外加热源对典型有机废弃物生物干化的影响

Effect of Additional Heating Source on Bio-drying of Typical Organic Wastes

通过对典型有机废弃物进行生物干化实验,探究了外加热源对生物干化效果的影响。在不加热和40℃加热两个条件下,对果蔬、厨余和园林垃圾等典型有机废弃物的生物干化效果进行了比较。结果发现,外加热源对不同基质干化效果的影响程度不同,但能够明显提升有机废弃物生物干化的效果。加热可使得反应器保持高温状态,使基体长期处于微生物代谢旺盛阶段,有利于生物干化。果蔬与园林垃圾协同干化时,升温累积值在10 d后达到了151℃·d,比不加热条件下高出111%。在加热条件下,园林垃圾独立干化的最终含水率能降到10.34%、生物干化指数为2.54、低位热值为13 920.8 kJ/kg,优于不加热条件。

Effect of additional heating source on bio-drying of typical organic wastes was investigated by bio-drying experiments.The bio-drying effect of typical organic wastes(such as fruit and vegetable waste,kitchen waste and garden waste)with 40℃heating or without heating was compared.The effects of additional heating source on different substrates were quite different,but heating could significantly improve the bio-drying efficiency of all organic wastes.Heating could keep the reactor at a high temperature and make the substrate degradation in the vigorous metabolism stage for a long time,which was beneficial to bio-drying.When fruits and vegetables were dried together with garden wastes,the cumulative value of heating reached 151℃·d after 10 days,which was 111%higher than that without heating.Under the condition of heating,the final moisture content of garden waste could be reduced to 10.34%,the bio-drying index was 2.54,and the lower heating value(LHV)was 13920.8 kJ/kg,which were better than those without heating.