组合人工湿地用于城市污水处理厂尾水深度处理

针对城市污水处理厂尾水特性,采用强化澄清调节池+微曝气垂直潜流人工湿地+水平潜流人工湿地+表面流人工湿地+氧化塘组合工艺进行处理,介绍了湿地工艺流程及设计参数,分析和讨论了稳定期的运行数据。实际运行结果表明,该组合工艺对COD、NH3-N、TP平均去除率分别为47.4%、72.6%、45.8%;垂直流人工湿地中4种不同挺水植物(芦苇、西伯利亚鸢尾、香蒲、菖蒲)对污染物去除效果差异不显著;垂直流人工湿地中植物对COD、NH3-N、TP去除贡献占比依次为20.18%、20.22%、9.75%。目前,该工程出水水质稳定达到《地表水环境质量标准》(GB 3838—2002)Ⅳ类水标准,具有较好的环境效益和社会效益。

Application of Hybrid Constructed Wetland in Tail Water Treatment of Municipal Sewage Plant

According to the characteristics of tail water of municipal sewage treatment plant,a combined process of enhanced clarification and regulation pool,micro-aeration vertical flow constructed wetland,horizontal flow constructed wetland,surface flow constructed wetland,and oxidation pond was adopted to treat it.The technical process and design parameters were introduced,the operation results during the steady period were analyzed and discussed.The practical operation showed that the average removal rates of COD,ammonia nitrogen and total phosphorus were 47.4%,72.6%and 45.8%respectively.There was no significant difference in pollutant removal effect of four different emergent plants(Phragmitesaustralis,Iris sibirica,Typhaorientalispresl and Acoruscalamus)in vertical flow constructed wetland.The contribution of plants to the removal of COD,NH3-N and TP in vertical flow constructed wetlands were 20.18%,20.22%,and 9.75%,respectively.At present,the project effluent could stability reach the levelⅣcriteria of Environment Quality Standard for Surface Water(GB 3838-2002),which had great environmental and social benefits.