INIBIOMA   20415
INSTITUTO DE INVESTIGACIONES EN BIODIVERSIDAD Y MEDIOAMBIENTE
Unidad Ejecutora - UE
artículos
Título:
Comprehensive quality assessment of municipal organic waste composts produced by different preparation methods
Autor/es:
TOGNETTI CELIA; MAZZARINO, M.J.; LAOS, F.
Revista:
WASTE MANAGEMENT (ELMSFORD)
Editorial:
PERGAMON-ELSEVIER SCIENCE LTD
Referencias:
Lugar: Amsterdam; Año: 2011 vol. 31 p. 1146 - 1152
ISSN:
0956-053X
Resumen:
In the first part of this work, the effect of municipal organic waste (MOW) composts on plant growth wasevaluated in a greenhouse trial. The treatments included soil amended with 14 different composts (preparedby shredding, adding wood shavings, cocomposting with biosolids or vermicomposting), an inorganicallyfertilized soil, and a control soil. All of the treatments significantly increased plant growthcompared to the control, and yields of three of the amended treatments were as high as that of the inorganicfertilizer treatment. When comparing differently prepared composts to the conventional compost,it was found that cocomposting MOW with biosolids was the method which most positively influencedyields (26–41% yield increases). In the second part of this work, we evaluated the effects of the differentpreparation methods on compost quality, using a multivariate approach. Three main quality aspects wereconsidered collectively in a principal component analysis: organic matter and nutrient concentrations,degradability and capacity to mineralize these nutrients, and plant growth. The model was restrictedto the first and second components (PC1 and PC1) which accounted for 94% of data variance. On theresulting factorial plane, four groups were distinguished. Each of the groups was compared to the referencecompost to determine quality increases or decreases. Based on this analysis, it was found thatcocomposting MOW with biosolids produced the highest quality products (higher total nutrient andOM concentration, nutrient mineralization potential, and plant growth). Addition of wood shavingsincreased OM concentration, but reduced quality in terms of the other aspects studied. Shredding wasonly effective to increase product quality when it was not combined with other methods, whereas vermicompostingonly increased quality when MOW was not mixed with biosolids.