Effect of anoxic decay process on simultaneous nitrification denitrification in a membrane bioreactor operated without an anoxic tank

This study was focused on evaluating the role and the effect of anoxic decay on the extent of simultaneous nitrification-denitrification (SNdN) process sustained in a single membrane bioreactor. The membrane bioreactor was fed with relatively strong domestic sewage and operated at steady state at a...

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Bibliographic Details
Published in:Water science and technology 2010-01, Vol.61 (3), p.771-780
Main Authors: Sarioglu, M, Insel, G, Artan, N, Orhon, D
Format: Article
Language:English
Subjects:
Anoxia
Biodegradation, Environmental
Biomass
Bioreactors
Decay
Denitrification
Diffusion
Dye dispersion
Equipment Design
Evaluation
Household wastes
Hypoxia
Kinetics
Membrane reactors
Nitrification
Nitrites - chemistry
Nitrogen - isolation & purification
Nitrogen removal
Oxygen - analysis
Refuse Disposal - methods
Removal
Sewage
Sludge
Suspended particulate matter
Suspended solids
Waste Disposal, Fluid - methods
Water Purification
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Summary:This study was focused on evaluating the role and the effect of anoxic decay on the extent of simultaneous nitrification-denitrification (SNdN) process sustained in a single membrane bioreactor. The membrane bioreactor was fed with relatively strong domestic sewage and operated at steady state at a sludge age of 36 days at a corresponding suspended solids level maintained in the range of 17,500-21,000 mg/L. The SNdN could be sustained due to diffusion limitation of oxygen into the flocs. The evaluation identified an MLSS threshold level of around 17,000-18,000 mg/L below which nitrogen removal was essentially controlled by denitrification and above, the rate limiting mechanism shifted to nitrification maintaining total nitrogen removal efficiency of 85-95% for a typical domestic sewage. The contribution of anoxic decay process to the overall denitrification potential was evaluated as 60%, substantially higher than the remaining 40% associated with the anoxic growth during the SNdN process.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2010.853