Compression characteristics of excess activated sludges treated by freezing-and-thawing process.
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概要
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Excess activated sludge is very difficult to be filtered, but its solid–liquid separation characteristics can be improved by a freezing-and-thawing process. In this study, centrifugal and the gravitational settling experiments were done by using unfrozen and frozen activated sludges.<BR>An equation for the average solid compressive pressure ((<I>p</I><SUB>s</SUB>)<SUB>av</SUB>) in the sediment zone was derived, based on the general equation for the local compression characteristics of a solid–liquid mixture. Also, the relationship between (<I>p</I><SUB>s</SUB>)<SUB>av</SUB> and the average porosity ((<I>ε</I><SUB>s</SUB>)<SUB>av</SUB>) in the sediment zone (1 – (<I>ε</I><SUB>s</SUB>)<SUB>av</SUB>) = <I>E</I>(<I>p</I><SUB>s</SUB>)<SUB>av</SUB><SUP><I>β</I></SUP>; <I>E</I> and <I>β</I> = constants) was confirmed by centrifugal and the gravitational settling experiments.<BR>The order of magnitude of (<I>ε</I>)<SUB>av</SUB> was unfrozen sample < fast-frozen sample < slow-frozen sample. This order was consistent with that of the average specific filtration resistance obtained from the constant-pressure filtration experiments reported in a previous paper.
- The Society of Chemical Engineers, Japanの論文
著者
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KAWASAKI Kenji
Department of Applied Chemistry, Ehime University
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Mizukawa Yuichi
Department Of Applied Chemistry Ehime University
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Matsuda Akira
Department Of Applied Chemistry Ehime University
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Matsuda Akira
Department of Applied Chemistry, Ehime University
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