PTA^2O强化脱氮除磷工艺用于亚龙湾污水处理厂二期工程  

Application of PTA^2O Enhanced Nitrogen and Phosphorus Removal Process in Second Phase Project of Yalong Bay Sewage Treatment Plant

作　　者：王建西 WANG Jian-xi(North China Municipal Engineering Design & Research Institute Co. Ltd.,Tianjin 300381,China)

机构地区：[1]中国市政工程华北设计研究总院有限公司

出　　处：《中国给水排水》2019年第16期48-52,共5页China Water & Wastewater

摘　　要：亚龙湾污水处理厂一期工程设计规模为1. 5×10~4m^3/d,2004年投产,现已满负荷运行。一期采用BC-O生物巢工艺,该工艺是把特殊设计的纤维填料作为生物巢置于框架内,放置于曝气生物池中,作为菌群的固定膜床。二期工程设计规模为1×10~4m^3/d,前期5 000 m^3/d于2018年底建成投产。因一期生物巢易堵塞,二期工程采用PTA^2O强化脱氮除磷工艺,该工艺在传统A^2O工艺基础上对曝气、回流、沉淀等进行了改进。将传统的推流式改为环流式布置,采用可以不停车更换的曝气软管技术,维护方便;采用气提大比例回流方式替代水下搅拌器和推进器,运行节能;将高效斜管沉淀装置置于曝气池内完成泥水分离,不采用大型的辐流式沉淀池。PTA^2O工艺占地小、设备少、维护方便、运行节能、效果稳定。实际运行表明,该工程出水COD <20 mg/L,其他出水水质指标均优于《城镇污水处理厂污染物排放标准》(GB 18918-2002)的一级A标准,出水用于城市杂用。The design treatment capacity of first phase Yalong Bay sewage treatment plant was 1. 5 × 10~4 m^3/d. It was put into operation in 2004,and it is now running at full load. In the first phase,BC-O biological nest process was adopted,which placed the specially designed fiber packs as biological nests in the framework,in the biological aeration tank,as the fixed biofilm bed of flora. The design treatment capacity of the second phase project was 1 × 10~4 m^3/d,and the previous period of 5 000 m^3/d was completed and put into operation at the end of 2018. Because the first phase of biological nests was easy to be clogged,the second phase of the project used the PTA^2O enhanced nitrogen and phosphorus removal process,which improved aeration,reflux,precipitation on the basis of traditional A^2O process.In the aspect of sewage flow pattern,the traditional push flow was changed to circular flow arrangement,and the aeration hose which could be replaced without stopping operation was adopted,which was convenient for maintenance. In the aspect of sludge reflux,the air lift-large proportion reflux method was used to replace the underwater agitator and thruster, which contributed to economical energy consumption. In the aspect of precipitation,the highly efficient slant tube sedimentation device was placed in the aeration tank to complete the separation of sludge and water,and the large radiative flow sedimentation tank was not used. PTA^2O process had the advantages of small land occupation,less equipment,convenient maintenance,energy saving and stable effect. The effluent COD of the second phase project was less than 20 mg/L,and other indexes of effluent quality were better than the criteria specified in the first level A of Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002). The effluent could be utilized for urban miscellaneous use.

关 键 词：PTA^2O工艺 生活污水 强化脱氮除磷 

分 类 号：TU992.3[建筑科学—市政工程]