复合垂直流人工湿地除氮正交试验研究

Orthogonal Experimental Research on Nitrogen Removal with Integrated Vertical Flow Constructed Wetlands

[目的]为提高湿地除氮效率提供理论依据。[方法]选择美人蕉和风车草构建的复合垂直流人工湿地试验系统开展除氮正交试验研究,确定复合垂直流人工湿地流程、水力负荷、pH值、COD等因素对除氮效果的影响。[结果]复合垂直流人工湿地流程、水力负荷、pH值、COD等对除氮效果均具有影响,各因素对氨氮去除率的影响由大到小依次为：流程〉水力负荷〉pH值〉COD,对总氮去除率的影响由大到小依次为：流程〉水力负荷〉COD〉pH值;当流程为1 100 mm,水力负荷为181.25 mm/d,pH值为7~8,COD为170 mg/L时,除氮效果最好,美人蕉、风车草湿地对氨氮的去除率分别为55.90%和55.49%,对总氮的去除率分别为70.69%和65.80%。[结论]该研究确定了复合垂直流人工湿地除氮的最佳运行工况。

[Objective] The aim was to supply the theoretical basis for enhancing nitrogen（N） removal efficiency of wetland.[Method] The experimental system of integrated vertical flow constructed wetlands,which were constructed with India canna and windmill grass were selected for developing orthogonal experimental research on N removal.Then the influences of factors such as flow length,water-power load,pH value and COD of integrated vertical flow constructed wetlands on N removal effect were confirmed.[Result] The factors such as flow length,water-power load,pH value and COD of integrated vertical flow constructed wetlands all had influences on N removal effect.The influences of various factors on removal rate of ammonia N were as follows：flow length water-power load pH value COD;their influences on removal rate of total N were as follows：flow length water-power load COD pH value.When the flow length was 1 100 mm,the water-power load was 181.25 mg/L,the pH value was 7-8 and the COD was 170 mm/d,the N removal effect was the best.The removal rates of wetlands constructed with I.canna and windmill grass on ammonia N were 55.90% and 55.49% resp.and their removal rates on total N were 70.69% and 65.80% resp.[Conclusion] In this research,the optimum operation condition for N removal of integrated vertical flow constructed wetlands was confirmed.