https://scholars.lib.ntu.edu.tw/handle/123456789/577005
Title: | A simulation study of mercury immobilization in estuary sediment microcosm by activated carbon/clay-based thin-layer capping under artificial flow and turbation | Authors: | Ting Y Ch'ng B.-L Chen C Ou M.-Y Cheng Y.-H Hsu C.-J Hsi H.-C. HSING-CHENG HSI |
Keywords: | Activated carbon; Clay minerals; Mercury (metal); Mercury compounds; Estuary sediments; Methyl mercury; Microcosm studies; Sediment remediation; Simulation studies; Suspension properties; Thin layers; Total mercuries; Sediments; activated carbon; bentonite; chloride; iron; kaolin; mercury; methylmercury; montmorillonite; sulfate; sulfide; activated carbon; clay; computer simulation; estuarine sediment; immobilization; mercury (element); methylmercury; microcosm; sediment chemistry; Article; bioturbation; controlled study; estuary; microcosm; oxidation reduction potential; particle resuspension; pollution control; priority journal; thin layer capping | Issue Date: | 2020 | Journal Volume: | 708 | Source: | Science of the Total Environment | Abstract: | In-situ thin layer capping (TLC) is a promising sediment remediation approach that has been shown effective in immobilizing contaminants from releasing to natural biotas and human beings. This research intended to comprehend the effectiveness of Hg immobilization by TLC under turbation condition via a microcosm study. Three TLC caps with different activated carbon (AC)/clay combinations were applied to actual Hg-contaminated estuary sediment (76.0 ± 2.6 mg-Hg/kg). The caps with AC (3%) + bentonite (3%) and AC (3%) + kaolin (3%) were efficient in reducing both total mercury (THg) and methylmercury (MeHg) concentrations in overlying water by 75–95% and 64–98%, respectively, in the later stage of 75-d operation. In contrast, the AC (3%) + montmorillonite (3%) cap did not show a significant reduction on THg and MeHg in the overlying water, probably due to the unstable, suspension property of montmorillonite. The stable caps showed higher resistance to Hg breakthrough under occasional turbation events; however, a labile cap appeared to have dramatic Hg breakthrough when turbation occurred. It is therefore essential to note that with unstable caps, turbation events may result in unwanted secondary resuspension of contaminants. ? 2019 Elsevier B.V. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85076016427&doi=10.1016%2fj.scitotenv.2019.135068&partnerID=40&md5=2b1916fab8fbdfa44b9da9a1cdacd2d3 https://scholars.lib.ntu.edu.tw/handle/123456789/577005 |
ISSN: | 489697 | DOI: | 10.1016/j.scitotenv.2019.135068 |
Appears in Collections: | 環境工程學研究所 |
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