猪粪稻秸超高温预处理促进后续堆肥腐殖化条件优化

以猪粪稻秸为原料，设计超高温预处理温度（75，85，95℃）、时间（2，4，8h）和通风量（0.3，0.6，0.9L/kgTS·h）的三因素三水平正交试验，研究不同超高温预处理条件对猪粪稻秸理化特性及后续模拟堆肥腐殖质生成的影响，结果表明，温度、时间和通气量对猪粪稻秸后续高温堆肥腐殖化系数影响各不相同，各因素对后续好氧发酵累腐殖化系数的影响大小顺序为大小顺序为预处理时间 > 温度 > 通气量；最佳超高温预处理条件为：预处理温度为95℃，停留时间为4h，通气量为0.6L/（kgTS·h），与CK相比，最佳预处理参数下猪粪稻秸后续高温发酵60d腐殖化系数提高119%，腐殖质、胡敏酸含量分别增加105%、116%，而富里酸含量降低17.2%，结合预处理前后物料理化特性变化规律分析，表明超高温预处理促进了大分子有机物降解为可溶性有机碳，促进了木质纤维素组分降解溶出，促使其更多转化为多酚，同时增加了腐殖质前体还原糖、氨基酸的含量，从而有利于腐殖质的生成.

Optimization of conditions for promotion of humic substance formation during subsequent composting with hythermal pretreatment for pig manure and rice straw

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.