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IJERPH
Volume 19
Issue 9
10.3390/ijerph19094944
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Article

Feasibility of Remediation of Heavy-Metal-Contaminated Marine Dredged Sediments by Active Capping with Enteromorpha Biochar

by
Zhaowei Wang
1,2,
Shuang Song
2,
Huan Wang
1,
Wenchao Yang
2,*,
Jianbo Han
2 and
Hong Chen
2
1
College of Environmental Science and Engineering, Dalian Maritime University, Dalian 116026, China
2
Marine Engineering Environmental Supervision Technology Room, National Marine Environmental Monitoring Center, Dalian 116023, China
*
Author to whom correspondence should be addressed.
Int. J. Environ. Res. Public Health 2022, 19(9), 4944; https://doi.org/10.3390/ijerph19094944
Submission received: 30 March 2022 / Revised: 14 April 2022 / Accepted: 16 April 2022 / Published: 19 April 2022
(This article belongs to the Topic Impact of Toxic Elements on Water Quality and Treatment Methods)
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Abstract

Enteromorpha biochar (BC) has been proposed as a potential absorbent in the marine environments. This study attempts to understand the process of active capping using Enteromorpha BC to prevent the release of heavy metals (Pb and Cd) from contaminated marine dredged sediments. The capping efficiency was assessed with a series of lab-scale column experiments. Results showed that the Enteromorpha BC exhibits rough pore structure and higher specific surface area, as well as more surface organic functional groups, which is favorable for its adsorption capacity and selectivity towards heavy metals. The capping thickness of 2 cm for Enteromorpha BC was sufficient to prevent the release of heavy metals from sediments, with the capping efficiency of 47% for Pb and 62% for Cd. Kinetic studies showed that heavy metals released into the overlying water can be described by a three-parameter sigmoidal kinetic model. Importantly, the fractions of heavy metals in the dredged sediments below the capping layer were analyzed to reveal the capping remediation mechanism. The outcomes of the present study indicate that capping with Enteromorpha BC is a promising method to regulate the water environment by preventing the release of heavy metals from the contaminated dredged sediments.
Keywords: capping remediation; Enteromorpha biochar; dredged sediments; heavy metals capping remediation; Enteromorpha biochar; dredged sediments; heavy metals
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MDPI and ACS Style

Wang, Z.; Song, S.; Wang, H.; Yang, W.; Han, J.; Chen, H. Feasibility of Remediation of Heavy-Metal-Contaminated Marine Dredged Sediments by Active Capping with Enteromorpha Biochar. Int. J. Environ. Res. Public Health 2022, 19, 4944. https://doi.org/10.3390/ijerph19094944

AMA Style

Wang Z, Song S, Wang H, Yang W, Han J, Chen H. Feasibility of Remediation of Heavy-Metal-Contaminated Marine Dredged Sediments by Active Capping with Enteromorpha Biochar. International Journal of Environmental Research and Public Health. 2022; 19(9):4944. https://doi.org/10.3390/ijerph19094944

Chicago/Turabian Style

Wang, Zhaowei, Shuang Song, Huan Wang, Wenchao Yang, Jianbo Han, and Hong Chen. 2022. "Feasibility of Remediation of Heavy-Metal-Contaminated Marine Dredged Sediments by Active Capping with Enteromorpha Biochar" International Journal of Environmental Research and Public Health 19, no. 9: 4944. https://doi.org/10.3390/ijerph19094944

APA Style

Wang, Z., Song, S., Wang, H., Yang, W., Han, J., & Chen, H. (2022). Feasibility of Remediation of Heavy-Metal-Contaminated Marine Dredged Sediments by Active Capping with Enteromorpha Biochar. International Journal of Environmental Research and Public Health, 19(9), 4944. https://doi.org/10.3390/ijerph19094944

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