生物强化菌系添加量对不同食微比餐厨垃圾厌氧发酵性能影响  

Effect of Bioaugmentation on Anaerobic Digestion of Food Waste at Different Food to Micro Ratios

作　　者：胡致远 张新杰 王宇 李颖[1,2,3] 孙永明[1,2,3] HU Zhi-yuan;ZHANG Xin-jie;WANG Yu;LI Ying;SUN Yong-ming(Guangzhou Institute of Energy Conversion,Chinese Academy of Sciences,Guangzhou 510640,China;CAS Key Laboratory of Renewable Energy,Guangzhou 510640,China;Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development,Guangzhou 510640,China;College of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Daqing City Inspection and Testing Center,Daqing 163000,Heilongjiang,China)

机构地区：[1]中国科学院广州能源研究所,广州510640 [2]中国科学院可再生能源重点实验室,广州510640 [3]广东省新能源和可再生能源研究开发与应用重点实验室,广州510640 [4]兰州理工大学能源与动力工程学院,兰州730050 [5]大庆市检验检测中心,黑龙江大庆163000

出　　处：《新能源进展》2021年第6期489-495,共7页Advances in New and Renewable Energy

基　　金：国家自然科学基金面上项目(52170143)。

摘　　要：为考察生物强化菌系添加剂量对餐厨垃圾厌氧发酵性能影响,确定不同食微比(F/M)下最佳菌剂添加量,进行了批式厌氧发酵实验。以实验室已获得的丙酸产甲烷菌系为生物强化菌系,对不同F/M(0.5、1.0、2.0)进行生物强化,菌剂添加量设置为5%、10%、15%、25%、35%比,通过产气性能及中间代谢产物的对比,结合产甲烷动力学评价生物强化效果。结果表明:各剂量的生物强化均可促进餐厨垃圾产气,提高累积产甲烷率1~3倍;各F/M下,累积产甲烷率均随生物强化剂量增加而增大,35%的添加量产气效果最佳。就生物强化效率而言,3组F/M发酵中,F/M为1.0且菌系添加量为15%时,单位质量菌剂获得最大甲烷提升效率(1706 mL/gVS_(菌剂));中间代谢产物分析显示,生物强化可促进丙酸和乙酸的降解,避免酸抑制,从而提高产甲烷能力。修正Gompertz模型对产甲烷潜力动力学分析表明,生物强化可以缩短不同食微比下的发酵延滞期,加快反应进程。This study aimed to investigate effect of bioaugmentation on anaerobic digestion of food waste and achieve optimum dosage of bioaugmentation inoculum under various of ratios of VS from the inoculum and VS of the substrate(ISR).Thus,methanogenic propionate-utilizing consortia,as the bioaugmentation inoculum,were introduced into batch anaerobic digestion reactors with different ISR(i.e.,0.5,1.0,and 2.0),and the dosages of inoculum was set at 0%,5%,10%,15%,25%,and 35%(on the basis of VS),respectively.This study showed that bioaugmentation across all groups had varying degrees of positive effect on methane production rate,ranging from 1 to 3 times higher.Inoculum dosage showed the positive correlation with cumulative methane production rate,and groups with the dosage of 35%showed the best performance,which was applied to all groups with different ISR.Besides,amongst all groups,the group with inoculum dosage of 15%and ISR of 1 achieved the highest bioaugmentation efficiency of 1706 mL/g VS_((bioaugmentation inoculum)).As evidenced by intermediate metabolites analysis,the addition of bioaugmentation inoculum significantly alleviated acid inhibition through accelerating biodegradation process of derived propionic acid and acetic acid and then recovered methane yields from acid inhibition.Focusing on kinetics of methane production by modified Gompertz model,the results indicated that the addition of bioaugmentation inoculum could shorten the lag phase and accelerate anaerobic digestion process across groups with different ISR.

关 键 词：餐厨垃圾 厌氧发酵 生物强化 丙酸产甲烷菌 

分 类 号：TK6[动力工程及工程热物理—生物能]