Abstract：
:This study investigated the ability of a 10-yr-old constructed wetland to treat metal-contaminated leachate emanating from a coal ash pile at the Widows Creek electric utility, Alabama (USA). The two vegetated cells, which were dominated by cattail (Typha latifolia L.) and soft rush (Juncus effusus L.), were very effective at removing Fe and Cd from the wastewater, but less efficient for Zn, S, B, and Mn. The concentrations were decreased by up to 99% for Fe, 91% for Cd, 63% for Zn, 61% for S, 58% for Mn, and 50% for B. Higher pH levels (>6) in standing water substantially improved the removing efficiency of the wetland for Mn only. The belowground tissues of both cattail and soft rush had high concentrations of all elements; only for Mn, however, did the concentration in the shoots exceed those in the belowground tissues. The concentrations of trace elements in fallen litter were higher than in the living shoots, but lower than in the belowground tissues. The trace element accumulation in the plants accounted for less than 2.5% of the annual loading of each trace element into the wetland. The sediments were the primary sinks for the elements removed from the wastewater. Except for Mn, the concentrations of trace elements in the upper layer (0-5 cm) of the sediment profile tended to be higher than the lower layers (5-10 and 10-15 cm). We conclude that constructed wetlands are still able to efficiently remove metals in the long term (i.e.,>10 yr after construction).
journal_name
J Environ Qualjournal_title
Journal of environmental qualityauthors
Ye ZH,Whiting SN,Qian JH,Lytle CM,Lin ZQ,Terry Ndoi
10.2134/jeq2001.3051710xsubject
Has Abstractpub_date
2001-09-01 00:00:00pages
1710-9issue
5eissn
0047-2425issn
1537-2537journal_volume
30pub_type
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journal_title：Journal of environmental quality
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journal_title：Journal of environmental quality
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journal_title：Journal of environmental quality
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journal_title：Journal of environmental quality
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pub_type： 杂志文章
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journal_title：Journal of environmental quality
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