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Uranium Removal in Artificial Wetlands

机译：人工湿地中的铀去除

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During the twentieth century, more than fifty uranium-radium mines have been exploited in Portugal. The majority of these mine sites are still in need of remediation, thus risking human health and other living beings due to the potential problems that this heavy metal might bring to ecosystems. This paper focuses on the possibility of cleaning uranium contaminated waters with vegetable species to a point where the concentrations drop to safe levels for agriculture.rnWater contaminated with uranium, with a composition similar to that of an artesian well from a farm of Seixo da Beira (Oliveira do Hospital, centre of Portugal), was used in a laboratory study. The project consisted in analysing the response of three plant species (Elodea Canadensis, Callitriche Brutea and Lemna gibba), which were collected in the stream of Anca (near Coimbra), to water contaminated with uranium. The objective was to verify which plant would show a better performance in removing uranium from the water. Following this phase, a laboratorial simulation, in a constructed wetland, was set up with the best species. The prototype wetland was filled with the uranium accumulator plant species and the concentration levels were monitored. Two irrigation tests were simulated by removing part of the water and then the prototype was refilled with new contaminated water. The goal was to reach acceptable uranium concentrations, in the water, before each irrigation episode. The results obtained in the laboratory tests were satisfactory, and the plants have shown good ability to accumulate uranium. In the second test it was possible to achieve the desired results, namely the levels of uranium in the out flowing water were below the maximum allowable values recommended by EPA for irrigation.
机译：在20世纪，葡萄牙开采了50多个铀-放射性地雷。这些矿场中的大多数仍需要整治，由于这种重金属可能给生态系统带来的潜在问题，因此危及人类健康和其他生物。本文着重探讨了用植物物种清洁铀污染水的可能性，使其浓度降至农业安全水平。rn铀污染的水，其成分类似于Seixo da Beira农场的自流井（葡萄牙中部的奥利维拉医院（Oliveira do Hospital）已用于实验室研究。该项目包括分析在安卡河（科英布拉附近）收集的三种植物对铀污染水的响应（Elodea Canadensis，Callitriche Brutea和Lemna gibba）。目的是验证哪家工厂在去除水中铀方面表现出更好的性能。在此阶段之后，在人工湿地中建立了具有最佳物种的实验室模拟。原型湿地充满了铀蓄积植物种类，并监测了其浓度水平。通过去除部分水对两个灌溉测试进行了模拟，然后将原型重新装满新的污水。目的是在每次灌溉前达到水中可接受的铀浓度。在实验室测试中获得的结果令人满意，并且植物显示出良好的铀累积能力。在第二项测试中，有可能获得理想的结果，即流出水中的铀含量低于EPA建议的灌溉最大允许值。

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  • 来源
    《Advances in waste management》|2010年|p.112-117|共6页
  • 会议地点 Kantaoui(TN);Kantaoui(TN)
  • 作者

    JOAO PRATAS; NELSON RODRIGUES; FILIPE ALVES; JOAO PATRICIO;

  • 作者单位

    Earth Sciences Department Faculty of Sciences and Technology University of Coimbra Largo Marquês de Pombal 3000-272 COIMBRA PORTUGAL Geosciences Centre University of Coimbra Largo Marquês de Pombal 3000-272 COIMBRA, Portugal;

    Earth Sciences Department Faculty of Sciences and Technology University of Coimbra Largo Marquês de Pombal 3000-272 COIMBRA PORTUGAL Geosciences Centre University of Coimbra Largo Marquês de Pombal 3000-272 COIMBRA, Portugal;

    Geosciences Centre University of Coimbra Largo Marquês de Pombal 3000-272 COIMBRA, Portugal;

    Civil Engineering Department Faculty of Sciences and Technology University of Coimbra Rua Luís Reis Santos - Pólo II da Universidade 3030-788 Coimbra, Portugal;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境污染及其防治;
  • 关键词

    Contaminated Aquifer; uranium; decontamination; constructed wetland; phytoremediation; macrophytes;

    机译：受污染的含水层；铀;去污;人工湿地；植物修复；大型植物;

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