Experimental assessment and modelling of the proton production linked to phosphorus release and uptake in EBPR systems

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    Abstract

    The modelling of the enhanced biological phosphorus removal (EBPR) process is a recent focus of interest. The pH profile is a promising output variable for EBPR modelling as it is very sensitive to the consumption or production of acid and base species (e.g. phosphate or VFA). pH-based EBPR modelling is based on the assumption that phosphorus is released and taken up as H2PO4-, but this assumption has not been experimentally confirmed yet with enriched EBPR biomass. Therefore, the objective of this work was to assess the species in which P is released and taken up under different pH conditions. Several batch experiments were performed with an enriched culture of Accumulibacter (around 70 ± 10% of total microorganisms). The total observed proton production, inorganic carbon, ammonium, phosphate and VFA were measured to evaluate the titrimetric contribution of anaerobic P-release and aerobic P-uptake over the total observed proton production. The results show that the only phosphorus form involved in P-release and P-uptake is equivalent in terms of proton production to H2PO4- in the pH range of 6.5-8.5. Finally, proton production and pH in several SBR cycles were modelled and resulted in good agreement with the experimental profiles. © 2009 Elsevier Ltd. All rights reserved.
    Original languageEnglish
    Pages (from-to)2431-2440
    JournalWater Research
    Volume43
    Issue number9
    DOIs
    Publication statusPublished - 1 May 2009

    Keywords

    • EBPR
    • Modelling
    • PAO
    • pH
    • Proton production
    • Titrimetry

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