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| Effect of anaerobic digestion on lignin derived from unhydrolyzed solid of corn stover |
| Received:April 01, 2020 |
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| KeyWord:unhydrolyzed solid;lignin;anaerobic digestion;structure;thermochemical property |
| Author Name | Affiliation | E-mail | | ZHAO Kun-yang | Biogas Institute of Ministry of Agriculture and Rural Affairs, Chengdu 610041, China | | | GAO Xiong-hui | Biogas Institute of Ministry of Agriculture and Rural Affairs, Chengdu 610041, China | | | ZHU Qi-li | Biogas Institute of Ministry of Agriculture and Rural Affairs, Chengdu 610041, China | | | TANG Xiao-yu | Biogas Institute of Ministry of Agriculture and Rural Affairs, Chengdu 610041, China | tangxiaoyu@caas.cn |
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| Abstract: |
| Fuel ethanol production from agricultural straw will produce a large amount of unhydrolyzed solids (UHS), which can be used to recover lignin. However, the existence of carbohydrates and other impurities will affect the high-value utilization of lignin. Thus, anaerobic digestion (AD) was employed to treat UHS. The structure and chemical properties of lignin were characterized by gel permeation chromatography, thermogravimetric analysis, fourier infrared spectroscopy, and nuclear magnetic resonance hydrogen spectroscopy. The carbohydrate contents of anaerobically digested solids were significantly reduced compared to UHS, while the total amount of lignin remained almost constant. The lignin was almost undegraded during AD. The results showed that the lignin of UHS and anaerobically digested solids presented similar structures and thermochemical properties, indicating that AD of UHS could preserve lignin structure while removing carbohydrates. |
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