摘要
为探究冷冻真空干燥预处理对烤后废弃烟叶产甲烷潜力的影响,实现烤后废弃烟叶的资源化利用,促进碳中和背景下烟草行业绿色清洁生产体系的发展,对烤后废弃烟叶分别进行0、1、3、5、10 h冷冻真空干燥预处理(L1~L5),比较了预处理前后烤后废弃烟叶表面微观结构、木质纤维素结构、总糖含量、烟碱含量等的变化,并对烤后废弃烟叶进行了产甲烷潜力(BMP)测试分析。结果显示:未预处理(L0)与L1~L5处理烤后废弃烟叶BMP值(以单位质量挥发性固体在厌氧条件下的产甲烷量表示)分别为200.74、208.64、220.98、224.28、211.11、209.30 mL·g^(-1),预处理较未预处理BMP分别增加了3.94%、10.08%、11.73%、5.16%及4.26%。经冷冻真空干燥预处理后,烟叶表面呈现褶皱和卷曲,产生疏松多孔的物理结构,有效增大了微生物接触面积。但长时间的真空干燥除了较大程度增加预处理能耗,还会造成烟叶有机成分的损失。因此,基于预处理能耗成本和甲烷产量效益的综合考虑,应控制冻干时长,进一步优化预处理工艺。
This study aimed to explore the effect of pretreatment by freeze-vacuum drying on the biochemical methane potential(BMP)of waste cured tobacco leaves,in order to improve their utilization and promote the development of a greener and cleaner production system that would help tobacco companies around the world fulfil their pledges on carbon neutrality.Waste cured tobacco leaves were pretreated by freeze-vacuum drying for 0,1,3,5 h,and 10 h.The surface microstructures,lignocellulosic structures,total sugar contents,and nicotine contents of the samples were compared,and their BMP were calculated.The BMP of waste cured tobacco leaves were 200.74,208.64,220.98,224.28,211.11 mL·g^(-1),and 209.30 mL·g^(-1)(calculated by CH_(4) production per gram of volatile solid),respectively.Compared with that of untreated leaves,the BMP of waste cured tobacco leaves pretreated for 0,1,3,5 h,and 10 h increased by 3.94%,10.08%,11.73%, 5.16%, and 4.26%, respectively. After freeze-vacuum drying, the surface of the leaves became wrinkled and curled, and presented a loose and porous physical structure, which could effectively increase the area of contact with microorganisms. However, long-term freeze vacuum drying not only increased the energy consumption to a large extent, but also caused the loss of organic components of the material. Finally, the recommended pretreatment time was calculated based on the balance between the energy derived from methane production and that required for freeze-vacuum drying, which is essential for assessing the sustainability of this process.
作者
徐建雪
薛寒光
黄弘毅
何岳巍
韩睿
彭星
黎娟
XU Jianxue;XUE Hanguang;HUANG Hongyi;HE Yuewei;HAN Rui;PENG Xing;LI Juan(College of Agronomy,Hunan Agricultural University,Changsha 410128,China;Hunan BISEN Environmental&Energy Co.,Ltd.,Changsha 410100,China;Qinghai Key Laboratory of Vegetable Genetics and Physiology,Academy of Agriculture and Forestry Sciences,Qinghai University,Xining 810016,China;Hunan United Kitchen Waste Treatment Co.,Ltd.,Changsha 410022,China)
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2022年第5期1122-1130,共9页
Journal of Agro-Environment Science
基金
湖南省“湖湘青年英才”计划项目(2020RC3073)
长沙市科技重点项目(khl1902215)
青海省自然科学基金面上项目(2021-ZJ-921)
湖南省自然科学基金项目(2019JJ50239)。
关键词
厌氧发酵
烤后废弃烟叶
冷冻真空干燥
产甲烷潜力
anaerobic digestion
waste cured tobacco leave
freeze-vacuum drying
biochemical methane potential
