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

•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 r...

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Bibliographic Details
Published in:Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2018-07, Vol.343, p.390-398
Main Authors: Salehi, Sara, Cheng, Ka Yu, Heitz, Anna, Ginige, Maneesha P.
Format: Article
Language:English
Subjects:
Modified Michaelis-Menten kinetics
Municipal wastewater
Phosphorus recovery
Phostrip
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Summary:•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 
ISSN:1385-8947
1873-3212
DOI:10.1016/j.cej.2018.02.074