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http://dx.doi.org/10.7837/kosomes.2020.26.7.873

Effects of Particle Size and Pyrolysis Temperature of Oyster Shell on Change of Coastal Benthic Environment  

Jeong, IlWon (Department of Ocean Engineering, Pukyong National University)
Woo, Hee-Eun (Department of Ocean Engineering, Pukyong National University)
Lee, In-Cheol (Department of Ocean Engineering, Pukyong National University)
Yoon, SeokJin (Dokdo Fisheries Research Center, National Institute of Fisheries Science)
Kim, Kyunghoi (Department of Ocean Engineering, Pukyong National University)
Publication Information
Journal of the Korean Society of Marine Environment & Safety / v.26, no.7, 2020 , pp. 873-880 More about this Journal
Abstract
After pre-treatment of oyster shells according to particle size (0 ~ 1, 1 ~ 2, 2 ~ 5 mm) and pyrolysis temperature (400(P400), 500(P500), 600(P600), 800(P800)℃), changes in the properties of sediments mixed with pre-treated oyster shells were investigated. The primary component of the oyster shell was changed from CaCO3 to CaO at temperatures above 700℃. The Ca2+ concentration in P800 was 790 mg/L, which was 2 ~ 3 times higher than those in the control and other experimental samples. Ca2+ elution significantly increased at the pyrolysis temperature over than 600℃. In oyster shells pyrolyzed over 600℃, the pH of the pore water increased by 0.1 ~ 0.5, due the hydrolysis of CaO formed by the pyrolysis of CaCO3. The PO4-P of the overlying and pore water in P600 and P800 were 0.1 ~ 0.2 mg/L lower than those of the control. The increased pH and elution of Ca2+ from oyster shells should suppress the upwelling of PO4-P from the sediment. Based on the above results, it was confirmed that the pyrolysis temperature of oyster shells influenced NH3-N and PO4-P concentrations in the sediment; however, the particle size of oyster shells had little effect. The results of this study can be used as a foundation for research on the use of pyrolyzed oyster shells to improve low-contamination coastal benthic environments.
Keywords
Oyster shell; Contaminated sediment; Pyrolysis temperature; Particle size; Nutrients;
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Times Cited By KSCI : 5  (Citation Analysis)
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