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Chemical stabilization of heavy metals in municipal solid waste incineration fly ash: a review

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Abstract

Sufficient attention should be attached to the large amount of fly ash containing high levels of toxic heavy metals generated after municipal solid waste incineration. Because heavy metals could be leached out of the fly ash under specific conditions, it is necessary to stabilize the heavy metals in fly ash before landfill disposal. Processing technologies of incineration fly ash include solidification/stabilization technology, thermal treatments, and separation processes. This study reviewed the current treatment technologies of municipal solid waste incineration (MSWI) fly ash, with the main focus on the treatment of heavy metals in fly ash with chemical stabilization. Chemical stabilization processes involve chemical precipitation of heavy metal and chelation of heavy metals. In multiple studies, chemical stabilization technology has shown practical feasibility in terms of technology, economy, and effect. In addition, the combination of two or more stabilization agents broadens the general applicability of the agents to heavy metals and reduces the cost. The application of joint processing technology realizes the remove of soluble salt from fly ash. To minimize pollutants while increase their usable value, effective use of waste and co-disposal of several kinds of wastes have gradually become the research hotspots. New developments in chemical stabilization are progressively moving towards the sustainable direction of harmlessness and resource utilization of MSWI fly ash.

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Data Availability

Some data that support the findings of this study are available from the Statistical Yearbook of the Chinese Ministry of Housing and Urban–Rural Development. Other data presented in this paper are from references.

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Funding

This study was supported by the National Natural Science Foundation of China (42077346); Chengdu Science and Technology Project (2018-YF05-00760-SN); the Strategic Cooperation Project Between Sichuan University and Panzhihua Municipal Government (20826041D4287); and the Strategic Cooperation Project Between Sichuan University and Yibin Municipal Government (2019CDYB-19). These funds provided support in the design of the study and collection, interpretation of data, and manuscript writing.

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NN was in charge of literature data collection. JYY and ZSY provided guidance on the conception and writing of the article. XYZ was responsible for reviewing and summarizing literatures in related fields and was a major contributor in writing the manuscript. All authors read and approved the final manuscript.

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Correspondence to Jin-yan Yang.

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The authors declare no competing interests.

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Communicated by Ta Yeong Wu.

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Zhao, Xy., Yang, Jy., Ning, N. et al. Chemical stabilization of heavy metals in municipal solid waste incineration fly ash: a review. Environ Sci Pollut Res 29, 40384–40402 (2022). https://doi.org/10.1007/s11356-022-19649-2

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  • DOI: https://doi.org/10.1007/s11356-022-19649-2

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