新型五孔PVDF共混改性膜抗污染性能研究

观察新型五孔PVDF共混改性纤维膜SEM形貌特征,测量改性膜的接触角和临界通量,1#(PVDF/PMMA/TPU)、2#(PVDF/PMMA/PVC)共混改性膜分别在次临界和超临界通量下进行过滤实验.结果表明:PVDF共混改性膜具有优良的微观结构,且1#共混膜性能较好;1#共混膜的接触角比2#共混膜小;1#、2#共混膜的临界通量分别为10和14L/(m2.h);1#共混膜比2#共混膜抗污染性能好;次临界通量下共混膜的运行比超临界通量下的稳定.两种共混膜分别在次临界通量下采用单独超滤和混凝+超滤工艺处理某市地表水,得出混凝+超滤工艺处理效果较好,且1#共混膜比2#共混膜处理效果好.

Study on anti-fouling properties of novel five-bore PVDF blend modified membranes

The morphologies for of novel five-bore PVDF blend modified membranes were observed by SEM.The water contact angle and critical fluxes of different novel five-bore PVDF hollow fiber membranes were measured.Then the filtration experiments at sub-critical flux and super-critical flux of No.1(PVDF/PMMA/TPU)blend modified membrane and No.2(PVDF/PMMA/PVC) blend modified membrane were carried out.The results showed that the PVDF blend modified membranes possessed excellent microstructure and the microstructure of No.1 was better.The contact angle of No.1 blend membrane was lower than that of No.2 blend membrane.The critical fluxes of two blend membranes were 10 L/(m2·h) and 14 L/(m2·h),respectively.The anti-fouling property of No.1 blend membrane was better than that of No.2 blend membrane.The operating characteristic under sub-critical flux was more stable than that of under super-critical flux.Two blend membranes were used to treat ground-surface water under sub-critical flux and the effects of that with coagulation as pretreatment were studied.The results showed that the wastewater treatment performance of coagulation-ultrafiltration combination process was better than that of ultrafiltration process alone,and the wastewater treatment performance of No.1 blend membrane was better than that of No.2 blend membrane.