Evaluating waste disposal systems |
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Authors: | Yasuhiko Wada Takuma Okumoto Nariaki Wada |
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Institution: | (1) Civil and Environmental Engineering, Faculty of Engineering, Kansai University, Yamate 3-3-35, Suita, Osaka 564-8680, Japan;(2) Graduate School of Engineering, Kobe University, Kobe, Japan |
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Abstract: | Waste disposal systems conventionally exhibit many problems, such as difficulties in finding final disposal sites for incinerator
residues and the issue of how to recycle waste materials. Some new technologies have been developed to solve such problems,
including ash melting and gasification melting. Furthermore, to improve the power generation efficiency of waste treatment
facilities so that their energy is used more efficiently, combined stoker/gas turbine power generation (super waste power
generation) technology has been developed. Through examination of two cases in this study, environmental impacts and costs
were determined using lifecycle assessment (LCA) and lifecycle cost (LCC) methods in a model city. In case 1, a stoker furnace
was compared to a combined stoker/gas turbine system. In case 2, a stoker furnace plus ash melting system was compared to
a gasification melting system. The results demonstrate that the stoker furnace has a lower environmental impact than the combined
stoker/gas turbine system in case 1, and that the stoker plus ash melting system costs less than the gasification melting
system in case 2, but both systems had strong impacts on the environment. |
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Keywords: | Stoker Super waste power generation Gasification melting Ash melting Lifecycle assessment (LCA) Lifecycle cost (LCC) |
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