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A summary of the nitrifying and denitrifying conditions used for the model can be found in Tables 1 and 2, respectively. A complete list of stoichiometric matrices, reaction rates and other model parameters for both models can be found in the Supporting Information (Tables S1–S6).

Table 2

Parameters used for the denitrification model

ParameterSymbolValueUnitsSource
Concentrations in influent 
 Methanol (as COD) C0,COD 720 (non-limiting) mg L−1 Chosen 
 Nitrate C0,NO3 Range 0.0001–50 mg L−1 Varied 
 Nitrite C0,NO2 mgN L−1 Chosen 
 Nitric oxide C0,NO mgN L−1 Chosen 
 Nitrous oxide C0,N2O mgN L−1 Chosen 
 Oxygen C0,O2 Range 0.00001–4 mgO2 L−1 Varied 
Biomass concentration in the biofilm 
 Concentration total redox mediators CT,Med 0.01 mol kg−1 Pan et al. (2013)  
 Biofilm thickness LF 400 (base case) 5, 50, 400 (varied) μm Typical values 
 Liquid flow rate Q 44 mL min−1 Chosen 
 Liquid volume in the reactor Vb Chosen 
 Biofilm surface area AF 0.5 m2 Chosen 
 Gas volume VG 3.5 Chosen 
 Gas flow rate QG L min−1 Chosen 
 Gas-liquid mass transfer coeff. kLa 100 h−1 Chosen 
 Henry gas-liquid coefficient N2O (25 °C) HN2O 0.611 mol mol−1 CRC Handbook (2014)  
ParameterSymbolValueUnitsSource
Concentrations in influent 
 Methanol (as COD) C0,COD 720 (non-limiting) mg L−1 Chosen 
 Nitrate C0,NO3 Range 0.0001–50 mg L−1 Varied 
 Nitrite C0,NO2 mgN L−1 Chosen 
 Nitric oxide C0,NO mgN L−1 Chosen 
 Nitrous oxide C0,N2O mgN L−1 Chosen 
 Oxygen C0,O2 Range 0.00001–4 mgO2 L−1 Varied 
Biomass concentration in the biofilm 
 Concentration total redox mediators CT,Med 0.01 mol kg−1 Pan et al. (2013)  
 Biofilm thickness LF 400 (base case) 5, 50, 400 (varied) μm Typical values 
 Liquid flow rate Q 44 mL min−1 Chosen 
 Liquid volume in the reactor Vb Chosen 
 Biofilm surface area AF 0.5 m2 Chosen 
 Gas volume VG 3.5 Chosen 
 Gas flow rate QG L min−1 Chosen 
 Gas-liquid mass transfer coeff. kLa 100 h−1 Chosen 
 Henry gas-liquid coefficient N2O (25 °C) HN2O 0.611 mol mol−1 CRC Handbook (2014)  

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