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Article

Effects of Lanthanum Modified Bentonite and Polyaluminium Chloride on the Environmental Variables in the Water and Sediment Phosphorus Form in Lake Yanglan, China

1
Institute of Hydrobiology and Department of Ecology, Jinan University, Guangzhou 510632, China
2
China Gezhouba Group Water Operation Company LTD, Wuhan 430033, China
3
Beisun Environmental Technology Company LTD, Guangzhou 510623, China
4
State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
*
Author to whom correspondence should be addressed.
Academic Editor: Gang Pan
Water 2021, 13(14), 1947; https://doi.org/10.3390/w13141947
Received: 21 May 2021 / Revised: 1 July 2021 / Accepted: 8 July 2021 / Published: 15 July 2021
(This article belongs to the Special Issue Ecosystem-Based Understanding and Management of Eutrophication)
The application of lanthanum modified bentonite (Phoslock®) and polyaluminium chloride (PAC) is popular in the restoration of European temperate lakes; however, the effects of the application on the concentrations of phosphorus (P) in both the water and the sediments have been poorly evaluated to date. We studied the effects of the application of Phoslock® + PAC on the concentrations of total phosphorus (TP), particulate phosphorus (PP), soluble reactive phosphorus (SRP), total suspended solids (TSS) and chlorophyll a (Chla) in the water, and different P forms in the sediments, in an isolated part of Lake Yanglan. The results showed that the concentrations of TP, PP, SRP, TSS and Chla decreased significantly after the addition of Phoslock® + PAC. Moreover, the concentrations of labile-P, reductant-soluble-P and organic-P in the sediments were also significantly decreased after the Phoslock® + PAC application. However, the concentrations of both the stable apatite-P and residual-P in the sediments after application of Phoslock® + PAC were much higher than the pre-addition values, while the concentrations of metal-oxide-P did not differ significantly between the pre- and post- application conditions. Our findings imply that the combined application of Phoslock® and PAC can be used in the restoration of subtropical shallow lakes, to reduce the concentrations of P in the water and suppress the release of P from the sediments. View Full-Text
Keywords: lake restoration; lanthanum-modified bentonite; polyaluminium chloride; sediment phosphorus forms; water quality lake restoration; lanthanum-modified bentonite; polyaluminium chloride; sediment phosphorus forms; water quality
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MDPI and ACS Style

Su, L.; Zhong, C.; Gan, L.; He, X.; Yu, J.; Zhang, X.; Liu, Z. Effects of Lanthanum Modified Bentonite and Polyaluminium Chloride on the Environmental Variables in the Water and Sediment Phosphorus Form in Lake Yanglan, China. Water 2021, 13, 1947. https://doi.org/10.3390/w13141947

AMA Style

Su L, Zhong C, Gan L, He X, Yu J, Zhang X, Liu Z. Effects of Lanthanum Modified Bentonite and Polyaluminium Chloride on the Environmental Variables in the Water and Sediment Phosphorus Form in Lake Yanglan, China. Water. 2021; 13(14):1947. https://doi.org/10.3390/w13141947

Chicago/Turabian Style

Su, Ling, Chen Zhong, Lei Gan, Xiaolin He, Jinlei Yu, Xiumei Zhang, and Zhengwen Liu. 2021. "Effects of Lanthanum Modified Bentonite and Polyaluminium Chloride on the Environmental Variables in the Water and Sediment Phosphorus Form in Lake Yanglan, China" Water 13, no. 14: 1947. https://doi.org/10.3390/w13141947

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