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| Assessment of biomethane production from cured tobacco leaves using steam explosion pretreatment |
| Received:March 19, 2020 |
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| KeyWord:anaerobic fermentation;cured tobacco leaf;steam explosion;biochemical methane potential |
| Author Name | Affiliation | E-mail | | HUANG Hong-yi | College of Agronomy, Agricultural University of Hunan, Changsha 410128, China
Hunan BISEN Environmental & Energy Co., Ltd, Changsha 410100, China | | | XUE Han-guang | Hunan BISEN Environmental & Energy Co., Ltd, Changsha 410100, China | | | LI Chao | Hunan BISEN Environmental & Energy Co., Ltd, Changsha 410100, China
School of Environment, Tsinghua University, Beijing 100084, China | chao.li@novaskantek.com | | LI Juan | College of Agronomy, Agricultural University of Hunan, Changsha 410128, China
Hunan BISEN Environmental & Energy Co., Ltd, Changsha 410100, China | | | WANG Guan-hua | College of Light Industry Science and Engineering, Tianjin University of Science and Technology, Tianjin 300457, China | | | SHAO Si | Chinese Academy of Agricultural Engineering Planning & Design, Key Laboratory of Energy Resource Utilization from Agriculture Residue, Ministry of Agriculture and Rural Affairs, Beijing 100125, China | |
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| Abstract: |
| For utilizing organic waste of tobacco, discarded and cured tobacco leaves were subjected to medium-temperature anaerobic fermentation with steam explosion pretreatment. By comparing the biochemical methane potential(BMP)of cured tobacco in five different steam explosion gradients, the feasibility of steam explosion in cured tobacco anaerobic applications is discussed. The results show that the BMP value of untreated cured tobacco leaves(L0)is the highest, reaching 252.7 mL·g-1 VS, which is higher than most lignocellulosic wastes. Moreover, the methane production cycle is short, which means that it is a suitable material for fermentation. In the process of steam explosion, solid and liquid components of tobacco are separated and liquid sugar precipitation is hard to recover completely, resulting in the loss of part of the sugar that can be used to produce methane. Consequently, it is not favorable for methane production. Compared with that of untreated tobacco leaves(L0), the BMP of all tobacco samples after the steam explosion decreased; L1~L5 decreased by 11.6%, 23.0%,24.0%, 22.4%, and 26.3%, respectively. Although steam explosion pretreatment can open the material structure, it leads to a large loss of liquid sugar and decrease in methane production. Considering the value of the product and energy consumption of the pretreatment, it is better to directly use cured tobacco for anaerobic fermentation without steam explosion treatments, in practical applications. |
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