Effectiveness of a constructed wetland for treating alkaline bauxite residue leachate: a 1-year field study
Effectiveness of a constructed wetland for treating alkaline bauxite residue leachate: a 1-year field study
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DOI：
10.1007/s11356-017-8544-1
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发表时间：
2017-02
影响因子：
5.8
通讯作者：
D. Higgins;T. Curtin;R. Courtney
中科院分区：
文献类型：
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作者：
D. Higgins;T. Curtin;R. Courtney
铝土矿残渣及其相关沥滤液的不断增加对氧化铝工业构成了重大的环境挑战。人工湿地已被提议作为渗滤液处理的一种潜在方法，但现场规模应用的数据有限。本文介绍的研究对爱尔兰一个铝土矿废渣处置场的专用人工湿地缓冲渗滤液进行了初步评价。一年多的数据表明，铝土矿渣渗滤液的pH值可以有效地降低约。pH值10.3至8.1，但受进水的变化和时间变化。湿地也是有效的，在减少元素负荷，和连续提取表明，大部分的沉积物结合的金属库存是在难以浸出的阶段。元素分析ofPhragmites australis表明，虽然植被表现出季节性变化，没有微量元素的关注浓度。
Increasing volumes of bauxite residues and their associated leachates represent a significant environmental challenge to the alumina industry. Constructed wetlands have been proposed as a potential approach for leachate treatment, but there is limited data on field-scale applications. The research presented here provides preliminary evaluation of a purpose-built constructed wetland to buffer leachate from a bauxite residue disposal site in Ireland. Data collected over a 1-year period demonstrated that the pH of bauxite residue leachates could be effectively reduced from ca. pH 10.3 to 8.1 but was influenced by influent variability and temporal changes. The wetland was also effective in decreasing elemental loading, and sequential extractions suggested that the bulk of the sediment-bound metal inventory was in hard-to-leach phases. Elemental analysis ofPhragmites australisshowed that although vegetation displayed seasonal variation, no trace elements were at concentrations of concern.