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    人工湿地园林植物对生活污水中氨氮净化效果的影响

    关键词:园林植物;人工湿地;污水生态处理;湿地植物;氨氮;净化效果

    Key words:landscape plants; constructed wetland; ecological treatment of wastewater; wetland plant; NH4+-N; purification effect

    摘要:本实验采取了最接近自然湿地表面流的人工湿地系统,通过3次重复的随机区组田间实验设计,采用Origin软件进行随机区组双因素平衡方差分析,采用Minitab软件进行多重比较分析和差异显著性检验,研究了污水不同停留时间和不同人工湿地植物及其协同作用对生活污水中氨氮(NH4+-N)的净化效果。结果表明:停留时间1d、3d、5d时,不同植物种类及组合对氨氮的净化效果差异都极显著水平,芦竹+香蒲+美人蕉组合对氨氮净化率皆为最大;停留时间1d、3d时,芦苇+芦竹组合氨氮净化率为最小;停留时间5d时,芦苇净化率最小。净化氨氮效果最好的植物组合首选为“芦竹+香蒲+美人蕉”、 其次为“芦竹+香蒲”或“芦苇+香蒲+美人蕉”;净化氨氮效果最好的植物种类首选为香蒲,其次为芦竹。

    Abstract:The study on the species selection of wetland plants and the purification effects of the wetland plants is the key to ecological wastewater treatment technology. The purification effects of different wetland plants in different residence time and their synergy in NH4+-N disposal in living wastewater are studied by adopting the surface flow wetland system which is closest to the natural wetlands, through three repeated randomized block field experimental designs, through the variance analysis of two-factor equilibrium of the randomized block with Origin software, and through multiple comparisons and analysis and the test of significant differences with Minitab software. The results show that within the residence time of 1 day, 3 days and 5 days, the purification effects of different plant species and their combinations in NH4+-N disposal are significantly different, and that the NH4+-N purification rate of the combination of Arundo donax, Typha orientalis and Canna generalis is highest. Within the residence time of 1 day and 3 days, the NH4+-N purification rate of the combination of Phragmites australis and Arundo donax is lowest. Within the residence time of 5 days, the NH4+-N purification rate of Phragmites australis is lowest. The best plant combination in purifying NH4+-N is that of Arundo donax, Typha orientalis and Canna generalis, followed by that of Arundo donax and Typha orientalis or that of Phragmites australis, Typha orientalis and Canna generalis. The best plant species in purifying NH4+-N is Typha orientalis, followed by Arundo donax.