Comparison of coagulation performance and floc properties using a novel zirconium coagulant against traditional ferric and alum coagulants

Jarvis, Peter, Sharp, Emma, Pidou, Marc, Molinder, Roger, Parsons, Simon A. and Jefferson, Bruce (2012) Comparison of coagulation performance and floc properties using a novel zirconium coagulant against traditional ferric and alum coagulants. Water Research, 46 13: 4179-4187.


Author Jarvis, Peter
Sharp, Emma
Pidou, Marc
Molinder, Roger
Parsons, Simon A.
Jefferson, Bruce
Title Comparison of coagulation performance and floc properties using a novel zirconium coagulant against traditional ferric and alum coagulants
Journal name Water Research   Check publisher's open access policy
ISSN 0043-1354
1879-2448
Publication date 2012-09-01
Sub-type Article (original research)
DOI 10.1016/j.watres.2012.04.043
Volume 46
Issue 13
Start page 4179
End page 4187
Total pages 9
Place of publication London, United Kingdom
Publisher IWA Publishing
Collection year 2013
Language eng
Abstract Coagulation in drinking water treatment has relied upon iron (Fe) and aluminium (Al) salts throughout the last century to provide the bulk removal of contaminants from source waters containing natural organic matter (NOM). However, there is now a need for improved treatment of these waters as their quality deteriorates and water quality standards become more difficult to achieve. Alternative coagulant chemicals offer a simple and inexpensive way of doing this. In this work a novel zirconium (Zr) coagulant was compared against traditional Fe and Al coagulants. The Zr coagulant was able to provide between 46 and 150% lower dissolved organic carbon (DOC) residual in comparison to the best traditional coagulant (Fe). In addition floc properties were significantly improved with larger and stronger flocs forming when the Zr coagulant was used with the median floc sizes being 930 μm for Zr; 710 μm for Fe and 450 μm for Al. In pilot scale experiments, a similar improved NOM and particle removal was observed. The results show that when optimised for combined DOC removal and low residual turbidity, the Zr coagulant out-performed the other coagulants tested at both bench and pilot scale.
Keyword Natural organic matter
NOM
Coagulation
Water treatment
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2013 Collection
Advanced Water Management Centre Publications
 
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Created: Thu, 19 Jul 2012, 13:41:10 EST by Dr Marc Pidou on behalf of Advanced Water Management Centre