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Department of Chemistry, University of Chouaib Doukkali, 24000 El Jadida, Morocco.
The study concerned the evolution of organic matter, and the humification process, during the co-composting of the organic fraction of municipal solid waste (OMSW) and poultry manure (PM); the study was made with two different mixtures (OMSW:PM ratios of 3:2 and 2:3, wet weight:wet weight) and two different particle sizes (1 and 0.2cm). The results suggested that the composting process proceeded unhindered throughout the degradation of easily degradable materials like hemicellulose, and that of the rather less degradable cellulose and lipids, and the concentration of recalcitrant material, i.e. a ligno-humic (LU) fraction. These processes were more evident for mixtures with lower particle size. Throughout the composting, in all mixtures studied, humification proceeded by the formation of a new HA fraction, which was probably the result of the partial degradation and solubilization of more complex insoluble organic molecules, i.e. humin fraction.
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