利用中水系统解决二沉池冬季稳定运行的运营实践  

Operation Practice in Solution of Sludge Bulking by Using of Reclaimed Water System in Secondary Sedimentation Tank in Winter

作　　者：李鹏 张强 夏海霞 LI Peng;ZHANG Qiang;XIA Haixia(Beijing ENFI Environmental Projection Co.,Ltd.,Beijing100038,China)

机构地区：[1]北京恩菲环保股份有限公司,北京100038

出　　处：《净水技术》2021年第11期158-163,共6页Water Purification Technology

摘　　要：西北L市Y污水处理厂设计规模为26万m^(3)/d,采用AAO工艺。Y污水处理厂运行过程中,发现日进水量波动较大,某典型日时变化系数按照最大时进水量/平均时进水量核算,已超过原设计总变化系数1.3。自2011年运行以来,每年冬季均发生污泥膨胀,对二沉池的稳定运行造成很大风险。通过采取超越初沉池和投加硅藻土药剂的方式,提高活性污泥无机物成分来增加其沉降性。随着进水量接近设计值,利用厂内中水系统作为冬季应急期间的二沉池,以降低现有二沉池的表面负荷,同时调整中水系统运行参数确保其出水达标,保障了Y污水处理厂的稳定运行。The design scale of Y WWTP in Northwest L City is 260000 m^(3)/d,in which AAO process is adopted.During the operation of Y WWTP,it is found that daily inflow fluctuated greatly.And the calculation of a typical daily hourly variation coefficient according to the maximum hourly inflow/average hourly inflow has exceeded original design total variation coefficient value(i.e.,1.3).Since its operation in 2011,sludge bulking has occurred in every winter,causing great risks to the stable operation of secondary sedimentation tank.In order to increase the settle ability of activated sludge,it has adopted surpassing primary settling tank and adding diatomite to improve the inorganic composition of activated sludge.Nowadays,the inflow of Y WWTP is close to design scale.To keep the running stability of Y WWTP,reclaimed water system has been used as secondary sedimentation tank in winter to reduce the load of original secondary sedimentation tank.In addition,the operation parameters of reclaimed water system have been optimized to ensure that effluent quality meets standard continuously.

关 键 词：污泥膨胀 非丝状菌 污泥容积指数(SVI) 硅藻土 斜管沉淀池 表面负荷 

分 类 号：TU992.3[建筑科学—市政工程]