曝气方式对氧化沟工艺脱氮效果的影响  

Influence of Different Aeration Modes on Nitrogen Removal in Oxidation Ditch

作　　者：郭昌梓[1,2] 彭党聪[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]陕西科技大学资源与环境学院,陕西西安710021

出　　处：《中国给水排水》2011年第21期8-10,14,共4页China Water & Wastewater

摘　　要：采用混合反应器模拟氧化沟运行的方式,探讨曝气方式对其脱氮效果的影响。结果表明:分点曝气的溶氧效率高,好氧区长,而分段曝气的氧有效利用(用于硝化)率高,两者的硝化率相当,但采用分点曝气时好氧区的整体DO水平偏低,其硝化菌活性不如分段曝气的,两者的硝化菌活性分别为4.55和4.89 mgNH4+-N/(gMLVSS.h)。两种方式下对有机物的去除效果相当,去除率分别为91.01%和92.19%,出水COD皆在30 mg/L以下,但在分段曝气中有机物主要用于反硝化脱氮,反硝化效率高,而在分点曝气方式下只有一小部分有机物用于反硝化,脱氮率低,出水硝态氮浓度高。分点曝气的污泥沉降性能较好,但运行稳定性不如分段曝气系统,好氧区与缺氧区的比例受进水水质的影响较大,从而影响处理效果。The operation mode of oxidation ditch was simulated in the completely mixed reactor, and the influence of different aeration modes on nitrogen removal was explored. The results show that the oxygen is dissolved more efficiently with longer aerobic region during the point aeration. But the oxygen utilization rate is high during the step aeration. The rate of nitrification is equal in the two aeration modes. The whole level of DO and the denitrifying bacteria activity during the point aeration are lower than those during the step aeration. The nitrifying bacteria activities in the two aeration modes are 4.55 mgNH4 -N/（gMLVSS · h） and 4. 89 rngNH4＋ -N/（gMLVSS · h） respectively. The two aeration modes have the same organic removal efficiencies, being 91.01% and 92.19% , and the effluent COD is all under 30 mg/L. Organic is mainly used for denitrification with a high efficiency during the step aera- tion while only a small fraction of organic is utilized for denitrification during the point aeration in which the nitrogen removal rate is low, and the concentration of nitrate nitrogen in the effluent is high. The sludge settleability is better during the point aeration, but the operation stability is lower than that during the step aeration. The ratio of aerobic and anoxie areas is greatly influenced by the influent, which affects the treatment effect.

关 键 词：氧化沟 分点曝气 分段曝气 脱氮 

分 类 号：X703[环境科学与工程—环境工程]