基于油水污染机理的动态膜清洗实验研究

Study on Dynamic Membrane Cleaning Based on Oil-Water Pollution Mechanism

制备α-Al_2O_3管状陶瓷膜基ZrO_2动态膜并将其用于油水乳化液的分离,对该过程的污染机理进行分析后,选择四种清洗剂对污染膜进行多方案清洗实验,通过理论分析确定了最佳清洗顺序,即"碱洗→吐温80→酸洗→柠檬酸"。单步清洗实验中,考察不同清洗剂浓度下的膜通量恢复率,确定各清洗剂的最佳清洗浓度与时间,清洗后渗透通量恢复情况为:氯化氢>氢氧化钠>柠檬酸>吐温80;多步清洗试验表明,四步清洗效果最好,通量恢复率达到了79.8%;根据重复清洗试验结果,结合过滤阻力模型计算和红外测试分析,确定动态膜基膜能循环使用3~4次。研究结果对动态膜的清洗复用提供依据。

α-Al2O3 membrane supported ZrO2 dynamic membranes were prepared and applied in oil-water emulsion separation. Four reagents were used in polluted membrane cleaning based on pollution mechanism. The optimum cleaning sequence（NaOH-Tween-80-HCl-citric acid） is confirmed by theoretical analysis. For one-step cleaning, flux recovery rates under different concentrations of cleaning reagents were studied and the optimum reagent concentration and cleaning time were obtained. The performance of these reagents is in an order of HCl 〉NaOH 〉citric acid 〉Tween-80. Multi-step cleaning results show that the four-step cleaning method has the best performance with flux recovery rate of 79.8%. Repetitive cleaning results combined with filtration resistance model and infrared analysis show that the supporting membrane can be reused for 3～4 times. This study is helpful in investigating cleaning and recycling of dynamic membranes.