Threshold flux for shear-enhanced nanofiltration: Experimental observation in dairy wastewater treatment

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	Threshold flux for shear-enhanced nanofiltration: Experimental observation in dairy wastewater treatment
	Luo, Jianquan 1; Ding, Luhui 1; Wan, Yinhua 2; Jaffrin, Michel Y.3
刊名	JOURNAL OF MEMBRANE SCIENCE
	2012-08-01
卷号	409 期号:0 页码:276-284
关键词	Critical flux Sustainable flux Flux decline Fouling Wastewater treatment
ISSN号	0376-7388
通讯作者	Luo, JQ
英文摘要	High and stable permeate flux can be obtained with shear-enhanced nanofiltration (NF) in model dairy wastewater treatment. In order to sustain such flux in long-term operation, critical fouling conditions should be studied and an optimum flux needs to be selected. Based on resistance-in-series and particle deposition models, a threshold flux was proposed to make a distinction between low and high fouling rates. At and below threshold flux, adsorption and reversible fouling are almost stable, and the fouling rate is low and nearly constant, irrespective of permeate flux; while above it, flux declines markedly with increasing flux mainly due to incremental reversible fouling. Flux remained quite stable with slight fouling (<5%) in 6 h operation at threshold flux, up to 6.1 x 10(-5) ms(-1) at shear rate of 1.81 x 10(5) s(-1) for diluted milk. Flux anomaly occurred in operations above threshold flux and fouling was more important (permeability loss >20% for undiluted milk). This threshold flux is determined by pressure stepping experiments as the point above which flux ceases to increase linearly with transmembrane pressure (TMP). Each flux step only needs to last a few minutes to ensure reversible fouling stabilization at high shear rate. In shear-enhanced filtration, these threshold fluxes are, of course, larger than critical ones, and more compatible with industrial expectations. It is concluded that the separation performance of membranes should be evaluated at or below threshold flux to eliminate the effect of fouling, and the effect of feed characteristic on membrane fouling should be investigated above threshold flux, while operating at threshold flux is recommended for industrial long-term operation. (C) 2012 Elsevier B.V. All rights reserved.
WOS标题词	Science & Technology ; Technology ; Physical Sciences
类目[WOS]	Engineering, Chemical ; Polymer Science
研究领域[WOS]	Engineering ; Polymer Science
关键词[WOS]	EXTREME HYDRAULIC CONDITIONS ; LIMITING FLUX ; PAPER-INDUSTRY ; NF MEMBRANES ; HUMIC-ACID ; FILTRATION ; MICROFILTRATION ; MODEL ; EFFLUENTS ; MILK
收录类别	SCI
语种	英语
WOS记录号	WOS:000303775400030
公开日期	2013-10-18
内容类型	期刊论文
版本	出版稿
源URL	[http://ir.ipe.ac.cn/handle/122111/3814]
专题	过程工程研究所_生化工程国家重点实验室
作者单位	1.Univ Technol Compiegne, EA TIMR 4297, F-60205 Compiegne, France 2.Chinese Acad Sci, Inst Proc Engn, Natl Key Lab Biochem Engn, Beijing 100190, Peoples R China 3.Univ Technol Compiegne, UMR 7338, F-60205 Compiegne, France
推荐引用方式 GB/T 7714	Luo, Jianquan,Ding, Luhui,Wan, Yinhua,et al. Threshold flux for shear-enhanced nanofiltration: Experimental observation in dairy wastewater treatment[J]. JOURNAL OF MEMBRANE SCIENCE,2012,409(0):276-284.
APA	Luo, Jianquan,Ding, Luhui,Wan, Yinhua,&Jaffrin, Michel Y..(2012).Threshold flux for shear-enhanced nanofiltration: Experimental observation in dairy wastewater treatment.JOURNAL OF MEMBRANE SCIENCE,409(0),276-284.
MLA	Luo, Jianquan,et al."Threshold flux for shear-enhanced nanofiltration: Experimental observation in dairy wastewater treatment".JOURNAL OF MEMBRANE SCIENCE 409.0(2012):276-284.