在中温(37±1)℃条件下,对经物理预处理后获得的纤维长度分别为0.23、2.70、4.10和4.12 cm的4种香蕉秸秆样品进行了批次厌氧发酵试验,考察了物理预处理对香蕉秸秆沼气发酵情况的影响,并分析了利用香蕉秸秆在工业规模制备沼气的可行性。结果表明,物理预处理强度的增强可以提高沼气发酵的日产气量及累积产气量,但对沼气中甲烷含量没有显著影响(甲烷含量在55.54%与63.88%之间)。纤维长度为0.23和2.70 cm时,高日产气量分别为333.6和319.8 mL/d,比4.10 cm和4.12 cm的样品高32.11%34.92%;沼气产率分别为306.49和340.13 mL/g(VS added),比4.10 cm和4.12 cm的样品高8.29%~17.36%。与小麦和玉米秸秆相比,利用香蕉秸秆制备沼气具备较好的应用前景。

The batch anaerobic fermentation at medium temperature( 37 ± 1℃) using physical treated banana pseudo stem samples with fiber length of 0.23,2.70,4.10 and 4.12 cm was conducted.The influence of physical treatment on anaerobic fermentation of banana pseudo stem and its feasibility for mass production of biogas was investigated.Results showed that increasing the strength of physical treatment could enhance the cumulative and daily biogas production of banana pseudo stem during biogas fermentation whereas have no significant impact on the methane concentration( between 55.54 % and 63.88 %).Samples with 0.23 and 2.79 cm fiber length obtained the highest daily biogas production of 333.6 and 319.8 mL/d,and the biogas yield of 306.49 and 340.13 mL/g VSadded,which were 32.11% ~ 34.92% and 8.29% ~ 17.36% higher than those of the 4.10 cm and 4.12 cm samples,respectively.Banana pseudo stem was recognized as a prospective material for producing biogas compared with wheat straw or corn straw.