CAST工艺处理小城镇污水的运行模式优化研究  

Optimization of Operation Mode of CAST for Domestic Sewage Treatment in Small Towns

作　　者：王俊[1,2] 王琴 陈杰云[1] 罗明辉 

机构地区：[1]重庆大学三峡库区生态环境教育部重点实验室,重庆400045 [2]武汉市东西湖自来水公司,湖北武汉430040 [3]重庆市豪洋水务建设管理有限公司,重庆400020

出　　处：《中国给水排水》2011年第19期17-20,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(2009ZX07315-002-01)

摘　　要：小城镇污水具有水质、水量随季节变化较大的特点,从稳定达标和节能降耗两方面考虑都需要根据实际的水质和水量进行运行模式和参数的调整。针对万盛污水处理厂在常温运行期间进水污染物浓度和C/N值低、运行能耗偏高等问题,进行了一系列的运行模式优化研究。结果表明,采用循环周期为4 h的梯级非限制性曝气模式,即进水/曝气前1 h控制DO<1 m/L、后1h控制DO为2～3 mg/L、沉淀为1 h、滗水为1 h,可保证出水水质稳定达到《城镇污水处理厂污染物排放标准》(GB 18918—2002)中的一级B标准,并使对TN的去除效果较原设计模式提高了15%。在上述运行模式下,通过相应的曝气系统调整,使运行能耗降低了25%,从而实现了提升出水水质与节能降耗的双重目的。Small town sewage is characterized by great change in quality and quantity with season. Considering meeting the standard and energy saving, the operation mode and parameters should be regulated according to sewage quality and quantity. Aiming at the low concentration and low C/Nratioo of influent and the high energy consumption during the operation of Wansheng WWTP at normal temperature, the optimization research of different operating modes was carried out. The results show that in the nonrestrictive step aeration mode with a cycle period of 4 h, namely influent/aeration 2 h （DO 〈 1 mg/L during the first one hour and DO 2 to 3 mg/L during the later one hour） , sedimentation 1 h and decanting 1 h, the effluent quality meets the first level B criteria specified in Discharge Standard of Pollutants for Mu- nicipal Wastewater Treatment Plant （GB 18918 -2002）. The removal efficiency of TN is increased by 15% compared with the original design. Through the adjustment of aeration system, the energy consumption can be reduced by 25% in the above-mentioned operation mode, thus achieving improving the efflu-ent quality and energy saving.

关 键 词：CAST 运行模式 脱氮 节能 

分 类 号：X703[环境科学与工程—环境工程]