Combined effect of reversible flocculation and ultrahigh pressure in high-level deliquoring attained by expression of activated sludge

doi:10.1252/kakoronbunshu.40.396

機構典藏 > College of Engineering > Graduate Institute & Department of Chemical and Materials Engineering > Journal Article > Item 987654321/100243

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Title:	Combined effect of reversible flocculation and ultrahigh pressure in high-level deliquoring attained by expression of activated sludge
Authors:	E. Iritani;N. Katagiri;T. Washizu;K.J. Hwang=黃國楨;T.W. Cheng
Contributors:	化學工程與材料工程學系暨研究所
Keywords:	Ultrahigh-Pressure Expression;Reversible Flocculation;Deliquoring;Activated Sludge;Cake Moisture Content
Date:	2014-09
Issue Date:	2015-02-10 12:55:38 (UTC+8)
Publisher:	Society of Chemical Engineering of Japan
Abstract:	High-level deliquoring of excess municipal activated sludge was accomplished by use of an inorganic flocculant, polyaluminum chloride (PACl), and an organic polymer flocculant, Kurifix. The deliquoring process consisted of filtration of flocculated sludge followed by ultrahigh-pressure expression combined with water permeation through the filter cake, resulting in the re-distribution of flocs in the filter cake. Whereas the use of Kurifix increased the filtration rate significantly more than PACl, it decreased the expression rate, particularly at low expression pressure. As the expression pressure increased, the cake moisture content decreased more remarkably in the case of PACl compared with Kurifix. Of particular interest is that an ultrahigh pressure of 50 MPa decreased the cake moisture content to 23.7 wt% at the end of expression. The kinetics of ultrahigh-pressure expression such as the variations with time of the average consolidation ratio and average cake moisture content was well elucidated by considering a Terzaghi type of primary consolidation followed by a mainly two-stage creep phenomenon. Consequently, the creep effect was marked in the case of Kurifix, particularly at low expression pressure. Moreover, the modified consolidation coefficient increased with the expression pressure and remained constant above a critical expression pressure, which depended on the flocculant: ca. 5 MPa for PACl and ca. 10 MPa for Kurifix.
Relation:	Kagaku Kogaku Ronbunshu 40(5), p.396-403
DOI:	10.1252/kakoronbunshu.40.396
Appears in Collections:	[Graduate Institute & Department of Chemical and Materials Engineering] Journal Article

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