改良氧化沟运行效果

The Operation Efficiency Research on the Improved Oxidation Ditch

改良氧化沟采用纵轴曝气装置,改变了氧化沟内氧气的溶解方式,比起普通的曝气装置可以大幅度地减少空气需求量。为了研究改良氧化沟的运行效果,选取水力停留时间、曝气量、纵轴转速3个影响因素进行实验分析,以COD和NH_3-N的去除效率为考核指标。选用3因素3水平正交实验表对运行结果进行对比寻找改良氧化沟的最佳实验条件,得出实验结果为COD去除效率最佳实验条件为:水力停留时间为20 h,曝气量为2.5 m^3/h,纵轴转速为1000 r/min;NH_3-N去除效率最佳实验条件为:水力停留时间为20 h,曝气量为2.5 m^3/h,纵轴转速为700 r/min。

The modified oxidation ditch adopts Draft Tube Aerator, changed the way oxidation ditch in dissolved oxygen, compared with ordinary aeration device can greatly reduce the air demand. In order to study the operation efficiency for the improved oxidation ditch, choose Hydraulic Retention Time（HRT）, aeration quantity and the vertical shaft speed to experiment analysis, use COD and NH_3-N removal efficiency for evaluation index. In order to Look for the best experimental conditions of improved oxidation ditch, the experiment was designed according to three factors and three levels orthogonal table. Get experimental results are： The best experimental conditions of COD removal efficiency is HRT=20 h, Aeration quantity=2.5 m^3/h,vertical shaft speed=1 000 r/min; The best experimental conditions of COD removal efficiency is HRT=20 h, Aeration quantity=2.5 m^3/h, vertical shaft speed=700 r/min.