Inoculum effects on community composition and nitritation performance of autotrophic nitrifying biofilm reactors with counter-diffusion geometry
作者： Akihiko Terada , Susanne Lackner , Ken Kristensen , Barth F. Smets
DOI: 10.1111/J.1462-2920.2010.02267.X
关键词:
摘要: The link between nitritation success in a membrane-aerated biofilm reactor (MABR) and the composition of initial ammonia- nitrite-oxidizing bacterial (AOB NOB) population was investigated. Four identically operated flat-sheet type MABRs were initiated with two different inocula: from an autotrophic nitrifying bioreactor (Inoculum A) or municipal wastewater treatment plant B). Higher efficiencies (NO(2)(-)-N/NH(4)(+)-N) obtained Inoculum B- (55.2-56.4%) versus A- (20.2-22.1%) reactors. biofilms had similar oxygen penetration depths (100-150 µm), but AOB profiles [based on 16S rRNA gene targeted real-time quantitative PCR (qPCR)] revealed peak densities at distant membrane surface A-initiated reactors, respectively. Quantitative fluorescence situ hybridization (FISH) that predominant B-initiated reactors Nitrosospira spp. (48.9-61.2%) halophilic halotolerant Nitrosomonas (54.8-63.7%), latter displayed higher specific activity than former (1.65 fmol cell(-1) h(-1) 0.79 ). These observations suggest NOB compositions inoculum may determine dominant MABR biofilm, which turn affects degree attainable MABR.
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