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Bioresour Technol

Title:		"Stability and maturity of a green waste and biowaste compost assessed on the basis of a molecular study using spectroscopy, thermal analysis, thermodesorption and thermochemolysis"
Author(s):		Som MP; Lemee L; Ambles A;
Address:		"Universite de Poitiers, CNRS, UMR 6514, Poitiers, France"
Journal Title:		Bioresour Technol
Year:		2009
Volume:		20090513
Issue:		19
Page Number:		4404 - 4416
DOI:		10.1016/j.biortech.2009.04.019
ISSN/ISBN:		1873-2976 (Electronic) 0960-8524 (Linking)
Abstract:		"The organic matter (OM) of a green waste and bio waste compost was characterised over 8months and the observed evolution was correlated with physico-chemical parameters (temperature, pH, carbon content, C/N ratio). Thermochemolysis and thermodesorption were used to monitor bacterial activity (stability) whereas diffuse reflectance infrared fourier transform spectroscopy (DRIFTS) and thermodifferential analysis (TDA) permitted to determine the degree of OM humification (maturity). DRIFT spectroscopy and TDA provide two indicators of maturity since, with these two techniques, the signals associated with the biodegradable organic matter decrease relatively to the signals associated with refractory organic matter. This increase in R(TG) and R(IR) ratios between aromatic to aliphatic signals constitutes a proof for OM complexification. It correlates with humic acids/fulvic acids ratio known to be a maturity index. Pyrolysates are mainly constituted of lignin moieties, terpenoids, nitrogen containing compounds, carbohydrates (furanosic moiety), mono- and diacids (as methyl esters), and methoxyesters. The R(branched/linear) ratio between branched to linear acids traduces the evolution of the bacterial activity during composting. Moreover the R(di/mono) ratio between aliphatic mono to diacids correlates with the latter showing that diacids can occur from the biological oxidation of monoacids. These two ratios determined by thermochemolysis are useful to monitor the stability of compost. VOC, observed by thermodesorption are mainly constituted of terpenes, light acids, aldehydes and ketone. An unexpected result was obtained since the amount of phytol increases relatively to the isoprenoid ketone considered to originate from the latter"
Keywords:		"Adsorption Biodegradation, Environmental Carbon/analysis Dicarboxylic Acids/analysis Differential Thermal Analysis Environmental Restoration and Remediation/*methods Esters/analysis Fatty Acids/analysis Gas Chromatography-Mass Spectrometry Hydrogen-Ion Co;"
Notes:		"MedlineSom, M-P Lemee, L Ambles, A eng England 2009/05/16 Bioresour Technol. 2009 Oct; 100(19):4404-16. doi: 10.1016/j.biortech.2009.04.019. Epub 2009 May 13"