Émission d''effluents gazeux lors du compostage de substrats organiques
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L''agriculture est responsable d''une part importante des �missions d''ammoniac (NH3) et de protoxyde d''azote (N2O) dans l''atmosph�re. La lutte contre la pollution et contre le r�chauffement climatique n�cessite qu''elles soient minimis�es. Le compostage est un proc�d� tr�s utilis� dans les fili�res de production agricole et de traitement de sous-produits. Lors d''un travail en halle exp�rimentale, l''augmentation du rapport carbone/azote et l''addition de compos�s ou microorganismes ad�quats ont fait passer les pertes en N-NH3 de 55 � 7% de l''azote initial d''andains de 2 m3 pour une dur�e de 1,5 mois. Celles de N2O sont rest�es faibles (0,2-0,9%). Sur le terrain, la production de N2O a �t� associ�e � des activit�s de nitrification/d�nitrification. Elle a principalement eu lieu en phase de maturation. L''exp�rimentation sur des andains de 10 et 25 m3 a montr� qu''ils doivent �tre consid�r�s comme des �cosyst�mes � part enti�re compos�s de diff�rents compartiments o� les populations microbiennes s''organisent diff�remment, les points d''entr�e d''air �tant producteurs de N2O, le fond et la sortie, producteurs, en �quilibre ou consommateurs suivant les moments.
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