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Re-visiting the Phostrip process to recover phosphorus from municipal wastewater

Salehi, Sara ; Cheng, Ka Yu ; Heitz, Anna ; Ginige, Maneesha P.

Chemical engineering journal (Lausanne, Switzerland : 1996), 2018-07, Vol.343, p.390-398 [Periódico revisado por pares]

Elsevier B.V

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  • Título:
    Re-visiting the Phostrip process to recover phosphorus from municipal wastewater
  • Autor: Salehi, Sara ; Cheng, Ka Yu ; Heitz, Anna ; Ginige, Maneesha P.
  • Assuntos: Modified Michaelis-Menten kinetics ; Municipal wastewater ; Phosphorus recovery ; Phostrip
  • É parte de: Chemical engineering journal (Lausanne, Switzerland : 1996), 2018-07, Vol.343, p.390-398
  • Descrição: •Specific P release rate of RAS declined with increasing concentration of PO43−-P.•A strong positive linear correlation between acetate consumed and P released.•Acetate concentration not a factor for the reduction of specific P release rate.•P release rate halved when PO43−-P concentration in bulk reached ∼83 mg-P/L. This study examined an innovative approach to make use of the Phostrip process to recover phosphorus (P) from municipal wastewater. Returned activated sludge (RAS) from a municipal wastewater treatment plant was systematically studied to examine P release kinetics of RAS in a recovery stream that contained high concentrations of phosphate (PO43−-P). Findings suggested that the specific P release rate in RAS declined with increasing concentration of PO43−-P in the recovery stream. However, there was a strong positive linear correlation between acetate consumed and P released by the RAS (Pearson product-moment correlation coefficient [r = 0.98, n = 45, p < 0.005]). The data also suggest that acetate concentration in the recovery stream was not a factor in the observed reduction of specific P release rate with increasing PO43−-P in the recovery stream. When P release rates (poly-P hydrolysis rate) at different initial P concentrations were modelled using a modified Michaelis-Menten equation, a good fit was achieved between the experimental and the modelled data. According to the model, the maximum specific P release rate (18 mg-P/g-MLSS.h) halved when PO43−-P concentration in the recovery stream reached approximately 83 mg-P/L. Additionally, the RAS demonstrated a Prelease/Cacetate uptake molar ratio of approximately 0.5. An application of the derived P release kinetics into an innovative side stream process configuration showed that a Phostrip tank with a small footprint (9 m3) is sufficient to facilitate P recovery from a wastewater treatment plant that receives 61 ML/d of influent.
  • Editor: Elsevier B.V
  • Idioma: Inglês
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