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Article

Phosphorus Release from Sediments in a Raw Water Reservoir with Reduced Allochthonous Input

by 1,2,*, 3, 2, 4, 5, 3, 6 and 3
1
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
2
Tianjin Academy of Eco-Environmental Sciences, Tianjin 300191, China
3
Tianjin Huanke Environmental Consulting Co., Ltd., Tianjin 300191, China
4
Beijing Key Laboratory of Urban Hydrological Cycle and Sponge City Technology, College of Water Sciences, Beijing Normal University, Beijing 100875, China
5
Center for Biogeochemistry of the Anthropocene, Department of Chemistry, University of Oslo, N-0315 Oslo, Norway
6
School of Earth System Science, Tianjin University, Tianjin 300072, China
*
Author to whom correspondence should be addressed.
Academic Editors: Guilin Han and Zhifang Xu
Water 2021, 13(14), 1983; https://doi.org/10.3390/w13141983
Received: 9 June 2021 / Revised: 16 July 2021 / Accepted: 16 July 2021 / Published: 19 July 2021
Following successful abatement of external nutrient sources, one must shift the focus to the role of phosphorus (P) release from sediment. This enables us to better assess the causes for sustained eutrophication in freshwater ecosystem and how to deal with this challenge. In this study, five sediment cores from the shallow YuQiao Reservoir in northern China were investigated. The reservoir serves as the main raw water source for tap water services of Tianjin megacity, with a population of 15.6 million. Sediment characteristics and P fractions were determined in order to assess the role of the sediments as the P source to the water body. The total P content (TP) in sediments was similar to what was found in catchment soils, although the P sorption capacity of sediments was 7–10 times greater than for the catchment soils. Isotherm adsorption experiments documented that when P concentration in overlying water drops below 0.032–0.070 mg L−1, depending on the site, the sediment contributes with a positive flux of P to the overlying water. Adsorbed P at different depths in the sediments is found to be released with a similarly rapid release rate during the first 20 h, though chronic release was observed mainly from the top 30 cm of the sediment core. Dredging the top 30 cm layer of the sediments will decrease the level of soluble reactive phosphate in the water being sustained by the sediment flux of P. View Full-Text
Keywords: phosphorus release; internal P source; desorption P; abatement action; YuQiao Reservoir phosphorus release; internal P source; desorption P; abatement action; YuQiao Reservoir
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MDPI and ACS Style

Zhou, B.; Fu, X.; Wu, B.; He, J.; Vogt, R.D.; Yu, D.; Yue, F.; Chai, M. Phosphorus Release from Sediments in a Raw Water Reservoir with Reduced Allochthonous Input. Water 2021, 13, 1983. https://doi.org/10.3390/w13141983

AMA Style

Zhou B, Fu X, Wu B, He J, Vogt RD, Yu D, Yue F, Chai M. Phosphorus Release from Sediments in a Raw Water Reservoir with Reduced Allochthonous Input. Water. 2021; 13(14):1983. https://doi.org/10.3390/w13141983

Chicago/Turabian Style

Zhou, Bin, Xujin Fu, Ben Wu, Jia He, Rolf D. Vogt, Dan Yu, Fujun Yue, and Man Chai. 2021. "Phosphorus Release from Sediments in a Raw Water Reservoir with Reduced Allochthonous Input" Water 13, no. 14: 1983. https://doi.org/10.3390/w13141983

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