Sensitivity analyses and simulations of a full-scale experimental membrane bioreactor system using the activated sludge model No. 3 (ASM3)

Abstract

An ASM3-based model was implemented in the numerical software MATHEMATICA where sensitivity analyses and simulations of a membrane bioreactor (MBR) system were carried out. These results were compared with those obtained using the commercial simulator WEST. Predicted values did not show significant variations between both software and simulations showed that the most influential operational conditions were influent flow rate and concentrations and bioreactor volumes. On the other hand, sensitivity analyses were carried out with both software programs for the same five outputs: COD, ammonium and nitrate concentrations in the effluent, total suspended solids concentration and oxygen uptake rate in the aerobic bioreactor. Similar results were in general obtained in both cases and according to these analyses, the most significant inputs over the model predictions were growth and storage heterotrophic biomass yields and decay coefficient. Other parameters related to the hydrolysis process or to the autotrophic biomass also significantly influenced model outputs.

Keywords:

• ASM3
• MBR
• modeling
• sensitivity analysis
• simulation

Acknowledgments

This research was conducted at the Department of Civil Engineering, the Department of Building Engineering and the Institute of Water Research, University of Granada, with the collaboration of EMASAGRA.

Funding

This research (NET 324936/1) was funded by the Andalusian Government (Andalusian Water Agency) with European Union funds (FEDER).