Partial nitrification to nitrite using low dissolved oxygen concentration as the main selection factor

Blackburne, Richard, Yuan, Zhiguo and Keller, Jurg (2008) Partial nitrification to nitrite using low dissolved oxygen concentration as the main selection factor. Biodegradation, 19 2: 303-312. doi:10.1007/s10532-007-9136-4


Author Blackburne, Richard
Yuan, Zhiguo
Keller, Jurg
Title Partial nitrification to nitrite using low dissolved oxygen concentration as the main selection factor
Journal name Biodegradation   Check publisher's open access policy
ISSN 0923-9820
Publication date 2008-01-01
Year available 2008
Sub-type Article (original research)
DOI 10.1007/s10532-007-9136-4
Open Access Status
Volume 19
Issue 2
Start page 303
End page 312
Total pages 10
Place of publication NEW YORK
Publisher SPRINGER
Language eng
Subject C1
1002 Environmental Biotechnology
Abstract Partial nitrification to nitrite (nitritation) can be achieved in a continuous process without sludge retention by wash out of nitrite oxidising bacteria (NOB) while retaining ammonia oxidising bacteria (AOB), at elevated temperatures (the SHARON process) and, as demonstrated in this paper, also at low dissolved oxygen (DO) concentrations. Enriched AOB was attained at a low DO concentration (0.4 mg l(-1)) and a dilution rate of 0.42 day(-1) in a continuous process. A higher oxygen affinity of AOB compared to NOB seemed critical to achieving this. This was verified by determining the oxygen half saturation constant, K-o, with similar oxygen mass transfer resistances for enriched AOB and NOB as 0.033 +/- 0.003 mg l(-1) and 0.43 +/- 0.08 mg l(-1), respectively. However, the extent of nitritation attained was found to be highly sensitive to process upsets.
Formatted abstract
Partial nitrification to nitrite (nitritation) can be achieved in a continuous process without sludge retention by wash out of nitrite oxidising bacteria (NOB) while retaining ammonia oxidising bacteria (AOB), at elevated temperatures (the SHARON process) and, as demonstrated in this paper, also at low dissolved oxygen (DO) concentrations. Enriched AOB was attained at a low DO concentration (0.4 mg l−1) and a dilution rate of 0.42 day−1 in a continuous process. A higher oxygen affinity of AOB compared to NOB seemed critical to achieving this. This was verified by determining the oxygen half saturation constant, K o, with similar oxygen mass transfer resistances for enriched AOB and NOB as 0.033 ± 0.003 mg l−1 and 0.43 ± 0.08 mg l−1, respectively. However, the extent of nitritation attained was found to be highly sensitive to process upsets.
Keyword Activated sludge
Continuous process
Dissolved oxygen concentration
Nitritation
Nitrite oxidising bacteria
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Advanced Water Management Centre Publications
 
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Created: Wed, 15 Apr 2009, 23:06:09 EST by Suzanne Read on behalf of Advanced Water Management Centre