三级稳定塘+人工湿地组合工艺在城镇污水处理厂尾水深度处理中的应用

Application of the Combined Process of Tertiary Stabilization Pond+Artificial Wetland in Advanced Treatment of Tailwater of Urban Sewage Treatment Plant

目前,我国部分城镇污水处理厂急需提高尾水排放标准,以减小对受纳水体的影响。浙江省某城镇污水处理厂日处理量为20000 m^(3)/d,采用三级稳定塘+人工湿地组合工艺对尾水进行深度处理。经过一年连续稳定运行,该组合工艺对污水处理厂尾水具有良好的净化效果,化学需氧量(CODCr)、氨氮(NH3-N)和总磷(TP)的平均去除率分别为53.91%、57.15%和35.13%,出水水质稳定达到《地表水环境质量标准》(GB 3838—2002)的Ⅲ类水要求,有效削减入河污染物总量,保障国控断面水质稳定达标。出水可回用于农田浇灌、道路清扫和车辆清洗等,实现水资源可持续利用。

At present,some urban sewage treatment plants in China urgently need to improve their tailwater discharge standards to reduce their impact on receiving water bodies.An urban sewage treatment plant in Zhejiang Province has a daily treatment capacity of 20000 m^(3)/d,and uses a combined process of tertiary stabilization pond and artificial wetland for advanced treatment of the tailwater.After a year of continuous and stable operation,this combined process has a good purification effect on the tailwater of the sewage treatment plant,the average removal rates of chemical oxygen demand(CODCr),ammonia nitrogen(NH3-N),and total phosphorus(TP)are 53.91%,57.15%,and 35.13%,respectively,and the effluent quality steadily meets the ClassⅢwater requirements of the“Environmental Quality Standard for Surface Water”(GB 3838—2002),effectively reducing the total amount of pollutants entering the river,and ensuring that the water quality of the national control section steadily meets the standard.The effluent can be reused for farmland irrigation,road cleaning,and vehicle cleaning,achieving sustainable utilization of water resources.