This study investigates variations of phosphorus and polyhydroxyalkanoates (PHAs) in a combined activated sludge - biofilm process, operating under various sludge retention times (5, 10 and 15 days) and different dissolved oxygen conditions (0.1, 0.5, 1.0 and 2.0 mg/l in aerobic stage). Experimental results indicate that phosphorus uptake closely corresponds to utilization of PHAs during anoxic and aerobic stages. Moreover, the sludge in the anoxic stage exhibits a higher PHAs utilization efficiency with respect to phosphorus uptake than sludge in the aerobic stage, when it is under low COD-SS loading conditions. The values of rP/PHAs, representing sludge capacity on phosphorus uptake, range from 0.1-1.0 mg P/mg PHAs. In addition, analyzing the distribution of 3-hydroxybutyrate (3HB), 3-hydroxy-2-methylbutyrate (3H2MB), 3-hydroxyvalerate (3HV) and 3-hydroxy-2-methylvalerate (3H2MV) reveals that 3HB and 3HV are the major components of PHAs. The values of 3HB/PHAs and 3HV/PHAs vary with COD-SS loading of the process. When F/M ratio increases, 3HV/PHAs value increases and 3HB/PHAs value decreases simultaneously. This phenomenon implies that more bacteria accumulated 3HV as storage matter under high COD-SS loading conditions. The kind of bacteria population shift would intensify the competition of “G bacteria” with polyphosphate accumulating organisms, possibly causing process deterioration during phosphorus removal.
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Research Article|
February 01 1998
Phosphorus and polyhydroxyalkanoates variation in a combined process with activated sludge and biofilm
S. H. Chuang;
S. H. Chuang
*Graduate Institute of Environmental Engineering, National Central University, Chungli 320, Taiwan
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C. F. Ouyang;
C. F. Ouyang
*Graduate Institute of Environmental Engineering, National Central University, Chungli 320, Taiwan
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H. C. Yuang;
H. C. Yuang
**Sewerage Engineering Department, Public Work Bureau, Municipal Government of Taipei, Taiwan
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S. J. You
S. J. You
*Graduate Institute of Environmental Engineering, National Central University, Chungli 320, Taiwan
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Water Sci Technol (1998) 37 (4-5): 593–597.
Citation
S. H. Chuang, C. F. Ouyang, H. C. Yuang, S. J. You; Phosphorus and polyhydroxyalkanoates variation in a combined process with activated sludge and biofilm. Water Sci Technol 1 February 1998; 37 (4-5): 593–597. doi: https://doi.org/10.2166/wst.1998.0724
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