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Nitrous oxide emissions from one-step partial nitritation/anammox processes
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering. (Land and Water Resources Engineering)
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering.
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering. (Land and Water Resources Engineering)
(English)Manuscript (preprint) (Other (popular science, discussion, etc.))
Abstract [en]

Measurements of nitrous oxide were made at pilot and full scale plants to evaluate greenhouse gas emissions from one-step partial nitritation/anammox processes applied in moving bed biofilm reactors (MBBRs) treating reject water. It was found that 0.51-1.29% and 0.35-1.33 % of the total nitrogen loads in the pilot and full scale reactor, respectively, were emitted as nitrous oxide. Between 80-90% of nitrous oxide emissions were in gaseous form and the rest amount was found in the reactor effluent; over 90% of nitrous oxide emissions occurred in the aerated period and less than 8% in the non-aerated period in the full scale study. Nitrous oxide productions/consumptions were closely related to aeration and the nitrogen loads applied in the system.

Keyword [en]
Gas phase, Liquid phase, Moving Bed Biofilm Reactor (MBBR), Nitrous oxide emission, Partial nitritation/anammox process
National Category
Engineering and Technology
Research subject
Civil and Architectural Engineering
Identifiers
URN: urn:nbn:se:kth:diva-186031OAI: oai:DiVA.org:kth-186031DiVA: diva2:924972
Note

QC 20160524

Available from: 2016-04-29 Created: 2016-04-29 Last updated: 2016-05-24Bibliographically approved
In thesis
1. The deammonification in Moving Bed Biofilm Reactors
Open this publication in new window or tab >>The deammonification in Moving Bed Biofilm Reactors
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Deammonification process appears to be a good alternative to treat reject water. In this thesis, control strategies were studied at pilot scale in order to optimise the deammonification process operated in a Moving Bed Biofilm Reactor (MBBR) for reject water treatment. The processes were monitored by microbial activity tests, Specific Anammox Activity (SAA), Oxygen Uptake Rate (OUR), and Nitrate Uptake Rate (NUR) tests, in order to measure the anammox, ammonium/nitrite oxidizers and denitrifiers activity. Aeration and redox as control parameters were tested. The results showed that intermittent aeration, with 15min non-aerated period in a one hour cycle, could reduce the aeration time without loss of process efficiency. A redox value of pE=0 gave the best operational condition even if there were different nitrogen loads applied in the system.

Pilot scale deammonification MBBR was tested towards to mainstream conditions. The reactor was run at different temperatures (25-19°C) to test the process stability and it was seen that the process started to become unstable when the temperature was at 19°C. Moreover, the combined treatment line, Upflow Anaerobic Sludge Blanket (UASB) reactor and MBBR with deammonification process, was established with the aim of being applied in mainstream treatment. The study results indicated that when the influent of the deammonification process shifted from reject water to UASB effluent (NH4+-N=100 mg/l), the process began to show unstable performance.

N2O was measured and compared in the deammonification process treating reject water in this study. Between 0.4% and 2 % of the nitrogen load was converted to N2O in pilot and full scale studies. The results indicated that there was no significant emission difference when the process was performed with continuous or intermittent aeration; the production and consumption of N2O was dependent on the nitrogen loads and DO concentration applied in the system.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2016. 41 p.
Series
TRITA-LWR. PHD, ISSN 1650-8602 ; 2016:05
National Category
Environmental Engineering
Research subject
Land and Water Resources Engineering
Identifiers
urn:nbn:se:kth:diva-185942 (URN)978-91-7595-920-7 (ISBN)
Public defence
2016-05-18, Sal F3, indstedtsvägen 26, Stockholm, 09:30 (English)
Opponent
Supervisors
Note

QC 20160429

Available from: 2016-04-29 Created: 2016-04-29 Last updated: 2016-04-29Bibliographically approved

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