Biotransformation and losses of organic matter during co-composting of dairy sludge with cattle manure on the Reunion Island

Rafolisy Tovonarivo, Paillat Jean-Marie, Técher Patrick, Thuriès Laurent. 2013. Biotransformation and losses of organic matter during co-composting of dairy sludge with cattle manure on the Reunion Island. In : 15 ème Conférence internationale RAMIRAN: Recyclage des résidus organiques pour l'agriculture: de la gestion des déchets aux services écosystémiques, Versailles, France, 3 au 5 juin 2013. INRA. s.l. : INRA, 4 p. International Ramiran Conference. 15, Versaille, France, 3 Juin 2013/5 Juin 2013.

Résumé : The dairy sludge elimination is still not optimized in Reunion Island as it is currently dumped in landfills. The aim of this study is to investigate the co-composting of dairy sludge with cattle manure. Three heaps were formed using cattle manure mixed with dairy sludge in the following proportions: M - 1 + 0, S1 -2/3 + 1/3 and S2 - 1/2 + 1/2. The heaps were turned after 21 days. Total composting time was 142 days. During the experimentation, temperature remained high and above 55°C during 46 days for the pure manure pile M, 32 days for S1 pile and 36 days for S2 pile. During composting, M has lost 69% of its fresh mass and 64% of its initial volume while 71% and 44% respectively for S1 and 68% and 49%, respectively for S2. Heaps have lost from 44% to 49% of the initial organic matter and the windrows formed with sludge lost more nitrogen than the pure manure one (M - 52%, S1 - 69% and S2 - 66% of its initial nitrogen).

Classification Agris : Q70 - Traitement des déchets agricoles
F04 - Fertilisation
L01 - Élevage - Considérations générales

Auteurs et affiliations

• Rafolisy Tovonarivo, LRI (MDG)
• Paillat Jean-Marie, CIRAD-PERSYST-UPR Recyclage et risque (REU) ORCID: 0000-0001-6353-6265
• Técher Patrick, CIRAD-PERSYST-UPR Recyclage et risque (REU)
• Thuriès Laurent, CIRAD-PERSYST-UPR Recyclage et risque (REU) ORCID: 0000-0002-1365-7891

Source : Cirad - Agritrop (https://agritrop.cirad.fr/570570/)

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