Working Paper Article Version 1 This version is not peer-reviewed

Appraisal of Super-fast Membrane Bioreactors by MASM – A New Activated Sludge Model for Membrane Filtration

Version 1 : Received: 21 April 2021 / Approved: 26 April 2021 / Online: 26 April 2021 (13:01:21 CEST)

How to cite: Orhon, D.; Yucel, A.B.; Insel, G.; Solmaz, B.; Mermutlu, R.; Sözen, S. Appraisal of Super-fast Membrane Bioreactors by MASM – A New Activated Sludge Model for Membrane Filtration. Preprints 2021, 2021040668 Orhon, D.; Yucel, A.B.; Insel, G.; Solmaz, B.; Mermutlu, R.; Sözen, S. Appraisal of Super-fast Membrane Bioreactors by MASM – A New Activated Sludge Model for Membrane Filtration. Preprints 2021, 2021040668

Abstract

The structure of existing activated models is inherently deficient in reflecting the major role of the membrane filtration. This study developed and proposed a novel model, MASM, for the membrane activated process. The effective filtration size imposed by the membrane module, entrapping larger size particles was adopted as the basis of the proposed model. The model defined a modified COD fractionation, accounting for the captured COD fractions as additional model components and utilizing related mass balance relationships. It was implemented for testing the fate of soluble hydrolysable COD and system performance of super-fast membrane activated sludge based on real data for the characterization and process kinetics of domestic sewage and denim processing effluents. Model evaluation was carried for parallel systems with gravity settling and membrane filtration operated at a sludge age range of 0.5-2.0 d. Results reflected significantly better performance of super-fast membrane activated sludge system for both wastewaters, underlining that it was crucially important to account for the captured COD fractions to provide an accurate evaluation of system behavior and effluent quality. This should also be identified as the major shortcoming of the ASM models for evaluating and predicting system performance of activated sludge configurations with membrane separation.

Subject Areas

MASM; new model for membrane activated sludge system; super-fast membrane activated sludge; particle size distribution; modified COD fractionation; captured COD fractions.

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