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首页> 外文期刊>Journal of soil & sediments >Effects of dredging operations on sediment quality: contaminant mobilization in dredged sediments from the Port of Santos, SP, Brazil
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Effects of dredging operations on sediment quality: contaminant mobilization in dredged sediments from the Port of Santos, SP, Brazil

机译：疏operations作业对沉积物质量的影响：巴西桑托斯港疏dr的沉积物中的污染物动员

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摘要

Background, aim, and scope Contaminated sediments are a worldwide problem, and mobilization of contaminants is one of the most critical issues in environmental risk assessment insofar as dredging projects are concerned. The investigation of how toxic compounds are mobilized during dredging operations in the channel of the Port of Santos, Brazil, was conducted in an attempt to assess changes in the bioavail-ability and toxicity of these contaminants. Materials and methods Bulk sediment samples and their interstitial waters and elutriates were subjected to chemical evaluation and ecotoxicological assessment. Samples were collected from the channel before dredging, from the dredge's hopper, and from the disposal site and its surroundings. Results The results indicate that the bulk sediments from the dredging site are contaminated moderately with As, Pb, and Zn and severely with Hg, and that polycyclic aromatic hydrocar-rnbon (PAH) concentrations are relatively high. Our results also show a 50% increase in PAH concentrations in suspended solids in the water collected from the hopper dredge. This finding is of great concern, since it refers to the dredge overflow water which is pumped back into the ecosystem. Acute toxicity tests on bulk sediment using the amphipod Tiburonella viscana showed no toxicity, while chronic tests with the sea urchin Lytechinus variegatus showed toxicity in the interstitial waters and elutriates. Results are compared with widely used sediment quality guidelines and with a sediment quality assessment scheme based on various lines of evidence. Conclusions The data presented here indicate that the sediments collected in this port show a certain degree of contamination, especially those from the inner part of the channel. The classification established in this study indicated that sediments from the dredged channel are impacted detrimentally and that sea disposal may disperse contaminants. According to this classification, the sediments are inappropriate for disposal at sea. It should be emphasized that the poor quality of fine sediments discharged from the hopper dredge in the overflow process can recontaminate the environment. Recommendations and perspectives These findings will help to underpin improved planning of management strategies for dredging operations and sediment disposal in Brazil and other countries.
机译：背景，目标和范围受污染的沉积物是一个世界性的问题，就疏projects项目而言，污染物的迁移是环境风险评估中最关键的问题之一。为了评估这些污染物的生物利用度和毒性变化，研究了在巴西桑托斯港口航道的疏operations作业中如何转移有毒化合物。材料和方法对大块沉积物样品及其间质水和洗出液进行化学评估和生态毒理学评估。在疏before之前，从渠道，疏'机的料斗，处置场所及其周围收集样品。结果结果表明，疏the现场的大量沉积物被As，Pb和Zn污染中等，而被Hg污染严重，多环芳烃的含量相对较高。我们的结果还表明，从漏斗挖泥机收集的水中悬浮固体中的PAH浓度提高了50％。这一发现引起了极大的关注，因为它指的是疏通到系统中的溢流水。使用两栖类短小Tiburonella viscana对散装沉积物进行的急性毒性试验未显示毒性，而对海胆Lytechinus variegatus进行的慢性试验则显示在间质水和淘洗液中具有毒性。将结果与广泛使用的沉积物质量指南和基于各种证据的沉积物质量评估方案进行比较。结论结论此处提供的数据表明，在此港口收集的沉积物显示出一定程度的污染，尤其是来自航道内部的沉积物。这项研究建立的分类表明，疏channel航道的沉积物受到了有害影响，海上处置可能会分散污染物。根据此分类，沉积物不适合在海上处置。应当强调的是，在溢流过程中，从漏斗挖泥机排出的细小沉积物质量差，会污染环境。建议和观点这些发现将有助于加强巴西和其他国家疏dr作业和沉积物处置管理战略的规划。

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  • 来源
    《Journal of soil & sediments》 |2009年第5期|420-432|共13页
  • 作者

    Ronaldo J. Torres; Denis M. S. Abessa; Fernando C. Santos; Luciane A. Maranho; Marcela B. Davanso; Marcos R. L. do Nascimento; Antonio A. Mozeto;

  • 作者单位

    Laboratorio de Biogeoquimica Ambiental, Departamento de Quimica, Universidade Federal de Sao Carlos, Caixa Postal 676, CEP 13565-905 Sao Carlos, Sao Paulo, Brazil;

    Campus Experimental do Litoral Paulista, UNESP-Universidade Estadual Paulista 'Julio de Mesquita Filho', Pca. Infante D. Henrique, s°, CEP 11330-900 Sao Vicente, Sao Paulo, Brazil;

    Laboratorio de Biogeoquimica Ambiental, Departamento de Quimica, Universidade Federal de Sao Carlos, Caixa Postal 676, CEP 13565-905 Sao Carlos, Sao Paulo, Brazil;

    Campus Experimental do Litoral Paulista, UNESP-Universidade Estadual Paulista 'Julio de Mesquita Filho', Pca. Infante D. Henrique, s°, CEP 11330-900 Sao Vicente, Sao Paulo, Brazil;

    Campus Experimental do Litoral Paulista, UNESP-Universidade Estadual Paulista 'Julio de Mesquita Filho', Pca. Infante D. Henrique, s°, CEP 11330-900 Sao Vicente, Sao Paulo, Brazil;

    Laboratorio de Pocos de Caldas (LAPOC), CNEN-Comissao Nacional de Energia Nuclear, Rodovia Andradas, km 13, CEP 37701-970 Pocos de Caldas, Minas Gerais, Brazil;

    Laboratorio de Biogeoquimica Ambiental, Departamento de Quimica, Universidade Federal de Sao Carlos, Caixa Postal 676, CEP 13565-905 Sao Carlos, Sao Paulo, Brazil;

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  • 正文语种 eng
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  • 关键词

    assessment; dredging; metals; persistent organic compounds; santos harbor; sediments;

    机译：评定;疏;金属;持久性有机化合物;桑托斯港沉积物;

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