Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/31181
Title: Efficient single-stage autotrophic nitrogen removal with dilute wastewater through oxygen supply control
Authors: Kwak, W
McCarty, PL
Bae, J
Huang, YT
Lee, PH 
Keywords: Anaerobic ammonium oxidation (Anammox)
Autotrophic nitrogen removal
Dilute wastewater
Partial nitrification
Precise oxygen supply
Issue Date: 2012
Publisher: Elsevier
Source: Bioresource technology, 2012, v. 123, p. 400-405 How to cite?
Journal: Bioresource technology 
Abstract: Autotrophic nitrogen removal via ammonia oxidizing (AOB) and anaerobic ammonium oxidizing (anammox) bacteria was evaluated for treatment of a dilute 50mg/L ammonia-containing solution in a single-stage nitrogen-removal filter at 25°C. Important was an external oxygenation system that permitted close control and measurement of oxygen supply, a difficulty with the generally used diffused air systems. Hydraulic retention time (HRT) was reduced in steps from 15 to 1h. At 1h HRT, total nitrogen (TN) removals varied between 73% and 94%, the maximum being obtained with a benchmark oxygenation ratio of 0.75mol O2/mol ammonia fed. At higher ratios, nitrate was formed causing TN removal efficiency to decrease. With lower ratios, TN and ammonia removals decreased in proportion to the decrease in BOR. When operating at or below the BOR, nitrate formation equaled no more than 2% of the ammonia removed, a value much less than has previously been reported.
URI: http://hdl.handle.net/10397/31181
ISSN: 0960-8524
EISSN: 1873-2976
DOI: 10.1016/j.biortech.2012.07.076
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