Using sediment resuspension to immobilize sedimentary phosphorus
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RESEARCH ARTICLE
Using sediment resuspension to immobilize sedimentary phosphorus Xue Geng 1 & Dapeng Li 1
&
Chutian Xu 1 & Peirong Sun 1
Received: 6 May 2020 / Accepted: 23 August 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The response of the transformation of internal phosphorus (P) to resuspended sediment was investigated in the sediment-water system under different disturbance intensity. The sediments and overlying water were collected from Taihu Lake, a typical shallow lake. The concentrations of particulate P (PP) and dissolved inorganic P (DIP) in the water phase and algal available P (AAP) and P fractions in the sediments and suspended particle characteristics were evaluated in laboratory-simulated experiments. The results show that dissolved oxygen (DO) in the overlying water increased continuously and pH decreased slightly under sediment resuspension. The concentration of ammonia nitrogen (NH4+-N) showed a distinct decline, indicating that sediment resuspension promotes the penetration of DO into the sediments. It was also favor of the formation of metal oxides and hydroxides, inducing soluble amorphous metal compounds oxidized to insoluble crystalline metal compounds under disturbance condition. This resulted in the increase of refractory P in sediment compared with the static conditions. Sediment resuspension is beneficial to long-term P retention. This can be confirmed by the increase of maximum P adsorption amount (Qmax) and the decrease of the degree of P saturation (DPS) and equilibrium P concentration (EPC0). This is the main explanation of DIP decrease in the overlying water. It is indicating that sediment resuspension not only improves the redox environment in the sediment-water system but also enhances P retention capacity. Keywords Sediment resuspension . Phosphorus fractions . Disturbance . Phosphorus retention capacity . Taihu Lake
Introduction Owing to excessive load of nutrients discharged from human and natural activities, as an irreversible water quality problem, eutrophication has become a global problem, which seriously threatens aquatic ecology and drinking water safety (Jin et al. 2005). As an essential nutrient responsible for the algal bloom, Highlights • Sediment resuspension improved redox environment in the sedimentwater system. • Sediment resuspension played an important role in P loss in the overlying water. • P adsorption capacity changed sharply due to sediment resuspension. • P immobilization was enhanced under sediment resuspension due to the increase of refractory P. Responsible editor: Philippe Garrigues * Dapeng Li [email protected] 1
School of Environmental Science and Technology, Suzhou University of Science and Technology, 99 Xuefu Road, Suzhou, 215009 Jiangsu Province, People’s Republic of China
phosphorus (P) is the major driving force for eutrophication, playing a unique and important role in the eutrophication process. Although the external P was reduced obviously, P concentrations in the overlying water were still maintained
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