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

Water

Xiaolin He¹  Chen Zhong²  Zhengwen Liu³  Ling Su³  Lei Gan³  Jinlei Yu⁴  Xiumei Zhang⁴ 

[1] Beisun Environmental Technology Company LTD, Guangzhou 510623, China;China Gezhouba Group Water Operation Company LTD, Wuhan 430033, China;Institute of Hydrobiology and Department of Ecology, Jinan University, Guangzhou 510632, China;State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China;

关键词: lake restoration;    lanthanum-modified bentonite;    polyaluminium chloride;    sediment phosphorus forms;    water quality;   

DOI  :  10.3390/w13141947

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown