Water Science & Technology Vol 66 No 5 pp 958–964 © IWA Publishing 2012 doi:10.2166/wst.2012.234
Influence of temperature and salinity on microbial structure of marine anammox bacteria
Takanori Awata, Katsuichiro Tanabe, Tomonori Kindaichi, Noriatsu Ozaki and Akiyoshi Ohashi
Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashihiroshima 739-8527, Japan E-mail: tomokin@hiroshima-u.ac.jp
Matsuo Corporation, Hachimankoji, Saga 840-8666, Japan
ABSTRACT
Anaerobic ammonium oxidation (anammox) is a type of biological oxidation mediated by a group of Planctomycete-like bacteria. Members of the genus Candidatus Scalindua are mainly found in marine environments, but not exclusively. This group is cultured using different inoculums and conditions; however, its optimal growth conditions are not clear. Additionally, little information is known about the factors that influence the activity and the selection of a population of marine anammox bacteria. This study was conducted to investigate the influence of temperature and salinity on the marine anammox community. To accomplish this, an up-flow fixed-bed column reactor was operated, and quantitative fluorescence in situ hybridization (FISH) with probes specific to dominant marine anammox bacteria was conducted. Anammox activity was observed at 20 and 30 °C, but not at 10 °C. A nitrogen removal rate of 0.32 kg TN m–3 day–1 was obtained at 20 °C. These results suggest that temperature affects the activity (nitrogen removal rate) of anammox bacteria, while salinity does not affect the activity in the marine anammox biofilm.
Keywords: community structure; marine anammox bacteria; salinity; temperature
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