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Table 2

Definition of components in the models

ComponentDefinitionUnit
Dissolved components 
 SBAPa Biomass associated products g COD m−3 
 SUAPa Utilization-associated products g COD m−3 
 SS or SCOD Readily degradable organic substrate g COD m−3 
 SNH4 Ammonium nitrogen g N m−3 
 SNO2 Nitrite nitrogen g N m−3 
 SNO3 Nitrate nitrogen g N m−3 
 SN2 Dissolved nitrogen gas g N m−3 
Model particulate components 
 XAN Anaerobic ammonium-oxidizing bacteria g COD m−3 
 XAOB Ammonium-oxidizing bacteria g COD m−3 
 XNOB Nitrite-oxidizing bacteria g COD m−3 
 XEPSa Extracellular polymeric substances g COD m−3 
 XH Heterotrophic bacteria g COD m−3 
 XS Slowly degradable organic substrate g COD m−3 
 XI Inert, non-biodegradable organics g COD m−3 
 Xothers Other bacteria, not contributing to carbon and nitrogen removal processes g COD m−3 
ComponentDefinitionUnit
Dissolved components 
 SBAPa Biomass associated products g COD m−3 
 SUAPa Utilization-associated products g COD m−3 
 SS or SCOD Readily degradable organic substrate g COD m−3 
 SNH4 Ammonium nitrogen g N m−3 
 SNO2 Nitrite nitrogen g N m−3 
 SNO3 Nitrate nitrogen g N m−3 
 SN2 Dissolved nitrogen gas g N m−3 
Model particulate components 
 XAN Anaerobic ammonium-oxidizing bacteria g COD m−3 
 XAOB Ammonium-oxidizing bacteria g COD m−3 
 XNOB Nitrite-oxidizing bacteria g COD m−3 
 XEPSa Extracellular polymeric substances g COD m−3 
 XH Heterotrophic bacteria g COD m−3 
 XS Slowly degradable organic substrate g COD m−3 
 XI Inert, non-biodegradable organics g COD m−3 
 Xothers Other bacteria, not contributing to carbon and nitrogen removal processes g COD m−3 

aComponents were only available in the model with EPS.

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