期刊
BIOLOGY AND FERTILITY OF SOILS
卷 32, 期 3, 页码 222-227出版社
SPRINGER-VERLAG
DOI: 10.1007/s003740000239
关键词
olive mill wastewater; composting; organic matter degradation; nitrogen fractions; humification
类别
Four 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 NH, volatilisation occurred in the mixtures which had a low initial CM 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 (C-W) and NH4+-N concentrations and C-W/N-org 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.
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