| 潜流人工湿地中氮磷污染物净化的分层效应研究 |
| 摘要点击 3858 全文点击 2393 投稿时间：2010-03-18 修订日期：2010-05-31 |
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| 中文关键词 人工湿地 分层效应 去除负荷 去除率 pH |
| 英文关键词 constructed wetland segregation effect removal rate removal efficiency pH |
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| 中文摘要 |
| 选定芦苇、小叶章为湿地植物，土壤、炉渣为基质，构建3个小型潜流人工湿地系统，通过间歇运行方式，考察了模拟系统上层、下层中N、P和pH值等指标的变化．结果表明，当水力停留时间为10 d时，小叶章和芦苇湿地上层总氮的去除负荷分别为0.771 g·(m2·d)-1和1.481 g·(m2·d)-1，分别是下层的1.15倍和1.31倍;小叶章和芦苇湿地上层溶解性总磷的去除负荷分别为1.655 g·(m2·d)-1和6.838 g·(m2·d)-1，分别是下层的1.13倍和1.28倍，湿地系统上层N、P净化能力高于下层．湿地系统pH值具有规律性变化趋势，以土壤-炉渣为基质的湿地上层pH值小于下层，以土壤为基质的湿地上层pH大于下层，系统具有良好的缓冲能力．pH值先升高后降低的拐点可作为NH+4-N反应结束的指示参数. |
| 英文摘要 |
| Three minitype subsurface-horizontal flow constructed wetlands planted with Calamagrostis angustifolia and Phragmites australis and filled with soil and slag were used to investigate the N,P and pH for upper layer and underlayer wetland system by intermission operation.Results demonstrated that TN removal rates in the superstratum of Calamagrostis angustifolia and Phragmites australis wetlands were 0.771 g·(m2·d)-1,1.481 g·(m2·d)-1 with 10 days of the hydraulic retention,which were 1.15 and 1.31 times higher than that of underlayer wetland systems,respectively.Simultaneity,TP removal rates in the superstratum of Calamagrostis angustifolia and Phragmites australis wetlands were 1.655 g·(m2·d)-1,6.838 g·(m2·d)-1,respectively,which were 1.13 and 1.28 times higer than that of underlayer wetland systems,respectively.The purification ability of upper layer in the wetland system was higher than that of underlayer.A regular trend of pH changes and upstanding buffer ability of wetland system were found.The pH values in the upper layer of soil-slag wetlands were smaller than that of underlayer which was contrary to the soil wetland.The break-point of pH curve indicates the termination of NH+4-N reaction in constructed wetland. |
