聚偏氟乙烯再生膜的制备与性能研究

Preparation and performance characterization of the polyvinylidene fluoride(PVDF)recycled membranes

考察了以MBR生活污水和微电子电镀废水处理工程产生的废旧平板膜表面的PVDF制备再生膜的过程中,废旧PVDF占再生膜铸膜液中总PVDF的比例对再生膜结构和性能的影响.结果表明,向铸膜液中掺杂33%(质量分数)从废旧膜面提取得到的PVDF,对再生膜铸膜液黏度影响不大,然而将从废旧膜面提取得到的PVDF的掺杂量增大到75%后,再生膜铸膜液黏度有所降低,膜皮层结构致密程度较新膜低.制备得到的再生膜表面的水接触角与新膜相比相差不大,且新膜和再生膜表面均为亲水性表面.以新膜和再生膜运行MBR小试装置,4个再生膜组件的出水COD和NH_3—N浓度与新膜膜组件相比相差不大,出水浊度均小于1NTU.

The influence of thedoping amount of the polyvinylidene fluoride （PVDF）extractive from waste flat membranes of domestic swage and electroplating wastewater membrane bioreactor （MBR） engineering into the casting solutions on the structure and performance of the recycled PVDF flat membranes has been investigated in this paper. According to the experiment results, the viscosity of the casting solutions doping 33% PVDF extractive were similar to that of the new membrane casting solution. The viscosity of the casting solutions with 75% PVDF extractive doping amount decreased and the corresponding recycled membranes exhibited relatively incompact cortexes compared with the new membrane. The water contact angles of the new membrane and the recycled membranes were very similar and the membrane surfaces were all hydrophilic. The performance of the membranes were tested in a small experimental MBR and the COD and NH3-N concentrations in the effluent of the four recycled membranes were almost the same with that of the new membrane. Moreover, the turbidity of the effluent of the membranes were all lower than 1 NTU.