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Waste Management & Research
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Feasibility study on solidification of municipal solid waste incinerator fly ash with circulating fluidized bed combustion coal fly ash

Wenshi Liu

School of Resource and Environmental Sciences, Wuhan University, Wuhan, PR China, liuwenshi{at}hotmail.com

Haobo Hou

School of Resource and Environmental Sciences, Wuhan University, Wuhan, PR China

Chuhao Zhang

School of Resource and Environmental Sciences, Wuhan University, Wuhan, PR China

Dajie Zhang

School of Environment and Urban Construction, Wuhan University of Science and Engineering, Wuhan 430073, PR China

The objective of this study was to assess the feasibility of solidification of municipal solid waste incinerator (MSWI) fly ash with circulation fluidized bed combustion (CFBC) fly ash, which is unsuitable as a cement replacement due to its high amounts of carbon, lime and anhydrite. The solidification process was conducted on samples prepared from MSWI fly ash, binders (cement clinkers and CFBC fly ash were mixed at two replacement ratios) and water (water/solid weight ratio = 0.4), among which the MSWI fly ash replaced each binder at the ratio of 0, 20, 40, 60 and 80% by dry weight. The samples were subjected to compressive strength tests and Toxicity Characteristic Leaching Procedure and the results showed that all solidified MSWI fly ash can meet the landfill standard imposed by US EPA after 28 days of curing. Micro-analysis (X-ray diffraction, scanning electron microscopy and Fourier transform infrared spectrophotometry) revealed that the main hydrate products were C—S—H gel and ettringite, which have a positive effect on heavy metals retention. Therefore, this method provides a possibility to achieve a cheap and effective solution for MSWI fly ash management and use for CFBC fly ash.

Key Words: Municipal solid waste incinerator fly ash • circulation fluidized bed combustion fly ash • solidification/stabilization • heavy metal • wmr 08—0003

This version was published on May 1, 2009

Waste Management & Research, Vol. 27, No. 3, 258-266 (2009)
DOI: 10.1177/0734242X08095017
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