Subject(s)
Choriocarcinoma , Liver Neoplasms/congenital , Lung Neoplasms/congenital , Placenta Diseases , Pregnancy Complications, Neoplastic , Puerperal Disorders , Uterine Neoplasms , Adult , Antineoplastic Combined Chemotherapy Protocols/administration & dosage , Antineoplastic Combined Chemotherapy Protocols/therapeutic use , Choriocarcinoma/diagnostic imaging , Choriocarcinoma/drug therapy , Female , Follow-Up Studies , Humans , Infant, Newborn , Liver Neoplasms/diagnostic imaging , Liver Neoplasms/drug therapy , Lung Neoplasms/diagnostic imaging , Lung Neoplasms/drug therapy , Male , Neoplasm Metastasis , Pregnancy , Pregnancy Complications, Neoplastic/drug therapy , Radiography, Abdominal , Radiography, Thoracic , Remission Induction , Time Factors , Tomography, X-Ray Computed , Ultrasonography , Uterine Neoplasms/diagnostic imaging , Uterine Neoplasms/drug therapyABSTRACT
Nitrified leachate recirculation represents a promising strategy for a more sustainable landfill management. Our objective was to determine the reactions involved in nitrate reduction in municipal solid waste batch biodegradation tests. Anaerobic digestion of waste in the three control reactors showed a good reproducibility. In two test reactors, nitrate was added at various moments of the waste degradation process. We observed that: (1) H2S concentration controlled 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.
