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A heterotrophic nitrifier, strain NR, was isolated from a membrane bioreactor. Strain NR was identified as Alcaligenes faecalis by Auto-Microbic system and16S rRNA gene sequence analysis. A. faecalis strain NR shows a capability of heterotrophic nitrification and N 2 O and N 2 production as well under the aerobic condition. Further tests demonstrated that neither nitrite nor nitrate...
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