title: The polyhydroxyalkanoates characteristics of denitrifying and non-denitrifying phosphate accumulating organisms.
abstract: This study investigated the polyhydroxyalkanoates (PHA) characteristics of denitrifying phosphate accumulating organisms (DNPAO) and non-denitrifying phosphate accumulating organisms (non-DNPAO) via a series of anoxic batch experiments in which the sludge was taken from a hybrid AS-biofilm pilot plant named the TNCU-I process. The results showed that 40.7% and 59.3% of the PHA was utilized in the anoxic and aerobic zones, respectively. Meanwhile, 47% and 53% of the phosphate was taken up in the anoxic and aerobic zones. The phosphate uptake amount per unit of PHA consumption (YPO4/PHA) in the anoxic and aerobic zones of the TNCU-I pilot plant were 0.83 mg PO4-P/mg PHA and 0.64 mg PO4-P/mg PHA. Furthermore, the batch experiments showed that the gammaPO4 PHA of DNPAO and non-DNPAO was 1.12 and 1.22 mg PO4-P/mg PHA, respectively. The difference of gammaPO4/PHA for non-DNPAO between the pilot plant and batch experiments may be caused by insufficient phosphate and the extra PHA consumption in the aerobic zone.
authors.affiliation: Graduated Institute of Environmental Engineering, National Central University, Chungli, Taiwan.
authors.forename: S J
authors.initials: SJ
authors.lastname: You
authors.forename: C F
authors.initials: CF
authors.lastname: Ouyang
authors.forename: S H
authors.initials: SH
authors.lastname: Chuang
mesh_terms: D000332:Aerobiosis; D000693:Anaerobiosis; D001419:Bacteria / Q000378:metabolism*; D001704:Biopolymers / Q000737:chemistry*; D019149:Bioreactors; D009566:Nitrates / Q000032:analysis*; D010710:Phosphates / Q000302:isolation & purification*; D012722:Sewage; D013624:Taiwan; D014865:Waste Disposal, Fluid / Q000379:methods*
chemical_list: D001704:Biopolymers; D009566:Nitrates; D010710:Phosphates; D012722:Sewage