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- Title
Effect of environmental factors on the synergistic denitrification of Alcaligenes faecalis and ammonia oxidizing bacteria: a preliminary study.
- Authors
Linke Zheng; Ying Xu; Yu Hua; Xiaohu Dai
- Abstract
In wastewater treatment, ammonia oxidizing bacteria (AOB) can directly use hydroxylamine and NH3, but these bacteria grow slowly and have additional nutrient requirements. In contrast, Alcaligenes faecalis, a recently discovered functional bacterium, is able to conduct both heterotrophic nitrification and aerobic denitrification. Moreover, A. faecalis can produce hydroxylamine to support the growth of AOB. Therefore, it is expected that a co-culture system of these two bacteria may achieve better synergistic denitrification. In this study, the effects of environmental factors on the synergistic nitrogen- removal efficiency of A. faecalis No.4 and AOB were investigated. The experimental results showed that the nitrogen-removal rate decreased with an increase in the medium carbon-to-nitro-gen (C/N) ratio (from 1:1 to 3:1), whereas it increased with an increase in the stirring speed, which indicated that a low medium C/N ratio and a high stir speed benefited the synergistic denitrification of A. faecalis and AOB. In addition, the heterotrophic nitrification of A. faecalis and the ammonia oxidation of AOB proceeded better at 25°C than at 15°C. Further study revealed that, to some extent, the synergistic denitrification of A. faecalis and AOB increased with increases in the ratio of A. faecalis to AOB, and that high concentrations of A. faecalis did not inhibit AOB. The findings of this study are expected to enable the development of a new method for the removal of nitrogen from sewage and provide a theoretical basis for applications to AOB engineering.
- Subjects
AMMONIA-oxidizing bacteria; DENITRIFICATION; NUTRITIONAL requirements; WASTEWATER treatment; NITRIFICATION; NITROGEN removal (Water purification); NITROGEN removal (Sewage purification)
- Publication
Desalination & Water Treatment, 2020, Vol 192, p118
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2020.25617