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Abstract：
The main characteristic of discarded flue-cured tobacco leaves is their high nicotine content. Aerobic composting is an effective method to decrease the nicotine level in tobacco leaves and stabilize tobacco wastes. However, high levels of nicotine in discarded flue-cured tobacco leaves complicate tobacco waste composting. This work proposes a drying pretreatment process to reduce the nicotine content in discarded flue-cured tobacco leaves and thus enhance its carbon-to-nitrogen ratio to a suitable level for composting. The effect of another pretreatment method, particle size adjustment, on composting efficiency was also tested in this work. The results indicated that the air-dried (nicotine content: 1.35%) and relatively long discarded flue-cured tobacco leaves (25 mm) had a higher composting efficiency than damp (nicotine content: 1.57%) and short discarded flue-cured tobacco leaves (15 mm). When dry/25 mm discarded flue-cured tobacco leaves mixed with tobacco stems in an 8:2 ratio was composted at a temperature above 55 °C for 9 days, the nicotine content dropped from 1.29% to 0.28%. Since the discarded flue-cured tobacco leaves was successfully composted to a fertile and harmless material, the germination index values increased to 85.2%. The drying pretreatment and particle size adjustment offered ideal physical and chemical conditions to support microbial growth and bioactivity during the composting process, resulting in efficient conversion of discarded flue-cured tobacco leaves into a high quality and mature compost.
摘要：
废弃烤烟烟叶的主要特征是烟碱含量高。好氧堆肥是降低烟叶中尼古丁含量和稳定烟草废弃物的有效方法。然而,废弃的烤烟烟叶中的高尼古丁含量会使烟草废物堆肥复杂化。这项工作提出了一种干燥预处理工艺，以降低废弃的烤烟烟叶中的尼古丁含量，从而将其碳氮比提高到适合堆肥的水平。另一种预处理方法的效果，粒度调整，在这项工作中还测试了堆肥效率。结果表明，风干（尼古丁含量：1.35％）和相对较长的废弃烤烟叶（25mm）的堆肥效率高于潮湿（尼古丁含量：1.57％）和较短的废弃烤烟叶（15mm）。当干燥/25毫米丢弃的烤烟烟叶与烟梗以8：2的比例混合在55°C以上的温度下堆肥9天时，尼古丁含量从1.29%降至0.28%。由于废弃的烤烟烟叶被成功地堆肥成一种肥沃无害的材料，发芽指数值增加到85.2%。干燥预处理和粒度调整提供了理想的物理和化学条件，以支持堆肥过程中的微生物生长和生物活性。导致废弃的烤烟叶有效转化为高质量和成熟的堆肥。
