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The Scientific World Journal
Volume 2013, Article ID 384806, 5 pages
Research Article

Formation of Humic Substances in Weathered MSWI Bottom Ash

1School of Urban Construction, Hebei University of Engineering, Handan 056038, China
2Department of Urban and Environmental Engineering, Kyushu University, Fukuoka 819-0395, Japan

Received 2 April 2013; Accepted 15 May 2013

Academic Editors: S. Niranjan, L. Wang, and Q. Wang

Copyright © 2013 Haixia Zhang and Takayuki Shimaoka. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The study aimed at evaluating the humic substances (HSs) content from municipal solid waste incinerator (MSWI) bottom ash and its variation with time and the effect of temperature on HSs formation. The process suggested by IHSS was applied to extract HSs from two different bottom ash samples, and the extracted efficiency with NaOH and Na4P2O7 was compared. MSWI bottom ash samples were incubated at and for 1 year. HSs and nonhumic substances were extracted from the bottom ash sample with different incubated period by 0.1 M NaOH/Na4P2O7. Results show that the rate of humic acid formation increased originally with incubation time, reached a maximum at 12th week under and at 18th week under , and then decreased with time. More humic acid in MSWI bottom ash was formed under incubated condition compared with that incubated under . Also, the elemental compositions of HSs extracted from bottom ash are reported.