甘蔗渣霉变对厌氧发酵产沼气的影响

Effect of Moldy Sugarcane Bagasse on Biogas Production by Anaerobic Fermentation

为探究霉变对甘蔗渣厌氧发酵产沼气的影响,本研究选取正常的甘蔗渣和霉变的甘蔗渣,对其结构、理化性质、发酵过程参数和物质去除率进行测定。结果表明,霉变的甘蔗渣结构被破坏,且表面存在较多的附着物和微生物。与正常的甘蔗渣相比,霉变的甘蔗渣含水量提高44.6%,可溶性糖含量降低95.4%,总氮含量提高48.6%,木质纤维素含量增加。在厌氧发酵过程中,正常甘蔗渣的溶解性化学需氧量最高值(3 229.0 mg/L)是霉变的甘蔗渣的3.4倍,且正常的甘蔗渣的总挥发酸(Total Volatile Fatty Acids, TVFA)最大值为1 855.8 mg/L,比霉变的甘蔗渣高26.2%。此外,霉变的甘蔗渣总固体(Total Solids, TS)去除率比正常的甘蔗渣减少17.2%,挥发性固体(Volatile Solids, VS)去除率仅为正常甘蔗渣的56.7%,累积沼气产量和甲烷产量比正常的甘蔗渣分别降低60.6%和77.9%。综上,甘蔗渣霉变后结构遭到破坏,可溶性糖含量急剧下降,产沼气潜力大大降低。

In order to explore the effect of moldy sugarcane bagasse on biogas production by anaerobic fermentation,normal sugarcane bagasse and moldy sugarcane bagasse were selected to determine their structure,physicochemical properties,fermentation process parameters,and substance removal rate.The results showed that the structure of moldy sugarcane bagasse was destroyed,and there were more attachments and microorganisms on its surface.Compared with normal sugercane bagasse,the moisture content of moldy sugarcane bagasse increased by 44.6%,the soluble sugar content decreased by 95.4%,the total nitrogen content increased by 48.6%,and the lignocellulose content increased.During the anaerobic fermentation process,the maximum value of soluble chemical oxygen demand(3229.0 mg/L)of normal sugarcane bagasse was 3.4 times that of moldy sugarcane bagasse,and the maximum value of Total Volatile Fatty Acids(TVFA)of normal sugarcane bagasse was 1855.8 mg/L,which was 26.2%higher than that of moldy sugarcane bagasse.In addition,the Total Solids(TS)removal rate of moldy sugarcane bagasse was 17.2%lower than that of normal sugarcane bagasse.The Volatile Solids(VS)removal rate of moldy sugarcane bagasse was only 56.7%of that of normal sugarcane bagasse.The cumulative biogas production and methane production of moldy sugarcane bagasse were reduced by 60.6%and 77.9%,respectively,compared with normal sugarcane bagasse.In summary,the structure of sugarcane bagasse is destroyed after moldy transformation,and the soluble sugar content decreases sharply,greatly reducing the potential for biogas production.