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    Removal of ammonium from greywater using natural zeolite

    Access Status
    Fulltext not available
    Authors
    Widiastuti, Nurul
    Wu, Hongwei
    Ang, Ha Ming
    Zhang, D.
    Date
    2011
    Type
    Journal Article
    
    Metadata
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    Citation
    Widiastuti, Nurul and Wu, Hongwei and Ang, Ha Ming and Zhang, Dongke. 2011. Removal of ammonium from greywater using natural zeolite. Desalination. 277: pp. 15-23.
    Source Title
    Desalination
    DOI
    10.1016/j.desal.2011.03.030
    ISSN
    00119164
    School
    Centre for Fuels and Energy (COE)
    URI
    http://hdl.handle.net/20.500.11937/13955
    Collection
    • Curtin Research Publications
    Abstract

    This paper focuses on the effectiveness of removing ammonium ion and the theoretical aspects of adsorption including adsorption isotherm, kinetics and thermodynamics as well as desorption–regeneration studies. Results have demonstrated that natural zeolite shows good performance with up to 97% for ammonium removal depending on contact time, zeolite loading, initial ammonium concentration and pH. The adsorption kinetics is best approximated by the pseudo-second-order model, whereas the adsorption isotherm results indicated that Freundlich model provides the best fit for the equilibrium data. Furthermore, with regard to thermodynamic parameters, it was found that Gibbs free energy change or adsorption energy (ΔG°), − 19.52 kJ/mol at 25 °C, − 20.45 kJ/mol at 35 °C and − 22.91 kJ/mol at 45 °C is negative indicating the spontaneous nature of the adsorption process, whereas the enthalpy change (ΔH°), 30.96 kJ/mol is positive indicating endothermic adsorption process. The entropy change (ΔS°), 0.169 kJ/(mol K) at 25 °C is also positive indicating increasing randomness at the solid-solution interface during adsorption. In addition, the desorption–regeneration studies demonstrated that desorption of ammonium on the zeolite is sufficiently high using NaCl solutions.

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