Testing of winter vegetation construction and water purification effect of a cascaded wetland model of Jialu river

2011 International Symposium on Water Resource and Environmental Protection Pub Date : 2011-05-20 DOI:10.1109/ISWREP.2011.5893093

Xu-chun Ye, X. Guo

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引用次数: 2

Abstract

In order to test the winter vegetation construction and water purification of wetland in vast northern China, a cascaded surface-flow wetland model with a total area of 7400m2 was constructed along the Jialu river floodplain in Zhengzhou city of Henan province. After winter vegetation such as Potamogeton crispus, Elodea Canadensis and Iris. Sibirica were planted, vegetation development and purification effect was observed continuously. Results show that Potamogeton crispus and Elodea Canadensis survived under very low temperature and the vegetation coverage stood at 50percent, Siberian Iris all survived and issued new leaves. Water purification effect indicates that the average removal rates of nitrogen, phosphorus ammonia and CODCr were 32%, 67%, 55% and 29% respectively with hydraulic loading of 140mm·d-1, and the purification efficiency can be strengthened with gradual development of the vegetation. This study demonstrated that wetland with reasonable winter aquatic plants and species composition can ultimately improve the purification effects of wetlands in north China. In addition, waste heat in urban drainage can provide favorable conditions for winter vegetation in cascaded wetland, so it is feasible to increase appropriate water depth to built submerged vegetation with Potamogeton crispus and Elodea Canadensis.

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嘉绿江梯级湿地模型冬季植被建设及水净化效果试验

为了测试中国北方广大地区湿地冬季植被建设和水净化效果，在河南省郑州市嘉绿江漫滩沿线构建了总面积为7400m2的级联式地表流湿地模型。越冬后植物如马铃薯、加拿大叶黄果和鸢尾。种植西伯利亚，连续观察植被发育和净化效果。结果表明，在极低的温度下，马铃薯和加拿大叶冠花存活，植被盖度为50%，西伯利亚鸢尾均存活并长出新叶。水净化效果表明，水力负荷为140mm·d-1时，对氮、磷、氨和CODCr的平均去除率分别为32%、67%、55%和29%，且随着植被的逐渐发育，净化效率会逐渐增强。本研究表明，合理的冬季水生植物和物种组成能最终提高华北湿地的净化效果。此外，城市排水余热可以为梯级湿地冬季植被提供有利条件，因此，利用马铃薯和加拿大叶蝉增加适当的水深来建设淹没植被是可行的。

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2011 International Symposium on Water Resource and Environmental Protection

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