APENDIX A. STOICHIOMETRIC MATRIX OF THE MODEL

Table A1. Stoichiometric matrix of the ASM1 modified model (Lopez de Armentia et al. [16])

Transformations / SI
(mgCOD/L) / SO
(mgO/L) / SS
(mgCOD/L) / SNH
(mgN/L) / SNO2
(mgN/L) / SNO3
(mgN/L) / XNH
(mgCOD/L) / XNO
(mgCOD/L) / XH
(mgCOD/L) / XS
(mgCOD/L) / XI
(mgCOD/L)
Ammonium oxidisers growth / 0 / / 0 / / / 0 / 1 / 0 / 0 / 0 / 0
Nitrite oxidisers growth / 0 / / 0 / / / / 0 / 1 / 0 / 0 / 0
Aerobic growth of heterotrophs on SS / 0 / / / / 0 / 0 / 0 / 0 / 1 / 0 / 0
Aerobic growth of heterotrophs on XS / 0 / / 0 / / 0 / 0 / 0 / 0 / 1 / / 0
Nitrite reduction on SS / 0 / 0 / / / / 0 / 0 / 0 / 1 / 0 / 0
Nitrate reduction on SS / 0 / 0 / / / 0 / / 0 / 0 / 1 / 0 / 0
Nitrite reduction on XS / 0 / 0 / 0 / / / 0 / 0 / 0 / 1 / / 0
Nitrate reduction on XS / 0 / 0 / 0 / / 0 / / 0 / 0 / 1 / / 0
Heterotrophic biomass lysis / 0 / 0 / 0 / / 0 / 0 / 0 / 0 / -1 / 1-fi / fi
Ammonium oxidiser lysis / 0 / 0 / 0 / / 0 / 0 / -1 / 0 / 0 / 1-fi / fi
Nitrite oxidiser lysis / 0 / 0 / 0 / / 0 / 0 / 0 / -1 / 0 / 1-fi / fi

Table A2. Stoichiometric parameters of the model.

Parameters / Definition / Default values used from
ASM2 [13] / Units
iN_SI / Nitrogen content of soluble inert organic matter (SI) / 0.01 / mg N/mg COD
iN_SS / Nitrogen content of readily biodegradable substrate (SS) / 0.03 / mg N/mg COD
iN_XS / Nitrogen content of slowly biodegradable substrate (XS) / 0.04 / mg N/mg COD
iN_XI / Nitrogen content of particulate inert organic matter (XI) / 0.03 / mg N/mg COD
iN_BM / Nitrogen content of biomass (XH, XNH, XNO) / 0.07 / mg N/mg COD
fi / Inert fraction produced in biomass lysis / 0.1 / mg COD/mg COD