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首页> 外文期刊>Journal of Residuals Science & Technology >Stabilization/solidification of electroplating sludge using cement/silica fume
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Stabilization/solidification of electroplating sludge using cement/silica fume

机译：使用水泥/硅粉稳定/固化电镀污泥

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Stabilization/Solidification (S/S) is used as a pre-lanfilling waste treatment technology that aims to hazardous wastes safe for disposal. Inorganic binders such as cement are widely used as an appropriate binder for S/S treatment of hazardous waste. In this study cement and silica fume were used to stabilize hexavalent chromium present in the electroplating sludge. The degree of chromium stabilization was evaluated using the Toxicity Characteristic Leaching Procedure (TCLP) Test, Compression Test and XRD analysis.The specimens were prepared based on various Cr+6 concentration in sludge (12,6,1 gr/l). The results showed that the chromium concentration in leaching solution for 12 and 6 g/l Cr+6 in sludge is more than the maximum contaminated level (5 mg/l) in TCLP test after 90 days curing. The obtained result showed that the average Cr+6 fixation was about 90 which seems to be acceptable for the present situation of electroplating sludge disposal in Iran. As the matrix of cement paste, the addition of sludge containing 12 gr/l Cr+6 encouraged the formation of CaCrO4.H2O, as observed through XRD analysis. Another obtained data showed that the partial replacement of cement with 10 silica fume increased the efficiency of Cr+6 fixation and compensate any negative effects caused by sludge on cement hydration. It should be mentioned that the compressive strength amounts of all samples are more than the minimum EPA compressive strength for stabilized wastes (3.5 Kg/Cm-2).
机译：稳定/凝固 （S/S） 被用作预填填废物处理技术，旨在安全处置危险废物。水泥等无机粘结剂被广泛用作危险废物S/S处理的合适粘结剂。在这项研究中，使用水泥和硅粉来稳定电镀污泥中存在的六价铬。使用毒性特征浸出程序 （TCLP） 测试、压缩测试和 XRD 分析评估铬的稳定程度。根据污泥中不同Cr+6浓度（12,6,1 gr/l）制备试样。结果表明，固化90 d后，污泥中12和6 g/l Cr+6的浸出液铬浓度均大于TCLP试验中的最大污染水平（5 mg/l）。结果表明，Cr+6的平均固着率约为90%，这对于伊朗电镀污泥处理的现状似乎是可以接受的。作为水泥浆料的基质，通过XRD分析观察到，添加含有12 gr/l Cr+6的污泥促进了CaCrO4.H2O的形成。另一项数据表明，用10%硅粉部分替代水泥提高了Cr+6的固定效率，并补偿了污泥对水泥水化造成的负面影响。值得一提的是，所有样品的抗压强度都大于稳定废物的最低EPA抗压强度（3.5 Kg/Cm-2）。

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