Influence of green waste, biowaste and paper-cardboard initial ratios on organic matter transformations during composting.
The influence of green waste, biowaste and paper-cardboard proportions in initial mixtures on organic matter (OM) evolution during composting in pilot-scale reactors was studied using respirometric procedure, humic substance extraction, crude fiber analysis and Fourier transform infrared spectroscopy. The stabilisation of OM during composting resulted from the degradation of easily biodegradable organic fraction as cellulose and hemicellulose, the relative increase of resistant compounds as lignin, the microbial synthesis of resistant biomolecules, and from humification processes. Little stabilisation of green waste OM during composting was observed, in relation with their large lignin content. With moderate contents of paper-cardboard in initial mixtures (20-40%), cellulose proportion remained favorable to fast OM stabilisation. Larger proportions of paper-cardboard (more than 50%) affected OM stabilisation, probably due to a lack of nitrogen. The influence of biowastes only appeared at the very beginning of composting, because of their large proportions of easily biodegradable OM.
Institut National de la Recherche Agronomique, AgroParis Tech, UMR Environnement et Grandes Cultures, 78850 Thiverval-Grignon, France.
Cédric
C
Francou
Monique
M
Linères
Sylvie
S
Derenne
Maelenn Le
ML
Villio-Poitrenaud
Sabine
S
Houot
D001673:Biodegradation, Environmental; D019149:Bioreactors; D006812:Humic Substances; D007700:Kinetics; D009930:Organic Chemicals / Q000378:metabolism*; D010209:Paper; D012987:Soil; D013055:Spectrophotometry, Infrared; D014866:Waste Products
D006812:Humic Substances; D009930:Organic Chemicals; D012987:Soil; D014866:Waste Products