复合式人工湿地尾水净化工程调试与运行

Commissioning and operation of compound constructed wetland project for tail water purification

采用“浅池单元+双向横流生态过滤单元+折流式潜流湿地单元+水平潜流湿地单元+表流湿地单元”构建了复合式人工湿地系统,介绍了湿地系统的设计流程,讨论和比较了启动期、过渡期与稳定期的270 d处理效果。实际运行结果显示:COD、NH_(4)^(+)-N、TN、TP的平均去除率分别为32.2%、51.3%、25.4%、35.2%;该系统出水水质满足《地表水环境质量标准GB3838—2002》近Ⅳ类水标准。通过与宜兴城市污水处理厂尾水净化复合式人工湿地相比较,说明复合式人工湿地系统可根据治理目标因地制宜地进行工艺组合。

A composite constructed wetland system was established with a shallow pool unit,a bidirectional cross-flow ecological filtration unit,a baffled subsurface flow wetland unit,a horizontal subsurface flow wetland unit and a surface flow wetland unit.The design process of the wetland system was introduced.And the 270d operation results among the start-up period and the transitional period as well as the steady period were discussed and compared.The actual operation results showed that the average removal rates of COD,NH_(4)^(+)-N,TN,TP were 32.2%,51.3%,25.4%and 35.2%,respectively.The effluent water quality of the system could meet the classⅣof Environmental Quality Standard for Surface Water(GB3838—2002).Compared with the composite constructed wetland system in Yixing municipal wastewater treatment plant,the composite constructed wetland system could be combined according to the local conditions with a significant ecological advantage and application value.