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Oxygen Uptake Rate (OUR) tests for assessment of nitrifying activities in the deammonification system
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering.
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering.
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering.
2005 (English)Report (Other academic)
Abstract [en]

The two-step deammonification system for nitrogen removal was established in a technical-scale pilot plant with moving-bed reactors with Kaldnes rings as biofilm carriers. The study consisted in observing the presence of nitrifiers in both activated sludge and biofilm in the partial nitritation reactor and in the Anammox reactor. Oxygen Uptake Rate (OUR) tests were used as a tool to assess qualitatively and quantitatively ammonia- and nitrite-oxidizing bacteria as well as heterotrophic activity. Thirteen series of OUR tests focussed on monitoring the activity of nitrifying microorganisms in the deammonification system. It was demonstrated that the nitrifying culture mostly forms biofilm in the partial nitritation reactor. The results confirmed that there is only insignificant nitrifying activity present in the Anammox reactor and it is mainly concentrated in the activated sludge. It is most likely that nitrifiers sustain oxygen-limited conditions for the Anammox bacteria. The moving-bed system is therefore appropriate to obtain efficient removal of nitrogen with taking advantage of the cooperation of many bacterial cultures.

Place, publisher, year, edition, pages
Stockholm: KTH , 2005. , 119-128 p.
Series
Trita-LWR Report, ISSN 1650-8610 ; 13
Keyword [en]
Anammox, activated sludge, biofilm, deammonification, oxygen uptake rate (OUR) test, partial nitritation
National Category
Civil Engineering
Identifiers
URN: urn:nbn:se:kth:diva-9048OAI: oai:DiVA.org:kth-9048DiVA: diva2:14591
Note
QC 20101108Available from: 2006-01-31 Created: 2006-01-31 Last updated: 2010-11-08Bibliographically approved
In thesis
1. Assessment of a partial nitritation/Anammox system for nitrogen removal
Open this publication in new window or tab >>Assessment of a partial nitritation/Anammox system for nitrogen removal
2006 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

This thesis evaluates the performance of a deammonification system designed as a two-step tech-nology consisting of an initial partial nitritation followed by an Anammox process. Operation of a technical-scale pilot plant at the Himmerfjärden Wastewater Treatment Plant (Grödinge, Swe-den) has been assessed. Oxygen Uptake Rate (OUR) to evaluate the respiration activity of nitrifi-ers in the system and batch tests to assess reaction rates have also been applied in the study. It was found that the total inorganic nitrogen elimination strongly depended on the nitrite-to-ammonium ratio in the influent to the Anammox reactor, which was correlated with the per-formance of the partial nitritation phase. Therefore, a control strategy for oxidation of ammo-nium to nitrite has been proposed. Controlled oxygen supply to the partial nitritation reactor is obligatory to obtain a proper pH drop indicating oxidation of ammonia to nitrite at the adequate ratio. A very high nitrogen removal efficiency (an average of 84%) and stable operation of the system have been reached. Conductivity measurements were also used to monitor the system influent nitrogen load and the nitrogen removal in the Anammox reactor. The data gathered from the operation of the pilot plant enabled the use of multivariate data analysis to model the process behaviour and the assessment of the covariances between the process parameters. The options for full-scale implementation of the Anammox systems have been proposed as a result of the study.

Place, publisher, year, edition, pages
Stockholm: KTH, 2006. xvi, 57 p.
Series
Trita-LWR. LIC, ISSN 1650-8629 ; 2034
Keyword
Biofilm; Deammonification; Nitrogen removal; Oxygen Uptake Rate (OUR); Partial nitritation/Anammox system
National Category
Civil Engineering
Identifiers
urn:nbn:se:kth:diva-604 (URN)91-7178-167-6 (ISBN)
Presentation
2006-02-02, V1, V, Teknikringen 72, KTH campus, 13:30
Opponent
Supervisors
Note
QC 20101115Available from: 2006-01-31 Created: 2006-01-31 Last updated: 2010-11-15Bibliographically approved

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http://www.lwr.kth.se/Forskningsprojekt/Polishproject/rep13/LuizaGutOUR119.pdf

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