改良型A^(2)/O+A/O工艺的脱氮诊断和优化调控策略  

Diagnosis of Nitrogen Removal in Modified A^(2)/O+A/O Process and Its Optimization Strategy

作　　者：陈亚松 赵铮 CHEN Ya-song;ZHAO Zheng(Yangtze River Eco-Environmental Engineering Research Center,China Three Gorges Corporation,Beijing 100038,China;Three Gorges Ecological Environment Co.Ltd.,Yichang 443000,China)

机构地区：[1]中国长江三峡集团有限公司长江生态环境工程研究中心,北京100038 [2]三峡生态环境有限公司,湖北宜昌443000

出　　处：《中国给水排水》2022年第21期64-71,共8页China Water & Wastewater

摘　　要：针对污水处理厂日趋严格的总氮排放要求,以某综合污水处理厂A^(2)/O+A/O工艺为研究对象,开展了全过程的脱氮诊断分析。结果表明,缺氧区和前缺氧区是脱氮的主要区域,两者在不同月份的脱氮贡献占比分别为55.7%~60.8%、19.4%~28.5%;缺氧区的反硝化反应不稳定,其出水NO_(3)^(-)-N>1.6 mg/L的比例高达35.5%;后缺氧区对NO_(3)^(-)-N的去除率仅为13.9%。结合长期运行数据的诊断分析,建立了出水总氮的控制方程式,脱氮的关键控制因子为内外回流比、缺氧区出水NO_(3)^(-)-N浓度和后缺氧区对NO_(3)^(-)-N的去除量,通过工艺优化调控可实现该污水厂出水总氮<6 mg/L。In view of the increasingly stringent requirements of total nitrogen discharge in wastewater treatment plants,the nitrogen removal of an A^(2)/O+A/O process was diagnosed and analyzed in a comprehensive wastewater treatment plant.Anoxic zone and pre-anoxic zone were the main areas of nitrogen removal,which contributed 55.7%-60.8%and 19.4%-28.5%of the nitrogen removal respectively in different periods.Denitrification in the anoxic zone was unstable,and the effluent NO_(3)^(-)-N was greater than 1.6 mg/L with a frequency as high as 35.5%.The actual removal rate of NO_(3)^(-)-N in the post-anoxic zone was only 13.9%.A control equation for total nitrogen removal was established based on the diagnosis and analysis of long-term operational data.The key control factors affecting nitrogen removal were internal and external reflux ratio,effluent NO_(3)^(-)-N concentration of the anoxic zone and the removal amount of NO_(3)^(-)-N in the post-anoxic zone.The total nitrogen in effluent from the wastewater treatment plant could be less than 6 mg/L after process optimization.

关 键 词：A^(2)/O+A/O工艺 脱氮 优化调控 控制因子 污水处理厂 

分 类 号：TU992[建筑科学—市政工程]