Factors affecting nitrogen removal by nitritation/denitritation

Nitrogen removal from wastewater with high nitrogen concentration and low COD/N ratio via nitrite is advantageous. The specific character of the sludge liquor enables the application of such a method. The factors affecting process efficiency were studied. From the factors followed pH, NH4+/NH3 and N...

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Bibliographic Details
Published in:Water science and technology 2004-01, Vol.49 (5-6), p.73-79
Main Authors: Jenicek, P, Svehla, P, Zabranska, J, Dohanyos, M
Format: Article
Language:English
Subjects:
Ammonia
Ammonia - chemistry
Batch reactors
Bioreactors
Chemical oxygen demand
Hydrogen-Ion Concentration
Liquor
Nitrates - chemistry
Nitrogen
Nitrogen - isolation & purification
Nitrogen - metabolism
Nitrogen dioxide
Nitrogen removal
Operating costs
Oxidation
Oxygen - analysis
pH control
pH effects
Pretreatment
Primary sludge
Reactor technology
Removal
Sewage - chemistry
Sludge
Waste Disposal, Fluid - methods
Wastewater
Wastewater treatment
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Summary:Nitrogen removal from wastewater with high nitrogen concentration and low COD/N ratio via nitrite is advantageous. The specific character of the sludge liquor enables the application of such a method. The factors affecting process efficiency were studied. From the factors followed pH, NH4+/NH3 and NO2-/HNO2 concentration and distribution seem to be most important, using sequencing batch reactor technology and treating wastewater with high NH4+ concentration (above 1 g/l). The efficient oxidation of N-NH4+ to nitrite was achieved at a minimal nitrate production. Primary sludge was used as an internal source of substrate for the denitritation because of the organic substrate deficiency of the sludge liquor. The denitritation can be controlled by dosing of the primary sludge and can be complete. There are two operational alternatives of sludge liquor pretreatment: without pH control--lower operational costs and N-removal up to 65% and with pH control--higher operational costs and N-removal close to complete.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2004.0739