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Fixation Mechanism and Leachability of Heavy Metal for Sludge Solidified by Silica Fume and Cement  

Jun, Kwan-Soo (School of Civil, Urban and Environmental Engineering, Yeungnam University)
Hwang, Byung-Gi (Division of Civil and Environmental Engineering, Sang Myung University)
Publication Information
Applied Chemistry for Engineering / v.16, no.2, 2005 , pp. 180-186 More about this Journal
Abstract
This paper discusses the development of mixtures for silica fume as a stabilization/solidification agent and a binder for industrial wastewater residue containing organic and heavy metal contaminants. The UCS (unconfined compressive strength) gradually increased to 66.7% as the silica fume content increased to 15%. The leaching of TOC (total organic carbon) and chromium decreased as more OPC (Ordinary Portland Cement) was substituted with the silica fume. When a mixture had 5% silica fume, it retained about 85% TOC, and chromium leached out 0.76 mg-Cr/g-Cr in acidic solution. Also, microstructural studies of the solidified analysis showed that the silica fume caused an inhibition to the ettringite formation which did not contrilbute to setting but coated the cement particles and retarded the setting reactions. The results indicated that the incorporation of silica fume into the cement matrix minimized the detrimental effects of organic materials on the cement hydration reaction and the contaminant leachability.
Keywords
solidification; silica fume; sludge; heavy metal; microstructure analysis;
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