低DO浓度下氧化沟的除污及节能效果分析  

Effect of Low DO in Pilot-scale Oxidation Ditch on Pollutant Removal and Energy Saving

作　　者：王社平[1,2] 李磊[1] 杨亚红[1] 郑阳光[1] 张雅静[1] 张欣蓓[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]西安市政设计研究院有限公司,陕西西安710068

出　　处：《中国给水排水》2012年第21期5-8,共4页China Water & Wastewater

基　　金：国家水体污染控制与治理科技重大专项(2009ZX07317-009)

摘　　要：以实际污水处理厂的沉砂池出水为研究对象,在微孔曝气氧化沟中试装置中进行了低溶解氧浓度和污泥微膨胀条件下去除污染物的试验并分析了节能效果。通过电动阀控制曝气量,使曝气区的DO维持在0.5～0.9 mg/L之间,SVI值为150～250 mL/g,即污泥处于丝状菌微膨胀状态,可以节省曝气量约50%,且对COD、NH3-N、TN和TP的平均去除率分别达到92.5%、99.1%、82.1%和96.2%,出水SS平均值小于10 mg/L,满足《城镇污水处理厂污染物排放标准》中一级A的要求,实现了低溶解氧浓度和污泥微膨胀状态下的运行与高效脱氮除磷。The actual effluent from grit chamber of a wastewater treatment plant was used to investigate the pollutant removal efficiency and energy saving effect in a pilot-scale microporous aeration oxidation ditch under conditions of low DO and limited filamentous sludge bulking. The DO concentration was maintained between 0.5 mg/L and 0.9 rag/L, and SVI value ranged between 150 mL/g to 250 mL/g, which could cause limited filamentous sludge bulking and aeration reduction of 50%. The average removal rates of COD, NH3 - N, TN and TP were 92.5%, 99.1%, 82.1% and 96.2% respectively. The effluent SS was less than 10 mg/L. The effluent quality met the first level A criteria specified in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant （ GB 18918 - 2002）.

关 键 词：污水处理厂 氧化沟 低溶解氧 污泥微膨胀 节能效果 

分 类 号：X703[环境科学与工程—环境工程]