采用A/O工艺的污水处理厂提标改造工程设计

Upgrading and Reconstruction Project Design of Wastewater Treatment Plant with A/O Process

辽宁省某污水处理厂设计规模为10×104m3/d,采用A/O处理工艺。升级改造工程要求设计出水水质从《城镇污水处理厂污染物排放标准》(GB 18918—2002)一级B标准提升至一级A标准。针对出水总氮超标问题,增设一组A/O生化池,以降低脱氮负荷,同时增设碳源投加系统,从而保证了脱氮效率;针对进水含砂量大,导致粗、细格栅和提升水泵等机械设备磨损严重的问题,提标改造中增设了粗格栅及平流沉砂池,使进水中的砂在平流沉砂池内预沉,同时去除大颗粒漂浮物,从而保证了粗、细格栅及提升泵的正常运行。实际运行表明,提标改造工程出水水质完全达到一级A标准。

A/O process was adopted in a wastewater treatment plant with capacity of 10×104 m3/ d in Liaoning Province. The effluent quality of reconstruction project was required to be upgraded from the first level B standard to the first level A criteria specified in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant （GB 18918 -2002）. Denitrifying load would be lowered by con- struction of a new A/O biochemical tank, and nitrogen removal efficiency would be ensured by supple- ment of carbon source. The inlet water contained a lot of grit which led to serious wear of mechanical e- quipment such as coarse screen, fine rack and lift pumps. The grit and large particles of floatation in wa- ter would be settled by usage of the coarse screen and the horizontal flow grid chamber. As a result, the coarse screen, fine rack and lift pumps would operate normally. Actual operation showed the effluent quality could meet the first level A standard.