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Anammox in IFAS reactor for reject water treatment
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering.
2019 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The aim of this study was to evaluate the performance of the integrated fixed-film activated sludge (IFAS) reactor achieving partial nitritation/anammox process to treat reject water after dewatering of digested sludge. During the study period, dissolved oxygen setpoint, aeration mode and inflow loading were changed to evaluate their influence on the process performance and efficiency in the reactor. Four different values for dissolved oxygen setpoint were tested: 2.0 mg/L, 1.8 mg/L, 1.5mg/L and 1.3 mg/L. Three different aeration modes in a one-hour cycle were tested: 30 min, 35 min, 40 min. And two different inflow loadings were tested: 2 g N/m2∙d and 1.6 g N/m2∙d. Discussion and evaluation were based on laboratory analyses and online sensors. The highest achieved total inorganic nitrogen removal efficiency was 85.6%, at 40 min aeration per hour, 2.0 mg/L dissolved oxygen and with 2 g N/m2∙day inflow NH4-N loading. Specific anammox activity (SAA) tests were also done for the anaerobic ammonia oxidizing bacteria in biofilm attached to the carriers in the IFAS reactor, and the results showed that the bacteria could achieve a higher nitrogen removal rate than in the pilot-scale IFAS reactor.

Place, publisher, year, edition, pages
2019. , p. 43
Series
TRITA-ABE-MBT ; 19697
Keywords [en]
Deammonification, IFAS, Online sensors, Partial nitritation/Anammox, Reject water, Specific anammox activity
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-266470OAI: oai:DiVA.org:kth-266470DiVA, id: diva2:1385469
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Examiners
Available from: 2020-01-14 Created: 2020-01-14 Last updated: 2020-01-24Bibliographically approved

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CiteExportLink to record
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