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首页> 外文期刊>Journal of Hazardous Materials >Novel synergy of Si-rich minerals and reactive MgO for stabilisation/solidification of contaminated sediment
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Novel synergy of Si-rich minerals and reactive MgO for stabilisation/solidification of contaminated sediment

机译：富硅矿物和活性MgO的新型协同作用，可稳定/固化受污染的沉积物

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摘要

Disposal of significant amounts of dredged contaminated sediment poses an economic and environmental problem worldwide. Transforming contaminated sediment into value-added construction materials using low carbon MgO cement is a sustainable option; however, the weak mechanical strength and unreliable water solubility of MgO cement restrict its practical engineering applications. This study elucidates the potential role of industrial Si-rich minerals in the performance enhancement of MgO-based products via the promotion of magnesium silicate hydrate (M-S-H) gel formation. Quantitative X-ray diffraction and Si-29 nuclear magnetic resonance analyses indicated that compositions and crystallinities of the Si-rich minerals significantly influence the formation and polymerisation of the M-S-H gel. Pulverised fly ash was found to be a promising Si-rich mineral for generating polymeric M-S-H gel, whereas incinerated sewage sludge ash samples demonstrated a low degree of polymerisation, and the use of glass powder samples gave a low yield of M-S-H. The formation of M-S-H gel enhanced the compressive strength and water resistance (strength retention after water immersion). Further experiments demonstrated that Si-modified MgO cement can transform dredged sediment into fill materials with satisfactory mechanical properties and contaminant immobilisation. Therefore, the synergy between reactive MgO and Si-rich industrial waste is a novel option for sustainable remediation and environmental applications.
机译：处置大量疏dr的污染沉积物在全球范围内造成了经济和环境问题。使用低碳MgO水泥将污染的沉积物转化为增值的建筑材料是一种可持续的选择；然而，MgO水泥的弱机械强度和不可靠的水溶性限制了其实际的工程应用。这项研究阐明了工业硅富矿物质通过促进硅酸镁水合物（M-S-H）凝胶形成而在基于MgO的产品性能提升中的潜在作用。定量X射线衍射和Si-29核磁共振分析表明，富Si矿物的组成和结晶度显着影响M-S-H凝胶的形成和聚合。发现粉状飞灰是一种有前途的富含硅的矿物，可用于生成聚合物M-S-H凝胶，而焚化的污水污泥灰分样品显示出低聚合度，而使用玻璃粉样品则产生的M-S-H收率低。 M-S-H凝胶的形成增强了抗压强度和耐水性（浸水后强度保持）。进一步的实验表明，Si改性的MgO水泥可以将疏sediment的沉积物转变为具有令人满意的机械性能和固定污染物的填充材料。因此，反应性MgO与富硅工业废料之间的协同作用是可持续修复和环境应用的新选择。

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  • 来源
    《Journal of Hazardous Materials》 |2019年第5期|695-706|共12页
  • 作者

    Wang Lei; Chen Liang; Cho Dong-Wan; Tsang Daniel C. W.; Yang Jian; Hou Deyi; Baek Kitae; Kua Harn Wei; Poon Chi-Sun;

  • 作者单位

    Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hung Hom, Kowloon, Hong Kong, Peoples R China;

    Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hung Hom, Kowloon, Hong Kong, Peoples R China;

    Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hung Hom, Kowloon, Hong Kong, Peoples R China;

    Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hung Hom, Kowloon, Hong Kong, Peoples R China;

    Shanghai Jiao Tong Univ, Sch Naval Architecture Ocean & Civil Engn, State Key Lab Ocean Engn, Shanghai, Peoples R China;

    Tsinghua Univ, Sch Environm, Beijing 100084, Peoples R China;

    Chonbuk Natl Univ, Soil Environm Res Ctr, Dept Environm Engn, 567 Baekje Daero, Jeonju 54896, South Korea;

    Natl Univ Singapore, Dept Bldg, Sch Design & Environm, 4 Architecture Dr, S-117566 Singapore, Singapore;

    Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hung Hom, Kowloon, Hong Kong, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Potentially toxic elements; Green/sustainable remediation; Metal immobilisation; Waste valorisation/recycling; Reactive magnesia cement;

    机译：潜在有毒元素;绿色/可持续修复;金属固定;废物增值/回收;活性氧化镁水泥;

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