Removal of Heavy Metal Elements and Nutrients by Pontederia cordata and Phragmites australis Constructed Wetlands

Q4 Agricultural and Biological Sciences

应用与环境生物学报 Pub Date : 2013-12-13 DOI:10.3724/SP.J.1145.2013.00179

Wei Juyang, Chen Zhanghe

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引用次数: 4

Abstract

For studying the potential applications of Pontederia cordata L.as a constructed wetland plant,the removal effects of P.cordata and Phragmites australis Trin.ex Steud.on nutrients and heavy metal elements in the wetlands were compared.Mono-cultivated small-scale wetlands were constructed using pots(80 cm-50 cm-45 cm,the upper diameter-bottom diameter-high).The results showed that the removal rates for TN and BOD5 by P.cordata was significantly higher than those by P.australis(P 0.05).But there was no significant difference between them for the removal of Cd2 + and Pb2+.Content distribution of Cd2+and Pb2+ in both plants was as follows: root stem leaf.For both the wetlands,there was little difference in nutrient removal between hydraulic retention time(HRT) of 2 d and 7 d,but heavy metal removal rate at HRT of 7 d was significantly higher than that at HRT of 2 d,indicating that the removal of heavy metals was slower than that of nutrients in the constructed wetlands.These results suggest that P.cordata has a good application potential in constructed wetlands because of its good visual effects and high removal rates for wastewater pollutants.

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人工湿地对重金属元素和营养物的去除作用

为研究桔梗草作为人工湿地植物的潜在应用价值，对桔梗草和芦苇的去除率进行了研究。Steud交货。比较了湿地的养分和重金属元素。采用盆栽(80 cm-50 cm-45 cm，上径-底径-高)构建单人工小规模湿地。结果表明，草芥对TN和BOD5的去除率显著高于南芥(P < 0.05)。但两者对Cd2 +和Pb2+的去除率无显著差异。Cd2+和Pb2+在两种植物中的含量分布如下:根、茎、叶;两种湿地在水力停留时间(HRT)为2 d和7 d时，营养物去除率差异不大，但HRT为7 d时重金属去除率显著高于HRT为2 d时，说明重金属的去除率比人工湿地中营养物的去除率慢。这些结果表明，藻藻具有良好的视觉效果和对污水污染物的去除率，在人工湿地中具有良好的应用潜力。

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来源期刊

应用与环境生物学报 Agricultural and Biological Sciences-Agronomy and Crop Science

CiteScore

1.20

自引率

0.00%

发文量

4458

期刊介绍： The “Chinese Journal of Applied and Environmental Biology” is a national scientific and technological journal published both at home and abroad. It was started in 1995 and became bimonthly in 1999, and now it is a core journal for applied and environmental biology in China. It aims to introduce and exchange the new achievements, new technologies, new methods and new progresses made from the research fields of biology and its related disciplines both in China and abroad; enhance scientific and technological research serving for the development and construction of national economy, and improvement of people’s living standards.