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Nitrified leachate recirculation in landfill bioreactors

Abstract : Nitrified leachate recirculation represents a promising strategy for a more sustainable landfill management. The objective of this research was to determine reactions involved in nitrate reduction in laboratory scale batch tests. Three control reactors without nitrate addition showed a classical and good reproducible behavior with acidogenic and methanogenic phases during the 200 days of experiment. In two test reactors, nitrate was added (250 mg N-NO3-/L) at various moments (Day 3, 17, 45 and 143) of the waste degradation process. We concluded that: (1) Variations of the N2O/N2 ratio were small when the organic carbon concentration was not limiting. (2) N2 was consumed after denitrification. The possibility of a nitrogen fixation reaction in the presence of NH4+ is discussed. (3) H2S concentration seems to control the nitrate reduction pathway: above a certain threshold of H2S, Dissimilatory Nitrate Reduction to Ammonium (DNRA) replace denitrification. Nitrified leachate recirculation during acidogenesis should be avoided because of higher H2S production which could induce DNRA.
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Submitted on : Friday, May 15, 2020 - 11:38:57 AM
Last modification on : Thursday, December 30, 2021 - 3:18:51 PM


  • HAL Id : hal-02586829, version 1
  • IRSTEA : PUB00018016



V. Vigneron, T. Bouchez, L. Mazeas, S. Moreau, J.M. Audic, et al.. Nitrified leachate recirculation in landfill bioreactors. Waste 2004,Stratford-Upon-Avon,GBR,28-30 septembre 2004, 2004, pp.9. ⟨hal-02586829⟩



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