百乐克池不停水升级改造为A^2O生化池工程设计

A Renovation Design Case of the A^2O Biochemical Tank Transformed from BIOLAK Tank without Water Interruption

长春市某污水处理厂设计规模为3×10^4m^3/d,原生化池采用百乐克处理技术,设计出水水质为《城镇污水处理厂污染物排放标准》(GB 18918-2002)一级B标准。现由于出水水质标准需提高至一级A标准,故对污水厂进行提标改造。鉴于提标改造施工中污水厂不能停水,同时又需要对现有生化池进行改造,设计采用混凝土预制构件拼接成墙体在原百乐克池分隔出厌氧区、缺氧区、好氧区,将百乐克池改造成A^2O生化池,并采用预制混凝土基础安装潜水搅拌机。经工程实践证明该设计是可行的,既满足了工艺运行的需求,同时预制构件的梯形结构形式也被证明是稳定可靠的。提标改造工程完成后,实际运行结果表明,出水水质能够稳定达到《城镇污水处理厂污染物排放标准》(GB 18918-2002)中一级A标准。

The design treatment capacity of a wastewater treatment plant in Changchun City is 30000 m^3/d,the original biochemical process adopted BIOLAK treatment technology,and the original designed effluent water quality was the first level B standard specified in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB 18918-2002).Due to the higher effluent water quality standard required to meet the first level A standard,it was needed to upgrade the plant.The wastewater treatment process operation could not be stopped,and the existing biochemical tank needed to be modified.In this design,precast concrete components were spliced into walls to separate the BIOLAK tank into anaerobic zone,anoxic zone and aerobic zone.BIOLAK tank was transformed into A^2O biochemical tank.Precast concrete foundation was adopted to reconstruct and install submersible mixers.It was proved feasible by the upgrading and reconstruction project,which not only met the requirements of process operation,but also proved that the structure of precast concrete components was stable and reliable.After the completion of the upgrading and reconstruction project,actual operation results showed that the effluent quality could stably meet the first level A standard specified in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB 18918-2002).