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A Simplified Model of an Activated Sludge Process with a Plug-Flow Reactor
Mälardalen University, School of Business, Society and Engineering, Future Energy Center.ORCID iD: 0000-0002-8034-4043
Uppsala University, Sweden. (Division of Systems and Control, Department of Information Technology)
Lund University, Sweden. (Centre for Mathematical Sciences)
Mälardalen University, School of Business, Society and Engineering, Future Energy Center.ORCID iD: 0000-0003-3311-9465
2016 (English)Conference paper, Abstract (Refereed)
Abstract [en]

The analysis of a simplified activated sludge process (ASP) with one main dissolved substrate and one main particulate biomass component has been conducted with respect to its steady-state. The ASP is formed by a plug flow reactor (PFR) and a settler with the recycling going to the reactor. The biomass growth rate is described by a Monod function. For this process, it is not possible to get an explicit expression for the effluent substrate concentration when the process is subject to a fixed sludge age. However,in the normal case when the influent substrate concentration is much greater than the effluent substrate concentration, then an explicit approximation for the effluent as a function of the influent and the process parameters is obtained. This work includes numerical examples considering two models for the settler. One model is the ideal settler, which assumes a complete thickening of the activated sludge through the underflow of the settler. The other model takes into account hindered settling and sludge compression. Numerical results show the effectiveness and the limitations of the proposed solution under these scenarios.

Place, publisher, year, edition, pages
2016.
Keyword [en]
bioreactor, clarifier, sludge blanket, sludge age
National Category
Water Engineering
Research subject
Energy- and Environmental Engineering
Identifiers
URN: urn:nbn:se:mdh:diva-32946OAI: oai:DiVA.org:mdh-32946DiVA: diva2:956097
Conference
9th Eurosim Congress on Modelling and Simulation, 12-16 September 2016, Oulu Finland
Funder
Knowledge Foundation, 20140168
Available from: 2016-08-29 Created: 2016-08-29 Last updated: 2016-12-09Bibliographically approved

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