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Leachate pre-treatment strategies before 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 195 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) H2S concentration seems to control the nitrate reduction pathway: above a certain threshold of H2S, Dissimilatory Nitrate Reduction to Ammonium (DNRA) replaced denitrification. (2) N2O/N2 ratio varied with the organic carbon concentration : the lower the easily biodegradable carbon concentration, the higher the N2O/N2 ratio. (3) N2 was consumed after denitrification. The possibility of a nitrogen fixation reaction in the presence of NH4+ is discussed. 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 - 11:38:53 AM
Last modification on : Thursday, December 30, 2021 - 3:18:51 PM


  • HAL Id : hal-02586827, version 1
  • IRSTEA : PUB00018014



V. Vigneron, T. Bouchez, C. Bureau, N. Mailly, L. Mazeas, et al.. Leachate pre-treatment strategies before recirculation in landfill bioreactors. Anaerobic Digestion 2004, Montréal, CAN,29 Août-2 Septembre 2004, 2004, pp.671-677. ⟨hal-02586827⟩



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