Municipal Solid Waste Composition and Valorization of Bottom Ash
New developments in treatment technology hold the promise of turning MSWI bottom ash into an interesting resource of minerals and metals. Important issues in the valorization of bottom ash are the enrichment of metals, the organics content, and the leaching behavior of the ash. A pertinent question is to what extent the waste composition in the input of the incinerator adds to the resource value of the ash. In this study, physical and chemical properties of bottom ash from incinerators in China and the Netherlands were firstly judged in terms of their resource values. It proved that various waste components had a direct effect on the characteristics of the resulting bottom ash. Secondly it was judged if the input specific waste components influence on the resource value of bottom ash. This was investigated by combustion tests of synthetic samples of waste. Several kinds of specific wastes were employed, such as metals waste including Cu, stainless steels, iron, and aluminum packaging wastes, but also small WEEE, PVC, shredder fluff, and sewage sludge were considered. The results show that the metals in the waste all transfer to the bottom ash with the exception of aluminum. Aluminum products in the waste create a distribution of metal droplets in the ash with an average size that can be related to the wall thickness of the original product. Gold and silver from small WEEE ended up mainly in the 150 μm-2 mm fraction of the ash. The presences of PVC, shredder fluff, small WEEE, and sewage sludge greatly increased the toxicity risks of bottom ash when considered as a mineral.
Municipal solid waste incineration bottom ash resource value
Y. J. Hu B. Maarten G. Y. Chen
Zhejiang University of Technology, Hangzhou, China Delft University of Technology, Delft, the Nether Delft University of Technology, Delft, the Netherlands Tianjin University, Tianjin, China
国际会议
北京
英文
1056-1062
2010-05-17（万方平台首次上网日期，不代表论文的发表时间）