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Particulate substrate retention in plug-flow and fully-mixed conditions during operation of aerobic granular sludge systems

Layer, M.; Bock, K.; Ranzinger, F.; Horn, H.; Morgenroth, E.; Derlon, N.

Abstract:
Particulate substrate (X$_{B}$) is the major organic substrate fraction in most municipal wastewaters. However, the impact of X$_{B}$ on aerobic granular sludge (AGS) systems is not fully understood. This study evaluated the physical retention of X$_{B}$ in AGS sequencing batch reactor (SBR) during anaerobic plug-flow and then aerobic fully-mixed conditions. The influence of different sludge types and operational variables on the extent and mechanisms of X$_{B}$ retention in AGS SBR were evaluated. X$_{B}$ mass-balancing and magnetic resonance imaging (MRI) were applied. During the anaerobic plug-flow feeding, most X$_{B}$ was retained in the first few cm of the settled sludge bed within the interstitial voids, where X$_{B}$ settled and accumulated ultimately resulting in the formation of a filter-cake. Sedimentation and surface filtration were thus the dominant X$_{B}$ retention mechanisms during plug-flow conditions, indicating that contact and attachment of X$_{B}$ to the biomass was limited. X$_{B}$ retention was variable and influenced by the X$_{B}$ influent concentration, sludge bed composition and upflow feeding velocity (v$_{ww}$). ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000126487
Veröffentlicht am 22.11.2020
Originalveröffentlichung
DOI: 10.1016/j.wroa.2020.100075
Cover der Publikation
Zugehörige Institution(en) am KIT Engler-Bunte-Institut (EBI)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 01.12.2020
Sprache Englisch
Identifikator ISSN: 2589-9147
KITopen-ID: 1000126487
Erschienen in Water research X
Band 9
Seiten Art. Nr.: 100075
Schlagwörter Aerobic granular sludge, Municipal wastewater, Particulate substrate, Plug-flow feeding, Attachment, Flocs
Nachgewiesen in Scopus
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