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Hydrothermal solidification of municipal solid waste incineration fly ash

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Abstract

Hydrothermal solidification of municipal solid waste incineration (MSWI) fly ash has been conducted under saturated steam pressure at 200 °C for up to 48 h with quartz addition. To enhance the strength of solidified specimens further, the raw fly ash was pre-treated by water-washing and mixed with NaOH solution (2 M) as reaction solvent. Experimental results showed that curing time and temperature had significant effects on strength development. Strength development was found to be mainly due to tobermorite formation, and addition of quartz and NaOH solution promoted tobermorite formation. The raw fly ash could also be used as an additive to solidify MSWI bottom ash, and with raw fly ash addition (10%) the flexural strength of solidified specimens reached more than 21 MPa, suggesting high potential to recycle 100% MSWI ash (e.g. as 10% fly ash + 90% bottom ash). Leaching tests were conducted to determine amounts of heavy metals dissolved from solidified specimens. The results showed that under the hydrothermal conditions of this study, leaching of heavy metals was very low. As such, the hydrothermal processing method might have high potential for recycling/reusing MSWI fly ash on a large scale.

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Acknowledgments

The work reported here was supported by the Shanghai Pujiang Program (China) (no. 08PJ14098), Shanghai Science and Technology Committee Program (China) (no. 09JC1413900), and the National Natural Science Foundation of China (no. 50872096, 51072138).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Tongji University, Shanghai, 200092, China

    Chengchong Shan, Zhenzi Jing, Lili Pan, Lei Zhou, Xiaohui Pan & Lei Lu

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  1. Chengchong Shan
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  2. Zhenzi Jing
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  3. Lili Pan
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  4. Lei Zhou
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  5. Xiaohui Pan
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Correspondence to Zhenzi Jing.

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Shan, C., Jing, Z., Pan, L. et al. Hydrothermal solidification of municipal solid waste incineration fly ash. Res Chem Intermed 37, 551–565 (2011). https://doi.org/10.1007/s11164-011-0287-x

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  • DOI: https://doi.org/10.1007/s11164-011-0287-x

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