摘要
在SBR反应器中利用游离氨(free ammonia,FA)、游离亚硝酸(free nitrous acid,FNA)对NOB(nitrite oxidizing bacteria,NOB)选择性抑制并耦合实时控制策略处理晚期垃圾渗滤液,成功实现持久稳定的短程生物脱氮,并研究了不同碳氮比及初始pH值对短程生物脱氮的影响。结果表明:通过FA和FNA对NOB的选择性抑制,在线检测反应中pH、DO和ORP数值,利用出现的"氨谷"、"ORP平台""亚硝酸盐膝"等特征点作为运行操作控制时间点,准确得知反应进程,及时开始下一步操作,获得稳定短程生物脱氮。进水NH4+-N浓度为108～177.3mg/L(平均值为138.7mg/L)时,亚硝积累率一直稳定达90%左右,乙酸钠为碳源时最佳C、N质量比为3,相对于混合液悬浮固体浓度的反硝化速率的平均值达到19.8mg·g-1·h-1 NOx--N,出水NH4+-N、NO2--N、NO3--N、TN分别小于6、2、1和30mg/L;初始pH值为8.5时,反硝化速率最大,pH介于7.5～8.5间,反硝化速率差异小于7.3%.
Stable short-cut nitrification was achieved through the selective inhibition of free ammonia （FA）, free nitrous acid （FNA） on the nitrifying bacteria and a real-time control strategy which used pH, DO and ORP as parameters in an SBR reactor. The effects of C/N ratio and initial pH value on the short-cut biological nitrogen removal were studied. It is found that： when influent NH4 ＋ --N concentration was 108- 177.3 mg/L, the nitrite accumulation rate was around 90%. The reasons for the favorable nitrite accumulation rate were both the inhibition of FA and FNA on the NOB and the real-time control strategy through detecting the ＂ammonia valley＂ and ＂nitrite knee＂ two feature points in pH and ORP profiles, respectively. The optimal C/N ratio was 3 when acetate was used as the carbon source. When the denitrification rate with respect to the concentration of mixed liquor suspended solids was 19.8 mg g-1 h-1 NOx--N, NH4 ＋ --N, NO2- --N, NO3--N, TN of the effluent were less than 6, 2, 1 and 30 mg/L, respectively. When initial pH value was 8.5, the denitrification rate was maximum. However the differences of denitrification rate were small when pH was in the range of 7.5-8.5.
出处
《土木建筑与环境工程》
CSCD
北大核心
2012年第6期126-132,共7页
Journal of Civil,Architectural & Environment Engineering
基金
国家自然科学基金资助项目(50978003)
北京市属高等学校人才强教计划资助项目
关键词
渗滤液
碳源
脱氮
实时控制
landfill leachate
carbon sources
nitrogen removal
real-time control
作者简介
彭永臻（1949-），男，教授，博士生导师，主要从事污水处理与过程控制、脱氮除磷研究，（E-mail）pyz@bjut．edu．cn。
