摘要
针对垃圾渗滤液中高浓度氨氮的问题,以间歇进水生物反应器为对象,研究了短程硝化反应中氨氮与COD降解动力学及功能微生物组成结构.结果表明:在pH=6.5~8.5时,氨氮降解符合米氏模型,而COD降解适用于抑制Aiba动力学模型.随pH增加,氨氮和COD的最大降解速率与饱和常数均先增加后降低,pH=7.5时达到最大值.这说明短程硝化反应中,氨氮与COD的降解受pH影响较大,最佳pH应该控制在7.5~8.0.此外,研究发现,短程硝化过程中COD的降解速率和最大降解速率分别是氨氮的5.6~11.3倍和12.4~16.8倍,这可能是由于实验进水中含有较高浓度的有机物,导致生物系统中异养菌生长代谢较快.最后,间歇进水生物反应器微生物中3种AOB菌群Nitrosomonas europaea ATCC19178、Nitrosomonas stercoris和Nitrosospira sp.PM2占总硝化菌群比例达66%,是短程硝化生物系统中的优势菌群.
The degradation kinetics of ammonia nitrogen and COD and the microbial communities in an intermittentflow shortcut nitrification reactor were investigated to remove ammonia and organic matters from landfill leachate.The results show that when pH = 6. 5-8. 5,the degradation of ammonia conforms to the Michaelis-Menten model while the COD degradation is suitable for Aiba kinetic model. With the increase of pH,the maximum degradation rate and saturation constants of ammonia and COD increase first and then decrease,reaching the maximum values when pH = 7. 5. The results indicate that the degradations of ammonia and COD are influenced by pH,and the optimum pH should be controlled between 7. 5 and 8. 0. In addition,the degradation rate and the maximum degradation rate of COD are 5. 6-11. 3 and 12. 4-16. 8 times higher than those of ammonia in the shortcut nitrification process,respectively. This may be because that the high concentration of organic matters in influent leads to the heterotrophic bacteria to grow faster than autotrophic bacteria in the biological system. Finally,the domain species of ammonia oxidizing bacteria（ AOB） in the reactor are Nitrosomonas europaea ATCC19178,Nitrosomonas stercoris and Nitrosospira sp. PM2,accounted for 66% together,indicating that the AOB was the predominant species for ammonia removal in this intermittent-flow shortcut nitrification reactor.
出处
《哈尔滨工业大学学报》
EI
CAS
CSCD
北大核心
2018年第2期65-70,共6页
Journal of Harbin Institute of Technology
基金
上海师范大学校级项目(SK201232)
关键词
垃圾渗滤液
短程硝化
动力学
降解
微生物菌群
landfill leachate
shortcut nitrification
kinetics
degradation
bacterial communities
