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Open AccessArticle

Sorption Properties of the Bottom Sediment of a Lake Restored by Phosphorus Inactivation Method 15 Years after the Termination of Lake Restoration Procedures

1
Department of Water Protection Engineering, University of Warmia and Mazury in Olsztyn, Prawocheńskiego St. 1, 10-720 Olsztyn, Poland
2
Laboratory of Hydroacoustics, Inland Fisheries Institute, Oczapowskiego St. 10, 10-719 Olsztyn, Poland
*
Author to whom correspondence should be addressed.
Water 2019, 11(10), 2175; https://doi.org/10.3390/w11102175
Received: 3 September 2019 / Revised: 16 October 2019 / Accepted: 17 October 2019 / Published: 19 October 2019
(This article belongs to the Special Issue Lake and River Restoration: Method, Evaluation and Management)
Artificial mixing and phosphorus inactivation methods using aluminum compounds are among the most popular lake restoration methods. Długie Lake (Olsztyńskie Lakeland, Poland) was restored using these two methods. Primarily, P precipitation and inactivation methods significantly increased the sorption properties of Długie Lake bottom sediment. Fifteen years after the termination of the restoration procedure, the alum-modified “active” sediment layer still has higher P adsorption abilities, which can limit P internal loading. Relatively low amounts of phosphates in the near-bottom water of Długie Lake, even in anoxia, as well as the fact that the assessed maximum sediment P sorption capacity is still higher than NH4Cl–P (labile P) and BD–P (Fe-bound P) sum (“native exchangeable P”), confirm that hypothesis. Among the tested P adsorption models for the sediment, the double Langmuir model showed the best fit to the experimental data (the highest R2 values). This may indicate that phosphorus adsorption by the tested sediments most likely occurs through phosphate binding at two types of active sorption sites. P adsorption by the studied lake sediment during experiments was significantly connected to aluminum content in sediment. The research into the adsorption properties of sediment can be used as a tool for the evaluation of lake restoration effects. View Full-Text
Keywords: lake; sediment; phosphorus sorption; lake restoration; phosphorus inactivation; artificial mixing lake; sediment; phosphorus sorption; lake restoration; phosphorus inactivation; artificial mixing
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Augustyniak, R.; Grochowska, J.; Łopata, M.; Parszuto, K.; Tandyrak, R.; Tunowski, J. Sorption Properties of the Bottom Sediment of a Lake Restored by Phosphorus Inactivation Method 15 Years after the Termination of Lake Restoration Procedures. Water 2019, 11, 2175.

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