Changes in carbon fractions during composting and maturation of organic wastes |
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Authors: | Carlos Garcia Teresa Hernandez Francisco Costa |
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Institution: | (1) Department of Organic Resources, Centro de Edafología y Biología Aplicada del Segura, Apartado 4195, 30080 Murcia, Spain |
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Abstract: | Seven mixtures from four organic residues—an aerobic sewage sludge, a city refuse, a peat residue, and a grape debris—were
composted, and the changes undergone by their different carbon fractions during their composting and maturation were studied.
In most cases a decrease in carbon fractions during the composting and maturation processes was observed. The extractable
carbon, however, increased during maturation. Organic matter mineralization was greater in the composts with city refuse than
in those with sewage sludge. The samples with peat residue showed the lowest decreases in carbon fractions. During maturation,
an increase of humiclike fraction was observed, which was reflected by a decrease in the soluble carbon-precipitated carbon
ratio at pH 2. Water-soluble carbon was the carbon fraction most easily degradable by microorganisms, and its amount correlated
significantly with composting time in all the samples. |
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Keywords: | Compost Composting process Humification process Index of compost maturity Organic matter mineralization |
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