陶瓷平板膜与PVDF中空纤维膜在MBR中的应用

通过搭建MBR膜性能评价平台,开展膜组件性能评估,以新型陶瓷平板膜为主体,与国内主导型膜材料产品进行性能对比研究,监测长期运行过程中膜通量变化、在线清洗频率、膜曝气强度、离线清洗周期等参数,并对膜的抗污染性能及陶瓷平板膜的清洗方式进行了分析。结果显示,在维持定期在线反冲洗、在线化学清洗的情况下,陶瓷平板膜的离线清洗周期大于6个月,形成的膜污染主要以对NaClO溶液更为敏感的有机物污染为主,而酸性清洗剂较易洗脱的无机物污染少;较高的清洗液温度、较长的浸渍时间,均有利于膜通量的恢复。将陶瓷平板膜用于实际工程中发现,出水COD和石油类物质均能达到回用水水质标准。

Application of Ceramic Flat Membrane and PVDF Hollow Fiber Membrane in MBR Process

Membrane module performance was assessed through constructing a MBR membrane performance evaluation platform. The performance of new ceramic flat membrane was compared with that of domestic leading membrane products. The change of membrane flux in the process of long-term operation,online cleaning frequency,membrane aeration intensity,offline cleaning cycle and other parameters were monitored,and the resistance of membrane fouling and the cleaning method of ceramic flat membrane were analyzed. Under the condition of maintaining the regular online backwash and online chemical cleaning,the ceramic flat membrane offline cleaning cycle was more than 6 months. Membrane fouling was mainly caused by the organic pollutants that were more sensitive to NaClO solution,but less inorganic pollutants that were more easily eluted by acid detergent. Longer soaking time and higher cleaning fluid temperature were beneficial to the recovery of membrane flux. The effluent COD and oil could reach the standard of reuse water when the ceramic flat membrane was used in practical engineering.