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	Fragmentation of wastewater sludge floc by planar ice front
	Tao, T ; Peng, XF ; Lee, DJ
	2010-05-11 ; 2010-05-11
关键词	freezing thawing floc interface force EXCESS ACTIVATED SLUDGES INTERFACE PARTICLES Chemistry, Physical
中文摘要	Floc size has substantial impact on sludge dewaterability, which might be increased or reduced after freezing and thawing. It is commonly assumed that floc size would be increased by low-speed freezing, with a planar ice front rejecting most floes ahead of it to form large aggregates. We demonstrate in this work that an advancing planar ice front can not only engulf an activated sludge floc of size 3030 pm, but also fragment it. During flee freezing, when the ice engulfed a thin layer of floc, the latter would be pulled apart vertically by the action of the former. This particular portion of floc was then axially elongated and fixed in the frozen layer, with accumulated force pushing upward. In the present test the floe's vertical length was increased by over 92% and its width decreased by 37% over freezing. The force measurement and floc morphology tracking revealed that the force gradient that pulled apart the floc was 0.0027 N/m. The floc under investigation was fragmented at the point where the normal stress acting on the interior network exceeded 8 Pa. (c) 2005 Elsevier Inc. All rights reserved.
语种	英语 ; 英语
出版者	ACADEMIC PRESS INC ELSEVIER SCIENCE ; SAN DIEGO ; 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/25833]
专题	清华大学
推荐引用方式 GB/T 7714	Tao, T,Peng, XF,Lee, DJ. Fragmentation of wastewater sludge floc by planar ice front[J],2010, 2010.
APA	Tao, T,Peng, XF,&Lee, DJ.(2010).Fragmentation of wastewater sludge floc by planar ice front..
MLA	Tao, T,et al."Fragmentation of wastewater sludge floc by planar ice front".(2010).

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