高效木质纤维素分解复合菌系降解稻草特性的研究
Research on characteristics of degrading straw by high efficient lignocelluloses degrading microbial community
-
摘要: 以1%稻草为惟一碳源，利用间歇实验，在50℃的静置培养条件下，对特异驯化获得的一组高效木质纤维素复合菌系的生长及降解特性进行了深入的探讨。实验结果表明，复合菌系的优势菌是杆菌，其生长曲线显示典型的3阶段，即0～108 h的对数生长期、108～144 h的稳定期、144～216 h的衰亡期。当发酵结束时，稻草的降解效率达到75%，90%以上的产物是乙酸，其次是少量的乙醇、丁酸和丙酸，这种发酵类型为下游两相厌氧消化的产甲烷相的稳定、高效运行提供重要物质基础。Abstract: In order to investigate the growth and degradation characteristics of a microbial community with high degradation efficiency on lignocelluloses, a batch test was carried out under static condition at 50℃, and 1% rice straw was the only carbon source. The result indicates that dominant bacteria of the microbial community are bacilli, and growth curve shows typical three stages, they are 0～108 h logarithmic stage, 108～144 h stable stage and 144～216 h decline stage, respectively. The degradation rate of rice straw may reach 75% when fermentation terminated. Over 90% metabolite is acetic acid, and there is little ethanol, butyric acid and propionic acid in fermentative products. This fermentation type will provide essential material base for stable and effective operation of downstream methanogenic phase in twophase anaerobic digestion process.
-
Key words:
- lignocellulose /
- microbial community /
- degradation characteristics /
- volatile fatty acids
-
点击查看大图
计量
- 文章访问数: 2134
- HTML全文浏览数: 985
- PDF下载数: 859
- 施引文献: 0
下载:
