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Researchers from Technical University of Denmark Report Findings in Nitrogen

February 19, 2014

By a News Reporter-Staff News Editor at Biotech Week -- Investigators publish new report on Nitrogen. According to news reporting out of Kongens Lyngby, Denmark, by NewsRx editors, research stated, "Membrane-aerated biofilm reactors performing autotrophic nitrogen removal can be successfully applied to treat concentrated nitrogen streams. However, their process performance is seriously hampered by the growth of nitrite oxidizing bacteria (NOB)."

Our news journalists obtained a quote from the research from the Technical University of Denmark, "In this work we document how sequential aeration can bring the rapid and long-term suppression of NOB and the onset of the activity of anaerobic ammonium oxidizing bacteria (AnAOB). Real-time quantitative polymerase chain reaction analyses confirmed that such shift in performance was mirrored by a change in population densities, with a very drastic reduction of the NOB?Nitrospira and Nitrobacter and a 10-fold increase in AnAOB numbers. The study of biofilm sections with relevant 16S rRNA fluorescent probes revealed strongly stratified biofilm structures fostering aerobic ammonium oxidizing bacteria (AOB) in biofilm areas close to the membrane surface (rich in oxygen) and AnAOB in regions neighbouring the liquid phase. Both communities were separated by a transition region potentially populated by denitrifying heterotrophic bacteria. AOB and AnAOB bacterial groups were more abundant and diverse than NOB, and dominated by the r-strategists Nitrosomonas europaea and Ca. Brocadia anammoxidans, respectively."

According to the news editors, the research concluded: "Taken together, the present work presents tools to better engineer, monitor and control the microbial communities that support robust, sustainable and efficient nitrogen removal."

For more information on this research see: Sequentially aerated membrane biofilm reactors for autotrophic nitrogen removal: microbial community composition and dynamics. Microbial Biotechnology, 2014;7(1):32-43. Microbial Biotechnology can be contacted at: Blackwell Publishing Inc, 350 Main St, Malden, MA 02148, USA. (Wiley-Blackwell -; Microbial Biotechnology -

Our news journalists report that additional information may be obtained by contacting C. Pellicer-Nacher, Dept. of Environmental Engineering, Technical University of Denmark, Building 113, Miljovej, 2800, Kgs Lyngby, Denmark. Additional authors for this research include S. Franck, A. Gulay, M. Ruscalleda, A. Terada, W.A. Al-Soud, M.A. Hansen, S.J. Sorensen and B.F Smets (see also Nitrogen).

Publisher contact information for the journal Microbial Biotechnology is: Blackwell Publishing Inc, 350 Main St, Malden, MA 02148, USA.

Keywords for this news article include: Europe, Denmark, Nitrogen, Kongens Lyngby.

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Source: Biotech Week

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