uu.seUppsala University Publications
Change search

Cite
Citation style
• apa
• ieee
• modern-language-association
• vancouver
• Other style
More styles
Language
• de-DE
• en-GB
• en-US
• fi-FI
• nn-NO
• nn-NB
• sv-SE
• Other locale
More languages
Output format
• html
• text
• asciidoc
• rtf
Steady-state analysis of activated sludge processes with a settler model including sludge compression
Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Division of Systems and Control. Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Automatic control.
Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Division of Systems and Control. Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Automatic control.
2016 (English)In: Water Research, ISSN 0043-1354, E-ISSN 1879-2448, Vol. 88, p. 104-116Article in journal (Refereed) Published
Abstract [en]

A reduced model of a completely stirred-tank bioreactor coupled to a settling tank with recycle is analyzed in its steady states. In the reactor, the concentrations of one dominant particulate biomass and one soluble substrate component are modelled. While the biomass decay rate is assumed to be constant, growth kinetics can depend on both substrate and biomass concentrations, and optionally model substrate inhibition. Compressive and hindered settling phenomena are included using the Bürger-Diehl settler model, which consists of a partial differential equation. Steady-state solutions of this partial differential equation are obtained from an ordinary differential equation, making steady-state analysis of the entire plant difficult. A key result showing that the ordinary differential equation can be replaced with an approximate algebraic equation simplifies model analysis. This algebraic equation takes the location of the sludge-blanket during normal operation into account, allowing for the limiting flux capacity caused by compressive settling to easily be included in the steady-state mass balance equations for the entire plant system. This novel approach grants the possibility of more realistic solutions than other previously published reduced models, comprised of yet simpler settler assumptions. The steady-state concentrations, solids residence time, and the wastage flow ratio are functions of the recycle ratio. Solutions are shown for various growth kinetics; with different values of biomass decay rate, influent volumetric flow, and substrate concentration.

Place, publisher, year, edition, pages
2016. Vol. 88, p. 104-116
Keywords [en]
Bioreactor; Burger-Diehl settler model; Growth kinetics; Limiting flux; Secondary settling tank; Solids residence time (SAT)
National Category
Control Engineering Water Treatment
Identifiers
ISI: 000367276500010OAI: oai:DiVA.org:uu-266264DiVA, id: diva2:867626
Funder
ÅForsk (Ångpanneföreningen's Foundation for Research and Development)Available from: 2015-10-09 Created: 2015-11-05 Last updated: 2017-12-01Bibliographically approved

Open Access in DiVA

No full text in DiVA

Publisher's full text

Authority records BETA

Zambrano, JesúsCarlsson, Bengt

Search in DiVA

By author/editor
Zambrano, JesúsCarlsson, Bengt
By organisation
Division of Systems and ControlAutomatic control
Water Research
On the subject
Control EngineeringWater Treatment

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 685 hits

Cite
Citation style
• apa
• ieee
• modern-language-association
• vancouver
• Other style
More styles
Language
• de-DE
• en-GB
• en-US
• fi-FI
• nn-NO
• nn-NB
• sv-SE
• Other locale
More languages
Output format
• html
• text
• asciidoc
• rtf