摘要
针对三峡库区污水厂广泛采用的氧化沟和CASS工艺在低碳源条件下脱氮效果不佳的问题,在实际污水处理厂进行生产性调控研究,促进同步硝化反硝化(SND)的发生,以节省碳源、提高脱氮效果。井口污水厂(改良型Carrousel氧化沟工艺)的调控结果表明:采用区段溶解氧控制,即将主反应区划分为不同生化反应功能区段,通过在线溶氧仪使各区段维持不同的溶解氧水平,可强化主反应区的SND脱氮作用,调控后的出水水质稳定达到《城镇污水处理厂污染物排放标准》(GB 18918—2002)的一级B标准,对TN的去除率较调控前提高了19%。万盛污水厂(CASS工艺)的调控结果表明:采用梯级溶解氧控制,即进水/曝气前1 h控制DO<1 mg/L、后1 h控制DO为2～3 mg/L,可促进微曝气阶段的SND脱氮作用,经调控后出水水质稳定达到一级B标准,对TN的去除率较原设计模式提高了约15%。
In order to improve the nitrogen removal efficiency of oxidation ditch and CASS proces- ses under low carbon, productive control studies were carried out in two MWWTPs in the Three Gorges reservoir region. Simultaneous nitrification and denitrification （SND） was achieved by productive control to reduce carbon source and improve nitrogen removal efficiency. In Jingkou MWWTP, which uses the modified Carrousel oxidation ditch process, sectional DO control strategy was used. The main reaction zone was divided into functional sections according to biochemical reactions, which were controlled by on- line DO meters to maintain different DO levels. The SND reaction in the main reaction zone was en-hanced, and the effluent quality met the first level B class criteria specified in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant （GB 18918 -2002）. The removal rate of TN was in- creased by 19% after the control. In Wansheng MWWTP using CASS process, the step DO control strate- gy was used, namely influent/aeration 2 h （DO below 1 mg/L during the first one hour and DO 2 to 3 mg/L during the second hour）. The SND reaction during the micro-aeration step （DO below 1 mg/L） was enhanced, and the effluent quality met the first level B class criteria specified in the Discharge Stand- ard of Pollutants for Municipal Wastewater Treatment Plant （ GB 18918 - 2002 ）. The removal rate of TN was increased by 15% compared with the original design.
出处
《中国给水排水》
CAS
CSCD
北大核心
2012年第11期1-5,共5页
China Water & Wastewater
基金
国家水体污染控制与治理科技重大专项(2009ZX07315-002-01)
关键词
三峡库区
城市污水处理厂
氧化沟
CASS
低碳源
脱氮
Three Gorges reservoir region
municipal wastewater treatment plant （MWWTP）
oxidation ditch
CASS
low carbon
nitrogen removal
