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A model to describe the performance of the UASB reactor
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology. KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Land and Water Resources Engineering.
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Land and Water Resources Engineering.
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology.ORCID iD: 0000-0001-8241-2225
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology.ORCID iD: 0000-0001-6801-9208
2014 (English)In: Biodegradation, ISSN 0923-9820, E-ISSN 1572-9729, Vol. 25, no 2, 239-251 p.Article in journal (Refereed) Published
Abstract [en]

A dynamic model to describe the performance of the Upflow Anaerobic Sludge Blanket (UASB) reactor was developed. It includes dispersion, advection, and reaction terms, as well as the resistances through which the substrate passes before its biotransformation. The UASB reactor is viewed as several continuous stirred tank reactors connected in series. The good agreement between experimental and simulated results shows that the model is able to predict the performance of the UASB reactor (i.e. substrate concentration, biomass concentration, granule size, and height of the sludge bed).

Place, publisher, year, edition, pages
2014. Vol. 25, no 2, 239-251 p.
Keyword [en]
CSTR, Kinetic, Model, UASB, Wastewater
National Category
Microbiology
Identifiers
URN: urn:nbn:se:kth:diva-144112DOI: 10.1007/s10532-013-9656-zISI: 000332797600007Scopus ID: 2-s2.0-84895786597OAI: oai:DiVA.org:kth-144112DiVA: diva2:712122
Note

QC 20140414

Available from: 2014-04-14 Created: 2014-04-10 Last updated: 2017-12-05Bibliographically approved
In thesis
1. Closing the Loop by Combining UASB Reactor and Reactive Bed Filetr Technology for wastewater Treatment: Modelling and Practical Approaches
Open this publication in new window or tab >>Closing the Loop by Combining UASB Reactor and Reactive Bed Filetr Technology for wastewater Treatment: Modelling and Practical Approaches
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

A laboratory-scale upflow anaerobic sludge blanket (UASB) reactor followed by a packed bed reactor (PBR) filled with Sorbulite® in the lower part and Polonite® in the upper part was used to treat household wastewater in a 50-week experiment. A model was developed to describe the performance of the UASB reactor, including mass transfer through the film around anaerobic granules, intra-particle diffusion and bioconversion of the substrate. In a second model, a numerical expression describing the kinetics occurring in the granules was developed. It includes the resistances through which the substrate passes before biotransformation. These expressions were then linked to governing equations for the UASB reactor in order to describe degradation of the substrate, biomass growth (active and inactive), and variation in granule size over time. A third model was developed to describe the profile of the phosphorus (P) concentration throughout the PBR. In a first attempt, the analytical and numerical model was applied to data taken from previous studies in which UASB reactors were used to treat sugarcane mill wastewater and slaughterhouse wastewater. The results showed good agreement between observed and simulated results. Sensitivity analysis showed that diffusion coefficient and yield were important parameters in the UASB reactor model.The laboratory bench-scale experiment revealed that the combined UASB-PBR system efficiently treated the residential wastewater. Phosphorus, BOD7 and pathogenic bacteria all showed average removal of 99%, while total nitrogen showed a moderate reduction in the system (40%). Application of the numerical solution model to the experimental UASB reactor used resulted in good agreement between simulated and experimental values. Regarding the PBR, the model developed successfully predicted P removal. For both models, the capability and sensitivity analyses identified important parameters. A treatment system aiming to close the loop is suggested based on sequential UASB and PBR with biogas collection, nutrient recycling via sludge and filter media and elimination of pathogenic organisms.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2016. xvi, 50 p.
Series
TRITA-LWR. PHD, ISSN 1650-8602 ; 2016:02
Keyword
Bench-scale experiment, Modelling, Polonite, Sorbulite, UASB, Wastewater
National Category
Environmental Engineering
Research subject
Land and Water Resources Engineering
Identifiers
urn:nbn:se:kth:diva-182990 (URN)978-91-7595-878-1 (ISBN)
Public defence
2016-03-18, Sal V1, Teknikringen 76, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20160226

Available from: 2016-02-26 Created: 2016-02-24 Last updated: 2016-02-26Bibliographically approved

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Moreno, Luis

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