分类收集蔬菜垃圾与植物废弃物混合堆肥工艺实例研究

以分类收集的生活垃圾(主要为蔬菜垃圾)和破碎树枝为原料,采用条垛式堆肥工艺,在中试规模条件下考察了原料初始含水率、通风频率、翻堆频率、接种比例4种因素对混合堆肥效果的影响.同时,在试验的9种工况下,对温度、氧浓度、有机碳降解率、有机碳氮比(C/N)、腐殖质含量等指标进行测定.结果表明,堆肥42d时各堆体均已达到稳定化要求.经过比较肥分保持、腐殖化程度和能量投入等指标,获得的最优堆肥控制条件为:初始含水率65%,通风频率15min/60min(开/关),翻堆频率为每3d1次,产物接种比例5%.最优控制方案下的主发酵通风率仅为0.03L.min-1.kg-1(以VS计),可实现堆肥过程的低能耗,适合于我国村镇区域的应用条件.

Co-composting with sorted vegetable waste and green waste:A case sudy

Nine pilot-scale scenarios were carried out in windrow, to investigate the effects of water content, ventilation frequency, turning frequency and inoculation ratio on the co-composting of sorted municipal solid waste (mainly vegetable waste) and chipped branches. The composting parameters such as temperature, oxygen concentration, degradation content of carbon, ratio of organic carbon to organic nitrogen (C/N) and humus content showed that all of the composting products were stabilized after 42 days of co-composting. Considering the fertilizer holding ability, humus content and energy consumption, the optimal co-composting operation conditions were as follows: initial water content 65%, ventilation frequency 15 min on / 60 min off, turning frequency 1 time / 3 days and inoculation ratio 5.0%. The ventilation rate in the primary co-composting procedure was 0.03 L·min-1·kg-1 volatile solid, which was lower than the reported values and thus reduced energy consumption. Therefore, this method is suggested to be applied in villages and small towns in China.