An equilibrium ion-exchange study on the removal of NH4 + ion from aqueous effluent using clinoptilolite

N. P. Hankins, S. Pliankarom, Nidal Hilal

    Research output: Contribution to journalArticle

    Abstract

    The present work, of concerns an equilibrium study of naturally occurring clinoptilolite as an ion-exchange medium; the clinoptilolite has been used for the removal of the NH4 + ion from a model aqueous effluent of the Landfill Leachate Assisted Froth Flotation (LLAFF) process. The other principal cations involved were sodium and calcium, and the anion was chloride. A number of experimental tests with constant ionic strength in solution were conducted; these were performed to further validate the feasibility of using clinoptilolite to remove NH4 + ion from the LLAFF effluent. The experimental data obtained were well described by the law of mass action. A binary-component equilibrium study revealed a value for the binary separation factor αNH4+, Na+ of 5.5; this value was relatively unaffected by the total salinity under the experimental conditions. Values for the intra-particle diffusion coefficient and the maximum ion-exchange capacity were also obtained; the latter was affected by total salinity. Results from the binary-component and multi-component studies have revealed the selectivity of clinoptilolite for ammonium over other cations under the compositional conditions of the model LLAFF effluent: The selectivity sequence is K + > NH4 + > Na+ > > Ca2+. The factors that influence the selectivity of clinoptilolite for NH4 + in LLAFF effluent have been ascertained; in particular, it has been found that small quantities of Ca2+ in the effluent have a deleterious effect on both selectivity toward ammonium and ammonium ion-exchange capacity.

    Original languageEnglish (US)
    Pages (from-to)3639-3663
    Number of pages25
    JournalSeparation Science and Technology
    Volume39
    Issue number15
    DOIs
    StatePublished - Dec 6 2004

    Fingerprint

    Chemical Water Pollutants
    Froth flotation
    Effluents
    Ion exchange
    Land fill
    Ions
    Ammonium Compounds
    Cations
    Positive ions
    Ionic strength
    Anions
    Chlorides
    Calcium
    Negative ions
    Sodium
    clinoptilolite

    Keywords

    • Ammonium ion removal
    • Aqueous effluent
    • Clinoptilolite
    • Competing cations
    • Ion-exchange equilibrium
    • Mass action
    • Selectivity sequence
    • Separation factor

    ASJC Scopus subject areas

    • Chemistry(all)
    • Process Chemistry and Technology
    • Chemical Engineering(all)
    • Filtration and Separation

    Cite this

    An equilibrium ion-exchange study on the removal of NH4 + ion from aqueous effluent using clinoptilolite. / Hankins, N. P.; Pliankarom, S.; Hilal, Nidal.

    In: Separation Science and Technology, Vol. 39, No. 15, 06.12.2004, p. 3639-3663.

    Research output: Contribution to journalArticle

    Hankins, N. P. ; Pliankarom, S. ; Hilal, Nidal. / An equilibrium ion-exchange study on the removal of NH4 + ion from aqueous effluent using clinoptilolite. In: Separation Science and Technology. 2004 ; Vol. 39, No. 15. pp. 3639-3663.
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