不同添加剂对青贮玉米秸秆厌氧消化产气特性的影响

Effects of Different Additives on Anaerobic Digestion of Corn Stover Silage

农作物秸秆是沼气生产的主要原料,但因其季节性收获特点,必须合理储存才能为沼气全年生产提供高质量原料。为探索不同储存条件下青贮玉米秸秆的产沼气潜力,文章研究比较了干黄秸秆(DC)、青贮秸秆(无添加剂,ME)和3种添加剂青贮秸秆(纤维素酶CB、布氏乳杆菌LB、异常毕赤酵母PA)在中温(37℃±1℃)条件的厌氧发酵特性和产沼气性能,并通过修正Gompertz模型比较产沼气潜力。结果表明,各青贮组的产气量及产甲烷量有所不同,但在整体上青贮对玉米秸秆产气特性的保存有积极作用。青贮过程并没有降低玉米秸秆的厌氧消化产气特性,甚至在产气和产甲烷等方面还略有提高。通过Gompertz方程的拟合,CB组最大产气量约为176.10 L,最大产甲烷速率约为6.38 L·d^-1,延滞期约为12 d,厌氧消化试验综合效果最佳。

Crop straw is the main raw material for biogas production,but due to its seasonal harvest characteristics,it must be reasonably stored to provide high-quality raw materials for the annual biogas production.In order to explore the biogas production potential of silage corn stover under different storage conditions,in this paper,the anaerobic fermentation characteristics and biogas production performance of different treated straw(dry yellow straw(DC),silage straw with no additive(ME),and three silage straw groups with different additives(cellulase CB,Lactobacillus bruciensis LB,and abnormal Pyretic yeast PA))were compared at medium temperature of 37℃±1℃,and the biogas production potential was compared by modified Gompertz model.The results showed that the gas production and methane production of different silage groups were different,but the all silage on the whole had a positive effect on the preservation of gas production characteristics of corn stover.The silage process did not reduce the biogas production of corn stover,and even slightly improved the biogas production.According to the Gompertz equation fitting,the maximum gas production of CB group obtained the best comprehensive result with the maximum gas production rate of 176.10 L and the maximum methane production rate of 6.38 L·d^-1,and the lag period was about 12 d.