The effects of cattails (Typha latifolia L.) on concentrations and partitioning of metals in surficial sediments of surface-flow constructed wetlands

摘要: The concentration and partitioning of metals in vegetatedand unvegetated surface sediments were compared among fourwetlands designed for wastewater treatment. In wetlands witha significant depth gradient, the highest concentrations ofmetals found deeper sediments. When theeffect was removed, with andwithout cattails (Typha latifolia L.) had similarconcentrations total (Fe, Mn, Zn Cu). However,vegetated all four higher organiccontent (p < 0.01). Furthermore, redox potential wassignificantly lower 0.01) vegetated 3out 4 wetlands. Vegetated werealso based on geochemical fractions (reactive,silicate, persistent organic pyritic). Generally, halfof metal associatedwith reactive fraction (metal oxides, monosulfides andadsorbed onto matter). an exception as associated organicfraction. shallow vegetatedsediments differed from deep at theMonahan Falconbridge contrast, there nosignificant difference insurface or without Panel andRiverwalk This study suggests that effect ofcattails bulk may be minimal surface-flow constructed