Humification index (HI) as evaluation of the stabilization degree during composting |
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| Affiliation: | 1. University of Rostock, Institute of Biological Sciences, Cell Biology and Biosystems Technology, Albert-Einstein-Straße 3, D-18051 Rostock, Germany;2. Department of Safety and Radiation Protection, Radiation Biology Unit, Forschungszentrum Jülich GmbH, D-52425, Jülich, Germany;1. Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, 610041, China;2. Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, 610041, China;3. Maize Research Institute, Sichuan Agricultural University, Chengdu, 611130, China;4. College of Natural Resources and Environment, Northwest A&F University, Yangling, 712100, China;5. Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China;6. Department of Soil Science, University of Saskatchewan, Saskatoon, S7N 5A8, 51 Campus Drive, Canada;7. Panzhihua Branch of Sichuan Provincial Tobacco Company, Panzhihua, 617027, China;1. SEED - Sanitary Environmental Engineering Division, Department of Civil Engineering, University of Salerno, Via Giovanni Paolo II, 84084, Fisciano, SA, Italy;2. Federico II Naples University, Department of Structural and Functional Biology, Ecotoxicology Research Laboratory, I-80126, Naples, Italy |
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| Abstract: | The stabilization of a pile of ground urban refuse was monitored during five months. Carbon dioxide evolution, temperature, moisture level, organic matter, and pH were measured regularly. The humification index (HI) of organic matter extracted by 0.1 M Na4P2O7 plus 0.1 M NaOH was found to decrease linearly with time during the thermophilic phase from about 1.4 to 0.4. Turning of the pile caused a drop in the HI values, but the index increased again every time the temperature of the static pile reached 65°C. The value of the humification index in water extracts (HIw) reached a maximum after 4 d in the superficial layers and after 11 d at a depth of 30 cm. HIw values were found to decrease hyperbolically with time during the thermophilic phase. |
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