Simultaneous nitrification, denitrification, and phosphorus removal in a lab-scale sequencing batch reactor

Zeng, R. J., Lemaire, R., Yuan, Z. and Keller, J. (2003) Simultaneous nitrification, denitrification, and phosphorus removal in a lab-scale sequencing batch reactor. Biotechnology And Bioengineering, 84 2: 170-178. doi:10.1002/bit.10744


Author Zeng, R. J.
Lemaire, R.
Yuan, Z.
Keller, J.
Title Simultaneous nitrification, denitrification, and phosphorus removal in a lab-scale sequencing batch reactor
Journal name Biotechnology And Bioengineering   Check publisher's open access policy
ISSN 0006-3592
Publication date 2003-01-01
Sub-type Article (original research)
DOI 10.1002/bit.10744
Volume 84
Issue 2
Start page 170
End page 178
Total pages 9
Editor D. S. Clark
Place of publication Hoboken
Publisher John Wiley & Sons, Inc
Collection year 2003
Language eng
Subject C1
270399 Microbiology not elsewhere classified
770499 Other
Abstract Simultaneous nitrification and denitrification (SND) via the nitrite pathway and anaerobic-anoxic-enhanced biological phosphorus removal (EBPR) are two processes that can significantly reduce the energy and COD demand for nitrogen and phosphorus removal. The combination of these two processes has the potential of achieving simultaneous nitrogen and phosphorus removal with a minimal requirement for COD. A lab-scale sequencing batch reactor (SBR) was operated in alternating anaerobic-aerobic mode with a low dissolved oxygen (DO) concentration (0.5 mg/L) during the aerobic period, and was demonstrated to accomplish nitrification, denitrification, and phosphorus removal. Under anaerobic conditions, COD was taken up and converted to poly-hydroxyalkanoates (PHAs), accompanied by phosphorus release. In the subsequent aerobic stage, PHA was oxidized and phosphorus was taken up to <0.5 mg/L by the end of the cycle. Ammonia was also oxidized during the aerobic period, but without accumulation of nitrite or nitrate in the system, indicating the occurrence of simultaneous nitrification and denitrification. However, off-gas analysis showed that the final denitrification product was mainly nitrous oxide (N2O), not N-2. Further experimental results demonstrated that nitrogen removal was via nitrite, not nitrate. These experiments also showed that denitrifying glycogen-accumulating organisms (DGAOs), rather than denitrifying polyphosphate-accumulating organisms (DPAOs), were responsible for the denitrification activity. (C) 2003 Wiley Periodicals, Inc.
Keyword Biotechnology & Applied Microbiology
Simultaneous Nitrification
Denitrification And Phosphorus Removal (sndpr)
Denitrifying Glycogen-accumulating Organisms (dgaos)
Titration And Off-gas Analysis (toga)
nitrous oxide (N2O)
Nitrite Pathway
Glycogen-accumulating Organisms
Activated-sludge Systems
Waste-water
Nitrogen Removal
Metabolic Model
Stoichiometry
Release
Nitrite
Snd
Ph
Q-Index Code C1

 
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Created: Wed, 15 Aug 2007, 11:37:16 EST