3种纳米材料改性PVDF膜的抗污染性能评价
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摘要
采用模拟有机污染物(腐殖酸、海藻酸钠、牛血清白蛋白及其混合液),考察纳米(ZnO、Ag和TiO_2)改性聚偏氟乙烯(PVDF)膜对污染物的分离效能。结果表明,模拟污染物的膜污染机制与纳米改性无关联。PVDF/ZnO膜的水处理效能最佳,通量恢复率90%,可逆污染占总污染比例约90%。与PVDF膜相比,PVDF/ZnO膜在海藻酸钠条件下的污染指数降低了84.8%,对腐殖酸和混合液的浊度去除率分别达到98.9%和94.8%,且对浊度有更高的去除率。ZnO改性PVDF膜表现出良好的水分离性能和抗污染能力,可用于水处理过程。
Humic acid(HA), sodium alginate(SA), bovine serum albumin(BSA), HA+SA+BSA mixed solution were used to investigate the separation properties of three kinds of nano-sized materials(ZnO, Ag and TiO_2) modified PVDF membrane. The results showed that the membrane fouling mechanism of simulated pollutants did not associate with nano-modification. The PVDF/ZnO membrane exhibited better water treatment efficiency. The flux recovery rate of PVDF/ZnO membrane was 90%, and the reversible resistance ratio accounted for about 90%. Compared with the PVDF membrane, the fouling index of PVDF/ZnO membrane decreased by 84.8% in the presence of SA, and the turbidity removal rates of humic acid and mixture were 98.9% and 94.8% respectively, and the removal rate of turbidity was also higher. ZnO modified PVDF membrane showed good water separation and antifouling capacity, which could be used for wastewater treatment.
Humic acid(HA), sodium alginate(SA), bovine serum albumin(BSA), HA+SA+BSA mixed solution were used to investigate the separation properties of three kinds of nano-sized materials(ZnO, Ag and TiO_2) modified PVDF membrane. The results showed that the membrane fouling mechanism of simulated pollutants did not associate with nano-modification. The PVDF/ZnO membrane exhibited better water treatment efficiency. The flux recovery rate of PVDF/ZnO membrane was 90%, and the reversible resistance ratio accounted for about 90%. Compared with the PVDF membrane, the fouling index of PVDF/ZnO membrane decreased by 84.8% in the presence of SA, and the turbidity removal rates of humic acid and mixture were 98.9% and 94.8% respectively, and the removal rate of turbidity was also higher. ZnO modified PVDF membrane showed good water separation and antifouling capacity, which could be used for wastewater treatment.
引文
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[3]龚烨霞,张事,左行涛,等.纳米氧化锌改性聚偏氟乙烯超滤膜的性能研究[J].环境工程学报,2017,7(11):4091-4096.
[4]杨丽,魏昕,杨永强.处理石化废水超滤膜制备过程中膜材料的筛选[J].水处理技术,2017,43(5):85-88.
[5]SCHIPPERS J C,VERDOUW J.The modified fouling index,a method of determining the fouling characteristics of water[J].Desalination,1980,32(1/3):137-148.
[6]WANG X M,LI X Y,HUANG X.Membrane fouling in a submerged membrane bioreactor(SMBR):Characterization of the sludge cake and its high filtration resistance[J].Separation and Purification Technology,2007,52(3):439-445.
[7]SHEN Y,ZHAO W,XIAO K,et al.A systematic insight into fouling propensity of soluble microbial products in membrane bioreactors based on hydrophobic interaction and size exclusion[J].Journal of Membrane Science,2010,346(1):187-193.