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Oxidation-reduction potential (ORP) as a control parameter in a single-stage partial nitritation/anammox process treating reject water
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Land and Water Resources Engineering. Swedish Environmental Research Institute (IVL), Sweden.
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Land and Water Resources Engineering. Swedish Environmental Research Institute (IVL), Sweden. (Land and water resources engineering)
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Land and Water Resources Engineering.
KTH, School of Chemical Science and Engineering (CHE), Chemistry.
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2015 (English)In: Journal of chemical technology and biotechnology (1986), ISSN 0268-2575, E-ISSN 1097-4660Article in journal (Refereed) Epub ahead of print
Abstract [en]

BBACKGROUND: Redox potential value (or pE) can be used as a monitoring parameter for deammonification processes treating reject water. In this study its use as a control parameter was investigated. Experiments were carried out with a one-stage partial nitritation/anammox process in a 200 L moving bed biofilm reactor (MBBR) with 40% filled Kaldnes biofilm carriers. RESULTS: Tests on different combinations of nitrogen loads (1.8-3.3 gN m-2 d-1) and pE values (-1, 0, 1) revealed that process performance was stable and nitrogen removal efficiency >80% was achieved at all tested pE values except pE=-1. A value close to pE=0 was the most suitable in terms of process performance at 25°C at all tested pE values. With a fixed redox potential value (pE=0) used in the system, the air supply adjusted automatically under different nitrogen loads and maintained a high nitrogen removal efficiency. Theoretical calculations showed that pE>0.15 (at pH=7) provides conditions for nitrite conversion into nitrate at 25°C. CONCLUSION: Redox control turned out to be a suitable control parameter for operation of a partial nitritation/anammox process. A redox value of 0 was a suitable value under different nitrogen loads in this pilot-scale study. 

Place, publisher, year, edition, pages
John Wiley & Sons, 2015.
Keyword [en]
single-stage partial nitritation/anammox process, oxidation-reduction potential (ORP), process control strategy, reject water treatment
National Category
Water Engineering
Research subject
Civil and Architectural Engineering
Identifiers
URN: urn:nbn:se:kth:diva-186029DOI: 10.1002/jctb.4849OAI: oai:DiVA.org:kth-186029DiVA: diva2:924964
Note

QP 201604

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