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Comparison of alternative remediation technologies for recycled gravel contaminated with heavy metals

机译:比较重金属污染的再生碎石的替代修复技术

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摘要

To evaluate the effects of different remediation methods on heavy metals contaminated recycled gravel, three immobilization agents (monopotassium phosphate, lime, nano-iron) and two mobilization agents (glyphosate, humic acid (HA)) were studied and compared. Results indicated that nano-iron powder was found to be more effective to immobilize Zn, Cu, Pb and Cd. Meanwhile, glyphosate presents a higher mobilization effect than HA with removal rates of about 66.7% for Cd, more than 80% for Cr, Cu and Zn, and the highest removal percentage of 85.9% for Cr. After the mobilization by glyphosate, the leaching rates of Zn, Cu and Cr were about 0.8%, and below 0.2% for Pb and Cd. The leaching rates after nano-iron powder treatment were 1.18% for Zn, 0.96% for Cr, 0.61% for Cu, 0.45% for Pb and Cd not detected. The formation and disappearance of metal (Zn/Cu/Cr/Pb/Cd) compounds were firmly confirmed through X-ray diffraction and scanning electron microscopy analyses on crystalline phases and morphological surface structures.
机译:为了评估不同修复方法对受重金属污染的再生碎石的影响,研究并比较了三种固定剂(磷酸二氢钾,石灰,纳米铁)和两种固定剂(草甘膦,腐殖酸(HA))。结果表明,发现纳米铁粉更有效地固定了Zn,Cu,Pb和Cd。同时,草甘膦具有比HA高的动员效果,对Cd的去除率约为66.7%,对Cr,Cu和Zn的去除率超过80%,对Cr的去除率最高,为85.9%。草甘膦动员后,锌,铜和铬的浸出率约为0.8%,铅和镉的浸出率低于0.2%。纳米铁粉处理后的浸出率为未检出的锌为1.18%,铬为0.96%,铜为0.61%,铅和镉为0.45%。通过X射线衍射和扫描电子显微镜对晶相和形态表面结构的分析,可以牢固地确认金属(Zn / Cu / Cr / Pb / Cd)化合物的形成和消失。

著录项

  • 来源
    《Waste management & research》 |2015年第11期|1005-1014|共10页
  • 作者单位

    The State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, P.R. China;

    Institute of Hydrobiology, Chinese Academy of Sciences, P.R. China;

    The State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, P.R. China;

    National Institute for Environmental Studies, Japan;

    The State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, P.R. China;

    The State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, P.R. China;

    The State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, P.R. China,The State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, 325, Mingjing Building, No. 1239 Siping Road, Shanghai, 200092, P.R. China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Contaminated recycled gravel; construction and demolition wastes; heavy metals; mobilization; immobilization; glyphosate;

    机译:污染的再生碎石;建筑和拆除废物;重金属;动员;固定草甘膦;

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