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Characterization of char derived from various types of solid wastes from the standpoint of fuel recovery and pretreatment before landfilling

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Title: Characterization of char derived from various types of solid wastes from the standpoint of fuel recovery and pretreatment before landfilling
Authors: Hwang, I.H. Browse this author
Matsuto, T. Browse this author
Tanaka, N. Browse this author
Sasaki, Y. Browse this author
Tanaami, K. Browse this author
Keywords: Carbonization
Solid wastes
Fuel recovery
Pre-treatment before landfilling
Issue Date: 2007
Publisher: Pergamon
Journal Title: Waste Management
Volume: 27
Issue: 9
Start Page: 1155
End Page: 1166
Publisher DOI: 10.1016/j.wasman.2006.05.013
PMID: 16920347
Abstract: Carbonization is a kind of pyrolysis process to produce char from organic materials under an inert atmosphere. In this work, chars derived from various solid wastes were characterized from the standpoint of fuel recovery and pretreatment of waste before landfilling. Sixteen kinds of municipal and industrial solid wastes such as residential combustible wastes, non-combustible wastes, bulky wastes, construction and demolition wastes, auto shredder residue, and sludges were carbonized at 500℃ for 1 h under nitrogen atmosphere. In order to evaluate the quality of char as fuel, proximate analysis and heating value were examined. The composition of raw waste had a significant influence on the quality of produced char. The higher the ratio of woody biomass in waste, the higher heating value of char produced. Moreover, an equation to estimate heating value of char was developed by using the weight fraction of fixed carbon and volatile matter in char. De-ashing and chlorine removal were performed to improve the quality of char. The pulverization and sieving method seems to be effective for separation of incombustibles such as metal rather than ash. Most char met a 0.5 wt% chlorine criterion for utilization as fuel in a shaft blast furnace after it was subjected to repeated water-washing. Carbonization could remove a considerable amount of organic matter from raw waste. In addition, the leaching of heavy metals such as chrome, cadmium, and lead appears to be significantly suppressed by carbonization regardless of the type of raw waste. From these results, carbonization could be considered as a pre-treatment of waste before landfilling as well as for fuel recovery.
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 松藤 敏彦

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