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Effect of aggregation on the adsorption of phosphorus onto air-dried sediment in contrasting shear flow conditions

  • Sediments, Sec 2 • Physical and Biogeochemical Processes • Research Article
  • Published:
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Abstract

Purpose

Fine sediments are usually collected in situ and air-dried for adsorption experiments, which may lead to particle aggregation and thus have a significant effect on phosphorus (P) adsorption under dynamic conditions. The main purpose of this study was to investigate the changes of aggregates due to drying with shear stress and the effects on the adsorption of P onto air-dried sediments under different shear rates after re-wetting.

Materials and methods

Sediment samples were collected from an alluvial river. Fine wet sediments (<31 μm) were wet-sieved and air-dried, and some air-dried sediments were further sonicated and served as the control. The grain size distribution of the three sediment samples (wet, dried, and sonicated) was measured to evaluate the particle aggregation level. The P sorption capacity of wet and dried sediments was determined by batch equilibrium experiments. The change of aggregate size with shear stress was investigated for dried and sonicated sediments. Sorption equilibrium experiments were performed to investigate the effect of shear stress on the P sorption with and without change of particle aggregation level, respectively.

Results and discussion

Fine particles agglomerated into larger aggregates during the drying process, resulting in a significant increase in the aggregate size. The sorption capacity was lower in aggregated sediment than in original wet sediment. Aggregate size in dried sediment decreased with the increase of shear rate, leading to an increase in the surface area and available adsorption sites, whereas the particle size of sonicated sediment was hardly affected. Accordingly, the P sorption amount of dried sediment increased with increasing shear rate, whereas that of sonicated sediment showed no significant change with shear rate after all sediments were suspended. There was a significant curvilinear correlation between aggregate size and P sorption amount for dried sediments, thus indicating that the P sorption amount increased significantly with decreasing aggregate size.

Conclusions

Sediment aggregation is an important factor affecting P adsorption besides the amount of suspended sediments and the exchange between suspended and bed sediments under dynamic conditions. The P equilibrium adsorption amount increases with shear stress for air-dried sediment. The effect of particle aggregation on the amount of P sorbed onto sediments should not be ignored, and thus, more attention should be paid to the pretreatment of sediment samples in the sorption experiments under dynamic conditions.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 51239003, 51509073, and 51409085), and special thanks for the help of Huaihe River Basin Water Resource Protection Bureau.

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Authors and Affiliations

  1. College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, China

    Hongwu Tang, Qingxia Li, Saiyu Yuan & Zhiwei Li

  2. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing, China

    Hongwu Tang

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  1. Hongwu Tang
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  2. Qingxia Li
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  3. Saiyu Yuan
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  4. Zhiwei Li
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Correspondence to Hongwu Tang.

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Tang, H., Li, Q., Yuan, S. et al. Effect of aggregation on the adsorption of phosphorus onto air-dried sediment in contrasting shear flow conditions. J Soils Sediments 17, 2177–2186 (2017). https://doi.org/10.1007/s11368-017-1681-9

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  • DOI: https://doi.org/10.1007/s11368-017-1681-9

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