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http://dx.doi.org/10.7837/kosomes.2022.28.2.212

Evaluating the Capping Effects of Dredged Materials on the Contaminated Sediment for Remediation and Restoration of the West Sea-Byeong Dumping Site  

Kang, Dong Won (Marine Eco-Technology Institute)
Lee, Kwang Sup (Marine Eco-Technology Institute)
Kim, Young Ryun (Marine Eco-Technology Institute)
Choi, Ki-young (Korea Institute of Ocean Science and Technology)
Kim, Chang-joon (Korea Institute of Ocean Science and Technology)
Publication Information
Journal of the Korean Society of Marine Environment & Safety / v.28, no.2, 2022 , pp. 212-223 More about this Journal
Abstract
For the remediation and restoration of contaminated sediment at the West Sea-Byeong dumping site, dredged materials was dumped in 2013, 2014, 2016, and 2017. The physicochemical properties and benthic fauna in surface sediments of the capping area (5 stations) and natural recovery area (2 stations) were analyzed annually from 2014 to 2020 to evaluate the capping effect of the dredged materials. The natural recovery area had a finer sediment with a mean particle size of 5.91-7.64 Φ, while the sediment in the capping area consisted of coarse-grained particles with a mean particle size of 1.47-3.01 Φ owing to the capping effect of dredged materials. Considering that the contents of organic matters (COD, TOC, and TN) and heavy metals in the capping area are approximately 50 % lower (p<0.05) than that in the natural recovery area, it is judged that there is a capping effect of dredged materials. As a result of analyzing macrobenthic assemblages, the number of species and ecological indices of the capping area were significantly lower than that of the natural recovery area (p<0.05). The number of species and ecological indices at the capping area were increased for the first four years after the capping in 2013 and 2014 and then tended to decrease thereafter. It is presumed that opportunistic species, which have rapid growth and short lifetime, appeared dominantly during the initial phase of capping, and the additory capping in 2016 and 2017 caused re-disturbance in the habitat environment. In the natural recovery and capping areas, Azti's Marine Biotic Index (AMBI) was evaluated as a fine healthy status because it maintained the level of 2nd grades (Good), whereas Benthic Pollution Index (BPI) remained at the 1st and 2nd grade. Therefore, capping of dredged materials for remediation of contaminated sediment in the dumping site has the effect of reducing the pollution level. However, in terms of the benthic ecosystem, it is recommended that the recovery trend should be monitored long-term. Additionally, it is necessary to introduce an adaptive management strategy when expanding the project to remediate the contaminated sediment at the dumping area in the future.
Keywords
Ocean dumping site; Contaminated sediment; Organic matter; Heavy metal; Benthic fauna; Dredged material; Capping effect;
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Times Cited By KSCI : 9  (Citation Analysis)
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