NDLI: Nitrogen removal by co-occurring methane oxidation, denitrification, aerobic ammonium oxidation, and anammox

Content Provider	Springer Nature Link
Author	Waki, Miyoko Yasuda, Tomoko Yokoyama, Hiroshi Hanajima, Dai Ogi, Akifumi Suzuki, Kazuyoshi Yamagishi, Takao Suwa, Yuichi Tanaka, Yasuo
Copyright Year	2009
Abstract	The pathway for removing NO 3 − and NH 4 + from wastewater in the presence of both CH4 and O2 was clarified by studying microbial activity and community. Batch incubation tests were performed to characterize the microbial activity of the sludge, which was acclimatized in a bioreactor in which O2 and CH4 were supplied to treat wastewater containing NO 3 − and NH 4 + . The tests showed that the sludge removed significant amounts of NO 3 − and NH 4 + in the presence of CH4 and O2, and the presence of the activity of methane oxidation, denitrification, nitrification, and anammox in the sludge. It was estimated that the total inorganic nitrogen removal was attributed to denitrification associated with methane oxidation as 53.4%, microbial assimilation as 37.9%, and anammox as 8.7%. Nitrification also contributed to NH 4 + decrease as 34.5% and anammox as 6.4%. Anammox activity was unambiguously demonstrated by 29N2 production in anaerobic batch incubation with 15N-labeled inorganic nitrogen compounds. The presence of methane-oxidizing bacteria and candidate denitrifiers in the sludge was shown by denaturing gradient gel electrophoresis of 16S rRNA gene fragments. Clone library analysis of the PCR-amplified 16S rRNA gene fragment using specific primers for aerobic ammonium oxidizer and anammox revealed the presence of these bacteria. The results reveal that complex nitrogen-removal processes occur in the presence of CH4 and O2 by methanotroph, denitrifier, aerobic ammonium oxidizer, and anammox.
Starting Page	977
Ending Page	985
Page Count	9
File Format	PDF
ISSN	01757598
Journal	Applied Microbiology and Biotechnology
Volume Number	84
Issue Number	5
e-ISSN	14320614
Language	English
Publisher	Springer-Verlag
Publisher Date	2009-07-15
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Subject Keyword	Methanotroph Denitrifier Nitrifier Anammox Simultaneous removal of nitrate and ammonium Microbial Genetics and Genomics Microbiology Biotechnology
Content Type	Text
Resource Type	Article
Subject	Medicine Applied Microbiology and Biotechnology Biotechnology

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