Coagulation performance and floc characteristics of polytitanium tetrachloride (PTC) compared with titanium tetrachloride (TiCl<inf>4</inf>) and iron salts in humic acid-kaolin synthetic water treatment

Chekli, L; Galloux, J; Zhao, YX; Gao, BY; Shon, HK

Coagulation performance and floc characteristics of polytitanium tetrachloride (PTC) compared with titanium tetrachloride (TiCl<inf>4</inf>) and iron salts in humic acid-kaolin synthetic water treatment

Chekli, L

Galloux, J Zhao, YX Gao, BY Shon, HK

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Publication Type:: Journal Article
Citation:: Separation and Purification Technology, 2015, 142 pp. 155 - 161
Issue Date:: 2015-03-04

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Field	Value	Language
dc.contributor.author	Chekli, L https://orcid.org/0000-0002-9353-943X	en_US
dc.contributor.author	Galloux, J	en_US
dc.contributor.author	Zhao, YX	en_US
dc.contributor.author	Gao, BY	en_US
dc.contributor.author	Shon, HK https://orcid.org/0000-0002-3777-7169	en_US
dc.date.available	2020-05-25T19:07:08Z
dc.date.issued	2015-03-04	en_US
dc.identifier.citation	Separation and Purification Technology, 2015, 142 pp. 155 - 161	en_US
dc.identifier.issn	1383-5866	en_US
dc.identifier.uri	http://hdl.handle.net/10453/36370
dc.description.abstract	© 2015 Elsevier B.V. All rights reserved. Polymeric metal coagulants are increasingly used to improve the coagulation/flocculation process efficiency, yet the research on the development of titanium and particularly polytitanium salts remains very limited. In this study, the performance of recently developed polytitanium tetrachloride (PTC) coagulant was compared with both titanium tetrachloride (TiCl4) and a commonly used coagulant, ferric chloride (FeCl3) in terms of water quality parameters and floc properties. Compared with FeCl3 coagulant, titanium-based coagulants had broader region of good flocculation in terms of pH and coagulant dose. Further, they achieved higher removal of UV254 and turbidity but lower dissolved organic carbon (DOC) removal. Charge neutralisation, physical entrapment of colloids within coagulant precipitates and adsorption were found to be the main coagulation mechanisms for TiCl4 while sweep coagulation and adsorption were found to play a more important role for both FeCl3 and PTC. The aggregated flocs formed by PTC flocculation had the largest floc size of around 836 μm with the highest floc growth rate. A little distinction of the floc strength factor was found among the coagulants tested (i.e. 44.8%, 44.2% and 38.9% for FeCl3, TiCl4 and PTC respectively) while TiCl4 coagulant yielded the flocs with the highest floc recovery factor. This study indicates that Ti-based coagulants are effective and promising coagulants for water purification. Besides, the resulted flocculated sludge can be recycled and produce functional TiO2 photocatalyst which is a significant advantage over conventional coagulants.	en_US
dc.relation	http://purl.org/au-research/grants/arc/DP130103129
dc.relation.ispartof	Separation and Purification Technology	en_US
dc.relation.isbasedon	10.1016/j.seppur.2014.12.043	en_US
dc.subject.classification	Chemical Engineering	en_US
dc.title	Coagulation performance and floc characteristics of polytitanium tetrachloride (PTC) compared with titanium tetrachloride (TiCl<inf>4</inf>) and iron salts in humic acid-kaolin synthetic water treatment	en_US
dc.type	Journal Article
utslib.citation.volume	142	en_US
utslib.for	0301 Analytical Chemistry	en_US
utslib.for	0904 Chemical Engineering	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CTWW - Centre for Technology in Water and Wastewater Treatment
utslib.copyright.status	open_access
pubs.publication-status	Published	en_US
pubs.volume	142	en_US

Abstract:

© 2015 Elsevier B.V. All rights reserved. Polymeric metal coagulants are increasingly used to improve the coagulation/flocculation process efficiency, yet the research on the development of titanium and particularly polytitanium salts remains very limited. In this study, the performance of recently developed polytitanium tetrachloride (PTC) coagulant was compared with both titanium tetrachloride (TiCl4) and a commonly used coagulant, ferric chloride (FeCl3) in terms of water quality parameters and floc properties. Compared with FeCl3 coagulant, titanium-based coagulants had broader region of good flocculation in terms of pH and coagulant dose. Further, they achieved higher removal of UV254 and turbidity but lower dissolved organic carbon (DOC) removal. Charge neutralisation, physical entrapment of colloids within coagulant precipitates and adsorption were found to be the main coagulation mechanisms for TiCl4 while sweep coagulation and adsorption were found to play a more important role for both FeCl3 and PTC. The aggregated flocs formed by PTC flocculation had the largest floc size of around 836 μm with the highest floc growth rate. A little distinction of the floc strength factor was found among the coagulants tested (i.e. 44.8%, 44.2% and 38.9% for FeCl3, TiCl4 and PTC respectively) while TiCl4 coagulant yielded the flocs with the highest floc recovery factor. This study indicates that Ti-based coagulants are effective and promising coagulants for water purification. Besides, the resulted flocculated sludge can be recycled and produce functional TiO2 photocatalyst which is a significant advantage over conventional coagulants.

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http://hdl.handle.net/10453/36370