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DOI: https://doi.org/10.4491/eer.2018.395
Effect of oyster shell powder on nitrogen releases from contaminated marine sediment
Md Akhte Khirul1, Beom-Geun Kim1, Daechul Cho2, Gilsun Yoo2, and Sung-Hyun Kwon3
1Department of Ocean System Engineering, College of Marine Science, Gyeongsang National University, Tongyeong 53064, Republic of Korea
2Department of Energy and Environmental Engineering, Soonchunhyang University, Asan 31538, Republic of Korea
3Department of Marine Environmental Engineering, College of Marine Science, Engineering Research Institute (ERI), Gyeongsang National University, Tongyeong 53064, Republic of Korea
Corresponding Author: Sung-Hyun Kwon ,Tel: +82-55-772-9132, Fax: +82-55-772-9139, Email: shkwon@gnu.ac.kr
Received: November 10, 2018;  Accepted: March 15, 2019.
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Nitrogen flux release from organically enriched sediments into overlying water, which may have significantly influence on water quality and increasing continuous eutrophication. The purpose of this study is to evaluate the remediation efficiency of oyster shell powder and its treated product into organically enriched sediment in terms of nitrogen flux, organic matter, chlorophyll-a, pH and dissolved oxygen (DO). The treated oyster shell powder was mainly composed of CaO2. The application of treated oyster shell powder into the sediment has increased the pH, DO and significantly decreased the concentrations of NH4+-N and T-N compared to other basins. On the other hand, nitrate was enriched with the addition of treated oyster powder, an oxygen releasing compound on both phases. Furthermore, chlorophyll-a was found to be increasing with time in the control basin meanwhile it dropped drastically with the addition of treated oyster shell powder, which implied on the repression of algal growth owing to blockage of nitrogen source migrating from the sediment. This study has shown that the treated oyster shell powder was effective to improve sediment-water quality, diminish eutrophication and control harmful algae blooms in a marine environment. Therefore, it is a good reference as an effective environmental remediation agent.
Keywords: Eutrophication | Marine sediment | Nitrification | Oxygen releasing compounds | Oyster shell powder
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