Abstract

Low molecular weight (MW) charged organic matter is poorly removed by conventional coagulants but contributes to disinfection byproduct formation during chlorination of drinking waters. We hypothesized that CIEX, a new Al-based hybrid coagulant with ion-exchange functional groups, would be new mechanistic approach to remove low MW organic matter during coagulation and would perform better than polyaluminum chloride (PACl) or metal-salt based coagulants. We measured coagulation performance using dissolved organic carbon (DOC) in a high hardness surface water. CIEX achieved excellent turbidity removal and removed 20% to 46% more DOC than FeCl3, Al2(SO4)3, or PACl, depending on dose. The improved DOC removal was attributable to better removal of low MW organic matter (90% of SA) independent of pH, whereas removal by metal salts was lower (-7 mol NDMA per mol CIEX-N). (Chemical Equation Presented).

Original languageEnglish (US)
Pages (from-to)3897-3904
Number of pages8
JournalEnvironmental Science and Technology
Volume50
Issue number7
DOIs
StatePublished - Apr 5 2016

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Coagulants
ion exchange
Ion exchange
Organic carbon
Molecular weight
Biological materials
dissolved organic carbon
Coagulation
organic matter
coagulation
Salts
Metals
chloride
salt
Disinfection
Chlorination
metal
Turbidity
chlorination
Surface waters

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry

Cite this

Novel Ion-Exchange Coagulants Remove More Low Molecular Weight Organics than Traditional Coagulants. / Zhao, Huazhang; Wang, Lei; Hanigan, David; Westerhoff, Paul; Ni, Jinren.

In: Environmental Science and Technology, Vol. 50, No. 7, 05.04.2016, p. 3897-3904.

Research output: Contribution to journalArticle

Zhao, Huazhang ; Wang, Lei ; Hanigan, David ; Westerhoff, Paul ; Ni, Jinren. / Novel Ion-Exchange Coagulants Remove More Low Molecular Weight Organics than Traditional Coagulants. In: Environmental Science and Technology. 2016 ; Vol. 50, No. 7. pp. 3897-3904.
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