期刊
BIORESOURCE TECHNOLOGY
卷 216, 期 -, 页码 830-837出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2016.06.029
关键词
Rice straw; Mechanical milling; Methane fermentation; Nanofiltration; Nuclear magnetic resonance
资金
- Special Coordination Fund for Promoting Science and Technology, Creation of Innovative Centers for Advanced Interdisciplinary Research Areas (Innovative Bio-production, Kobe)
- Ministry of Education, Culture, Sports, Science, and Technology (MEXT), Japan
- MEXT, Japan
- Osaka Gas Co., Ltd., Japan
Rice straw was mechanically milled using a process consuming 1.9 MJ/kg-biomass, and 10 g/L of unmilled or milled rice straw was used as the carbon source for methane fermentation in a digester containing carbon fiber textile as the supporting material. Milling increased methane production from 226 to 419 mL/L/day at an organic loading rate of 2180 mg-dichromate chemical oxygen demand/L/day, corresponding to 260 mL(CH4/gVS). Storage of the fermentation effluent at room temperature decreased the weight of the milled rice straw residue from 3.81 to 1.00 g/L. The supernatant of the effluent was subjected to nanofiltration. The black concentrates deposited on the nanofiltration membranes contained 53.0-57.9% lignin. Solution nuclear magnetic resonance showed that lignin aromatic components such as p-hydroxyphenyl (H), guaiacyl (G), and syringyl (S) were retained primarily, and major lignin interunit structures such as the beta-O-4-H/G unit were absent. This combinational process will aid the complete utilization of rice straw. (C) 2016 Published by Elsevier Ltd.
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