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| Biogas production of unhydrolyzed solid from corn stover hydrolysate by anaerobic digestion |
| Received:September 09, 2015 |
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| KeyWord:corn stover;unhydrolyzed solild;anaerobic;methane;fermentation |
| Author Name | Affiliation | E-mail | | CHEN Shi-ping | School of Chemical Engineering, Sichuan University, Chengdu 610065, China | | | TANG Xiao-yu | Biogas Institute of Ministry of Agriculture, Chengdu 610041, China | tangxiaoyu@caas.cn | | XIAO Ze-yi | School of Chemical Engineering, Sichuan University, Chengdu 610065, China | mgch@scu.edu.cn | | WANG Wen-guo | Biogas Institute of Ministry of Agriculture, Chengdu 610041, China | | | YIN Xiao-bo | Biogas Institute of Ministry of Agriculture, Chengdu 610041, China | | | VENKATESH Balan | Department of Materials Science and Chemical Engineering, Michigan State University, Lansing 48910, USA | | | WU Bo | Biogas Institute of Ministry of Agriculture, Chengdu 610041, China | | | HU Qi-chun | Biogas Institute of Ministry of Agriculture, Chengdu 610041, China | |
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| Abstract: |
| Biochemical conversion in lignocellulosic biorefineries generates large amount of solid residues(Unhydrolyzed solids, UHS). The UHS mainly contains carbohydrates and lignin. Anaerobic digestion could be applied to convert those carbohydrates into CH4 and to naturally enrich lignin for further utilization, thus improving the economics of the whole biorefinery process. Here the methane production potential of UHS derived from corn stover biorefinery was investigated under different types of inoculum, diverse inoculum to substrate ratios(RI/S)and various fermentation temperatures. Results indicated that the biogas productivity of UHS was higher when using kitchen waste AD slurry as inoculum, and the cumulative methane production was up to 208.06 mL·g-1 VS. The cumulative methane production decreased with decrease in RI/S. When RI/S was in range of 0.1:1 to 3:1, the cumulative methane production was between 111.20 to 224.48 mL·g-1 VS and the UHS biodegradability ranged from 27.89% to 56.29%. The biodegradability of UHS decreased as substrate concentration increased. The cumulative methane production was similar at both 55℃ and 35℃ at the same RI/S, but the biogas production rate was much higher at 55℃. |
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