Article | Proceedings of The 60th SIMS Conference on Simulation and Modelling SIMS 2019, August 12-16, Västerås, Sweden | Chemical equilibrium model to investigate scaling in moving bed biofilm reactors (MBBR) Linköping University Electronic Press Conference Proceedings
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Title:
Chemical equilibrium model to investigate scaling in moving bed biofilm reactors (MBBR)
Author:
Vasan Sivalingam: Department of Process, Energy and Environmental Technology, University of South-Eastern Norway, Norway Osama Ibrahim: Department of Process, Energy and Environmental Technology, University of South-Eastern Norway, Norway Sergey Kukankov: Department of Process, Energy and Environmental Technology, University of South-Eastern Norway, Norway Babafemi Omodara: Department of Process, Energy and Environmental Technology, University of South-Eastern Norway, Norway Eshetu Janka: Department of Process, Energy and Environmental Technology, University of South-Eastern Norway, Norway Shuai Wang: Biowater Technology AS, Norway Carlos Dinamarca: Department of Process, Energy and Environmental Technology, University of South-Eastern Norway, Norway Hildegunn Haugen: Department of Process, Energy and Environmental Technology, University of South-Eastern Norway, Norway Rune Bakke: Department of Process, Energy and Environmental Technology, University of South-Eastern Norway, Norway
DOI:
https://doi.org/10.3384/ecp20170139
Download:
Full text (pdf)
Year:
2019
Conference:
Proceedings of The 60th SIMS Conference on Simulation and Modelling SIMS 2019, August 12-16, Västerås, Sweden
Issue:
170
Article no.:
021
Pages:
139-144
No. of pages:
6
Publication type:
Abstract and Fulltext
Published:
2020-01-24
ISBN:
978-91-7929-897-5
Series:
Linköping Electronic Conference Proceedings
ISSN (print):
1650-3686
ISSN (online):
1650-3740
Publisher:
Linköping University Electronic Press, Linköpings universitet


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Moving bed biofilm reactor (MBBR) is a robust, flexible and compact technology for treatment of medium to high strength wastewater. However, while treating with high concentration of ammonium, phosphorus and metal ions, the biofilm carriers can sink to the bottom of reactors. That leads to less carrier motion, higher energy consumption and deteriorated mass transfer, causing lower process efficiency and increased operational cost. This can be a major operational challenge for certain types of wastewater. In this study, scaling on biofilm carriers in an MBBR reactor treating reject water from anaerobically digested wastewater sludge was investigated. The metal ion concentrations in the reject wastewater were analyzed using microwave plasma-atomic emission spectroscopy (MP-AES). The chemical equilibrium tool Visual MINTEQ was applied to determine the possible mineral precipitates from the measured concentrations and alkalinity. Dry biomass and precipitates from biofilm carriers were digested by a DigiPREP digestion system and element analysis performed using MP-AES for validation. The results show that Fe3+ and Ca2+ had the highest potential to form mineral precipitates and scaling on the biofilm carriers. Hematite, Maghemite, Hydroxyapatite, Geothite and Magnesioferrite were the first predominant forms of precipitates. The saturation indices (SI) of these minerals increased with pH, implying that measures to lower pH may reduce the problem. Digested biomass composition and inorganic solid analysis confirmed that calcium is the major cause for scale formation. Crystal formations in the biofilms were confirmed by optical microscopy images.

Keywords: Visual MINTEQ, scaling, moving bed biofilm reactor, reject water

Proceedings of The 60th SIMS Conference on Simulation and Modelling SIMS 2019, August 12-16, Västerås, Sweden

Author:
Vasan Sivalingam, Osama Ibrahim, Sergey Kukankov, Babafemi Omodara, Eshetu Janka, Shuai Wang, Carlos Dinamarca, Hildegunn Haugen, Rune Bakke
Title:
Chemical equilibrium model to investigate scaling in moving bed biofilm reactors (MBBR)
DOI:
10.3384/ecp20170139
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Proceedings of The 60th SIMS Conference on Simulation and Modelling SIMS 2019, August 12-16, Västerås, Sweden

Author:
Vasan Sivalingam, Osama Ibrahim, Sergey Kukankov, Babafemi Omodara, Eshetu Janka, Shuai Wang, Carlos Dinamarca, Hildegunn Haugen, Rune Bakke
Title:
Chemical equilibrium model to investigate scaling in moving bed biofilm reactors (MBBR)
DOI:
https://doi.org10.3384/ecp20170139
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