TY - JOUR
T1 - Phosphorus and polyhydroxyalkanoates variation in a combined process with activated sludge and biofilm
AU - Chuang, S. H.
AU - Ouyang, C. F.
AU - Yuang, H. C.
AU - You, S. J.
N1 - Funding Information:
The authors would like to thank the National Science Council of the Republic of China for financially supporting this work under Contract No. NSC 84-2211-E-008-OO3. The Prof. T. Matsuo and W. T. Liu of University of Tokyo are appreciated for their valuable discussions regarding the PHAs analy~is.
PY - 1998
Y1 - 1998
N2 - 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 r(P/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.
AB - 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 r(P/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.
KW - Denitrification
KW - Nutrient removal
KW - PHB
KW - Phosphorus uptake
KW - PHV
KW - Polyhydroxyalkanoates (PHAs)
UR - http://www.scopus.com/inward/record.url?scp=0031803443&partnerID=8YFLogxK
U2 - 10.1016/S0273-1223(98)00168-1
DO - 10.1016/S0273-1223(98)00168-1
M3 - 會議論文
AN - SCOPUS:0031803443
SN - 0273-1223
VL - 37
SP - 593
EP - 597
JO - Water Science and Technology
JF - Water Science and Technology
IS - 4-5
T2 - Proceedings of the 1997 2nd International Conference on Microorganisms in Activated Sludge and Biofilm Processes
Y2 - 21 July 1997 through 23 July 1997
ER -