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首页> 外文期刊>Journal of the American Water Resources Association >Accretion of Nutrients and Sediment by a Constructed Stormwater Treatment Wetland in the Lake Tahoe Basin
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Accretion of Nutrients and Sediment by a Constructed Stormwater Treatment Wetland in the Lake Tahoe Basin

机译：太浩湖盆地人工雨水处理湿地对养分和沉积物的吸收

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This unique study evaluates the cumulative 16-year lifetime performance of a wetland retention basin designed to treat stormwater runoff. Sediment cores were extracted prior to basin excavation and restoration to evaluate accretion rates and the origin of materials, retention characteristics of fine particulate matter, and overall pollutant removal efficiency. The sediment and organic layers together accreted 3.2cm of depth per year, and 7.0kg/m(2)/yr of inorganic material. Average annual accretion rates in g/m(2)/yr were as follows: C, 280; N, 17.7; P, 3.74; S, 3.80; Fe, 194; Mn, 2.68; Ca, 30.8; Mg, 30.7; K, 12.2; Na, 2.54; Zn, 0.858; Cu, 0.203; and B, 0.03. The accretion of C, N, P and sediment was comparable to nonwastewater treatment wetlands, overall, and relatively efficient for stormwater treatment wetlands. Comparison of particle size distribution between sediment cores and suspended solids in stormwater runoff indicated the wetland was effective at removing fine particles, with sediment cores containing 25% clay and 56% silt. A majority of the accretion of most metals and P could be attributed to efficient trapping of allochthonous material, while over half the accretion of C and N could be attributed to accumulation of autochthonous organic matter. Stormwater treatment was shown to be effective when physical properties of a retention basin are combined with the biological processes of a wetland, although sediment accretion can be relatively rapid.
机译：这项独特的研究评估了设计用于处理雨水径流的湿地保留盆地的16年累积寿命表现。在盆地开挖和恢复之前，先提取沉积物芯，以评估积聚率和材料来源，细颗粒物的保留特性以及总体污染物去除效率。沉积物和有机层每年共吸收3.2cm的深度，而每年吸收7.0kg / m（2）/年的无机材料。 g / m（2）/年的年平均增生率如下：C，280; N，17.7。 P，3.74； P，3.75。 S，3.80。铁，194； Mn为2.68。 Ca，30.8；镁30.7； K，12.2；钠2.54；锌0.858；铜0.203；和B，0.03。总体而言，C，N，P和沉积物的积聚可与非废水处理湿地相提并论，而对雨水处理湿地的积聚相对有效。比较雨水径流中沉积物核心和悬浮固体之间的粒度分布，表明湿地可有效去除细颗粒，沉积物核心包含25％的粘土和56％的淤泥。大多数金属和P的大部分积聚可归因于对异源物质的有效捕集，而C和N的一半以上积聚可归因于自生有机物的积累。当保留盆地的物理特性与湿地的生物过程相结合时，雨水处理被证明是有效的，尽管沉积物的积聚可能相对较快。

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