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Combined organic carbon and complete nitrogen removal using anaerobic and aerobic upflow filters

Abstract : Two laboratory upflow aerobic 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 l(-1)) with the same ammonia nitrogen concentration of about 300 mg NH4-N l(-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. Further, 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-influents ratios of 4 and 5. COD removal efficiency in the anaerobic filter decreased from 77 to 60% for recycle-to-influents 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.
Mots-clés : CEMAGREF INRA LBEIAA DCO
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https://hal.inrae.fr/hal-02578187
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Submitted on : Thursday, May 14, 2020 - 6:47:35 PM
Last modification on : Friday, May 15, 2020 - 2:02:49 AM

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  • HAL Id : hal-02578187, version 1
  • IRSTEA : PUB00005705

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J. Akunna, C. Bizeau, Renatto Moletta, N. Bernet, A. Heduit. Combined organic carbon and complete nitrogen removal using anaerobic and aerobic upflow filters. Water Science and Technology, IWA Publishing, 1994, 30 (12), pp.297-306. ⟨hal-02578187⟩

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