Schwarz, Maximilian ; Behnisch, Justus ; Trippel, Jana ; Engelhart, Markus ; Wagner, Martin (2021)
Oxygen Transfer in Two-Stage Activated Sludge Wastewater Treatment Plants.
In: Water, 13 (14)
doi: 10.3390/w13141964
Artikel, Bibliographie

Kurzbeschreibung (Abstract)

Aeration is an energy-intensive process of aerobic biological treatment in wastewater treatment plants (WWTP). Two-stage processes enable energy-efficient operation, but oxygen transfer has not been studied in depth before. In this study, α-factors were determined with long-term ex situ steady-state off-gas measurements in pilot-scale test reactors (5.8 m height, 8.3 m³) coupled to full-scale activated sludge basins. A two-stage WWTP with more than 1 Mio population equivalent was studied over 13 months including rain and dry weather conditions. Operating data, surfactant concentrations throughout the two-stage process, and the effect of reverse flexing on pressure loss of diffusers were examined. The values of αmean, αmin, and αmax for design load cases of aeration systems were determined as 0.45, 0.33, and 0.54 in the first high-rate carbon removal stage and as 0.80, 0.69, and 0.91 in the second nitrification stage, respectively. The first stage is characterized by a distinct diurnal variation and decrease in α-factor during stormwater treatment. Surfactants and the majority of the total organic carbon (TOC) load are effectively removed in the first stage; hence, α-factors in the second stage are higher and have a more consistent diurnal pattern. Proposed α-factors enable more accurate aeration system design of two-stage WWTPs. Fouling-induced diffuser pressure loss can be restored effectively with reverse flexing in both treatment stages.

Typ des Eintrags:	Artikel
Erschienen:	2021
Autor(en):	Schwarz, Maximilian ; Behnisch, Justus ; Trippel, Jana ; Engelhart, Markus ; Wagner, Martin
Art des Eintrags:	Bibliographie
Titel:	Oxygen Transfer in Two-Stage Activated Sludge Wastewater Treatment Plants
Sprache:	Englisch
Publikationsjahr:	17 Juli 2021
Verlag:	IWA Publishing
Titel der Zeitschrift, Zeitung oder Schriftenreihe:	Water
Jahrgang/Volume einer Zeitschrift:	13
(Heft-)Nummer:	14
DOI:	10.3390/w13141964
Zugehörige Links:	https://doi.org/10.3390/w13141964 TUprints Zweitveröffentlichung
Kurzbeschreibung (Abstract):	Aeration is an energy-intensive process of aerobic biological treatment in wastewater treatment plants (WWTP). Two-stage processes enable energy-efficient operation, but oxygen transfer has not been studied in depth before. In this study, α-factors were determined with long-term ex situ steady-state off-gas measurements in pilot-scale test reactors (5.8 m height, 8.3 m³) coupled to full-scale activated sludge basins. A two-stage WWTP with more than 1 Mio population equivalent was studied over 13 months including rain and dry weather conditions. Operating data, surfactant concentrations throughout the two-stage process, and the effect of reverse flexing on pressure loss of diffusers were examined. The values of αmean, αmin, and αmax for design load cases of aeration systems were determined as 0.45, 0.33, and 0.54 in the first high-rate carbon removal stage and as 0.80, 0.69, and 0.91 in the second nitrification stage, respectively. The first stage is characterized by a distinct diurnal variation and decrease in α-factor during stormwater treatment. Surfactants and the majority of the total organic carbon (TOC) load are effectively removed in the first stage; hence, α-factors in the second stage are higher and have a more consistent diurnal pattern. Proposed α-factors enable more accurate aeration system design of two-stage WWTPs. Fouling-induced diffuser pressure loss can be restored effectively with reverse flexing in both treatment stages.
Freie Schlagworte:	aeration, alpha (α), fine-bubble diffusers, high-rate activated sludge systems (HRAS), off-gas, reverse flexing, surfactants, TOC F/M ratio, TOC sludge loading, wastewater treatment
Zusätzliche Informationen:	This article belongs to the Section Wastewater Treatment and Reuse
Fachbereich(e)/-gebiet(e):	13 Fachbereich Bau- und Umweltingenieurwissenschaften 13 Fachbereich Bau- und Umweltingenieurwissenschaften > Institut IWAR - Wasser- und Abfalltechnik, Umwelt- und Raumplanung 13 Fachbereich Bau- und Umweltingenieurwissenschaften > Institut IWAR - Wasser- und Abfalltechnik, Umwelt- und Raumplanung > Fachgebiet Abwassertechnik
Hinterlegungsdatum:	27 Jul 2021 06:35
Letzte Änderung:	15 Nov 2023 08:00
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Zugehörige Links:	https://doi.org/10.3390/w13141964 TUprints Zweitveröffentlichung
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