Stoichiometry of removal of natural organic matter by ion exchange

Treavor Boyer, Philip C. Singer

Research output: Contribution to journalArticle

119 Citations (Scopus)

Abstract

Five anion exchange resins, including a magnetic ion exchange (MIEX) resin, were evaluated for removal of Suwannee River Fulvic Acid (SRFA) in the presence of bicarbonate and chloride. The charge density of SRFA, obtained by potentiometric titration, was used to perform charge balances for ion exchange reactions involving SRFA, bicarbonate, and chloride under different solution conditions. The results clearly show the equivalence of SRFA uptake and chloride release by ion exchange. Although the structure of the anion exchange resins did not affect the stoichiometry of the reaction, the polyacrylic resins did exhibit greater removal of SRFA than the polystyrene resins. The hindered removal of SRFA by the polystyrene resins was hypothesized to be a result of size exclusion. The MIEX resin, which has a polyacrylic structure, performed similarly to the other polyacrylic resins. For the MIEX resin, the separation factor for SRFA over chloride was ∼8 times greater than for bicarbonate over chloride. This work provides an improved understanding of the interactions between natural organic matter (NOM), inorganic anions, and anion exchange resins, and should result in more effective applications of ion exchange for the removal of NOM in the treatment of drinking water.

Original languageEnglish (US)
Pages (from-to)608-613
Number of pages6
JournalEnvironmental Science and Technology
Volume42
Issue number2
DOIs
StatePublished - Jan 15 2008
Externally publishedYes

Fingerprint

stoichiometry
Stoichiometry
Biological materials
resin
ion exchange
Ion exchange
Resins
Rivers
fulvic acid
organic matter
Chlorides
Anion Exchange Resins
Acids
Ion Exchange Resins
Ion exchange resins
Negative ions
Bicarbonates
chloride
river
Polystyrenes

ASJC Scopus subject areas

  • Environmental Science(all)
  • Environmental Chemistry
  • Environmental Engineering

Cite this

Stoichiometry of removal of natural organic matter by ion exchange. / Boyer, Treavor; Singer, Philip C.

In: Environmental Science and Technology, Vol. 42, No. 2, 15.01.2008, p. 608-613.

Research output: Contribution to journalArticle

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