甲烷化出水循环量对固体废物厌氧水解的影响  

Impact of Liquid Volume of Recycled Methanogenic Effluent on Anaerobic Hydrolysis

作　　者：郝丽萍[1] 吕凡[1] 何品晶[1] 邵立明[1] 

机构地区：[1]同济大学环境科学与工程学院,污染控制与资源化研究国家重点实验室,长江水环境教育部重点实验室,上海200092

出　　处：《环境科学》2008年第9期2637-2642,共6页Environmental Science

基　　金：国家自然科学基金项目(50708069);教育部科学技术研究重点项目(107122);高等学校博士学科点专项科研基金项目(20070247009);上海-法国罗纳阿尔卑斯大区科研合作基金项目(06SR07105)

摘　　要：在蔬菜花卉类废物的两相厌氧消化过程中,利用甲烷化出水循环至水解反应器调控厌氧水解过程,以加速固相有机物的水解.比较甲烷化出水循环量分别为0.1、0.5、1.0、2.0 m3/(m3.d)时,水解环境(pH、碱度、ORP、氨氮浓度、还原糖浓度)、水解微生物量和水解效率(SCOD和还原糖的累计溶出量、水解速率常数)的变化,探讨了循环量对水解过程的影响.结果表明,甲烷化出水循环增强了水解环境的缓冲能力和稳定性,高循环量有利于微生物的合成代谢和生物量的增加,水解效率随循环量的增加而升高.该工艺运行9 d后,循环量为0.1、0.5、1.0、2.0 m3/(m3.d)时,水解液的SCOD(以VS计)累计溶出量分别达到334、407、413、581 mg/g,相应的一级动力学水解速率常数分别为0.065、0.083、0.089、0.105 d-1.Methanogenic effluent was recycled to regulate hydrolysis during two-phase anaerobic digestion of organic solid wastes, In order to study the impact of recycled effluent＇s volume on hydrolysis, four hydrolysis reactors filled with vegetable and flower wastes were constructed, with different liquid volumes of recycled methanogenic effluent, i.e., 0.1, 0.5, 1.0, 2.0 m^3/（m^3·d）, respectively. The parameters related to hydrolytic environment （pH, alkalinity, ORP, concentrations of ammonia and reducing sugar）, microbial biomass and hydrolysis efficiency （accumulated SCOD, accumulated reducing sugar, and hydrolysis rate constants） were monitored. This research shows that recycling methanogenic effluent into the hydrolysis reactor can enhance its buffer capability and operation stability; higher recycled volume is favorable for microbial anabolism and further promotes hydrolysis. After 9 days of reaction, the accumulated SCOD in the hydrolytic effluent reach 334, 407, 413, 581 mg/g at recycled volumes of 0.1, 0.5, 1.0, 2.0 m^3/（m^3 ·d） and their first-order hydrolysis rate kinetic constants are 0.065, 0.083, 0.089, 0.105 d^-1, respectively.

关 键 词：蔬菜花卉类废物 两相厌氧消化 水解 甲烷化 循环量 微生物量 

分 类 号：X705[环境科学与工程—环境工程]