自制微电极分析活性污泥中的硝化反应研究  

Study of Nitrification of Activated Sludge Analyzed with Home-made Microelectrode

作　　者：王旭东[1] 李志霞[2] 王磊[1] 王韬[1] 孟千秋[1] 

机构地区：[1]西安建筑科技大学环境与市政工程学院,陕西西安710055 [2]上海宝钢工程技术有限公司,上海201900

出　　处：《中国给水排水》2010年第21期21-24,29,共5页China Water & Wastewater

基　　金：国家水体污染控制与治理科技重大专项(2009ZX07212-002);陕西省教育厅专项基金资助项目(09JK543);西安市科技计划项目[CXY09025(4)]

摘　　要：采用微电极考察了SBR系统活性污泥微环境中的硝化反应。结果表明:当活性污泥絮体中的DO为1.95 mg/L时,絮体处于好氧状态,仅发生硝化反应,氨氮转化为硝态氮的比率较高;而当DO为0.24 mg/L时硝化反应受到抑制,氨氮转化为硝态氮的比率降低。另外,当进水NH4+-N为6.5 mg/L时硝化反应进行得较完全;当进水NH4+-N为13 mg/L时硝化反应进行得不完全,去除的氨氮中只有40%转化为硝态氮。借助微电极能从微观角度验证SBR反应器内发生的硝化反应,量化絮体内部DO、NO3-、NO2-和NH4+浓度的变化,因而将其作为微观测定工具应用于SBR系统是可行的。Nitrification in micro-environment of SBR system was investigated with microelectrode. The results show that when DO in activated sludge floc is 1.95 mg/L, aerobic environment can be obtained, and only nitrification is observed with high transformation rate from ammonia nitrogen to nitrate nitrogen. However, when DO is 0.24 mg/L, nitrification is inhibited, and the transformation rate from ammonia nitrogen to nitrate nitrogen is decreased. The complete nitrification occurs when the influent am- monia nitrogen is 6.5 mg/L, while the incomplete nitrification occurs when the influent ammonia nitrogen is 13 mg/L. About 40% of removed ammonia nitrogen is transformed into nitrate nitrogen. Microelectrode can verify the nitrification in SBR reactor from the microscopic viewpoint and quantify the concentrations of DO, NO3^- , NO2^- and NH4^＋ in the floc, so it is feasible to be considered as a tool used for SBR system.

关 键 词：微电极 活性污泥 硝化 

分 类 号：X703[环境科学与工程—环境工程]