好氧池DO分级对改良A^2O工艺的影响研究  

Impact of Different DO Combinations in Two Stage Aerobic Ponds on an Improved A^2O Process

作　　者：孙绍锋 刘畅 李镭 杜江 汪文鹏 

机构地区：[1]环境保护部固体废物与化学品管理技术中心 [2]武汉市环境保护科学研究院,湖北武汉430015 [3]湖北省环境监测中心站,湖北武汉430072

出　　处：《环境科学与技术》2013年第12期50-53,共4页Environmental Science & Technology

基　　金：国家科技支撑计划课题(2012BAJ21B06);武汉市科技攻关计划项目(201260723227)

摘　　要：分级设置改良A2O工艺中两级好氧池的溶解氧(DO),并对工艺脱氮、除磷能力进行了研究。当两级好氧池DO浓度均保持在约2.0 mg/L时,TN去除率为51.7%、TP去除率为75.6%,COD去除率为77.3%。适当降低好氧池1的DO浓度至约1.0 mg/L、好氧池2的DO浓度约2.0 mg/L时,脱氮除磷能力均增强,分别达到56.3%和77.5%,COD去除率77.5%。既提高了工艺对氮磷及有机污染物的去除效率,同时也降低了工艺运行时的曝气强度。保持好氧池1的DO浓度约1.0 mg/L、进一步升高好氧池2的DO浓度至约3.0 mg/L时,TN去除率降至42.2%、TP去除率进一步升高至82.1%,COD去除率也有所升高,达到80.4%。因此,两级好氧池DO梯度设置还可作为应对不同进水水质时,调节改良A2O工艺脱氮或除磷侧重能力的一种手段。With the control of dissolved oxygen （DO） of the two stage aerobic ponds in an improved A20 process, the nitrogen and phosphorus removal efficiency for the process was studied. When both of the DO in the two stage aerobic ponds was about 2.0 mg/L, the removal efficiency for TN,TP and COD was 51.7%, 75.6% and 77.3% respectively. Reducing DO in aerobic tank 1 to about 1.0 mg/L while keeping DO in aerobic tank 2 still about 2.0 mg/L,the nitrogen,phosphorus and organic pollutants removal efficiencies of the process were all enhanced up to 56.3%, 77.5% and 77.5% respectively, which also decreased the aeration intensity needed for keeping process running. Moreover,the DO in aerobic tank 2 was increased to about 3.0 mg/L while the DO in aerobic tank 1 was kept about 1.0 mg/L, removal efficiency for TN decreased to 42.2%. However,TP and COD removal efficiency further increased to 82.1% and 80.4%. Consequently,gradient settings for DO in the two stage aerobic ponds, as a kind of means, can be also utilized to make the improved A2 O process emphasizing on denitrification or dephosphorization to respond to different inflow water quality.

关 键 词：改良A2O工艺 DO 脱氮 除磷 物料衡算 

分 类 号：X703.1[环境科学与工程—环境工程]