回流比对单级UASB-A/O处理晚期垃圾渗滤液短程脱氮的影响  

Effect of recycling ratio on shortcut nitrification-denitrification of mature landfill leachate in a single-stage UASB-A/O system

作　　者：刘牡[1] 彭永臻[1] 宋燕杰[1] 吴莉娜[1] 赵艳琳[1] 

机构地区：[1]北京工业大学北京市水质科学与水环境恢复工程重点实验室,北京100124

出　　处：《化工学报》2011年第6期1675-1681,共7页CIESC Journal

基　　金：国家自然科学基金项目(50778005);北京市自然科学基金重点项目(8091001);北京市教委科技创新平台项目(PXM2008_014204_050843)~~

摘　　要：采用＂单级UASB-A/O组合工艺＂处理实际晚期高氨氮城市生活垃圾渗滤液,在获得稳定的有机物与氮同步去除的前提下,重点考察了不同回流比条件下（100%~600%）,UASB与A/O中的污泥分布、DO浓度,UASB中同时反硝化与产甲烷的活性,A/O中亚硝酸积累率的变化,组合工艺系统氮与有机物的转化与去除。结果表明,当回流比维持在适当的范围内时：各反应器的污泥分布与DO浓度处于较佳状态;产气量的分析显示UASB中反硝化菌与产甲烷菌活性维持动态平衡;在保证硝化效率的前提下,A/O中的FA通过对氨氧化菌和亚硝酸盐氧化菌的选择性抑制实现对硝化反应速率的控制从而维持较高的亚硝酸积累率。根据原液水质特性,综合能耗的考虑,将回流比控制在300%左右能够使系统性能处于较优状态,NH＋4-N去除率,NO-2-N积累率,TN去除率,COD去除率分别可达到99.3%,94.4%,85.9%和90.6%。A combined system consisting of an up-flow anaerobic sludge blanket（UASB）and anoxic/oxic bioreactor was adopted for treating mature municipal landfill leachate rich in ammonia nitrogen（NH＋4-N）.On the premise of the COD and nitrogen being removed simultaneously,the sludge distribution and DO concentration in UASB and A/O,denitrification and methanogenic activity in UASB,nitrite accumulation ratio variation in A/O,organic matter and nitrogen transition behavior in the combined system were analyzed at different recycling ratios（100%—600%）.The results with the recycling ratio maintained at an appropriate level indicated that the sludge distribution characteristics and DO concentration in respective reactors were in a relatively better state.Gas production analysis showed that denitrifying bacteria and methanogen activity in UASB were maintained at homeostasis balance.Under the premise of ensuring the efficiency of nitrification,the selective inhibition of FA on ammonia oxidizing bacteria and nitrite oxidizing bacteria realizing control on nitrification rate to achieve a high rate of nitrite accumulation in A/O.According to the characteristics of liquid water and considering energy consumption,an optimal recycling ratio of 300% was suggested to achieve optimum system performance with the removal efficiencies of NH＋4-N,TN,COD reaching 99.3%,85.9% and 90.6% respectively and NO-2-N accumulation ratio reaching 94.4%.

关 键 词：回流比 渗滤液 产甲烷 短程反硝化 亚硝酸积累率 

分 类 号：X703.1[环境科学与工程—环境工程]