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PBE Modeling of Flocculation of Microalgae: Investigating the Overshoot in Mean Size Profiles
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Energy Processes.ORCID iD: 0000-0002-1881-2686
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Energy Processes.
2017 (English)In: Proceedings of the 9th International Conference on Applied Energy, Elsevier, 2017, Vol. 142, p. 507-512Conference paper, Published paper (Refereed)
Abstract [en]

Microalgae is considered as a viable feedstock to biomass gasification. After synthesis in water medium, microalgae are separated and dried to a suitable degree to be fed to the gasification process. In order to achieve an efficient separation, a flocculation process is employed, in which microalgae primary particles aggregate and form larger clusters. Although flocculation is a well-established process, there are still some unknown issues related to it, that are worth further research. Experiments show that the mean size of clusters during flocculation goes through a maximum and then decreases with time. We refer to this pattern in the mean size profile as the overshoot. Studying this phenomenon is crucial since the size of clusters has a significant effect on the overall efficiency of the separation of microalgae from water. In this work, we aim at investigating the mechanisms behind the overshoot. The flocculation process is modeled as an aggregation-breakup system by using population balance equations (PBEs). The primary results show that the aggregation and breakup alone cannot lead to the overshoot in the mean size profile. Thus, we suggested three mechanisms that can lead to the overshoot: deposition of large clusters (DLC), restructuring of clusters (RC), and primary particle aggregation (PPA). These mechanisms were examined with numerical simulations and it was revealed that all three lead to the overshoot.

Place, publisher, year, edition, pages
Elsevier, 2017. Vol. 142, p. 507-512
Series
Energy Procedia, ISSN 1876-6102 ; 142
Keywords [en]
aggregation, breakup, depostion of clusters, Microlagae flocculation, PBE, primary particle aggreagtion, resutructuring of clusters
National Category
Chemical Process Engineering
Identifiers
URN: urn:nbn:se:kth:diva-224400DOI: 10.1016/j.egypro.2017.12.079Scopus ID: 2-s2.0-85041538183OAI: oai:DiVA.org:kth-224400DiVA, id: diva2:1191485
Conference
9th International Conference on Applied Energy, ICAE 2017, Cardiff, United Kingdom, 21 August 2017 through 24 August 2017
Funder
Swedish Research CouncilSwedish Energy Agency
Note

QC 20180319

Available from: 2018-03-19 Created: 2018-03-19 Last updated: 2018-03-19Bibliographically approved

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Sadegh-Vaziri, Ramiar

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