DOI: 10.1016/j.watres.2018.07.019
Scopus记录号: 2-s2.0-85053070133
论文题名: Clogging vs. fouling in immersed membrane bioreactors
作者: Buzatu P. ; Qiblawey H. ; Odai A. ; Jamaleddin J. ; Nasser M. ; Judd S.J.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 144 起始页码: 46
结束页码: 54
语种: 英语
英文关键词: Clogging
; Fouling
; Membrane bioreactors
; Rheology
; Sludge
; Sludging
Scopus关键词: Bioreactors
; Fouling
; Image processing
; Rheology
; Viscosity
; Capillary suction time
; Clogging
; Flat sheet membranes
; Immersed membrane bioreactors
; Membrane bioreactor
; Sludge
; Sludging
; Solids concentrations
; Membranes
; aeration
; bioreactor
; chemical oxygen demand
; concentration (composition)
; digital image
; fouling
; image processing
; industrial waste
; membrane
; operations technology
; permeability
; physical property
; rheology
; sludge
英文摘要: Whilst the fouling of MBR membrane surfaces has been very extensively explored by the academic community, there is an increasingly widespread recognition by practitioners of the issue of clogging of membrane channels with sludge solids, sometimes termed “sludging”. The study undertaken has quantified this phenomenon using a bespoke test cell allowing a flat sheet membrane channel to be viewed directly during operation and the accumulated solids determined by digital image processing. Sludging behaviour has then been correlated both with the sludge properties, from sludge samples taken from both an industrial and municipal MBR, and the permeability decline rate data. The work has revealed the expected trends in fouling propensity, as quantified by the exponent n of the Δp/Δt = m.exp(nJ) correlation from classical flux-step tests. With zero membrane aeration the industrial samples exhibited sludging, the filling of the complete thickness of the membrane channel with sludge solids, whereas for municipal sludge the solids formed a cake layer which did not fill the channel. In the absence of sludging the permeability decline followed the expected pattern of increasing at the elevated soluble COD and capillary suction time values of the industrial sludge, compared with municipal sludge at the same solids concentration range (8–12 g.L−1). However, there was no evident correlation between fouling (permeability decline without sludging) and sludging: incipient sludging did not appear to influence permeability, though can be assumed to negatively impact on long-term operation, or relate to the sCOD concentration. Sludging instead appeared to depend on the sludge physical properties, and primarily the viscosity: sludge samples at high viscosities were found to exhibit a different air-scour pattern to that at normal MLSS concentrations. Outcomes suggest that sludging is caused by rheological conditions promoting bubble coalescence and bubble stream constriction, reducing the exposure of the membrane surface to scouring air. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112477
Appears in Collections: 气候减缓与适应
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作者单位: Gas Processing Center, Qatar University, Qatar; Department of Chemical Engineering, Qatar University, Qatar; Cranfield Water Science Institute, Cranfield University, United Kingdom
Recommended Citation:
Buzatu P.,Qiblawey H.,Odai A.,et al. Clogging vs. fouling in immersed membrane bioreactors[J]. Water Research,2018-01-01,144