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Ecosystem effects of materials proposed for thin-layer capping of contaminated sediments

机译：提议对污染沉积物进行薄层封盖的材料对生态系统的影响

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摘要

Ecotoxicological effects of 2 carbonaceous and 7 mineral capping materials suggested for in situ remediation of contaminated sediments in the Grenland fjords, Norway, were investigated in a mesocosm experiment. The primary objective was to compare the various materials with regard to potentially harmful effects on the benthic ecosystem. The materials assessed were activated carbon, Kraft-lignin, sand and clay materials, and 3 industrial by-products. Using sediment box-core samples with intact benthic communities, effects on structural (bacterial, macro- and meiofauna diversity) and functional (sediment-to-water nutrient fluxes, oxygen fluxes and bacterial production) endpoints were assessed. Significant deviations from the control (no capping) were detected for all of the tested materials for at least one endpoint. Generally, materials similar to the indigenous sediment (clay, sand) had relatively low deviations from the control, whereas industrial products (plaster, 2 types of crushed marble) resulted in deviations for most endpoints and large reductions in community richness and abundance. For example, at the end of the experimental period, the number of macrofauna taxa was <10 in these treatments, compared to >27 in uncapped mesocosm and field control sediments. The results from the study show that reducing harmful ecosystem effects from thin-layer capping by selecting capping materials based on robust, multi-endpoint mesocosm bench-tests is both possible and recommendable. Potential ecosystem impacts are particularly important to consider when large areas and areas with adequate ecological status are considered for thin-layer capping.
机译：在中观实验中研究了建议用于挪威格伦兰峡湾的污染沉积物原位修复的2种碳质碳质材料和7种矿物覆盖材料的生态毒理效应。主要目的是比较各种材料对底栖生态系统的潜在危害。评估的材料为活性炭，牛皮纸-木质素，沙子和粘土材料以及3种工业副产品。使用底栖生物完整的沉积物盒核样品，评估了对结构（细菌，大型和中型动物多样性）和功能（沉积物至水的养分通量，氧气通量和细菌产生）终点的影响。在至少一个终点，所有受测材料均检测到与对照的显着差异（无上限）。通常，与本地沉积物（粘土，沙子）相似的材料与对照的偏差较小，而工业产品（灰泥，两种碎大理石）的偏差最大，导致社区的丰富度和丰度大大降低。例如，在实验期结束时，这些处理中大型动物类群的数量小于10，而未封盖的中观和田间控制沉积物中的大型动物类群数量则大于27。研究结果表明，通过基于可靠的多端点介观基准测试选择封盖材料来减少薄层封盖对生态系统的有害影响是可能的，也是值得推荐的。当考虑将大面积和具有适当生态状态的区域用作薄层封盖时，考虑潜在的生态系统影响尤为重要。

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  • 来源
    《Marine ecology progress series》 |2012年第8期|p.27-39|共13页
  • 作者

    J. Naslund; G. S. Samuelsson; J. S. Gunnarsson; F. J. A. Nascimento; H. C. Nilsson; G. Cornelissen; M. T. Schaanning;

  • 作者单位

    Department of Systems Ecology, Stockholm University, 106 91, Stockholm, Sweden,AquaBiota Water Research, 115 50 Stockholm, Sweden;

    Department of Systems Ecology, Stockholm University, 106 91, Stockholm, Sweden;

    Department of Systems Ecology, Stockholm University, 106 91, Stockholm, Sweden;

    Department of Systems Ecology, Stockholm University, 106 91, Stockholm, Sweden;

    Norwegian Institute for Water Research, 0349 Oslo, Norway,Present address: Department of Aquatic Resources, Institute oj Marine Research, Swedish University of Agricultural Sciences, 453 30 Lysekil, Sweden;

    Norwegian Geotechnical Institute, 0806 Oslo, Norway,Department of Applied Environmental Science (ITM), Stockholm University, 10691 Stockholm, Sweden,Department of Plant and Environmental Sciences, University of Life Sciences, 1432 As, Norway;

    Norwegian Institute for Water Research, 0349 Oslo, Norway;

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  • 正文语种 eng
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  • 关键词

    remediation in situ; activated carbon; clay; structural and functional effects; benthic organisms; sediment; mesocosm;

    机译：原位修复;活性炭;粘土;结构和功能的影响;底栖生物;沉淀;中观;

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