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Study of the organic matter evolution during municipal solid waste composting aimed at identifying suitable parameters for the evaluation of compost maturity

Castaldi, Paola and Alberti, Guido and Merella, Roberto and Melis, Pietro (2005) Study of the organic matter evolution during municipal solid waste composting aimed at identifying suitable parameters for the evaluation of compost maturity. Waste Management, Vol. 25 (2), p. 209-213. ISSN 0956-053X. Article.

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DOI: 10.1016/j.wasman.2004.12.011

Abstract

In this work the composting process of municipal solid wastes was studied in order to characterize the transformations of organic matter, particularly humic acid (HA). A composting process, lasting three months, was monitored by chemical methods; the following parameters were measured: water-soluble carbon concentration (WSC) and humic substances content (humic and fulvic acid (FA)). The effects of humification on the molecular structure of humic acid (HA) were also evaluated by Fourier transform infrared (FT-IR) and 13C NMR spectroscopy. WSC concentration rapidly increased reaching a maximum at day-14 of the composting process and then declined. The humic and fulvic acid content (HA and FA, respectively) slightly increased during the process. The FT-IR and 13C NMR spectra of HA indicate a high rate of change in structure during composting. The groups containing aromatic and carboxylic C increased, while polysaccharides and other aliphatic structures degraded during composting, resulting in HA structures of higher aromaticity. Therefore, spectrometric measurements could provide information significantly correlated to conventional chemical parameters of compost maturity.

Item Type:Article
ID Code:4943
Status:Published
Refereed:Yes
Uncontrolled Keywords:Municipal solid waste, composting process, stability, maturity
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/13 Chimica agraria
Divisions:001 Università di Sassari > 01 Dipartimenti > Scienze ambientali agrarie e biotecnologie agro-alimentari
Publisher:Elsevier
ISSN:0956-053X
Additional Information:Paper presented at the VARIREI 2003, 4th International Congress on “Valorization and Recycling of Industrial Waste", L'Aquila, Italy, 24-27 June 2003.
Deposited On:24 Nov 2010 10:35

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