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Sustainability 2017, 9(8), 1429; doi:10.3390/su9081429

Impact of Salinity Change on Water Quality Variables from the Sediment of an Artificial Lake under Anaerobic Conditions

1
Department of Environmental Application Science, Kyung Hee University, Yongin-si 17104, Korea
2
School of Earth, Environmental, and Marine Sciences, University of Texas Rio Grande Valley, Edinburg, TX 78539, USA
3
Department of Water Supply and Sewerage, Saman Corporation, Gwacheon-si 13837, Korea
4
Department of Civil and Environmental Engineering, 222 Wangsimni Ro, Hanyang University, Seoul 04736, Korea
*
Authors to whom correspondence should be addressed.
Received: 24 June 2017 / Revised: 28 July 2017 / Accepted: 9 August 2017 / Published: 12 August 2017
(This article belongs to the Special Issue Sustainable Water Resources Management)
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Abstract

Artificial reservoirs are created by dike construction in coastal areas to secure the agricultural water supply on the west coast of South Korea. These systems are found to retain brackish characteristics until total desalination is achieved. To evaluate the effects of salinity on the organic substances released from the sediment, a laboratory water-sediment column experiment was conducted to assess associated changes in water quality variables such as the sediment oxygen demand (SOD), chemical oxygen demand (COD), and concentrations of nitrogen (N) and phosphorus (P). Under high salinity conditions, the release of N from the sediment was promoted with the enhancement of SOD and COD. This trend was accounted for by the response of the microorganisms (cell breakdown of algae and suppression of metabolic activity). Our results suggest that chemicals (N, P, and COD) released from sediment and its overall impact on the water quality of a brackish lake should vary depending on the temporal and spatial dynamics of the salinity. View Full-Text
Keywords: agricultural lake; organic substances; salinity; sediment oxygen demand agricultural lake; organic substances; salinity; sediment oxygen demand
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Kim, T.-H.; Kang, J.H.; Kim, S.H.; Choi, I.-S.; Chang, K.-H.; Oh, J.M.; Kim, K.-H. Impact of Salinity Change on Water Quality Variables from the Sediment of an Artificial Lake under Anaerobic Conditions. Sustainability 2017, 9, 1429.

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