Journal
WATER RESEARCH
Volume 43, Issue 9, Pages 2431-2440Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2009.03.003
Keywords
EBPR; Modelling; pH; PAO; Proton production; Titrimetry
Funding
- Ministerio of Ciencia y Tecnologia (CICYT) [CTM2004-02569/TECNO, CTQ2007-61756/PPQ]
- Spanish government [FPU AP 2004-7085]
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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. (C) 2009 Elsevier Ltd. All rights reserved.
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