摘要
将适量铜纳米线(Cu-NWs)添加到常规聚偏氟乙烯(PVDF)铸膜液中,通过相转化法制备Cu-NWs导电微滤膜,表征其过滤及导电性能,并将其置于膜生物反应器(MBR)中长期运行,研究其污染物去除效果及膜污染行为,可为污水处理MBR系统的低成本稳定运行提供新途径.结果表明,添加适量基于铸膜液质量的Cu-NWs,所得微滤膜的膜通量为721.9L/(m^2·h),膜面接触角为57.9°,同时,其起始电势、欧姆内阻及活化内阻分别为315.0mV、2.4?和6.9?,均优于商用PVDF微滤膜.扫描电子显微镜(SEM)观察发现,Cu-NWs在膜面活性层交织形成了良好的导电网络.将其制作成膜组件安装于MBR系统中,兼用作阴极,COD、氨氮、TN和TP的去除率分别为91.5%、99.3%、76.3%和76.2%,高于对照MBR系统.连续运行146d,TMP始终低于25kPa,无需清洗膜组件.傅里叶变换红外光谱仪(FTIR)分析表明,膜面污染物质主要是蛋白质和多糖,膜面EPS含量远低于商用PVDF膜.所制备新型Cu-NWs导电微滤膜具有较好的稳定性、耐用性和抗污染性,应用前景广阔.
In this manuscript,the Cu-NWs conductive microfiltration membrane,obtained via phase inversion method,was prepared by dosing moderate Cu-nanowires(Cu-NWs)into conventional polyvinylidene fluoride(PVDF)casting solution.The filtration and conductivity properties of obtained conductive membrane were characterized.Finally,the efficiency of pollutant removal and membrane fouling behaviour were investigated in a membrane bioreactor(MBR)system with the prepared conductive microfiltration membrane for long-term operation.It provided a new route for the stable operation of MBR system with low cost.With dosing a certain amount of Cu-NWs,the membrane flux of prepared conductive microfiltration membrane was 721.9L/(m2·h)and its surface contact angle was 57.9°,which were better than those of commercial PVDF microfiltration membrane.The initial potential,ohmic resistance and activation resistance were 315mV,2.4Ωand 6.9Ω,respectively.The scanning electron microscope(SEM)observation showed an excellent conductive network in the active layer of membrane.The removal rates of the established MBR system with prepared conductive microfiltration membrane were 91.5%for chemical oxygen demand(COD),99.3%for NH4+-N,76.3%for total nitrogen(TN)and 76.2%for total phosphorus(TP),which were higher than those of the control MBR system.Over 146-d operation,the TMP was always lower than 25kPa and the membrane cleaning was not needed.The Fourier transformation infrared spectrometer(FTIR)analysis showed that the main contaminants on the membrane surface were proteins and polysaccharides,and the content of EPS on membrane surface was much lower than that of commercial PVDF membrane.The novel Cu-NWs conductive microfiltration membrane with good stability,durability and antifouling property showed a promising prospect.
作者
印霞棐
李秀芬
华兆哲
任月萍
王新华
YIN Xia-fei;LI Xiu-fen;HUA Zhao-zhe;REN Yue-ping;WANG Xin-hua(Jiangsu Key Laboratory of Anaerobic Biotechnology,School of Environmental and Civil Engineering,Jiangnan University,Wuxi 214122,China)
出处
《中国环境科学》
EI
CAS
CSSCI
CSCD
北大核心
2018年第10期3729-3738,共10页
China Environmental Science
基金
国家重点研发计划课题(2016YFC0400707)
江苏省“六大人才高峰”项目(2011-JNHB－004)
江苏省普通高校学术学位研究生科研创新计划项目(KYLX16_0812)
关键词
铜纳米线
导电微滤膜
导电性能
抗污染性能
Cu-nanowires
conductive microfiltration membrane
electrical conductivity
antifouling property
