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The Role of Poly-Hydroxy-Alkanoate Form in Determining the Response of Enhanced Biological Phosphorus Removal Biomass to Volatile Fatty Acids

Yan-Hua Liu, Cherie Geiger and Andrew Amis Randall
Water Environment Research
Vol. 74, No. 1 (Jan. - Feb., 2002), pp. 57-67
Stable URL: http://www.jstor.org/stable/25045572
Page Count: 11
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
The Role of Poly-Hydroxy-Alkanoate Form in Determining the Response of Enhanced Biological Phosphorus Removal Biomass to Volatile Fatty Acids
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Abstract

Anaerobic-aerobic batch experiments indicated that poly-hydroxy-alkanoate (PHA) form was important in determining the net phosphorus removal resulting from different volatile fatty acids (VFAs). Poly-3-hydroxy-butyrate (3HB) content was found to correlate fairly well with higher observed aerobic phosphorus uptake per unit PHA carbon degraded. Poly-3-hydroxy-valerate (3HV) correlated with lower aerobic phosphorus uptakes per unit PHA carbon degraded. These experiments, conducted with synthetic wastewater, imply that VFA speciation might have a significant effect on aerobic phosphorus uptakes and net phosphorus removal. In addition, the model parameter $f_{{\rm P},{\rm UPT}}$ (Barker and Dold, 1997) could vary with the proportion of acetic to propionic acid received (i.e., the acetic/propionic acid ratio may be an important parameter for these systems). Carbohydrate data implied that the lower aerobic phosphorus uptake resulting from 3HV might have been caused by a greater fraction of PHA carbon shunting to carbohydrate biosynthesis during aerobiosis.

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