OPEN SOURCE DYNAMIC SIMULATION MODEL FOR MEMBRANE BIOREACTOR (MBR) — RECENT ADVANCES IN DEVELOPMENT AND APPLICATION USING AQUIFAS-MBR MODEL

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Abstract:

Research was undertaken to develop an open source model that can be applied to activated sludge systems operated as Membrane Bioreactors (MBRs). The model has been developed to operate with up to 12 cells (reactors) in series. The values of the kinetic parameters for the model were developed from pilot scale activated sludge systems. The process configuration can be any combination of anaerobic, anoxic, aerobic, post anoxic with or without supplemental carbon, and reaeration or membrane cell; it can also include any combination of step feed; the recycles include mixed liquor, RAS, nitrate and membrane bioreactor recycles. The model was verified at full scale MBR facilities where it was used to simulate several process optimization routines.

The Aquifas MBR model can be operated in steady state and dynamic simulation modes. The dynamic simulation includes the following computations: (1) 24 hour flow weighted average based on hourly simulation during which flows and concentrations vary hourly; (2) monthly average based on daily simulation during which temperatures, MLSS MCRTs, reactor volume, operating DO levels and recycles vary daily over a 31 day period; and (3) annual average where the parameters can vary from month to month over a two year period. The model includes equations to size the MBR cell (footprint and volume), both for normal flow and wet weather flows, and for hollow fiber and flat sheet membranes. The user is able to conduct analysis with one or more membrane cells out of service. The equations for the aeration system allow the user to evaluate various DO levels in the aerobic zone and various air scour on-time fractions in the membrane cell. This helps the user apply the model to optimize the MBR process for treatment and minimize the energy requirements.

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/193864708788804784

Publication date: January 1, 2008

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  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

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