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Evolution of organic matter and nitrogen during co-composting of olive mill wastewater with solid organic wastes

AutorParedes, C.; Roig, Asunción ; Bernal Calderón, M. Pilar ; Sánchez-Monedero, Miguel Ángel ; Cegarra Rosique, Juan
Palabras claveOlive mill wastewater
Organic matter degradation
Nitrogen fractions
Fecha de publicación3-nov-2000
CitaciónBiology and Fertility of Soils 32(3): 222-227 (2000)
ResumenFour olive mill wastewater (OMW) composts, prepared with three N-rich organic wastes and two different bulking agents, were studied in a pilot plant using the Rutgers system. Organic matter (OM) losses during composting followed a first-order kinetic equation in all the piles, the slowest being the OM mineralisation rate in the pile using maize straw (MS). The highest N losses through NH3 volatilisation occurred in the mixtures which had a low initial C/N ratio and high pH values during the process. Such losses were reduced considerably when MS was used as the bulking agent instead of cotton waste (CW). N fixation activity increased during the bio-oxidative phase before falling during maturation. This N fixation capacity was higher in piles with a lower NH4 +-N concentration. Only the composts prepared with OMW, CW and poultry manure or sewage sludge reached water-soluble organic C (CW) and NH4 +-N concentrations and CW/Norg and NH4 +/NO3 – ratios within the established limits which indicate a good degree of compost maturity. Increases in the cation-exchange capacity, the percentage of humic acid-like C and the polymerisation ratio revealed that the OM had been humified during composting. The germination index indicated the reduction of phytotoxicity during composting.
Descripción6 pages, 4 tables, 2 figures.
Versión del editorhttp://dx.doi.org/10.1007/s003740000239
ISSN1432-0789 (Online)
0178-2762 (Print)
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