反硝化生物滤池+高效气浮工艺用于准Ⅳ类提标改造

Application of Denitrifying Biofilter and High‑efficiency Air Floatation in Upgrading of a WWTP for Quasi‑ⅣStandard

采用反硝化生物滤池+高效气浮池作为新增深度处理工艺,对长沙市坪塘污水处理厂(一期)进行提标改造,将厂区出水水质由《城镇污水处理厂污染物排放标准》(GB 18918—2002)的一级B标准提高到《地表水环境质量标准》(GB 3838—2002)准Ⅳ类标准,工程设计规模为4×10^(4)m^(3)/d(Kz=1.3),深度处理占地仅约1800 m2。调试及运行期间深度处理组合工艺出水水质均稳定优于准Ⅳ类标准,具有占地面积小、电耗和药耗可控等优点,可为环境敏感地区和需要高品质出水的污水厂提标改造工程,特别是用地比较紧张的同类工程提供借鉴。

Denitrifying biofilter and high‑efficiency air floatation tank are used as new advanced treatment processes to upgrade and transform the phaseⅠproject of Changsha Pingtang wastewater treatment plant(WWTP).The effluent quality of the WWTP is improved from first level B criteria in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB 18918-2002)to quass‑Ⅳstandard in Environmental Quality Standards for Surface Water(GB 3838-2002).The design capacity of the project is 4×10^(4)m^(3)/d(Kz=1.3),and the footprint of advanced treatment is only about 1800 m2.During commissioning and operation,the effluent of the combined advanced treatment process is stably superior to the quasi‑Ⅳstandard.It has the advantages of small footprint,controllable power and chemical consumption,which can provide reference for the upgrading and reconstruction project of WWTPs in environmentally sensitive areas and requiring high‑quality effluent,especially similar projects with tight land use.