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

Zhaowei Wang, Shuang Song, Huan Wang, Wenchao Yang, Jianbo Han and Hong Chen
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Zhaowei Wang: College of Environmental Science and Engineering, Dalian Maritime University, Dalian 116026, China
Shuang Song: Marine Engineering Environmental Supervision Technology Room, National Marine Environmental Monitoring Center, Dalian 116023, China
Huan Wang: College of Environmental Science and Engineering, Dalian Maritime University, Dalian 116026, China
Wenchao Yang: Marine Engineering Environmental Supervision Technology Room, National Marine Environmental Monitoring Center, Dalian 116023, China
Jianbo Han: Marine Engineering Environmental Supervision Technology Room, National Marine Environmental Monitoring Center, Dalian 116023, China
Hong Chen: Marine Engineering Environmental Supervision Technology Room, National Marine Environmental Monitoring Center, Dalian 116023, China

IJERPH, 2022, vol. 19, issue 9, 1-12

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 (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
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