Investigation and visualization of internal flow through particle aggregates and microbial flocs using particle image velocimetry

CORC > 生态环境研究中心 > 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

	Investigation and visualization of internal flow through particle aggregates and microbial flocs using particle image velocimetry
	Xiao, Feng1,2 ; Lam, Kit Ming 1; Li, Xiao-yan 1
刊名	JOURNAL OF COLLOID AND INTERFACE SCIENCE
	2013-05-01
卷号	397 页码:163-168
关键词	Activated sludge Aggregates Fluid collection efficiency Fractal dimension Particle image velocimetry (PIV) Permeability Streamlines
英文摘要	An advanced particle-tracking and flow-visualization technology, particle image velocimetry (PIV), was utilized to investigate the hydrodynamic properties of large aggregates in water:The laser-based PIV system was used together with a settling column to capture the streamlines around two types of aggregates: latex particle aggregates and activated sludge (AS) flocs. Both types of the aggregates were highly porous and fractal with fractal dimensions of 2.13 +/- 0.31 for the latex particle aggregates (1210-2144 mu m) and 1.78 +/- 0.24 for the AS flocs (1265-3737 mu m). The results show that PIV is a powerful flow visualization technique capable of determining flow field details at the micrometer scale around and through settling aggregates and flocs. The PIV streamlines provided direct experimental proof of internal flow through the aggregate interiors. According to the PIV images, fluid collection efficiency ranged from 0.052 to 0.174 for the latex particle aggregates and from 0.008 to 0.126 for AS flocs. AS flocs are apparently less permeable than the particle aggregates, probably due to the extracellular polymeric substances (EPSs) produced by bacteria clogging the pores within the flocs. The internal permeation of fractal aggregates and bio-flocs would enhance flocculation between particles and material transport into the aggregates. (C) 2013 Elsevier Inc. All rights reserved.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Chemistry, Physical
研究领域[WOS]	Chemistry
关键词[WOS]	ACTIVATED-SLUDGE FLOCS ; HYDRODYNAMIC PROPERTIES ; DIFFERENTIAL SEDIMENTATION ; COLLISION FREQUENCIES ; CREEPING FLOW ; DRAG FORCE ; SHEAR-FLOW ; PERMEABILITY ; SIZE ; REACTORS
收录类别	SCI
语种	英语
WOS记录号	WOS:000316776600021
公开日期	2016-02-26
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/24654]
专题	生态环境研究中心_环境水质学国家重点实验室
作者单位	1.Univ Hong Kong, Dept Civil Engn, Environm Engn Res Ctr, Hong Kong, Hong Kong, Peoples R China 2.Chinese Acad Sci, State Key Lab Environm Aquat Chem, Ecoenvironm Sci Res Ctr, Beijing 100085, Peoples R China
推荐引用方式 GB/T 7714	Xiao, Feng,Lam, Kit Ming,Li, Xiao-yan. Investigation and visualization of internal flow through particle aggregates and microbial flocs using particle image velocimetry[J]. JOURNAL OF COLLOID AND INTERFACE SCIENCE,2013,397:163-168.
APA	Xiao, Feng,Lam, Kit Ming,&Li, Xiao-yan.(2013).Investigation and visualization of internal flow through particle aggregates and microbial flocs using particle image velocimetry.JOURNAL OF COLLOID AND INTERFACE SCIENCE,397,163-168.
MLA	Xiao, Feng,et al."Investigation and visualization of internal flow through particle aggregates and microbial flocs using particle image velocimetry".JOURNAL OF COLLOID AND INTERFACE SCIENCE 397(2013):163-168.