Utilisation of municipal solid waste incinerator (MSWI) fly ash with metakaolin for preparation of alkali-activated cementitious material.

Journal of Hazardous Materials
Jun LiuJun Ren

Abstract

The proper treatment on hazardous municipal solid waste incineration fly ash (MSWIFA) is important. The application of alkali-activation technology to prepare alkali-activated MSWIFA (AAFA) material provides a potential not only to immobilise the heavy metals, but also to trigger its pozzolanic property in manufacturing building material. In this study, in addition to investigate the feasibility of alkaline activation technology in preparing AAFA with sodium silicate activator, the effect of metakaolin in AAFA (AAFM) was also explored to enhance its performance. The results showed that, compared to the AAFA, blending 10 % metakaolin in AAFA significantly improved both 28-day and 90-days compressive strengths, which was almost 200 % higher than that of AAFA. The compressive strength was increased with increasing the dosage of sodium silicate. The C-S-H gel was observed as the main hydration product of AAFA and AAFM. Moreover, the ettringite was observed in AAFM due to the reaction between the CaSO4 in MSWIFA and aluminate phase from metakaolin. Finally, the 28 and 210-day leaching behaviours of AAFM on Zn, Cu, Pb, Cd, Cr and Ni were successfully suppressed to less than 1 % of that originally from MSWIFA, which can meet the requi...Continue Reading

References

Jun 22, 2006·Journal of Hazardous Materials·Caijun Shi, A Fernández-Jiménez
Sep 6, 2012·Journal of Hazardous Materials·Wei-Sheng ChenChun-Han Ko
Dec 9, 2015·Waste Management & Research : the Journal of the International Solid Wastes and Public Cleansing Association, ISWA·Lei WangTianhua Yang
Nov 28, 2017·Journal of Environmental Management·Yahaya YakubuYun Chen
Dec 24, 2017·Waste Management·Florian HuberJohann Fellner
Jan 11, 2019·International Journal of Environmental Research and Public Health·De-Gang LiuGuang-Hua Jiang
Jan 19, 2020·Journal of Hazardous Materials·Yong ChenWeizhong Yang

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