DOI: 10.1016/j.watres.2017.12.058
Scopus记录号: 2-s2.0-85040226975
论文题名: Linking composition of extracellular polymeric substances (EPS) to the physical structure and hydraulic resistance of membrane biofilms
作者: Desmond P. ; Best J.P. ; Morgenroth E. ; Derlon N.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 132 起始页码: 211
结束页码: 221
语种: 英语
英文关键词: Biofilm
; EPS
; GDM
; Gravity driven membrane filtration
; Hydraulic resistance
; Physical structure
; Ultrafiltration
Scopus关键词: Biofilms
; Carbon
; Filtration
; Membranes
; Microfiltration
; Nutrients
; Optical tomography
; Organic carbon
; Polymers
; Polysaccharides
; Proteins
; Stream flow
; Ultrafiltration
; Confocal Raman microscopy
; Extracellular concentration
; Extracellular polymeric substances
; Hydraulic resistances
; Membrane filtrations
; Phosphorus limitation
; Physical structures
; Ultra-filtration membranes
; Structure (composition)
英文摘要: The effect of extracellular polymeric substances (EPS) on the meso-scale physical structure and hydraulic resistance of membrane biofilms during gravity driven membrane (GDM) filtration was investigated. Biofilms were developed on the surface of ultrafiltration membranes during dead-end filtration at ultra-low pressure (70 mbar). Biofilm EPS composition (total protein, polysaccharide and eDNA) was manipulated by growing biofilms under contrasting nutrient conditions. Nutrient conditions consisted of (i) a nutrient enriched condition with a nutrient ratio of 100:30:10 (C: N: P), (ii) a phosphorus limitation (C: N: P ratio: 100:30:0), and (iii) a nitrogen limitation (C: N: P ratio: 100:0:10). The structure of the biofilm was characterised at meso-scale using Optical Coherence Tomography (OCT). Biofilm composition was analysed with respect to total organic carbon, total cellular mass and extracellular concentrations of proteins, polysaccharides, and eDNA. 2D-confocal Raman mapping was used to characterise the functional group composition and micro-scale distribution of the biofilms EPS. Our study reveals that the composition of the EPS matrix can determine the meso-scale physical structure of membrane biofilms and in turn its hydraulic resistance. Biofilms grown under P limiting conditions were characterised by dense and homogeneous physical structures with high concentrations of polysaccharides and eDNA. Biofilm grown under nutrient enriched or N limiting conditions were characterised by heterogeneous physical structures with lower concentrations of polysaccharides and eDNA. For P limiting biofilms, 2D-confocal Raman microscopy revealed a homogeneous spatial distribution of anionic functional groups in homogeneous biofilm structures with higher polysaccharide and eDNA concentrations. This study links EPS composition, physical structure and hydraulic resistance of membrane biofilms, with practical relevance for the hydraulic performances of GDM ultrafiltration. © 2018 Elsevier Ltd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112984
Appears in Collections: 气候减缓与适应
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作者单位: Eawag, Swiss Federal Institute of Aquatic Science and Technology, Dübendorf, 8600, Switzerland; ETH Zürich, Institute of Environmental Engineering, Zürich, 8093, Switzerland; Empa - Swiss Federal Institute for Material Science and Technology, Laboratory for Mechanics of Materials and Nanostructures, Feuerwerkerstrasse 39, Thun, CH-3602, Switzerland
Recommended Citation:
Desmond P.,Best J.P.,Morgenroth E.,et al. Linking composition of extracellular polymeric substances (EPS) to the physical structure and hydraulic resistance of membrane biofilms[J]. Water Research,2018-01-01,132