中空纤维膜无泡曝气氧传质性能试验研究

Oxygen Mass Transfer Performance of Hollow Fiber Membrane with Bubble-free Aeration

为探究中空纤维膜无泡曝气技术水体充氧性能,使用聚四氟乙烯(PTFE)和聚丙烯(PP)两种材质的中空纤维膜组件,分别在曝气压强为2、4、6 kPa,曝气流量为18、36、54 L/h条件下进行清水曝气测试,并对两种中空纤维膜的氧传质系数、氧传质速率以及曝气效率等进行分析。结果表明,PTFE和PP两种中空纤维膜组件均能实现无泡曝气,且PP中空纤维膜组件的充氧效果相比PTFE组件要好;当曝气压强为4 kPa、曝气流量为36 L/h时,PTFE和PP膜组件的氧传质速率分别为0.326、0.550 g/(m^2·h)。中空纤维膜无泡曝气技术具有操作压力小、氧传质速率高等特点,充氧效果优于传统曝气。

Polytetrafluoroethylene(PTFE)and polypropylene(PP)hollow fiber membrane modules were used to explore the oxygenation performance of bubble-free aeration in water body under the conditions of aeration pressure of 2 k Pa,4 kPa and 6 kPa and aeration flow rate of 18 L/h,36 L/h and54 L/h,and the oxygen mass transfer coefficient,oxygen mass transfer rate and aeration efficiency of the two hollow fiber membranes were analyzed by clean water aeration test.Both the PTFE and PP hollow fiber membrane modules could achieve bubble-free aeration,and the PP hollow fiber membrane modules had better oxygenation effect than that of the PTFE.Under the conditions of aeration pressure of 4 kPa and aeration flow rate of 36 L/h,the oxygen mass transfer rates of the PTFE and PP membrane modules were 0.326 g/(m^2·h)and 0.550 g/(m^2·h),respectively.Hollow fiber membrane aeration technology is characterized by low operating pressure and high oxygen mass transfer rate,and the aeration efficiency is better than that of the traditional aeration technology.