TY - JOUR
T1 - High phosphorus shock loading induced glycogen accumulating organisms in anaerobic/oxic sequencing batch reactor
AU - Hsu, Chih Hsun
AU - Chang, Wei Chin
AU - Chen, Jian Jyun
AU - Wu, Jhong Syun
PY - 2012/9
Y1 - 2012/9
N2 - This study investigated the long-term adaptability of an acetate-fed anaerobic-oxic sequencing batch reactor, operated at 15 days of solid retention time (SRT), to the influent P/COD loading raised from 15/400 to 40/400 mg/mg. Experiment results showed that after four SRTs operation, the anaerobic P release, aerobic P uptake and sludge P content decreased apparently, implying the metabolism of phosphate-accumulating organisms (PAOs) was inhibited. In contrast, anaerobic glycogen consumption and polyhydroxyalkanoates (PHAs) accumulation per acetate uptake increased observably, and 3HV/PHAs ratio elevated gradually to 21.8%. These results indicated that the proliferation of glycogen-accumulating organisms (GAOs) was encouraged. When influent phosphorus was reduced back to 15 mg/L, sludge P content diminished and a low P release/acetate uptake ratio was achieved, suggesting that PAOs' metabolism was not restored. The above findings concluded that long-term operation of the high phosphorus influent inhibited the proliferation of PAOs, and more importantly provided GAOs a competitive advantage over PAOs.
AB - This study investigated the long-term adaptability of an acetate-fed anaerobic-oxic sequencing batch reactor, operated at 15 days of solid retention time (SRT), to the influent P/COD loading raised from 15/400 to 40/400 mg/mg. Experiment results showed that after four SRTs operation, the anaerobic P release, aerobic P uptake and sludge P content decreased apparently, implying the metabolism of phosphate-accumulating organisms (PAOs) was inhibited. In contrast, anaerobic glycogen consumption and polyhydroxyalkanoates (PHAs) accumulation per acetate uptake increased observably, and 3HV/PHAs ratio elevated gradually to 21.8%. These results indicated that the proliferation of glycogen-accumulating organisms (GAOs) was encouraged. When influent phosphorus was reduced back to 15 mg/L, sludge P content diminished and a low P release/acetate uptake ratio was achieved, suggesting that PAOs' metabolism was not restored. The above findings concluded that long-term operation of the high phosphorus influent inhibited the proliferation of PAOs, and more importantly provided GAOs a competitive advantage over PAOs.
KW - Biological treatment
KW - Glycogen-accumulating organisms
KW - High phosphorus loading
KW - Phosphate-accumulating organisms
KW - Phosphorus removal
UR - http://www.scopus.com/inward/record.url?scp=84866439855&partnerID=8YFLogxK
U2 - 10.1080/19443994.2012.696418
DO - 10.1080/19443994.2012.696418
M3 - 文章
AN - SCOPUS:84866439855
SN - 1944-3994
VL - 47
SP - 42
EP - 49
JO - Desalination and Water Treatment
JF - Desalination and Water Treatment
IS - 1-3
ER -