A^2/O工艺内回流中溶解氧对反硝化的影响  

Influence of DO in Internal Reflux of A^2/O Process on Denitrification

作　　者：李培[1] 潘杨[1] 

机构地区：[1]苏州科技学院环境科学与工程学院,江苏苏州215011

出　　处：《环境科学与技术》2012年第1期103-106,共4页Environmental Science & Technology

基　　金："十一五"国家重大科技专项子课题(2008ZX07313-002-02)

摘　　要：溶解氧对微生物的生长影响很大,对A2/O工艺实际工程中缺氧反硝化、内回流中溶解氧对反硝化的影响进行分析,结果表明,在现行运行条件下,缺氧池反硝化不彻底,内回流液中溶解氧含量过高,是影响缺氧池反硝化的主要因子。硝化液回流中溶解氧在缺氧池去除的碳源量均值为137 kg/d,占到反硝化理论与实际消耗碳源差值量的69%。建议设置非曝气区,经过理论计算,可节约碳源0.58~3.46 mg/L,使缺氧池出水硝酸盐氮浓度降低0.1~0.73 mg/L。这不仅提高了脱氮的效率,还可以降低能耗。建议实施溶解氧自动控制,以减少能量消耗并提高脱氮效果。Dissolved oxygen（DO） plays an important role in microorganism growth and affects removals of nitrogen and phosphorus in a wastewater treatment plant with A2/O process.A systemic monitoring was conducted at a city＇s WWTP,investigating the impact of concentration of DO on de-nitrification in the anoxic zone of the A2/O process.It was found that the drawbacks in the anoxic zone impaired de-nitrification,i.e.,DO concentration was too high in the internal reflux,and in addition,carbon source was consumed too much.Based on the investigation,a non-aeration section was suggested to be set up in the present oxic zone in order to promote de-nitrification,which could save carbon source and energy consumption.

关 键 词：A-A2/O工艺 溶解氧 反硝化 脱氮优化 非曝气区 

分 类 号：X751[环境科学与工程—环境工程]