低碳氮比污水提标改造工程设计及运行效果分析

汉中市城市污水处理厂升级改造工程设计规模为10×104m3/d,原主体生物处理工艺为DE氧化沟。改造工程将原出水水质标准从《城镇污水处理厂污染物排放标准》(GB 18918-2002)的一级B提高至一级A。该厂进水为典型低碳氮比污水,BOD5/TN低至1. 6,在充分利用原有设施的基础上,生化处理改为改进型AAO+流态化生物载体工艺(FBC/MBBR),并新建深度处理设施,采用化学辅助除磷。在全年未投加外碳源的情况下,实际出水水质稳定达到《地表水环境质量标准》(GB 3838-2002)准Ⅳ类标准。介绍了该工程的工艺流程、构筑物设计和设备配置情况,并对调试运行过程进行了分析总结。

Design and Operation Effect Analysis of Low C/N Ratio Sewage Upgrading and Reconstruction Project

The design capacity of Hanzhong municipal wastewater treatment plant upgrading project is 10 × 104 m3/d. The original main biological treatment process was DE oxidation ditch. The effluent water quality requirement in the renovation project was raised from previous first level B to level A of Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002).The influent of BOD5/TN was as low as 1. 6,which was typically low carbon to nitrogen ratio wastewater.Fully based on the existing facilities,the biochemical treatment was renovated into improved AAO and fluidized biological carrier process (FBC/MBBR),and a new advanced treatment facility was built,which used chemical-assisted phosphorus removal. In the case of no additional carbon source in the whole year,the actual effluent quality has reached the quasi-Ⅳ criteria of Environmental Quality Standards for Surface Water (GB 3838-2002). The technological process, structure design and equipment configuration of the project was introduced. The commissioning and operation process was analyzed and summarized.