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Physicochemical properties of stabilized sewage sludge admixtures by modified steel slag

机译：改性钢渣稳定污水混泥混合的物理化学特性

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摘要

Cement stabilization is used extensively to solidify sludge. However, previous studies suggest that the organic acids in sludge can restrain the hydration processes of cementitious materials. This study presents a new binder (steel slag based materials) whose effectiveness of stabilization was investigated on sewage sludge. Several series of tests for solidified sludge were conducted including the moisture content, compressive strength, shear force, permeability, and toxicity characteristic leaching (TCLP). The result shows that the stabilization effect of physicochemical properties of stabilized sewage by SI* (content 90% steel slag) were better than that of cement. With 20% SI, the moisture content of the sludge could be reduced to 30% at 20+l°C for 7 days;; The compressive strength was 74.5 kappa and the permeability coefficient was 5.03 x 10 5 (cm/s);; The TCLP was below the limit value. The hydration products of paste and solidified sludge at 1, 3,14, 28, and 90 days were analyzed by XRD, SEM, and energy spectroscopy to distinguish ettringite/ iron ettringite in SI solidified sludge, the result shows the Needle-like ettringite of SI possess high iron content and may be Fe-Aft.
机译：水泥稳定化广泛用于固化污泥。然而，之前的研究表明污泥中的有机酸可以抑制水泥材料的水合过程。本研究提出了一种新的粘合剂（钢渣基材料），其在污水污泥上研究了稳定的有效性。进行了几系型凝固污泥测试，包括水分含量，抗压强度，剪切力，渗透性和毒性特征浸出（TCLP）。结果表明，Si *（含量90％钢渣）稳定污水的物理化学性质的稳定效应优于水泥。含有20％Si，污泥的水分含量可在20 + 1℃下减少至30％7天;抗压强度为74.5κA，渗透系数为5.03×10 5（cm / s）; TCLP低于极限值。通过XRD，SEM和能谱分析糊状物和固化污泥的水合产物，以区分凝固矿/铁Ettringite在Si凝固污泥中，结果显示了针状Ettringite Si具有高铁含量，可以是Fe-船尾。

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  • 来源
    《Open Chemistry》 |2018年第2期|共8页
  • 作者

    Xi Zhu; Fei Li; Jingdong Zhang;

  • 作者单位

    Department of Environmental Science and Engineering Zhongnan University of Economics and Law Wuhan 430073 China;

    Department of Environmental Science and Engineering Zhongnan University of Economics and Law Wuhan 430073 China;

    Research Center for Environment and Health Zhongnan University of Economics and Law Wuhan 430073 China;

    Department of Environmental Science and Engineering Zhongnan University of Economics and Law Wuhan 430073 China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 关键词

    Steel slag; Sludge; Solidification and hydration; Leaching toxicity; Ettringite/Iron ettringite.;

    机译：钢渣;污泥;凝固和水合;浸出毒性;Ettringite /铁Ettringite。;

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