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Please use this identifier to cite or link to this item: http://hdl.handle.net/10373/660

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Title: Combined organic carbon and complete nitrogen removal using anaerobic and aerobic upflow filters
Authors: Akunna, Joseph C.
Bizeau, Claude
Moletta, René
Bernet, Nicolas
Héduit, Alain
Affiliation: University of Abertay Dundee. School of Contemporary Sciences
Keywords: Anaerobic digestion
Denitrification
Nitrification
Methane
Nitrate
Ammonia
Anaerobic filter
Aerobic filter
Issue Date: 1994
Publisher: IWA Publishing
Type: Journal Article
Refereed: peer-reviewed
Rights: Published version ©IWA Publishing 1994. The definitive peer-reviewed and edited version of this article is published in Water Science and Technology, 30(12): pp.297-306, 1994. Available from http://www.iwaponline.com/wst/03012/wst030120297.htm and is available at www.iwapublishing.com.
Citation: Akunna, J., et al. 1994. Combined organic carbon and complete nitrogen removal using anaerobic and aerobic upflow filters. Water Science and Technology. 30(12): pp.297-306. Available from: http://www.iwaponline.com/wst/03012/wst030120297.htm
Abstract: Two laboratory upflow aerobic and anaerobic filters fed with synthetic wastewaters were used to study firstly the effects of aeration rate on the nitrification of anaerobically pre-treated effluents and secondly the effects of recycle-to-influent ratios on methane production rate, denitrification and nitrification performances of a combined aerobic and anaerobic wastewater treatment process. Nitrification of anaerobically pre-treated effluent was accompanied by aerobic post-treatment for residual COD removal. A comparison of nitrification performances using autotrophic medium and anaerobically pre-treated effluents (containing 1203 mg COD 1-1) with the same ammonia nitrogen concentration of about 300 mg NH4-N 1-1 showed that 3% of added ammonia nitrogen was assimilated by autotrophic nitrifiers during nitrification of the autotrophic medium while up to 30% was assimilated by both nitrifiers and heterotrophs during organic carbon removal and nitrification of anaerobically pre-treated effluent. Furthermore, it was suspected that significant nitrogen loss through denitrification occured in the aerobic filter especially at low aeration rates. In the study of the combined aerobic-anaerobic system, maximum ammonia nitrogen removal of 70% through denitrification was obtained at recycle-to-influent ratios of 4 and 5. COD removal efficiency in the anaerobic filter decreased from 77 to 60% for recycle-to-influent ratios of zero to 5. Overall COD removal efficiency of the entire system was constant at about 99% due to heterotrophic COD removal in the aerobic filter.
URI: http://hdl.handle.net/10373/660
ISSN: 0273-1223
Appears in Collections:Science Engineering & Technology Collection

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