摘要
选择不同的植物组合,分别在6组复合垂直流人工湿地的下行池、上行池种植金边石菖蒲(Acorus gramineus)、宽叶泽苔(Caldesia reniformis);慈姑(Sagittaria sagittifolia)、水葱(Scirpus validus);灯芯草(Juncus effuses)、梭鱼草(Pontederia cordata),并设置对应的曝气组合。在人工气候室条件下,研究曝气对复合垂直流人工湿地氮的净化效果。结果表明,不同植物组合的人工湿地连续曝气能有效的提高对氨氮和亚硝态氮的去除效果,金边石菖蒲和宽叶泽苔曝气人工湿地组合对氨氮的平均去除率最高,达到84.88%,灯芯草和梭鱼草人工湿地组合对亚硝态氮的去除率最高,达到94.91%,但连续曝气产生的富氧环境不利于硝态氮的去除,甚至会引起硝态氮的富集;曝气组合人工湿地硝化作用强度略大于非曝气组合,而反硝化作用强度相反;沿进水方向硝化作用强度逐渐减低,反硝化强度沿程变化不明显,非曝气组合反硝化作用强度大于曝气组合;各人工湿地反硝化作用强度明显大于硝化作用强度,曝气能够有效地提高人工湿地硝化作用强度和降低反硝化作用强度。
Six groups of integrated vertical flow constructed wetlands were used in this paper. Three combinations of Acorus gramineus and Caldesia reniflrmis; Sagittaria sagittifolia and Sofistem bulrush; Junous effuses and Pontederia cordata are planted on the down/up pool respectively, and the corresponding aeration combinations were set as well. The effects of aeration treatment on removing nitrogen in the landscape water of integrated vertical flow constructed wetland were tested. All the treatments were conducted in the condition of artificial climate chamber. The result showed that the treatment of aeration in different combination of plants could improve the removal effect of ammonia and nitrite nitrogen in wetland, and among all, the combination of Acorus gramineus and Caldesia reniflrmis resulted the highest removal efficiency of ammonia, which reached 84.88% while the combination of Junous effuses and Pontederia eordata made the highest removal efficiency of nitrite, which was about 94.91%. But the treatment of continuous aeration was not benefit to remove nitrate and even would result in the enrichment of nitrate because of much oxygen produced during the aeration period; the intensity of nitrification was much stronger in the treatment of aeration than that in the treatment of non-aeration in constructed wetland; along the sampling points, the nitrification intensity was gradually reduced and the denitrification intensity was not changing so significantly compared to nitrification intensity. Compared with the treatment of aeration and non-aeration, the denitnfication intensity was much stronger in the aeration conditon; in all constructed wetland used in this paper, denitrification intensity were significantly stronger than nitrification intensity, and aeration can improve the effect of denitrification and reduce the nitrification intensity at the same time.
出处
《湿地科学》
CSCD
2011年第3期270-276,共7页
Wetland Science
基金
国家自然科学基金项目(40871243)
国家林业局林业公益性行业科研专项项目(201104088)
上海市科委重点攻关项目(10231201600)
上海市能源作物育种及应用重点实验室项目(10DZ2271800)
上海市重点学科项目(S30109)资助
关键词
曝气
复合垂直流人工湿地
硝化作用强度
反硝化作用强度
净化效果
aeration
integrated vertical flow constructed wetland
nitrification
denitrification intensity
purifying effect
