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观察新型五孔PVDF共混改性纤维膜SEM形貌特征,采用逐级通量法测定PVDF/PMMA和PVDF/TPU共混改性膜的临界通量,研究在次临界和超临界通量下A(PVDF/PMMA)与B(PVDF/TPU)2种管式膜组件的过滤和抗污染性能,并在次临界通量下处理地表水。结果表明,PVDF共混改性膜具有优良的微观结构,且膜B性能较好;膜A、B的临界通量分别为12 L/(m2.h)和10 L/(m2.h);膜组件B比膜组件A抗污染性能好。次临界通量下膜组件的运行比超临界通量下的稳定。与采用单独超滤处理某市地表水相比,2种膜组件采用混凝+超滤工艺的运行处理效果更好,且膜组件B比膜组件A处理效果佳。
The morphological features of the new five-hole PVDF blend modified fiber membranes were observed. The critical fluxes of PVDF / PMMA and PVDF / TPU blend modified membranes were determined by the stepwise flux method. The effects of sub-critical and supercritical fluxes A (PVDF / PMMA) and B (PVDF / TPU) two kinds of tubular membrane module filtration and anti-pollution performance, and sub-critical flux of surface water treatment. The results show that PVDF blend modified membrane possesses excellent microstructure and good film B performance. The critical fluxes of membrane A and B are 12 L / (m2.h) and 10 L / (m2.h), respectively. Membrane module B is better than membrane module A in anti-pollution performance. Subcritical fluxes operate more efficiently than supercritical fluxes. Compared with the surface ultra-filtration treatment of municipal surface water, the operation of two kinds of membrane modules by coagulation + ultrafiltration is better, and membrane module B is better than membrane module A.