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

Sustainability

卷:9

Ki-Hyun Kim¹  I-Song Choi²  Kwang-Hyeon Chang²  Jong Min Oh²  Tae-Hoon Kim²  Sang Hyun Kim³  Ji Hoon Kang⁴ 

[1] Department of Civil and Environmental Engineering, 222 Wangsimni Ro, Hanyang University, Seoul 04736, Korea;

[2] Department of Environmental Application Science, Kyung Hee University, Yongin-si 17104, Korea;

[3] Department of Water Supply and Sewerage, Saman Corporation, Gwacheon-si 13837, Korea;

[4] School of Earth, Environmental, and Marine Sciences, University of Texas Rio Grande Valley, Edinburg, TX 78539, USA;

关键词: agricultural lake;    organic substances;    salinity;    sediment oxygen demand;   

DOI  :  10.3390/su9081429

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown