污水处理厂溶解氧自动控制系统的运行优化  

Operation Optimization of Dissolved Oxygen Automatic Control System in Wastewater Treatment Plant

作　　者：马金峰[1] 王佳伟[1] 张胜海[1] 甘一萍[1] 刘立超[1] 

机构地区：[1]北京城市排水集团有限责任公司,北京100022

出　　处：《中国给水排水》2010年第11期17-20,共4页China Water & Wastewater

基　　金：国家科技支撑计划项目(2006BAC19B01)

摘　　要：生化反应池曝气量的自动调节是污水厂节能降耗的重要手段。介绍了广州市西朗污水处理厂溶解氧自动控制系统的运行优化经验，指出控制鼓风机出口压力解决喘振现象是实现溶解氧自动控制的必要前提。研究了基于压力控制的鼓风机喘振控制方法和基于PID调节的溶解氧控制方法，得到了PID控制器的主要参数设定值：比例增益、微分增益、积分动作时间、响应临界值分别为1．0、5．0、200ms、10％。运行表明，鼓风机的出口压力稳定在0．070～0．073MPa，好氧一段和好氧二段的溶解氧分别控制在（1．2±0．3）mg／L和（1．0±0．3）mg／L，有效避免了鼓风机的喘振，实现了对溶解氧的稳定控制。提出并试验了基于出水氨氮控制的低溶解氧运行策略，好氧一段和好氧二段的溶解氧设定值分别为0．7～1．3mg／L和0．7～1．9mg／L，与传统的溶解氧控制值（2～3mg／L）相比节能效果较为明显。The automatic regulation of aeration rate in biochemical tank is an important means for energy saving and consumption reduction in WWTP. The experience in operation optimization of dissolved oxygen automatic control system in Guangzhou Xilang WWTP was introduced. Solving the surging phenomenon of blower by controlling outlet pressure was emphasized as a prerequisite to achieve automatic control of dissolved oxygen. Tests on blower surge control based on pressure control and dissolved oxygen stability control by PID adjustment were carried out. The main setting parameters for PID controller were obtained, including proportional gain of 1.0, differential gain of 5.0, integral response time of 200 ms and critical response value of 10%. The operation results show that when the blower outlet pressure stabilizes at 0. 070 to 0. 073 MPa, and the dissolved oxygen in the first and second aerobic zones is controlled at （ 1.2 ± 0.3 ） mg/L and （ 1.0 ± 0.3 ） mg/L respectively, the blower surge can be effectively avoided, and the stable control of dissolved oxygen can be achieved. An operation strategy on low dissolved oxygen control based on ammonia nitrogen in the end of aerobic zone was proposed. The dissolved oxygen in the first and second aerobic zones is controlled at a range of 0.7 to 1.3 mg/L and 0.7 to 1.9 mg/L, and more energy is saved compared with the traditional dissolved oxygen control value of 2 to 3 mg/L.

关 键 词：污水处理厂 溶解氧 自动控制 鼓风机 氨氮 

分 类 号：X703[环境科学与工程—环境工程]