水稻秸秆序批式干发酵产沼气中试及其动力学研究  

Pilot plant test of biogas production by rice straw sequencing batch dry anaerobic digestion and its kinetic analysis

作　　者：刘杨[1,2,3] 闫志英 姬高升[1,2] 许力山 房俊楠 曾勇[1,2] 宦臣臣 佟欣宇 Liu Yang;Yan Zhiying;Ji Gaosheng;Xu Lishan;Fang Junnan;Zeng Yong;Huan Chenchen;Tong Xinyu(Key Laboratory of Environmental and Applied Microbiology,Chinese Academy of Sciences,Chengdu 610041,China;Key Laboratory of Environmental Microbiology,Sichuan Province,Chengdu 610041,China;University of Chinese Academy of Sciences,Beijing,100049,China)

机构地区：[1]中国科学院环境与应用微生物重点实验室,成都610041 [2]环境微生物四川省重点实验室,成都610041 [3]中国科学院大学,北京100049

出　　处：《农业工程学报》2018年第23期221-226,共6页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家重点研发计划(2017YFD0800803-02);环境微生物四川省重点实验室开放基金(KLCAS-2017-6)

摘　　要：干发酵处理有机废弃物或生物质废弃物等具有处理量大,用水量少,处理周期短等优势。该试验以水稻秸秆为原料(269 kg,TS为89.19%±0.24%),用沼液(500 kg)调节水稻秸秆含水率至67.58%,覆膜堆沤3 d,并以运行良好沼气池污泥为接种物(300 kg,接种量为28.06%,TS为1.88±0.07%),室温(30~35℃)条件下进行周期为55 d的干发酵中试试验。试验结果表明:反应55 d后,秸秆累积产气量为308.20 m3/t,累积产甲烷量为167.44 m3/t,最高甲烷体积分数达57.88%,最大日产气量为2.33 m3。通过Gompertz模型对水稻秸秆产甲烷曲线进行拟合,拟合出的产甲烷潜力值和实际的产甲烷潜力值很接近,R2为0.990 7,显示出较高的准确性。该研究可为序批式干发酵法处理水稻秸秆提供理论依据和指导。The organic waste can be converted by anaerobic digestion into a clean energy source of methane under gentle conditions.Dry anaerobic digestion,one kind of anaerobic digestion,was often used to treat municipal waste and had achieved great results for decades in Europe and America.The dry anaerobic digestion of biogas production technology is a better way than wet fermentation to handle rice straw.It has lots of advantages,such as bigger processing capacity,simpler device,lower energy loss and water consumption.However,dry fermentation of straw is very easy to fail due to heterogeneity of substrate,acid inhibition,etc.There were a few researches on the key technology in exploring the AD efficiency of rice straw based agricultural waste.Therefore,this paper studied the biogas production characteristics of pilot-scale dry anaerobic digestion using rice straw as feedstock.The parameters were determined by the laboratory pre-experiment,rice straw was stacked on the field for 3 days with moisture of 67.58%adjusted by 500 kg biogas slurry,rice straw pretreated(269 kg,TS of 89.19%)was mixed with inoculums(300 kg,28.06%).The pilot-scale dry anaerobic digestion was conducted under the conditions of constant temperature at 30-35℃for 55 days.The result of the pilot-scale experiment showed that the biogas yield of rice straw was 308.20 m^3/t,the methane yield of rice straw was 167.44 m^3/t,the maximum methane content reached 57.88%after 55 days of dry anaerobic digestion.According to the results of biogas production,the pilot-scale experiment had excellent daily biogas production and higher methane concentration,and the whole process ran stably.The modified Gompertz equation was commonly used to perform kinetic analysis of anaerobic digestion,so the Gompertz model was used to fit the methane production curve of rice straw.The fitted methanogenic potential value was quite close to the actual methanogenic potential value,and R^2 value is 0.990 7,which indicated that the Gompertz model was also suitable for fitting the methane

关 键 词：秸秆 沼气 动力学 干发酵 降解 

分 类 号：X705[环境科学与工程—环境工程]