【摘要】 通过室外盆栽试验研究了7种水生植物对富营养化水体中氮磷的去除能力.试验结果表明:所选7种水生植物在富营养化水体中生长良好并表现出较好的氮磷去除效果.在SRP、TP进水浓度分别为0.5~1.25 mg/L和0.6~1.3 mg/L时,各种植物SRP和TP去除率随进水浓度变化趋势保持一致且SRP去除率高于TP去除率.7种植物中,千屈菜(Lythrumsali-cariaLinn)的磷去除性能最好,与无植物空白相比,其SRP和TP平均去除率分别提高12.15%和14.36%;芦苇(Phragmites communis)最差,仅使SRP和TP平均去除率提高8.61%和6.73%.7种植物TN去除性能差异显著,与无植物空白相比,水葱(Scirpus vali-dusVahl)、香蒲(Typha angustifoliaLinn)、芦苇、美人蕉(Canna generalis)、石菖蒲(AcorustatarinowiiSchott)、黄花鸢尾(Iris wilsoniiWright)和千屈菜分别使TN平均去除率提高18.19%、17.84%、16.0%、14.85%、12.6%、7.93%和7.56%.植物氮磷去除能力和实际生长情况表明,水葱、香蒲和芦苇可作为有效去除氮磷的北方人工湿地备选植物.更多还原

【Abstract】 Outdoor pot experiments were conducted to investigate seven hydrophytes’ removal effect on nitrogen and phosphorus in eutrophic water.Results indicated that all of the seven species grew well in the constructed wetlands,and showed excellent nitrogen and phosphorus removal capacities.When SRP and TP influent concentrations ranged from 0.5 to 1.25 mg/L,and 0.6 to 1.3 mg/L,respectively,SRP and TP removal efficiencies of each hydrophyte showed a consistent trend with the fluctuation of influent concentrations,and SRP removal rates were somewhat higher than TP removal rates.Among the seven hydrophytes,Lythrum salicaria Linn has the best SRP and TP removal capacities.When compared with the unplanted pot,Lythrum salicaria Linn increased the average SRP and TP removal rates by 12.15%and 14.36% respectively,while SRP and TP removal efficiencies of Phragmites communis only increased by 8.61% and 6.73%.As for TN removal performance,there was significant difference among the seven hydrophytes.After comparing with the unplanted pot,Scirpus validus Vahl showed most excellent TN removal capacity,it increased average TN removal rates by 18.19%,while 17.84% for Typha angustifolia Linn,16.0% for Phragmites communis,14.85% for Canna generalis,12.6%for Acorus tatarinowii Schott,7.93% for Iris wilsonii Wright and 7.56% for Lythrum salicaria Linn respectively.The research showed that Scirpus validus Vahl,Typha angustifolia Linn and Phragmites communis have the potentiality to be used as constructed wetland hydrophytes to remove nitrogen and phosphorus pollutants in northern China.更多还原