Effects of Acidification on Dewaterability and Aluminum Concentration of Alum Sludge

This study utilizes the Terzaghi-Voigt model to characterize the effects of acidification on the dewaterability of alum sludge. Alum sludge, which was obtained from the sedimentation basins of a water treatment plant using poly aluminum chloride as coagulant, was acidified to different pH levels wit...

Full description

Saved in:
Bibliographic Details
Published inSeparation science and technology Vol. 45; no. 8; pp. 1165 - 1169
Main Authors Huang, Shanghao, Chen, Jiann-Long, Chiang, Kung-Yuh, Wu, Chih-Chao
Format Journal Article
LanguageEnglish
Published Taylor & Francis Group 01.01.2010
Subjects
Acidification
Alum
alum sludge
Aluminum
Aluminum chlorides
creeping factor
dewaterability
Dewatering (separation process)
expression
secondary consolidation
Sedimentation
Sludge
Online AccessGet full text

Cover

More Information
Summary:This study utilizes the Terzaghi-Voigt model to characterize the effects of acidification on the dewaterability of alum sludge. Alum sludge, which was obtained from the sedimentation basins of a water treatment plant using poly aluminum chloride as coagulant, was acidified to different pH levels with sulfuric acid. The dewaterability of the acidified sludge was characterized by expression tests. The results show dewaterability enhancement was insignificant until pH was below 4. Further improvement in dewaterability can be achieved by polymer conditioning. The Terzaghi-Voigt model can be applied to explain the difference in dewaterability between acidified and original sludges. Results also show dissolved aluminum concentrations were controlled by minerals in the influent rather than amorphous aluminum hydroxide.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0149-6395
1520-5754
DOI:10.1080/01496391003734631