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Mainstream wastewater treatment in integrated fixed film activated sludge (IFAS) reactor by partial nitritation/anammox process
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, Land and Water Resources Engineering. IVL Swedish Environmental Institute, Valhallavägen 81, Stockholm, Sweden.
2015 (English)In: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 198, 478-487 p.Article in journal (Refereed) Published
Abstract [en]

In this study the system based on the combination of biofilm and activated sludge (IFAS - integrated fixed film activated sludge) was tested and compared with a system that relies only on biofilm (MBBR - moving bed biofilm reactor) for nitrogen removal from municipal wastewater by deammonification process. By introduction of suspended biomass into MBBR the nitrogen removal efficiency increased from 36 +/- 3% to 70 +/- 4% with simultaneous 3-fold increase of nitrogen removal rate. Results of batch tests and continuous reactor operation showed that organotrophic nitrate reduction to nitrite, followed by anammox reaction contributed to this high removal efficiency. After sCOD/NH4-N ratio decreased from 1.8 +/- 0.2 to 1.3 +/- 0.1 removal efficiency decreased to 52 +/- 4%, while still maintaining 150% higher removal rate, comparing to MBBR. Activity tests revealed that affinity of NOB to oxygen is higher than affinity of AOB with half-saturation constants of 0.05 and 0.41 mg/L, respectively.

Place, publisher, year, edition, pages
2015. Vol. 198, 478-487 p.
Keyword [en]
Anammox, Deammonification, IFAS, Mainstream, MBBR
National Category
Water Engineering
Identifiers
URN: urn:nbn:se:kth:diva-177406DOI: 10.1016/j.biortech.2015.08.123ISI: 000363487500062Scopus ID: 2-s2.0-84942752825OAI: oai:DiVA.org:kth-177406DiVA: diva2:874573
Funder
VINNOVA
Note

QC 20151127

Available from: 2015-11-27 Created: 2015-11-20 Last updated: 2017-12-01Bibliographically approved
In thesis
1. Anammox-based systems for nitrogen removal from mainstream municipal wastewater
Open this publication in new window or tab >>Anammox-based systems for nitrogen removal from mainstream municipal wastewater
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Nitrogen removal from municipal wastewater with the application of deammonification process offers an operational cost reduction, especially if it is combined with a maximal use of organic content of wastewater for biogas production. In this thesis, two approaches for integration of the deammonification process into the municipal wastewater treatment scheme were studied.

The first approach is based on ammonium concentration from municipal wastewater by ion exchange followed by biological removal of ammonium from the concentrated stream by deammonification process. Experiments with synthetic and real municipal wastewater showed that strong acid cation resin is suitable for ammonium concentration due to its high exchange capacity and fast regeneration. Since NaCl was used for regeneration of ion exchange materials, spent regenerant had elevated salinity. The deammonification biomass was adapted to NaCl content of 10-15 g/L by step-wise salinity increase. The technology was tested in batch mode with 99.9 % of ammonium removal from wastewater with ion exchange and up to 95 % of nitrogen removal from spent regenerant by deammonification process.

The second studied approach was to apply anammox process to low-concentrated municipal wastewater in a moving bed biofilm reactor (MBBR) and integrated fixed film activated sludge (IFAS) system without a pre-concentration step. After a 5 months period of transition to mainstream wastewater the pilot plant was operated during 22 months and stable performance of one-stage deammonification was proven. Clear advantage of IFAS system was shown. The highest stable nitrogen removal efficiency of 70 % and a nitrogen removal rate of 55 g N/(m3·d) was reached. Moreover, the influence of operation conditions on competition between ammonium oxidizing bacteria (AOB) and nitrite oxidizing bacteria (NOB) was studied by literature review, batch tests and continuous pilot plant operation.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2017. 53 p.
Series
TRITA-LWR. PHD, ISSN 1650-8602 ; 2017:01
Keyword
Wastewater, Nitrogen removal, Ion exchange, Deammonification, Anammox, Mainstream
National Category
Water Treatment
Research subject
Land and Water Resources Engineering
Identifiers
urn:nbn:se:kth:diva-202960 (URN)978-91-7729-317-0 (ISBN)
Public defence
2017-04-06, F3, Lindstedtsvägen 26, Stockholm, 09:30 (English)
Opponent
Supervisors
Note

QC 20170309

Available from: 2017-03-09 Created: 2017-03-08 Last updated: 2017-03-09Bibliographically approved

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