Start-up strategies of membrane-aerated biofilm reactor (MABR) for completely autotrophic nitrogen removal

Sheng-Peng Sun, Carles Pellicer i Nàcher, Akihiko Terada, Susanne Lackner, Barth F. Smets

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Abstract

Completely autotrophic nitrogen removal, coupling aerobic and anaerobic ammonium oxidation, can be achieved via redox stratified biofilms growing on gas-permeable membranes. These sequential reactions are mediated by aerobic and anaerobic ammonium oxidizing bacteria (AOB and AnAOB). The major downside of this process stems from a long start-up period due to the slow growth rate of AnAOB. Therefore, two different start-up strategies, i.e., continuous inoculation of AnAOB and sequential batch inoculation of AOB and AnAOB, were tested in two laboratory scale membrane-aerated biofilm reactor (MABRs). Results indicate that the continuous inoculation strategy was more rapid and effective to achieve nitrogen removal than the sequential inoculation approach. Nitrogen loss in the reactor continuously inoculated with AnAOB was observed after 120 day operation, with an average NH4+-N and TN removal rate of 3.41 and 1.95 g-N/m2-membrane/day, respectively. On the other hand, nitrogen loss was hardly observed in the MABR with the sequential inoculation strategy.
Original languageEnglish
Title of host publicationProceedings of the 2nd IWA Specialized Conference on Nutrient Management in Wastewater Treatment Processes
PublisherIWA Publishing
Publication date2009
Pages633-639
Publication statusPublished - 2009
EventIWA Specialized Conference on Nutrient Management in Wastewater Treatment Processes - Krakow
Duration: 1 Jan 2009 → …
Conference number: 2

Conference

ConferenceIWA Specialized Conference on Nutrient Management in Wastewater Treatment Processes
Number2
CityKrakow
Period01/01/2009 → …

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