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Synthesis and Characterization of Iron-Rich Glass Ceramic Materials：A Model for Steel Industry Waste Reuse

Journal of Materials Science & Technology 2016年第11期32卷 1105-1110页

作者： Riccardo Carlini Ilaria Alfieri Gilda Zanicchi Francesco Soggia Enos Gombia Andrea Lorenzi Department of Chemistry and Industrial Chemistry University of GenoaVia Dodecaneso 3116146 GenovaItaly Department of Chemistry University of ParmaParco area delle Scienze 17/a43124 ParmaItaly IMEM-CNR Parco Area delle Sdenze 37/a43124 ParmaItaly

Wastes deriving from steel industry, containing large amounts of iron oxides and heavy metals, when collected in landfills are subjected to atmospheric agents, with consequent release of toxic substances in the soil and groundwater. The reuse of these wastes as raw materials for the production of advanced materials is a viable way both to overcome the environmental impact and to reduce the disposal costs,proposing new technologically advanced materials. This work aims to simulate these interesting glassceramics by using glass cullet coming from recycled municipal waste and high amount of iron（III） oxide（from 25 wt% to 50 wt%）, the prevalent component of steel waste. The oxide was mixed with glass cullet and vitrified. The samples composition and the microstructure were investigated by scanning electron microscopy（SEM）, and X-ray diffraction（XRD） was used to evaluate the nature of the crystalline phases.The chemical stability of the materials, in terms of ionic release into saline solution, was assessed. The electrical behavior of the samples was also investigated by varying the iron ions content and controlling the crystallization process. It is possible to obtain chemically stable materials with a nearly semiconducting behavior.

关键词： Glass-ceramics Electrical properties leaching tests Iron rich waste Vitrification

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leaching toxicity characteristics of municipal solid waste incineration bottom ash

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Frontiers of Environmental Science & Engineering 2016年第2期10卷 399-411页

作者： Khamphe PHOUNGTHONG Yi XIA Hua ZHANG Liming SHAO Pinjing HE State Key Laboratory of Pollution Control & Resource Reuse Tongji University Shanghai 200092 China Institute of Waste Treatment and Reclamation Tongji Universily Shanghai 200092 China Centre for the Technology Research and Training on Household Waste in Small Towns & Rural Area Ministry of Housing and Urban-RuralDevelopment of PR China (MOHURD) Shanghai 200092 China

The continuously increasing production of municipal solid waste incineration bottom ash （MSWIBA） has promoted its utilization as construction material and raised environmental concern. The physico-chemical properties and leaching behavior of MSWIBA were studied, and ecotoxicological testing using a luminescent bacterium bioassay was performed to assess the ecological pollution risks associated with its leached constituents. The MSWIBA was leached by two types of leachants, H2SO4/HNO3 and HAc solution, at different liquid to solid ratios and contact times. The concentrations of heavy metals and anions in the leachates were analyzed. Multi- variate statistical analyses, including principle component analysis, Pearson＇s correlation analysis and hierarchical cluster analysis, were used to evaluate the contributions of the constituents to the toxicity （ECso） of the MSWIBA leachate. The statistical analyses of the ecotoxicological results showed that the Ba, Cr, Cu, Pb, F and total organic carbon （TOC） concentrations were closely correlated with the ECso value, and these substances were the main contributors to the ecotoxicity of the MSWIBA leachate. In addition, the cluster of these variables indicated similar leaching behaviors. Overall, the research demonstrated that the ecotoxicological risks resulting from MSWIBA leaching could be assessed before its utilization, which provides crucial information for the adaptation of MSWIBA as alternative materials.

关键词： Municipal solid waste incineration bottomash alternative material leaching tests toxicity Vibrio qinghaiensis （Q67）

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