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Stabilization of As-contaminated dredged sediment using Al- and Fe-impregnated food waste biochar

  • Sediments, Sec 5 • Sediment Management • Research Article
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Abstract

Purpose

Aluminum- and iron-impregnated food waste biochar (Al-FWBC and Fe-FWBC) have been suggested for the remediation of dredged sediments contaminated with arsenic (As).

Materials and methods

Sediment was obtained from a reservoir surrounded by several abandoned gold mines. High As concentration (102.7 mg kg−1) of the sediment corresponded to a severely contaminated level, but other heavy metals were in acceptable ranges without toxic concerns. Al-FWBC and Fe-FWBC, successfully synthesized in a previous study to remove As from aqueous solutions, were used as stabilization/solidification (S/S) agents in the current study. A sequential extraction procedure was applied to investigate the fractionation and stability of As in sediments.

Results and discussion

Amendment of Al-FWBC and Fe-FWBC for 6 months reduced the non-specifically and specifically sorbed fractions but increased the residual fraction. Fe-FWBC 1% was most efficient in stabilizing As in the sediment and it decreased 45.4% of non-specifically and specifically sorbed fractions. The effect of Al-FWBC and Fe-FWBC amendments was further confirmed by measuring potential ecological risk, and the contamination factor decreased from a considerably polluted to moderately polluted level. Arsenic and other heavy metals that leached from the S/S-treated sediments via toxicity characteristic leaching procedure did not exceed the values prescribed by the US Environmental Protection Agency.

Conclusions

Stabilization/solidification treatment using Al-FWBC and Fe-FWBC, converted from waste to value-added substances for environmental pollution control, can be applied to remediate sediments contaminated with As.

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Data availability

All data generated or analyzed during this study are included in this published article. The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

References

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Funding

This work was supported by Korea Environment Industry & Technology Institute (KEITI) through Aquatic Ecosystem Conservation Research Program, funded by Korea Ministry of Environment (grant number: RE202201970).

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Authors and Affiliations

Authors

Contributions

Seung-Hee-Hong: experiment, data analysis, writing—original draft; Soonho Hwang: conceptualization; Chang-Gu Lee: writing—review and editing; Seong-Jik Park: conceptualization, writing—review and editing, supervision.

Corresponding author

Correspondence to Seong-Jik Park.

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Conflict of interest

The authors declare no competing interests.

Research involving human participants and/or animals

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Responsible editor: Jos Brils

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Hong, SH., Hwang, S., Lee, CG. et al. Stabilization of As-contaminated dredged sediment using Al- and Fe-impregnated food waste biochar. J Soils Sediments 23, 2628–2640 (2023). https://doi.org/10.1007/s11368-023-03520-z

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  • DOI: https://doi.org/10.1007/s11368-023-03520-z

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