Clay-catalyzed reactions of coagulant polymers during water chlorination

Jiunn Fwu Lee, Pao Mei Liao, Chung Kung Lee, Huan Ping Chao, Chin Luen Peng, Cary T. Chiou

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The influence of suspended clay/solid particles on organic-coagulant reactions during water chlorination was investigated by analyses of total product formation potential (TPFP) and disinfection by-product (DBP) distribution as a function of exchanged clay cation, coagulant organic polymer, and reaction time. Montmorillonite clays appeared to act as a catalytic center where the reaction between adsorbed polymer and disinfectant (chlorine) was mediated closely by the exchanged clay cation. The transition-metal cations in clays catalyzed more effectively than other cations the reactions between a coagulant polymer and chlorine, forming a large number of volatile DBPs. The relative catalytic effects of clays/solids followed the order Ti-Mont > Fe-Mont > Cu-Mont > Mn-Mont > Ca-Mont > Na-Mont > quartz > talc. The effects of coagulant polymers on TPFP follow the order nonionic polymer > anionic polymer > cationic polymer. The catalytic role of the clay cation was further confirmed by the observed inhibition in DBP formation when strong chelating agents (o-phenanthroline and ethylenediamine) were added to the clay suspension. Moreover, in the presence of clays, total DBPs increased appreciably when either the reaction time or the amount of the added clay or coagulant polymer increased. For volatile DBPs, the formation of halogenated methanes was usually time-dependent, with chloroform and dichloromethane showing the greatest dependence.

Original languageEnglish
Pages (from-to)381-387
Number of pages7
JournalJournal of Colloid And Interface Science
Volume270
Issue number2
DOIs
Publication statusPublished - 2004 Feb 15

Fingerprint

Coagulants
Chlorination
Polymers
Clay
Water
Cations
Positive ions
ethylenediamine
Disinfection
Chlorine
Byproducts
clay
Talc
Bentonite
Disinfectants
Quartz
Organic polymers
Methylene Chloride
Methane
Dichloromethane

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

Cite this

Lee, Jiunn Fwu ; Liao, Pao Mei ; Lee, Chung Kung ; Chao, Huan Ping ; Peng, Chin Luen ; Chiou, Cary T. / Clay-catalyzed reactions of coagulant polymers during water chlorination. In: Journal of Colloid And Interface Science. 2004 ; Vol. 270, No. 2. pp. 381-387.
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Clay-catalyzed reactions of coagulant polymers during water chlorination. / Lee, Jiunn Fwu; Liao, Pao Mei; Lee, Chung Kung; Chao, Huan Ping; Peng, Chin Luen; Chiou, Cary T.

In: Journal of Colloid And Interface Science, Vol. 270, No. 2, 15.02.2004, p. 381-387.

Research output: Contribution to journalArticle

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AU - Lee, Jiunn Fwu

AU - Liao, Pao Mei

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AU - Chiou, Cary T.

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AB - The influence of suspended clay/solid particles on organic-coagulant reactions during water chlorination was investigated by analyses of total product formation potential (TPFP) and disinfection by-product (DBP) distribution as a function of exchanged clay cation, coagulant organic polymer, and reaction time. Montmorillonite clays appeared to act as a catalytic center where the reaction between adsorbed polymer and disinfectant (chlorine) was mediated closely by the exchanged clay cation. The transition-metal cations in clays catalyzed more effectively than other cations the reactions between a coagulant polymer and chlorine, forming a large number of volatile DBPs. The relative catalytic effects of clays/solids followed the order Ti-Mont > Fe-Mont > Cu-Mont > Mn-Mont > Ca-Mont > Na-Mont > quartz > talc. The effects of coagulant polymers on TPFP follow the order nonionic polymer > anionic polymer > cationic polymer. The catalytic role of the clay cation was further confirmed by the observed inhibition in DBP formation when strong chelating agents (o-phenanthroline and ethylenediamine) were added to the clay suspension. Moreover, in the presence of clays, total DBPs increased appreciably when either the reaction time or the amount of the added clay or coagulant polymer increased. For volatile DBPs, the formation of halogenated methanes was usually time-dependent, with chloroform and dichloromethane showing the greatest dependence.

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