Abstract
In the present study, long-term environmental impacts of compact and ground cement composites, in which 30 wt.% of cement was replaced by washed municipal solid wastes incineration (MSWI) fly ash, were investigated for use in building industry. Consecutive leaching tests over a time span of 180 days were performed in acid water, deionized water, and saline water, respectively, with the accumulative concentration of different elements determined in the leachate. Different leaching behaviors are observed among different potential toxic elements (PTEs). For instance, higher concentrations of V in the leachate were observed from the compact cement composites than those from the ground ones. The concentration of Ba in the leachate increased with the decrease of particle size of the cement composites, and an initial increase in the leaching efficiency of Sn was followed by a clear decline with the leaching time. In addition, kinetic study revealed that the leaching behaviors of potential toxic elements follow a second-order model. The results demonstrated that the addition of washed MSWI fly ash into cement can contribute to the attrition resistance, indicating that the washed MSWI fly ash could be a promising alternative for cement as supplementary building materials.
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Funding
This study was supported by National Science Fund for Distinguished Young Scholars (51522401) and National Natural Science Foundation of China (51472007). This work was also supported financially by Research Funding supported by Shenzhen Science and Technology Innovation Committee (ZDSYS201602261932201).
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Yang, Z., Tian, S., Liu, L. et al. Application of washed MSWI fly ash in cement composites: long-term environmental impacts. Environ Sci Pollut Res 25, 12127–12138 (2018). https://doi.org/10.1007/s11356-017-1181-x
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DOI: https://doi.org/10.1007/s11356-017-1181-x