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  • 标题:Chemical Equilibrium Model of Struvite Precipitation from Anaerobic Digester Effluents
  • 本地全文:下载
  • 作者:Mustafa Türker, Ipek Çelen
  • 期刊名称:Turkish Journal of Engineering and Environmental Sciences
  • 印刷版ISSN:1300-0160
  • 电子版ISSN:1303-6157
  • 出版年度:2011
  • 卷号:35
  • 期号:01
  • DOI:10.3906/muh-1008-15
  • 出版社:Scientific and Technical Research Council of Turkey
  • 摘要:

    This project investigated the usefulness of a chemical equilibrium model to predict the extent of ammonia
    removal as struvite from the effluent of anaerobic digester treating molasses-based industrial wastewater.
    The chemical equilibrium model was established by taking into account the activity coefficient and thermodynamic
    properties of potential compounds that may coprecipitate. It was considered that struvite was the
    only potential compound that precipitated under the conditions studied. pKs value of struvite was estimated
    by fitting the model predictions to the experimental results and found to be between 11 and 12 when the
    temperature is kept at 37 . C, at different Mg2+ :NH+
    4 :PO3- 4 ratios and pH values which are lower than
    those reported in the literature. This indicates that struvite is more soluble in the wastewater studied here.
    The analysis of the precipitate and model predictions suggest that there is another compound present in the
    precipitate in addition to struvite, which is most likely Mg3 (PO4)2XH2 O.

  • 关键词:Ammonia recovery; Struvite; Magnesium ammonium phosphate; Chemical equilibrium model; Solubility product
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