title: Modelling High-temperature EBPR by Incorporating Glycogen and GAOs: Challenges from a Preliminary Study.
abstract: Recently reported kinetic and stoichiometric parameters of the Activated Sludge Model no. 2d (ASM2d) for high-temperature EBPR processes suggested that the absence of glycogen in the model contributed to underestimation of PHA accumulation at 32 °C. Here, two modified ASM2d models were used to further explore the contribution of glycogen in the process. The ASM2d-1G model incorporated glycogen metabolism by PAOs (polyphosphate-accumulating organisms), while the ASM2d-2G model further included processes by GAOs (glycogen-accumulating organisms). These models were calibrated and validated using experimental data at 32 °C. The ASM2d-1G model supported the hypothesis that the excess PHA was attributed to glycogen, but remained inadequate to capture the dynamics of glycogen without considering GAOs activities. The ASM2d-2G model performed better, but it was challenging to calibrate as it often led to wash-out of either PAOs or GAOs. Associated hurdles are highlighted and additional efforts in calibrating ASM2d-2G more effectively are proposed.
authors.forename: Kee Fui
authors.initials: KF
authors.lastname: Liau
authors.forename: Hak Koon
authors.initials: HK
authors.lastname: Yeoh
authors.forename: Tadashi
authors.initials: T
authors.lastname: Shoji
authors.forename: Adeline Seak May
authors.initials: AS
authors.lastname: Chua
authors.forename: Pei Yee
authors.initials: PY
authors.lastname: Ho
mesh_terms: D006003:Glycogen / Q000378:metabolism*; D006358:Hot Temperature; D007700:Kinetics; D008962:Models, Theoretical; D010758:Phosphorus / Q000378:metabolism*; D011122:Polyphosphates / Q000378:metabolism*; D012722:Sewage / Q000032:analysis
chemical_list: D011122:Polyphosphates; D012722:Sewage; D010758:Phosphorus; D006003:Glycogen