Biotransformation and losses of organic matter during co-composting of dairy sludge with cattle manure on the Reunion Island
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).
| Main Authors: | , , , |
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| Format: | conference_item biblioteca |
| Language: | eng |
| Published: |
INRA
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| Subjects: | Q70 - Traitement des déchets agricoles, F04 - Fertilisation, L01 - Élevage - Considérations générales, |
| Online Access: | http://agritrop.cirad.fr/570570/ http://agritrop.cirad.fr/570570/1/document_570570.pdf |
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| Summary: | 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). |
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