浮萍与水花生净化N、P污染性能比较

Comparison on Removal Efficiency of Nitrogen and Phosphorus by Duckweed and Alternanthera philoxeroides

以经筛选得到的本地优势浮萍和水花生为研究对象,通过设置浮萍、水花生单种和浮萍-水花生混养等三种体系,考察了其对生活污水和稀释的牛场厌氧废水N、P的净化效果。结果表明,浮萍、水花生单种体系和浮萍-水花生混养体系对供试污水TN、TP的最大去除率分别为95.2%、91.1%;80.7%、75.4%和86.4%、86.4%。低有机污染条件下,浮萍吸收N、P的能力优于水花生,但其对COD的去除能力逊色于水花生;当水体有机污染程度较高时,可通过将浮萍和水花生混养,建立共生系统,以高效、稳定地去除污染物。

With locally preponderant duckweed after selection and alternanthera philoxeroides cultivated in single species and accrete system,performance on removal efficiency of nitrogen and phosphorus in municipal wastewater and diluted anaerobically pretreated wastewater from a cattle farm were investigated.Results showed that maximal removal efficiency of total nitrogen and total phosphorus by single species of duckweed,alternanthera philoxeroides system and accrete system were 95.2%,91.1%,80.7% and 75.4%,86.45%,86.4% respectively.Duckweed performs better on assimilation of nitrogen and phosphorus under low organic pollution,while it has a lower removal to COD compared with alternanthera philoxeroides.Duckweed and alternanthera philoxeroides can be cultivated together to provide an accrete system for significant and stable removal of pollutants under high organic pollution.