DOI: 10.1016/j.watres.2018.04.025
Scopus记录号: 2-s2.0-85047450409
论文题名: Ultrafiltration and nanofiltration membrane fouling by natural organic matter: Mechanisms and mitigation by pre-ozonation and pH
作者: Yu W. ; Liu T. ; Crawshaw J. ; Liu T. ; Graham N.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 139 起始页码: 353
结束页码: 362
语种: 英语
英文关键词: Fouling
; Humic acid
; Nanofiltration
; Ozonation
; Surface water
; Ultrafiltration
Scopus关键词: Biogeochemistry
; Biopolymers
; Fouling
; Hydrophilicity
; Hydrophobicity
; Membrane fouling
; Nanofiltration
; Nanofiltration membranes
; Organic compounds
; Ozone
; Ozone water treatment
; Ozonization
; pH effects
; Pore size
; Surface treatment
; Ultrafiltration
; Water filtration
; Humic acid
; Increasing solutions
; Membrane pore size
; Membrane surface
; Natural organic matters
; Negative zeta potentials
; Organic fractions
; Organics removal
; Surface waters
; biopolymer
; humic acid
; natural organic matter
; surface water
; ozone
; biofouling
; humic acid
; hydrophobicity
; lake water
; membrane
; organic matter
; ozonation
; pH
; pollutant removal
; polymer
; pore space
; ultrafiltration
; water treatment
; Article
; contact angle
; fouling control
; hydrophilicity
; hydrophobicity
; membrane
; membrane permeability
; molecular weight
; nanofiltration
; ozonation
; pH
; priority journal
; surface charge
; surface property
; ultrafiltration
; waste component removal
; water treatment
; zeta potential
; artificial membrane
; chemical phenomena
; chemistry
; devices
; humic substance
; pH
; procedures
; ultrafiltration
; water management
; Humic Substances
; Hydrogen-Ion Concentration
; Hydrophobic and Hydrophilic Interactions
; Membranes, Artificial
; Molecular Weight
; Ozone
; Ultrafiltration
; Water Purification
英文摘要: The fouling of ultrafiltration (UF) and nanofiltration (NF) membranes during the treatment of surface waters continues to be of concern and the particular role of natural organic matter (NOM) requires further investigation. In this study the effect of pH and surface charge on membrane fouling during the treatment of samples of a representative surface water (Hyde Park recreational lake) were evaluated, together with the impact of pre-ozonation. While biopolymers in the surface water could be removed by the UF membrane, smaller molecular weight (MW) fractions of NOM were poorly removed, confirming the importance of membrane pore size. For NF membranes the removal of smaller MW fractions (800 Da–10 kDa) was less than expected from their pore size; however, nearly all of the hydrophobic, humic-type substances could be removed by the hydrophilic NF membranes for all MW distributions (greater than 90%). The results indicated the importance of the charge and hydrophilic nature of the NOM. Thus, the hydrophilic NF membrane could remove the hydrophobic organic matter, but not the hydrophilic substances. Increasing charge effects (more negative zeta potentials) with increasing solution pH were found to enhance organics removal and reduce fouling (flux decline), most likely through greater membrane surface repulsion. Pre-ozonation of the surface water increased the hydrophilic fraction and anionic charge of NOM and altered their size distributions. This resulted in a decreased fouling (less flux decline) for the UF and smaller pore NF, but a slight increase in fouling for the larger pore NF. The differences in the NF behavior are believed to relate to the relative sizes of ozonated organic fractions and the NF pores; a similar size of ozonated organic fractions and the NF pores causes significant membrane fouling. © 2018 The Authors Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112760
Appears in Collections: 气候减缓与适应
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作者单位: Department of Civil and Environmental Engineering, Imperial College London, South Kensington Campus, London, SW7 2AZ, United Kingdom; Department of Chemical Engineering, Imperial College London, South Kensington Campus, London, SW7 2AZ, United Kingdom
Recommended Citation:
Yu W.,Liu T.,Crawshaw J.,et al. Ultrafiltration and nanofiltration membrane fouling by natural organic matter: Mechanisms and mitigation by pre-ozonation and pH[J]. Water Research,2018-01-01,139