Optimization of conditions for promotion of humic substance formation during subsequent composting with hythermal pretreatment for pig manure and rice straw
CAO Yun, HUANG Hong-ying, WU Hua-shan, XU Yue-ding, CHANG Zhi-zhou
1. Circular Agricultural Research Center, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Crop and Livestock Integrated Farming, Ministry of Agriculture, Nanjing 210014
The influences of hyperthermophilic pretreatment on physico-chemical properties and the formation of humic substances during the subsequent composting of pig manure and rice straw were investigated using an orthogonal experiment, The orthogonal experiment containing three factors, each with three levels, were conducted under different temperatures (75, 85, 95℃), heating intervals (2, 4, 8h) and ventilation (0.3, 0.6, 0.9L/kg TS·h), The results showed these three factors had different effects on the humification coefficient of the subsequent aerobic composting, The size of effects on the humification coefficient during the subsequent aerobic composting was in the order of pretreatment time, followed by temperature ventilation, The optimal hyperthermal pretreatment conditions were:95℃ for the temperature, 4h for the heating time and the aeration rate was 0.6L/kg TS·h, Compared with the control (CK), the humification coefficient of subsequent composting with pig manure and rice straw was increased by 119% under the optimal pretreatment conditions, The contents of total humic substance and humic acid were increased by 105% and 116%, respectively, while the fulvic acid content was decreased by 17.2%, Based on the variations of the physico-chemical characteristics before and after hyperthermal pretreatment, the results suggested that the hyperthermal pretreatment could promote the degradation of macromolecular organic matter into soluble organic carbon and degrade lignocellulosic components into to polyphenols, The precursors, such as the reduced sugars and amino acids, were also increased, which would in turn facilitate the formation of humic substances in composting.
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