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Partial nitritation process assessment
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.
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering.
2005 (English)In: Vatten: tidskrift för vattenvård, ISSN 0042-2886, Vol. 61, no 3, 175-182 p.Article in journal (Refereed) Published
Abstract [en]

In this study, partial nitritation has the aim to oxidise a fraction of ammonium (about 50–60 %) into nitrite without following oxidation to nitrate. Experiments performed during eight months describe partial nitritation of supernatant from dewatering of digested sludge at Himmerfjärden wastewater treatment plant in the south Stockholm region. The process was the first step (reactor R1) and was followed by a second step (reactor R2) for oxidation of ammonium with nitrite to nitrogen gas. The evaluation was based on time series analysis and results from 15 profiles of inorganic nitrogen compounds and different operational parameters. The effluent Nitrite-to-Ammonium Ratio (NAR) depends on the influent supernatant composition (mainly ammonium concentration and alkalinity) and conditions in R1 (mainly dissolved oxygen concentration and drop in pH value). Modified methodology for biofilm was developed to measure Oxygen Uptake Rate (OUR) of ammonium and nitrite oxidisers.

Place, publisher, year, edition, pages
2005. Vol. 61, no 3, 175-182 p.
Keyword [en]
Free ammonia, nitrite, nitrite-to-ammonium ratio, oxygen uptake rate (OUR) test, partial nitritation, supernatant
National Category
Civil Engineering
Identifiers
URN: urn:nbn:se:kth:diva-9047OAI: oai:DiVA.org:kth-9047DiVA: diva2:14590
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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