Nitrification of high strength ammonia wastewtaer treatment - process selection is the major factor.

Kim, D, Chang, J.S., Lee, D.I., Han, D.W., Yoo, I.K. and Cha, G.C. (2003) Nitrification of high strength ammonia wastewtaer treatment - process selection is the major factor.. Water Science and Technology, 47 11: 45-51.


Author Kim, D
Chang, J.S.
Lee, D.I.
Han, D.W.
Yoo, I.K.
Cha, G.C.
Title Nitrification of high strength ammonia wastewtaer treatment - process selection is the major factor.
Journal name Water Science and Technology   Check publisher's open access policy
ISSN 0273-1223
Publication date 2003
Sub-type Article (original research)
Volume 47
Issue 11
Start page 45
End page 51
Total pages 7
Editor P. Wilderer
Place of publication United Kingdom
Publisher IWA Publishing
Collection year 2003
Language eng
Subject C1
290602 Process Control and Simulation
770502 Land and water management
Abstract Biological nitrogen removal via the nitrite pathway in wastewater treatment is very important in Saving the cost of aeration and as an electron donor for denitrification. Wastewater nitrification and nitrite accumulation were carried out in a biofilm airlift reactor with autotrophic nitrifying biofilm. The biofilm reactor showed almost complete nitrification and most of the oxidized ammonium was present as nitrite at the ammonium load of 1.5 to 3.5 kg N/m3.d. Nitrite accumulation was stably achieved by the selective inhibition of nitrite oxidizers with free ammonia and dissolved oxygen limitation. Stable 100% conversion to nitrite could also be achieved even under the absence of free ammonia inhibition on nitrite oxidizers. Batch ammonium oxidation and nitrite oxidation with nitrite accumulating nitrifying biofilm showed that nitrite Oxidation was completely inhibited when free ammonia is higher than 0.2 mg N/L. However, nitrite oxidation activity was recovered as soon as the free ammonia concentration was below the threshold level when dissolved oxygen concentration was not the limiting factor. Fluorescence in situ hybridization analysis of cryosectioned nitrite accumulating nitrifying biofilm showed that the β-subclass of Proteobacteria, where ammonia oxidizers belong, was distributed outside the biofilm whereas the α-subclass of Proteobacteria, where nitrite oxidizers belong, was found mainly in the inner part of the biofilm. It is likely that dissolved oxygen deficiency or limitation in the inner part of the nitrifying biofilm, where nitrite oxidizers exist, is responsible for the complete shut down of the nitrite oxidizers activity under the absence of free ammonia inhibition.
Keyword fish
Inhibition
Nitrification
Nitrite accumulation
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2004 Higher Education Research Data Collection
Advanced Water Management Centre Publications
 
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Created: Wed, 15 Aug 2007, 01:40:20 EST