摘要
以尺寸与人体肠道病毒相近的f2噬菌体作为模型病毒,本研究采用膜吸附反应器(Membrane adsorption reactor,MAR),考察膜分离与纳米TiO2耦合工艺对饮用水中病毒的去除效果.两种不同孔径的PVDF(0.20μm)、PAN(0.05μm)平板膜在自来水体系中对f2噬菌体的截留效果分别为1.88～2.56log和4.78～5.95log,大大超过理论计算值,这与膜具有不规则孔型的重叠筛网状结构直接相关.吸附实验结果表明,纳米TiO2对f2噬菌体的吸附在60min内即可达到吸附平衡,符合Freundlich等温吸附模型qe=27.4·ce1.24.两组MAR系统对f2噬菌体的总去除率分别高达3.88log与6.40log,这主要是由于纳米TiO2的吸附作用,以及运行中在膜表面形成有效的滤饼层.纳米材料与膜系统的耦合既保持了系统对病毒的高效去除,又实现了纳米颗粒的有效分离回收,操作简单、费用低.
A membrane adsorption bioreactor （MAR）, coupling of membrane separation and adsorption of nanometer TiO2, was tested for virus rejection in drinking water. Rejection of virus was investigated by spiking coliphage f2 （mean size of 25 nm）, which is similar in size to the human enteric pathogenic viruses, into tap water as a model virus. Two fiat-sheet membrane modules of different pore sizes, 0.20 μm and 0.05 μm, were used to investigate the effects of membrane pore sizes on virus rejection. In tap water system, 1.88-2.56log rejection of coliphage f2 could be achieved by PVDF membrane （0.20 μm） compared with 4.78-5.95log rejection by PAN membrane （0.05 μm）. It showed that virus rejection results in the experiments were generally higher than theoretic values. A possible explanation is that asymmetric membrane structure is considered to be an important factor affecting virus transmission through the membrane. It showed that adsorption equilibrium conditions could be established in some 60 minutes and the adsorption of nano-TiO2 to phage f2 corresponded well with the Freundlich isotherm （qe = 27.4·c1.24）. Rejection of virus in the two MAR systems was 3.88log and 6.40log respectively, which is due to the adsorption nanometer TiO2 and the effective filter cake layer formed on the surface of membrane during operation. The coupling ofnanometer materials and membrane system not only kept the high removal of virus in the system, but also achieved the effective separation recycle of nanometer, along with the advantages of simple operation and low cost.
出处
《中国科学：化学》
CAS
CSCD
北大核心
2012年第10期1479-1486,共8页
SCIENTIA SINICA Chimica
基金
国家"十一五"重大科技专项(2009ZX07209-005)
哈尔滨工业大学城市水资源与水环境国家重点实验室开放基金项目(ES201005)
中国科学院生态环境研究中心环境水质学国家重点实验室开放基金(2010-001)资助
关键词
膜吸附反应器
F2噬菌体
吸附
membrane adsorption reactor （MAR）, f2 phage, adsorption
