操作条件及膜材质对膜生物反应器的影响

Influence of operational parameters and membrane materials on membrane bioreactor

采用正交实验的方法对比曝气量、产水通量和温度等操作条件对气升陶瓷膜和聚偏氟乙烯(PVDF)中空纤维膜构成的膜生物反应器运行过程及膜污染的影响,为膜生物反应器设计提供实验数据.实验设计了3因素3水平正交实验,以跨膜压差平均增长率为考察指标,并通过极差大小判断了3种因素对于PVDF膜影响由大到小顺序为:曝气量、产水通量、温度;对陶瓷膜影响由大到小顺序为:产水通量、温度、曝气量.实验结果表明:由于膜材料和构型的差异,陶瓷膜比PVDF膜可以在更高的通量下运行,并具有较强的抗污染性能,而且陶瓷膜更容易有效降低曝气量,从而降低系统运行的能耗.

The orthogonal experiments were adopted to investigate the influence of the three factors of aeration rate, permeate flux and running temperature on the process running and membrane fouling of submerged membrane bioreactor with ceramic membrane or PVDF hollow fiber membrane. A set of orthogonal experiments of 3-factor and 3- level were designed and the average growth rate of transmembrane pressure was taken as investigating target Range was used to judge the influence of the three factors. The influence of these three factors on the performance of PVDF membrane in descending order was ： aeration rate, permeate flux, running temperature. And for the ceramic membrane the order was： permeate flux, running temperature, aeration rate. The results showed that, compared with the PVDF membrane, the ceramic membrane could be run in higher permeate flux and its antifouling property was excellent. The aeration rate could be reduced effectively to save the energy.