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The water-soluble organic fraction and its relationships to the degree of maturity of organic matter during composting

AutorSánchez-Monedero, Miguel Ángel ; Roig, Asunción ; Bernal Calderón, M. Pilar
Palabras claveWater-soluble organic matter
Water soluble carbon
Fecha de publicación2001
EditorORBIT 2001
CitaciónBioprocessing of Solid Waste & Sludge 1 (1): 6 (2001)
ResumenThe evolution of different components of the water-soluble organic matter, water soluble carbon (COW), carbohydrates and phenols were studied during the composting of six different mixtures of organic wastes prepared with sweet sorghum bagasse, cotton waste, sewage sludge, municipal solid waste, urea, pine bark and brewery sludge. The COW, carbohydrate and phenol concentrations decreased in the six composting mixtures as a consequence of the organic matter degradation carried out by the microbial activity. The intensity of this organic matter degradation and the evolution of the water-soluble compounds depended on the kind of material used in the starting mixtures. Therefore, these parameters were not considered suitable to be used as the basis for a general organic matter stabilisation index. The changes in the water-soluble organic carbon to water-soluble organic nitrogen ratio (COW/NOW) and the water-soluble organic carbon to total organic nitrogen ratio (COW/NOT) were considered to be suitable as general stabilisation indices since these ratios did not depend on the material used. The evolution of these two ratios showed a similar pattern during the composting of the six mixtures studied. All mature composts reached values for these ratios which were in agreement with the ranges proposed by other authors with other type of materials. These maturity indices were also compared with Lepidium Sativum L. germination assays and no phytotoxic effects were found in materials with COW/NOW and COW/NOT ratios values between the limits established for mature composts (COW/OW between the range 5-6, and COW/NOT < 0.40).
Versión del editorhttp://www.orbit-online.net/journal
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