Co-conditioning and dewatering of alum sludge and waste activated sludge

Co-conditioning and dewatering behaviors of alum sludge and waste activated sludge were investigated. Two different sludges were mixed at various ratios (2:1; 1:1; 1:2; 1:4) for study. Capillary suction time (CST) and specific resistance to filtration (SRF) were utilized to assess sludge dewaterabil...

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Bibliographic Details
Published in:Water Science & Technology 2004-01, Vol.50 (9), p.41-48
Main Authors: Lai, J Y, Liu, J C
Format: Article
Language:English
Subjects:
Activated sludge
Alum
Alum Compounds - chemistry
Alum sludge
Aluminum Hydroxide - chemistry
Conditioning
Dewatering
Dosage
Electrical resistivity
Filtration
Flocculation
Polyelectrolytes
Sewage - chemistry
Sludge
Sludge disposal
Sludge drying
Sludge treatment
Suction
Taiwan
Waste disposal
Waste Management - methods
Waste Products
Water
Water treatment plants
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Summary:Co-conditioning and dewatering behaviors of alum sludge and waste activated sludge were investigated. Two different sludges were mixed at various ratios (2:1; 1:1; 1:2; 1:4) for study. Capillary suction time (CST) and specific resistance to filtration (SRF) were utilized to assess sludge dewaterability. Relatively speaking, waste activated sludge, though of higher solid content, was more difficult to be dewatered than alum sludge. It was found that sludge dewaterability and settlability became better with increasing fraction of alum sludge in the mixed sludge. Dosage required of the cationic polyelectrolyte (KP-201C) for dewatering was reduced as well. It is proposed that alum sludge acts as skeleton builder in the mixed sludge, and renders the mixed sludge more incompressible which is beneficial for sludge dewatering. Implications of the results of the study to the sludge management plan for Taipei City that generates both alum sludge and waste activated sludge at significant amount are also discussed. The current sludge treatment and disposal plan in Metropolitan Taipei could be made more cost-effective.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2004.0530