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    Impact of various physico-chemical parameters on spontaneous nucleation of struvite (MgNH4PO4.6H2O) formation in a wastewater treatment plant: kinetic and nucleation mechanism

    Access Status
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    Authors
    Ariyanto, E.
    Ang, Ha Ming
    Sen, Tushar Kanti Sen
    Date
    2013
    Type
    Journal Article
    
    Metadata
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    Citation
    Ariyanto, Eko and Ang, Ha Ming and Sen, Tushar Kanti Sen. 2013. Impact of various physico-chemical parameters on spontaneous nucleation of struvite (MgNH4PO4.6H2O) formation in a wastewater treatment plant: Kinetic and nucleation mechanism. Desalination and Water Treatment. Advance online publication. DOI:10.1080/19443994.2013.821042
    Source Title
    Desalination and Water Treatment
    DOI
    10.1080/19443994.2013.821042
    ISSN
    1944-3994
    URI
    http://hdl.handle.net/20.500.11937/5999
    Collection
    • Curtin Research Publications
    Abstract

    In this study, the effect of various physico-chemical parameters such as supersaturation, temperature and pH, and the presence of foreign ion on the nucleation of struvite formation in a wastewater treatment plant were studied experimentally. Mechanism of nucleation kinetics of struvite (MgNH4PO4.6H2O) formation has been identified by thermodynamic parameters study. The time taken for nucleation to occur (often indicated by the induction time) is a measure of struvite nucleation. It was found that induction time decreased with an increase in supersaturation, temperature and pH but increased with the presence of excess chloride (Cl-) ion. Interfacial energy of two nucleation mechanisms (gamma s, hom and gamma s, het), homogeneous and heterogeneous, increased with an increase in solution pH for all temperatures whereas interfacial energy of crystals increased with decrease in temperature. Thermodynamic parameters such as activation energy and interfacial energy were calculated based on rate of nucleation for both homogeneous and heterogeneous crystallisation. Finally, inhabitation of struvite nucleation by presence of foreign ion has been reported here.

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