摘要
以玉米秸秆为原料,在能将外源H2连续导入沼气发酵系统的装置中进行厌氧发酵,探索在发酵初始阶段连续通入不同量的外源H2,并在发酵稳定阶段接着通入适量的外源H2对厌氧发酵的影响。研究发现,相对于仅在发酵稳定期通适量外源H2,在发酵初始阶段通入适量外源H2可以提高沼气产量,且提纯效果更优,还可以促进挥发性脂肪酸(volatile fatty acids, VFAs)降解,最终沼液的pH略有上升。其中在发酵初始阶段通入3倍H2量,并在发酵稳定期接着通入5倍H2量时,沼气总产量和CH4总产量较高,高出对照组约21.1%、47.1%,提纯效果也较好,其平均CH4相对含量比对照组提高约32.1%,同时VFAs低于对照组最明显。该研究结果对于沼气原位纯化从而提高沼气利用效率具有重要指导意义。
Effect of continuous introduction of exogenous H2 on anaerobic fermentation was studied. Corn straw as raw material was used to conduct anaerobic fermentation in a device capable of continuously introducing exogenous hydrogen. The result found that supplying with appropriate amount of H2 in the initial stage of fermentation enhanced biogas production, and purification efficiency was better than supplying with only exogenous H2 during the stable fermentation period. It also promoted degradation of volatile fatty acids(VFAs) and slightly increased the pH of the biogas slurry. When the amount of H2 introduced during the initial stage increased by three times, and during the stabilization stage increased by five times, the total biogas production and total CH4 yield increased 21.1% and 47.1% than the control group, and the purification efficiency improved as well. The average relative content of CH4 was 83.5%, which was 32.1% higher than that of the control group, and VFAs was noticeably lower than the control group. The results provide critical guidance for in situ purification of biogas to improve biogas utilization efficiency.
作者
陈文佳
程玉娥
楼毕觉
林春绵
CHEN Wenjia;CHENG Yu′e;LOU Bijue;LIN Chunmian(College of Environment,Zhejiang University of Technology,Hangzhou 310014,China)
出处
《食品与发酵工业》
CAS
CSCD
北大核心
2019年第24期84-89,共6页
Food and Fermentation Industries
基金
中德合作项目—德国罗伯特·博世基金会(Robert Bosch Stiftung)基金资助项目(32.5.8003.0078.0)
关键词
外源H2
连续导入
厌氧发酵
甲烷
原位纯化
exogenous hydrogen
continuous introduction
anaerobic fermentation
methane
in situ purification
