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    Study of calcium carbonate and sulfate co-precipitation

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    Type
    Article
    Authors
    Zarga, Y.
    Ben Boubaker, H.
    Ghaffour, NorEddine cc
    Elfil, Hamza
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Environmental Science and Engineering Program
    Water Desalination and Reuse Research Center (WDRC)
    Date
    2013-06
    Permanent link to this record
    http://hdl.handle.net/10754/562790
    
    Metadata
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    Abstract
    Co-precipitation of mineral based salts in scaling is still not well understood and/or thermodynamically well defined in the water industry. This study focuses on investigating calcium carbonate (CaCO3) and sulfate mixed precipitation in scaling which is commonly observed in industrial water treatment processes including seawater desalination either by thermal-based or membrane-based processes. Co-precipitation kinetics were studied carefully by monitoring several parameters simultaneously measured, including: pH, calcium and alkalinity concentrations as well as quartz microbalance responses. The CaCO3 germination in mixed precipitation was found to be different than that of simple precipitation. Indeed, the co-precipitation of CaCO3 germination time was not anymore related to supersaturation as in a simple homogenous precipitation, but was significantly reduced when the gypsum crystals appeared first. On the other hand, the calcium sulfate crystals appear to reduce the energetic barrier of CaCO3 nucleation and lead to its precipitation by activating heterogeneous germination. However, the presence of CaCO3 crystals does not seem to have any significant effect on gypsum precipitation. IR spectroscopy and the Scanning Electronic Microscopy (SEM) were used to identify the nature of scales structures. Gypsum was found to be the dominant precipitate while calcite and especially vaterite were found at lower proportions. These analyses showed also that gypsum crystals promote calcite crystallization to the detriment of other forms. © 2013 Elsevier Ltd.
    Citation
    Zarga, Y., Ben Boubaker, H., Ghaffour, N., & Elfil, H. (2013). Study of calcium carbonate and sulfate co-precipitation. Chemical Engineering Science, 96, 33–41. doi:10.1016/j.ces.2013.03.028
    Publisher
    Elsevier BV
    Journal
    Chemical Engineering Science
    DOI
    10.1016/j.ces.2013.03.028
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.ces.2013.03.028
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Environmental Science and Engineering Program; Water Desalination and Reuse Research Center (WDRC)

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