清除,膜表面的初始形态可基本恢复。
Taking the positive osmosis membrane separation system as the experimental device, the domestic sewage in a campus was treated. The influence of the positive osmosis membrane on the water flux and nitrogen retention efficiency and the fouling status of the membrane were investigated. The results show that the water flux in the FO mode with the active layer toward the raw material liquid decreases slightly, the water flux is stable, and the retention of nitrogen pollutants in the wastewater is better than that of the pressure-damping and infiltration process. Liquid-side PRO mode. The membrane fouling under FO mode operation is relatively lighter than that of PRO mode. The pollutant forms a gel-like layer on the surface of the active layer of the membrane, and the membrane activity is washed by deionized water immersion + physical operation of the device to wash the membrane. Most of the surface layer of contaminants were removed, the initial morphology of the membrane surface can be basically restored.