摘要
为了考察玉米秸秆水解残渣(Unhydrolyzed solid,UHS)的厌氧消化产甲烷潜力,研究了接种物类型、接种比例以及发酵温度对UHS产气性能的影响。结果表明,餐厨垃圾厌氧消化液作为接种物时,UHS具有较高的产气能力,累积甲烷产量达到208.06 m L·g^(-1)VS;UHS的累积甲烷产量与接种物对底物的比值(Inoculum to substrate ratios,RI/S)有关,其值随着接种比例的减小而逐渐降低,当接种比例RI/S为0.1∶1~3∶1时,累积甲烷产量为111.20~224.48 m L·g^(-1)VS,UHS的生物降解率为27.89%~56.29%,其降解能力随着底物浓度的升高而降低;在高温发酵(55℃)和中温发酵(35℃)条件下,相同接种比例的对照组中,UHS累积甲烷产量较为接近,但高温发酵的产气速率明显高于中温发酵。
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^-1VS. The cumulative methane production decreased with decrease in RI/S. When RI/Swas in range of 0.1∶1 to 3∶1, the cumulative methane production was between 111.20 to 224.48 mL·g^-1VS 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 ℃.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2016年第3期584-589,共6页
Journal of Agro-Environment Science
基金
四川省科技计划项目(NO.2014HH0018)
中国农业科学院科技创新工程(CAAS-ASTIP-2015-BIOMA)
关键词
玉米秸秆
水解残渣
厌氧
甲烷
发酵
corn stover
unhydrolyzed solild
anaerobic
methane
fermentation
