Denitrifying phosphorus removal with nitrite by a real-time step feed sequencing batch reactor

BACKGROUND: Nitrite is toxic to anoxic phosphorus uptake when it exceeds a threshold concentration. In this study, denitrifying phosphorus removal with nitrite as electron acceptor was investigated in a sequencing batch reactor (SBR) operated using a real-time step feed strategy. RESULTS: The nitrit...

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Bibliographic Details
Published in:Journal of chemical technology and biotechnology (1986) 2011-04, Vol.86 (4), p.541-546
Main Authors: Peng, Yong-Zhen, Wu, Chang-Yong, Wang, Ran-Deng, Li, Xiao-Ling
Format: Article
Language:English
Subjects:
Applied sciences
Biological and medical sciences
Biotechnology
Chemical engineering
denitrifying phosphorus removal
Exact sciences and technology
Fundamental and applied biological sciences. Psychology
Methods. Procedures. Technologies
nitrite
Nitrites
Others
Phosphates
Phosphorus removal
Reactors
Real time
real-time control
SBR
Sequencing
step feed
Uptakes
Various methods and equipments
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Summary:BACKGROUND: Nitrite is toxic to anoxic phosphorus uptake when it exceeds a threshold concentration. In this study, denitrifying phosphorus removal with nitrite as electron acceptor was investigated in a sequencing batch reactor (SBR) operated using a real-time step feed strategy. RESULTS: The nitrite pulse concentration was initially determined by batch experiments. pH increased with use of nitrite for phosphate uptake, and decreased when the nitrite was used up. Nitrite was added promptly after the pH reached the peak value, and phosphate uptake continued, driven by the nitrite addition. The pH was adjusted to 7.50 using HCl with each pulse of nitrite addition. ORP could be used to determine the endpoint of denitrifiying phosphorus removal. However, the variation of second derivative of ORP with time was much more sensitive and should be a more suitable control parameter than ORP itself to determine the endpoint of denitrifying phosphorus removal. CONCLUSION: Compared with denitrifying phosphorus removal with nitrate as electron acceptor, denitrifying phosphorus removal with nitrite using real-time step feed can save 22.3% of polyhydroxyalkanoate (PHA) for phosphorus removal and 49.4% of PHA for nitrogen removal. In addition, the reaction time could be shortened. Copyright
ISSN:0268-2575
1097-4660
1097-4660
DOI:10.1002/jctb.2548