超滤膜界面Zeta电位的膜污染特性研究
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摘要
为了进一步解析复杂有机物在超滤膜界面上的不可逆污染变化特征,本研究以3种典型的有机污染物海藻酸钠(SA)、腐植酸(HA)及牛血清蛋白(BSA)为研究对象,分析它们在使用超滤膜过滤过程中膜界面Zeta电位变化特征,通过引入"差异时段过滤膜污染累积"的分析方法,建立并研究界面Zeta电位与膜不可逆污染间的内在联系.结果表明,膜不可逆污染阻力与各过滤阶段初始Zeta电位变化之间呈现很好的负相关性,即过滤清洗后膜面Zeta电位可以有效反映过滤过程中膜不可逆污染的累积程度;在整个过滤过程中膜面Zeta电位随污染物的累积逐渐由膜本征电位向污染物本征电位靠近,过滤最终污染膜面的实时Zeta电位受污染物电性影响更为显著;在各典型有机污染物中,SA造成的不可逆污染累积最为严重.
In order to further analyze the irreversible fouling characteristics of complex organic matters at the ultrafiltration membranes interface,sodium alginate(SA),humic acid(HA),bovine serum albumin(BSA)were used to evaluate the ultrafiltration fouling.By introducing the analysis method of"membrane fouling accumulation during differential time filtration",the internal relationship between Zeta and irreversible fouling at the interface was established.The results show there is a good negative correlation between the membrane irreversible fouling resistance and the initial zeta potential in each filtration stage,that is,after filtration and cleaning,membrane Zeta potential could effectively reflect the cumulative degree of membrane irreversible fouling in the filtration process.During the whole filtration process,the final zeta potential value is much closer to the foulants intrinsic potential which means that the final Zeta potential at the fouled membrane surface is determined by the foulants itself.Among the typical organic foulants,the accumulation of irreversible membrane fouling caused by SA is the most serious.
In order to further analyze the irreversible fouling characteristics of complex organic matters at the ultrafiltration membranes interface,sodium alginate(SA),humic acid(HA),bovine serum albumin(BSA)were used to evaluate the ultrafiltration fouling.By introducing the analysis method of"membrane fouling accumulation during differential time filtration",the internal relationship between Zeta and irreversible fouling at the interface was established.The results show there is a good negative correlation between the membrane irreversible fouling resistance and the initial zeta potential in each filtration stage,that is,after filtration and cleaning,membrane Zeta potential could effectively reflect the cumulative degree of membrane irreversible fouling in the filtration process.During the whole filtration process,the final zeta potential value is much closer to the foulants intrinsic potential which means that the final Zeta potential at the fouled membrane surface is determined by the foulants itself.Among the typical organic foulants,the accumulation of irreversible membrane fouling caused by SA is the most serious.
引文
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[15]李俊,奚旦立,石勇.动态膜处理污水时阻力分布及污染机理[J].化工学报,2008,59(9):2309-2315.
[2]王捷,尹延梅,贾辉,等.磁场强化絮凝减缓膜污染的影响因素分析[J].环境科学学报,2013,33(3):664-670.
[3]Gao F,Wang J,Zhang H,et al.Interaction energy and competitive adsorption evaluation of different NOMfractions on aged membrane surfaces[J].J Membr Sci,2017,542:195-207.
[4]Yao S,Costello M,Fane A G,et al.Non-invasive observation of flow profiles and polarization layers in hollow fibers membrane filtration modules using NMR micro-imaging[J].J Membr Sci,1995,99(3):207-216.
[5]Zamani F,Wicaksana F,Taheri A H,et al.Generalized criterion for the onset of particle deposition in crossflow microfiltration via DOTM-Modeling and experimental validation[J].J Membr Sci,2014,457:128-138.
[6]Cui Z,Wang J,Zhang H,et al.Influence of selective permeation of backwashing solution on the cleaning effectiveness in hollow fiber system[J].J Membr Sci,2017,546:139-150.
[7]Ferrando M,Rǒ6ek A,Zator M,et al.An approach to membrane fouling characterization by confocal scanning laser microscopy[J].J Membr Sci,2005,250(1):283-293.
[8]Altmann J.Particle deposition and layer formation at the crossflow microfiltration[J].J Membr Sci,1997,124(1):119-128.
[9]张圆圆.制浆造纸废水Zeta电位的实时检测[D].南宁:广西大学,2013.
[10]Soffer Y,Gilron J,Adin A.Streaming potential and SEM-EDX study of UF membranes fouled by colloidal iron[J].Desalination,2002,146(1):115-121.
[11]Schiewer S,Volesky B.Modeling of the proton-metal ion exchange in biosorption[J].Environ Sci Technol,1995,29(12):3049-3058.
[12]Nakamura K,Orime T,Matsumoto K.Response of zeta potential to cake formation and pore blocking during the microfiltration of latex particles[J].J Membr Sci,2012,401/402(19):274-281.
[13]Jia H,Zhang H.M,Wang J,et al.Response of zeta potential to different types of local membrane fouling in dead-end membrane filtration with yeast suspension[J].RSC Adv,2015,5,78738-78744.
[14]Hunter R J.Zeta potential in colloid science[M]//London:Academic Press,1981.
[15]李俊,奚旦立,石勇.动态膜处理污水时阻力分布及污染机理[J].化工学报,2008,59(9):2309-2315.