底物质量分数对混合蔬菜废弃物厌氧发酵的影响及动力学研究  

Effects and the kinetics of substrate mass fraction on anaerobic fermentation of mixed vegetable waste

作　　者：王菊华 陈玉保[1] 李睿帆 庄诗韵 张文杰 赵永超 WANG Juhua;CHEN Yubao;LI Ruifan;ZHUANG Shiyun;ZHANG Wenjie;ZHAO Yongchao(School of Energy and Environmental Science,Yunnan Normal University,Kunming 650500,China)

机构地区：[1]云南师范大学能源与环境科学学院

出　　处：《河南农业大学学报》2019年第6期934-940,共7页Journal of Henan Agricultural University

基　　金：国家自然科学基金项目(21266032);云南省基础研究计划重点项目(2019FA004);云南省外专引智项目计划(YN2019006)

摘　　要：为了探究底物质量分数对混合蔬菜废弃物厌氧发酵产沼气潜力的影响,采用批量式试验,在高温(55±1)℃下,研究底物质量分数为2%、3%、4%、5%和6%时,混合蔬菜废弃物厌氧发酵总固体含量(total solid,TS)和挥发性固体含量(volatile solid,VS)降解率、挥发性脂肪酸(volatile fatty acid,VFA)质量浓度、甲烷含量、日产沼气量、发酵前后累积产沼气总量及产沼气潜力的变化,并通过修正的Gompertz模型进行动力学研究。结果表明,底物质量分数为3%时,混合蔬菜废弃物的TS降解率为42.25%,VS降解率为56.35%,VFA质量浓度为241.43 mg·L-1,甲烷含量为64.5%,日产沼气量最高为210 mL,累积产沼气总量为2070 mL,产沼气潜力为324.94 mL·g-1,甲烷含量为64.5%,均普遍优于其他试验组。利用修正的Gompertz模型模拟混合蔬菜废弃物厌氧发酵产沼气的累积产沼气过程,当底物质量分数为3%时,拟合获得的最大产沼气量和最大产沼气速率最高,分别为2438.37 mL和134.09 mL·d-1。In order to explore the effects of substrate mass fraction on biogas production potential by anaerobic fermentation of mixed vegetable waste,the experiment was carried out in batch mode at high temperature(55±1℃).The substrate mass fractions of 2%,3%,4%,5%,and 6%were employed to investigate the effects of substrate mass fraction on the total solid content(TS)and volatile solid(VS)degradation rates.Volatile fatty acid(VFA)mass concentration,methane content,daily biogas production,total cumulative biogas production before and after fermentation were also investigated.The kinetics of the effect was studied by the modified Gompertz model.A modified Gompertz model was used to simulate the cumulative biogas production process of anaerobic fermentation of mixed vegetable waste.The results showed that 3%substrate mass fraction was generally superior to other groups.The TS degradation rate of mixed vegetable waste was 42.25%,the VS degradation rate was 56.35%,the VFA mass concentration was 241.43 mg·L-1,the methane content was 64.5%,the maximum daily biogas yield was 210 mL,the total cumulative biogas production was 2070 mL,the biogas production potential was 324.94 mg·L-1,and the methane content was 64.5%.The fitting results from the modified Gompertz model showed that,under the substrate mass fraction of 3%,the maximum total cumulative biogas yield and maximum biogas production potential could obtain the highest value of 2438.37 mL and 134.09 mL·d-1,respectively.

关 键 词：蔬菜废弃物 厌氧发酵 Gompertz模型 沼气 甲烷 

分 类 号：S216[农业科学—农业机械化工程]