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Efficacy of dredging engineering as a means to remove heavy metals from lake sediments

机译：挖泥工程作为从湖泊沉积物中去除重金属的手段的功效

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摘要

Dredging is used worldwide to remove polluted sediments from water bodies. However, the dredging efficacy remains hard to identify. Here, we studied the efficacy of dredging engineering as a means to remove Cu, Cd, and Pb from polluted lake sediments, after six years of completion. Dissolved metals and DGT-labile metals were quantified in the non-dredged and post-dredged sediments by high-resolution dialysis (HR-Peeper) and diffusive gradients (DGT) in thin films techniques. April and July measurements showed that dredging was effectively remediate the polluted sediments. The dissolved Pb, Cd, and Cu contents decreased up to 30%, 44%, and 26%, and the DGT-labile contents decreased up to 51%, 27%, and 33% compared with the contents in the non-dredged zone. Dredging was thus proven efficient in decreasing the labile metal fractions, increasing the capacity of available solids to bind metals, and slowing the leaching of metals from available solids in the post-dredged sediments. In October and January, the dredging efficacy was counteracted by the decomposition of algae, which increased the dissolved and DGT-labile metal concentrations in the post-dredged zone. (c) 2019 Elsevier B.V. All rights reserved.
机译：疏worldwide在全球范围内用于清除水体中的污染沉积物。但是，疏efficacy效果仍然难以确定。在这里，我们研究了挖泥工程在完成六年后作为从污染的湖泊沉积物中去除Cu，Cd和Pb的方法的功效。通过薄膜技术中的高分辨率透析（HR-Peeper）和扩散梯度（DGT），对非疏red和疏d后沉积物中的溶解金属和DGT不稳定金属进行定量。 4月和7月的测量表明，疏dr有效地修复了受污染的沉积物。与非疏red区相比，溶解的Pb，Cd和Cu含量降低了30％，44％和26％，而DGT不稳定的含量降低了51％，27％和33％ 。因此，事实证明，疏可有效减少不稳定金属的含量，增加可用固体与金属结合的能力，并减慢后疏sediment沉积物中可用固体中金属的浸出。在十月和一月，藻类的分解抵消了疏efficacy效果，藻类的分解增加了后疏zone区的溶解金属和DGT不稳定的金属浓度。 （c）2019 Elsevier B.V.保留所有权利。

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  • 来源
    《The Science of the Total Environment》 |2019年第15期|181-190|共10页
  • 作者

    Chen Musong; Ding Shiming; Gao Shuaishuai; Fu Zhen; Tang Wanying; Wu Yuexia; Gong Mengdan; Wang Dan; Wang Yan;

  • 作者单位

    Chinese Acad Sci, Nanjing Inst Geog & Limnol, State Key Lab Lake Sci & Environm, Nanjing 210008, Jiangsu, Peoples R China;

    Chinese Acad Sci, Nanjing Inst Geog & Limnol, State Key Lab Lake Sci & Environm, Nanjing 210008, Jiangsu, Peoples R China;

    Chinese Acad Sci, Nanjing Inst Geog & Limnol, State Key Lab Lake Sci & Environm, Nanjing 210008, Jiangsu, Peoples R China|Univ Chinese Acad Sci, Beijing 100049, Peoples R China;

    Nanjing Univ Sci & Technol, 200 Xiaolingwei Rd, Nanjing 210094, Jiangsu, Peoples R China;

    Nanjing Univ Sci & Technol, 200 Xiaolingwei Rd, Nanjing 210094, Jiangsu, Peoples R China;

    Chinese Acad Sci, Nanjing Inst Geog & Limnol, State Key Lab Lake Sci & Environm, Nanjing 210008, Jiangsu, Peoples R China;

    Shanghai Water Source Construct Dev Co Ltd, Shanghai 200437, Peoples R China;

    Shanghai Waterway Engn Design & Consulting Co Ltd, Shanghai 200120, Peoples R China;

    Chinese Acad Sci, Nanjing Inst Geog & Limnol, State Key Lab Lake Sci & Environm, Nanjing 210008, Jiangsu, Peoples R China|Nanjing EasySensor Environm Technol Co Ltd, Nanjing 210018, Jiangsu, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Sediment; Dredging engineering; Heavy metals; Passive sampling;

    机译：泥沙疏engineering工程重金属被动取样;

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