Symbol	Meaning	Units
EBPR	enhanced biological phosphorus removal
AS	activated sludge
ASM	activated sludge model
SRC	standard regression coefficients
OLS	ordinary least squares
LASSO	least absolute shrinkage and selection operator
RBD-FAST	Fourier amplitude sensitivity test via random balanced designs
GSA	global sensitivity analysis
PHA	poly-β-hydroxy-alkanoate
PHB	poly-β-hydroxy-butyrate
PHV	poly-β-hydroxy-valerate
PH2MV	poly-β-hydroxy-methyvalerate
PAO	phosphorus accumulating organism
GAO	glycogen accumulating organism
poly-P	poly-phosphate
VFA	volatile fatty acids
HAc	acetate
HPr	propionate
SRT	solids retention time
HRT	hydraulic retention time
T	temperature	°C
Xj	intra-cellular concentration of component j	C-mol/l
Xj, i	initial intra-cellular concentration of component j	P or C-mol/l
fj	intra-cellular fraction of component j per unit of biomass	P or C-mol/C-mol
fji	initial intra-cellular fraction of component j per unit of biomass	P or C-mol/C-mol
fj, max	maximum intra-cellular fraction of component j per unit of biomass	P or C-mol/C-mol
Sj	concentration of j in the bulk liquid phase	P or C-mol/l
SVFA, i	initial concentration of j in the bulk liquid phase	C-mol/l
rP/C, i	ratio of the PO4 to VFA concentration in the influent
rHAc/HPr, i	ratio of acetate to propionate in the influent VFA
qj	maximum rate of conversion of component j	P or C-mol/C-molh−1
mATP, an	anaerobic maintenance coefficient	P-mol/C-molh−1
mATP, ox	aerobic maintenance coefficient	ATP-mol/C-molh−1
Kj	half-saturation constant of component j	C-mol/l
θj	Arrhenius temperature coefficient of component j
δ	yield of ATP per unit of NADH oxidized (P/O ratio)	ATP-mol/NADH-mol
ε	aerobic PO4 transport coefficient	P-mol/NADH-mol
K1	ATP required for biomass synthesis from Acetyl-CoA*	ATP-mol/C-mol
K2	ATP required for biomass synthesis from Propionyl-CoA*	ATP-mol/C-mol