Recirculation de lixiviat nitrifié dans une décharge-bioréacteur | Nitrified leachate recirculation in landfill bioreactors
2004
Vigneron, V. | Bouchez, T. | Mazeas, L. | Moreau, S. | Audic, J.M. | Hebe, I. | Bernet, N.
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.
اظهر المزيد [+] اقل [-]الكلمات المفتاحية الخاصة بالمكنز الزراعي (أجروفوك)
المعلومات البيبليوغرافية
تم تزويد هذا السجل من قبل Institut national de la recherche agronomique
