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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/98569


    Title: High-level deliquoring of activated sludge by ultrahigh-pressure expression combined with flocculation
    Authors: Iritani, E.;N. Katagiri;T. Washizu;Hwang, K.J.
    Contributors: 淡江大學化學工程與材料工程學系
    Keywords: Expression;Ultrahigh pressure;Activated sludge;Moisture content;Deliquoring;Consolidation
    Date: 2014-06-14
    Issue Date: 2014-08-14 10:19:37 (UTC+8)
    Publisher: Kidlington: Pergamon Press
    Abstract: The efficient deliquoring process has been developed for achieving high-rate and high-degree deliquoring of municipal excess activated sludge, which exhibits relatively low dewaterability. In the method developed, low-pressure filtration combined with flocculation led to high-rate deliquoring of sludge due to the formation of large flocs. Subsequently, ultrahigh-pressure expression combined with water permeation through the filter cake which promoted the re-dispersion of flocs in the cake resulted in high-degree deliquoring of the cake. It should be noted that the moisture content in the compressed cake was finally reduced to 31 wt% by expression operation under action of an ultrahigh pressure of 15 MPa. This extremely low value of the cake moisture content implies that the liquid contained within the microorganism cells was partially removed by the mechanical pressure when the ultrahigh pressure is applied to the cake in the course of expression. The relation between the equilibrium porosity in the compressed cake and solid compressive pressure was empirically represented by a power function. The kinetics of ultrahigh-pressure expression such as the time variation of the moisture content in the compressed cake was accurately described by combining the multi-stage creep model with the modified Terzaghi model describing the primary consolidation.
    Relation: Chemical Engineering Science 112, pp.1-9
    DOI: 10.1016/j.ces.2014.03.008
    Appears in Collections:[化學工程與材料工程學系暨研究所] 期刊論文

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