多级AO工艺在某高排放标准污水厂的优化探讨  

Discussion on Optimization of Multi-stage AO Process in a Wastewater Treatment Plant under High Discharge Standards

作　　者：周合喜 张金松[1] 张庆珮 ZHOU He‑xi;ZHANG Jin‑song;ZHANG Qing‑pei(Shenzhen Engineering Research Laboratory for Urban Sewage Treatment and Reclamation,Shenzhen Water Group Co.Ltd.,Shenzhen 518031,China)

机构地区：[1]深圳市水务<集团>有限公司深圳城市污水处理与再生利用工程实验室,广东深圳518031

出　　处：《中国给水排水》2022年第20期8-13,共6页China Water & Wastewater

基　　金：深圳市科技计划项目(KJYY20171012140149523)。

摘　　要：深圳市某污水处理厂采用多级AO工艺,出水水质执行《城镇污水处理厂污染物排放标准》(GB 18918—2002)一级A标准。随着城市水环境治理的深入推进,该污水厂出水水质标准需提高到《地表水环境质量标准》(GB 3838—2002)准Ⅳ类标准。近一年的运行数据表明,该厂出水COD、BOD_(5)和SS稳定达到地表水准Ⅳ类标准,出水NH_(4)^(+)-N、TN和TP基本满足标准要求,达标保障率在80%以上。基于实际运行效果,结合现状构筑物提标改造潜力,提出通过优化运行管理以满足高排放标准要求。采取的优化措施主要包括精确曝气控制系统氨氮设定目标值为0.5~1 mg/L、精确进水配比为1∶1∶1或5∶3∶2、三级内回流比为50%、化学除磷药剂投加量为35~40 mg/L及生物除磷污泥龄为19.3 d。提出的措施已纳入该污水厂提标改造工程方案,用于指导下一步提标改造工作。A multi‑stage AO process was adopted in a wastewater treatment plant in Shenzhen while the effluent quality met the first level A criteria of Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB 18918-2002).With the further development of urban water environment management,the effluent discharge standards require further improvement to meet the quasi‑classⅣcriteria of Environmental Quality Standard for Surface Water(GB 3838-2002).The operation data in the past year indicated that the effluent concentrations of COD,BOD_(5) and SS could meet the quasi‑classⅣcriteria for surface water.The NH_(4)^(+)-N,TN and TP concentrations of the effluent could basically meet the standards,and the standard compliance rates were above 80%.This paper proposed to optimize the operation management to meet the requirements of high discharge standards based on the actual operation effect and combined with the potential of the existing facilities.Specific optimized measures were as follows:the target values of ammonia in the precise aeration control system were set at 0.5-1 mg/L;the influent distribution ratio was 1∶1∶1/5∶3∶2 by precise measurement;the internal reflux ratio of the third stage was 50%;the dosages of chemical phosphorous removal were 35-40 mg/L;the sludge retention time of biological phosphorous removal was 19.3 d.The measures have been taken into project scheme for upgrading the wastewater treatment plant,which will guide the next upgrading work.

关 键 词：污水处理厂 多级AO工艺 高排放标准 优化运行管理 

分 类 号：TU992[建筑科学—市政工程]