This study examined the performance of pilot-scale vertical subsurface flow constructed wetlands (VSF-CWs) planted with three indigenous plants, i.e. Typha latifolia, Cyperus alternifolius, and Cynodon dactylon, in removing heavy metals from secondary treated refinery wastewater under tropical conditions. The T. latifolia-planted VSF-CW had the best heavy metal removal performance, followed by the Cyperus alternifolius-planted VSF-CW and then the Cynodon dactylon-planted VSF-CW. The data indicated that Cu, Cr, Zn, Pb, Cd, and Fe were accumulated in the plants at all the three VSF-CWs. However, the accumulation of the heavy metals in the plants accounted for only a rather small fraction (0.09-16%) of the overall heavy metal removal by the wetlands. The plant roots accumulated the highest amount of heavy metals, followed by the leaves, and then the stem. Cr and Fe were mainly retained in the roots of T. latifolia, Cyperus alternifolius, and Cynodon dactylon (TF < 1), meaning that Cr and Fe were only partially transported to the leaves of these plants. This study showed that VSF-CWs planted with T. latifolia, Cyperus Alternifolius, and Cynodon dactylon can be used for the large-scale removal of heavy metals from secondary refinery wastewater.

译文

:这项研究检查了在热带条件下,种植三类本地植物(即香蒲,香附子和犬齿草)的中试规模垂直地下流动人工湿地(VSF-CW)的去除重金属的性能。桔梗种植的VSF-CW具有最佳的重金属去除性能,其次是香附子种植的VSF-CW,然后是Cynodon dactylon种植的VSF-CW。数据表明,在所有三个VSF-CW处植物中均积累有Cu,Cr,Zn,Pb,Cd和Fe。但是,植物中重金属的积累仅占湿地去除的重金属总量的很小一部分(0.09-16%)。植物的根部积累了最多的重金属,其次是叶子,然后是茎。铬和铁主要保留在阔叶木兰,香附子和犬牙根(TF <1)的根中,这意味着铬和铁仅部分转运到这些植物的叶片上。这项研究表明,种植有桔梗,莎草(Cyperus Alternifolius)和犬牙根(Cynodon dactylon)的VSF-CWs可用于大规模去除二级炼油厂废水中的重金属。

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