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http://dx.doi.org/10.14478/ace.2014.1007

Investigation of Characteristics of Incinerator Bottom Ash and Assessment for Recycle due to the Change of MSW Composition  

Lee, Woo Chan (Department of Environmental Engineering, University of Seoul)
Shin, Deuk Chol (Department of Environmental Engineering, University of Seoul)
Dong, Jong In (Department of Environmental Engineering, University of Seoul)
Publication Information
Applied Chemistry for Engineering / v.25, no.1, 2014 , pp. 103-106 More about this Journal
Abstract
Recycling of bottom ash from municipal solid waste (MSW) incinerator has been strictly limited due to its composition of high level chlorine and other unfavorable substances. The composition of MSW has been, however, changed after the introduction of garbage-bag sales system, extended producer responsibility (EPR) policy and the prohibition of direct landfill of food waste. Recent waste shows reduced moisture and chlorine content, increased calorific value due to the separation of food waste, incombustible materials and PVC. The main purpose of this study is to investigate the trend of composition changes of MSW incinerator bottom ash and to compare the analytical results with those before the separation system was introduced. CaO content of bottom ash, one of the major component of cement clinker, increased from 26.7% in 2001 to 34.0% in 2006. The chlorine content showed a dramatic decrease from 1.84% in 2001 to 0.00655% in 2006, which is closely compatible with that of the fly ash of coal-utilizing thermal power plants, which is mainly due to the changes of MSW composition. It is eventually considered that there is a possibility of utilizing the incinerator bottom ash as a raw material of cement clinker feed substances.
Keywords
MSW; incinerator; bottom ash; chlorine; moisture;
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