餐厨垃圾干发酵水解酸化机制及产气动力学  

Mechanism of hydrolytic acidification and kinetics of biogas production study for kitchen waste dry anaerobic digestion

作　　者：冯磊[1] 高媛[1] 寇宏丽 李润东[1] 

机构地区：[1]沈阳航空航天大学能源与环境学院,辽宁省清洁能源联合重点实验室,辽宁沈阳110136

出　　处：《环境污染与防治》2016年第9期62-67,共6页Environmental Pollution & Control

基　　金：国家科技支撑计划项目(No.2012BAC25B07)

摘　　要：分析了餐厨垃圾干发酵的启动、运行、失衡、恢复及稳定运行全过程中各参数的变化趋势,重点研究了产气特性与挥发性脂肪酸（VFAs）各成分、总固体（TS）浓度等的关系,并讨论水解酸化机制及产气动力学。结果表明：餐厨垃圾干发酵过程可划分为适应性阶段（0-13d）、启动阶段（14-34d）、抑制阶段（35-72d）和恢复及稳定阶段（73-120d）,在恢复及稳定阶段以NaOH稀碱液调节当日回流渗滤液的pH,在72d时pH上升至7.4,产气量明显提高;在98d后TS维持在23%（质量分数）以上,系统日产气量和生物降解率均相对稳定。根据累积产气量数量关系把餐厨垃圾干发酵反应期分为二次函数产气阶段（1-30d）、幂函数产气阶段（31-65d）和线性产气阶段（66-120d）。建立整个实验周期产气率模型,3阶段R2分别为0.987 2、0.952 1、0.999 1,其与实验数据有较好的吻合度。Kitchen waste dry anaerobic digestion（AD） experiments were conducted to study changes of various monitoring indicators in the entire kitchen waste dry AD process of start, operation, imbalance and stabilization. The inhibition that affect dry AD system operation,as well as final stable operation were analyzed, which focused on rela-tionship between biogas production characteristics, composition of VFAs and TS concentration. Kinetics of biogas production was explored. The kitchen waste dry AD experiment process could be straightforwardly divided into four stages,namely adaptation phase （0-13 d） ,start-up phase （14-34 d） ,inhibition phase （35-72 d） and recovery and stabilization phase （73-120 d）. When NaOH was used to adjust the pH of reflux leachate of the day？the pH on 72 d rose to 7.4,and the gas production was significantly increased. The TS remained above 23% （mass fraction） after 98 d. The daily production of the system and the rate of biodegradation were kept relatively steady. Reaction period of kitchen waste dry AD could be divided into three stages： quadratic model stage （1-30 d） , power function stage （31-65 d） and linear model stage （66-120 d） according to the quantitative relation of the accumulative gas production. The gas pro-duction rate model withi？2 of 0.987 2,0.952 1 and 0.999 1 during the three stages was set up during the whole experi-mental period, which had well alignment with the experimental data.

关 键 词：餐厨垃圾 干发酵 水解酸化 机制 产气 动力学 

分 类 号：X705[环境科学与工程—环境工程]