工艺条件对厨余垃圾生物干化效果的影响

Effect of Process Conditions on Bio-drying of Kitchen Waste

为了研究各工艺条件(调理剂类型、调理剂添加比例、通风速率)对厨余垃圾生物干化效果的影响,为厨余垃圾生物干化工程应用提供指导。分别选取3种调理剂、4个调理剂添加比例、4个通风速率,分析生物干化过程中物料的温度、含水率、挥发性固体(volatile solid,VS)降解率变化,评价其生物干化效果。结果表明:添加木屑作为调理剂可以缩短升温期、延长高温期。加入木屑的处理组物料含水率降幅为31.97%,比只有厨余垃圾的对照组高18.57%。添加15%木屑的处理组生物干化效果最佳,温度最高可达63.8℃,含水率降低了32.36%。不同的通风速率影响物料的温度和水分的散失,通风速率为0.4 L/(kg·min)时有机物消耗最少,水分去除效果最佳。实际厨余垃圾生物干化工业应用可以考虑添加15%木屑做为调理剂,通风速率设为0.4 L/(kg·min)。

To guide the engineering application of bio-drying of kitchen waste,the effect of process conditions(bulking agent,proportion of bulking agent,air-flow rate)on bio-drying of kitchen waste were investigated three bulking agents,four proportions of bulking agent and four gradients of air-flow rate were selected in bio-drying process.Temperature,moisture content and volatile solid(VS)removal rate were analyzed to assess the bio-drying effect.The results show that adding sawdust can shorten the heating phase and prolong the thermophilic phase.The moisture content reduction of adding sawdust is 31.97%,18.57%higher than control group with only kitchen waste.Adding 15%sawdust shows the best bio-drying effect.The highest temperature is 63.8℃and the moisture content reduces by 32.36%.Different air-flow rates affect temperature accumulation and moisture loss of materials.At an air-flow rate of 0.4 L/(kg·min),the organic matter consumption is the least and water removal effect is the best.In the actual application of bio-drying of kitchen waste,15%sawdust can be considered as the bulking agent,and air-flow rate is 0.4 L/(kg·min).