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DOI: https://doi.org/10.4491/eer.2018.360
Behaviors of nitrogen, iron and sulfur compounds in contaminated marine sediment
Md Akhte Khirul1, Daechul Cho2, 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: October 15, 2018;  Accepted: April 22, 2019.
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ABSTRACT
The marine sediment sustains from the anoxic condition due to increased nutrients of external sources. The nutrients are liberated from the sediment, which acts as an internal source. In hypoxic environments, anaerobic respiration results in the formation of several reduced matters, such as N2 and NH4+, N2O, Fe2+, H2S, etc. The experimental results have shown that nitrogen and sulfur played an influential, notable role in this biogeochemical cycle with expected chemical reductions and a ‘diffusive’ release of present nutrient components trapped in pore water inside sediment toward the bulk water. Nitate/ammonium, sulfate/sulfides, and ferrous/ferric irons are found to be the key players in these sediment-waters mutual interactions. Organonitrogen and nitrate in the sediment were likely to be converted to a form of ammonium. Reductive nitrogen is called dissimilatory nitrate reduction to ammonium and denitrification. The steady accumulation in the sediment and surplus increases in the overlying waters of ammonium strongly support this hypothesis as well as a diffusive action of the involved chemical species. Sulfate would serve as an essential electron acceptor so as to form acid volatile sulfides in present of Fe3+, which ended up as the Fe2+ positively with an aid of the residential microbial community.
Keywords: Denitrification | Eutrophication | Hypoxia | Nitrogen release | Nutrient
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