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Waste Management & Research, Vol. 25, No. 5, 402-407 (2007)
DOI: 10.1177/0734242X07075255

Strength, leachability and microstructure characterisation of Na2SiO 3-activated ground granulated blast-furnace slag solidified MSWI fly ash

Dajie Zhang

College of Resource and Environment, Wuhan University, NO. 129 Luoyu Road, Wuhan 430079, PR China, zdajie1015{at}hotmail.com

Wenshi Liu

College of Resource and Environment, Wuhan University, NO. 129 Luoyu Road, Wuhan 430079, PR China

fHaobo Hou

College of Resource and Environment, Wuhan University, NO. 129 Luoyu Road, Wuhan 430079, PR China

Xinghua He

WISDRI Engineering & Research Incorporation Limited, Wuhan, PR China

The chemical composition and the leachability of heavy metals in municipal solid waste incinerator (MSWI) fly ash were measured and analysed. For the leachability of unstabilized MSWI fly ash it was found that the concentrations of Pb and Cr exceeded the leaching toxicity standard. Cementitious solidification of the MSWI fly ash by Na2SiO3activated ground granulated blast-furnace slag (NS) was investigated. Results show that all solidified MSWI fly ash can meet the landfill standards after 28 days of curing. The heavy metals were immobilized within the hydration products such as C—S—H gel and ettringite through physical encapsulation, substitution, precipitation or adsorption mechanisms.

Key Words: municipal solid waste incinerator fly ash • heavy metals • leaching toxicity • ground granulated blast furnace slag • solidification • wmr 1073—5


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