CAS工艺与AOE工艺曝气池水质信息场的测量与分析

Field measurement and analysis of wastewater quality in aeration tanks of CAS and AOE process

为了研究曝气池空间内水质的分布及变化规律,采用了YSI6600 V2多参数水质检测仪对成都市三瓦窑污水处理厂的一期工程传统污泥法(CAS)、二期工程缺氧、好氧和内源呼吸(AOE)工艺中的曝气池分别进行了包括DO、NH3-N、NO3--N、pH、氯化物和温度等水质指标的场的检测,通过分析这些数据,揭示了曝气池内部水质变化的规律,并比较了CAS工艺与AOE工艺内水质处理效果的差别。结果表明,(1)溶解氧沿池深方向呈现出一定的分布规律,CAS工艺中随池深增加,溶解氧增加,AOE工艺中随着池深的增加,溶解氧降低;(2)AOE工艺对氨氮在O区的去除率可达97.64%,明显高于CAS工艺的41.76%;(3)沿曝气池长度测量溶解氧空间分布规律,参照理论曲线及依据水质处理要求,调整曝气量的方法具有长期运行经济、水质处理效果好的特点。

In order to study the distribution and variation characteristics of wastewater quality in aeration tanks,wastewater quality were measured and analyzed in field.Multi-parameter water quality testing instruments YSI6600V2 was employed in the CAS process of phase 1 project,and in the aeration tanks of AOE process of phase 2 project at Sanwayao Wastewater Treatment Plant.The measured parameters include DO,NH3-N,NO-3-N,pH,chloride compounds,and temperature.Wastewater quality changes within the aeration tank were given by analyzing these data,and a comparison between the CAS process and the AOE process was conducted.The results show that：（1） dissolved oxygen along the depth direction was shown to be a certain distribution characteristics,dissolved oxygen increases with the increase of the depth in CAS process.Dissolved oxygen decreases with the increase of depth in AOE process;（2） ammonia nitrogen removal rate in the O District is 97.64% in AOE,significantly higher than that of CAS process,which is 41.76%;（3） adjusting the discharge of oxygen in the longitudinal direction is an effective way of reducing energy consumption and guaranteeing water quality of effluent based on the measurement results of dissolved oxygen and theoretical demand curve of dissolved oxygen.