DEWATERING METHOD OF SLUDGE

PROBLEM TO BE SOLVED: To provide a dewatering method of sludge that can reduce a moisture content of dewatering cake even when an addition amount of fibers is small.SOLUTION: A dewatering method of sludge is that at least one kind coagulant is added to sludge containing at least 1 ppm of a material...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	KAWAE AYANO, TANI YUKIO
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY METALLURGY PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL SEPARATION TRANSPORTING TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a dewatering method of sludge that can reduce a moisture content of dewatering cake even when an addition amount of fibers is small.SOLUTION: A dewatering method of sludge is that at least one kind coagulant is added to sludge containing at least 1 ppm of a material having agglutination and a positive charge to form flocs, then fibers having electric charge are added, sludge is agglomerated by controlling so that a proportion of the longest side to the shortest side in floc shapes is in a range of 10:1-1:1, the number of flocs having 0.1 mm-15 cmas a volume is at least 5% with respect to the total floc number, and flocs are maintained until dehydration, and the dewatering method of sludge described in claim 1 is that the sludge is added with at least one kind coagulant to form flocs, then is added with fibers having electric charge, then a coagulant is added.