Contribution of the lignocellulosic fraction of two-phase olive-mill wastes to the degradation and humification of the organic matter during composting |
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| Authors: | N Serramiá MA Sánchez-Monedero A Fernández-Hernández C García-Ortiz Civantos A Roig |
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| Institution: | 1. Department of Soil and Water Conservation and Organic Waste Management, Centro de Edafología y Biología Aplicada del Segura, CSIC, P.O. Box 164, 30100 Murcia, Spain;2. Centro IFAPA ‘Venta del Llano’, P.O. Box 50, 23620 Mengíbar, Jaén, Spain;1. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, China;2. Innovation Base of Groundwater & Environmental System Engineering, Chinese Research Academy of Environmental Sciences, Beijing, China;3. State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Beijing, China;4. College of Water Sciences, Beijing Normal University, Beijing, China;1. Instituto de Grasa, Spanish National Research Council (CSIC), Campus Universitario Pablo de Olavide – Ed. 46, Ctra. de Utrera, km. 1, Seville, Spain;2. University of Seville, Higher Technical School of Engineering, Department of Chemical and Environmental Engineering, Camino de los Descubrimientos, s/n, Seville, Spain;1. Department of Environmental and Natural Resources Management, University of Patras, Seferi 2, GR-30100 Agrinio, Greece;2. Institute of Chemical Engineering Sciences, FORTH, Stadiou Str., Platani, GR-26504 Patras, Greece;3. Department of Chemical Engineering, University of Patras, Gr-26504 Patras, Greece |
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| Abstract: | One of the main disadvantages in the composting of two-phase olive mill wastes (TPOMW) is the long time required for its transformation (up to 40 weeks). The aim of this work was to evaluate the relationship between the degradation of the lignocellulosic fraction of TPOMW and the organic matter (OM) mineralisation rate in four composting piles prepared with different bulking agents and N-sources used to enhance OM degradation. The kinetics of degradation of the lignocellulosic fraction was compared to conventional maturation and stability indices to evaluate its impact on the duration of the composting process. The composition of bulking agents mainly affected the water-soluble fraction which influenced the OM degradation rate (linear or exponential OM degradation pattern) at early stages of the composting process but it neither modified the duration of the process (between 34 and 36 weeks) nor the total OM degradation underwent by the piles. The high initial mineral N availability was a key factor to significantly enhanced microbial activity. The mixture with urea as N-source registered the most efficient degradation of hemicellulose, cellulose and lignin, reducing the thermophilic phase and the total duration of TPOMW composting. |
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