Experimental Investigation of the Effect of Flow Turbulence on the Adsorption of Phosphorus onto Sediment Particles

Abstract:

The mechanism of flow turbulence, sediment concentration and sediment grain size that effect the adsorption of phosphorus (P) onto sediment particles in natural waters are experimentally studied both in batch reactors and in an oscillating grid turbulence simulation device. In batch reactor experiments, both of phosphorus sorption isotherms and phosphorus sorption kinetics were studied, and the experimental data was fitted by Langmuir sorption model. The results indicated that both of the phosphorus sorption capacity and phosphorus sorption efficiency are closely related to sediment concentration and sediment grain size. In the oscillating grid turbulence simulation device, it is possible to control the turbulence intensity in two ways, by changing the frequency of the grid and controlling the oscillating stroke. According to this characteristic, the effect of flow turbulence on the adsorption of phosphorus onto sediment particles was experimentally simulated. Then a 1DV model is introduced in this paper to simulate sediment transport and phosphate sorption kinetics process.

• Periodical: Applied Mechanics and Materials (Volumes 212-213)
• Pages: 299-306
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.212-213.299
• Online since: October 2012
• Authors: Bo Xia, Qing He Zhang, Jing Si Yang, Chang Bo Jiang
• Keywords: Numerical Model, Phosphorus Sorption Isotherm, Phosphorus Sorption Kinetics, Turbulence Intensity

References

[1] Appan A., Wang H. Sortion isotherms and kinetics of sediment phosphorus in a tropical reservoir. Journal of Environ. Eng. -ASCE, Vol. 126, No. 11, 996-998 (2000).

DOI: 10.1061/(asce)0733-9372(2000)126:11(993)

[2] De Silva, I.P.D., Fernando, H.J.S. Some aspects of mixing in a stratified turbulent patch. Journal of Fluid Mechanics 240, 601–625 (1992).

DOI: 10.1017/s0022112092000223

[3] Gomez E, Durillon C, Rofes G, et al. Phosphate adsorption and release from sediments of brackish lagoons: pH, O2 and loading influence . Water Res, 33(10) : 2437-2447 (1999).

DOI: 10.1016/s0043-1354(98)00468-0

[4] Hopfinger E J, Toly J A. Spatially decaying turbulence and its relation to mixing across density interfaces. Journal of Fluid Mechanics, 78(1): 155-175 (1976).

DOI: 10.1017/s0022112076002371

[5] Jin X. C, Wang S. R, Pang Y. etal. Phosphorus fractions and the effect of pH on the phosphorus release of the sediments from different trophic areas in Taihu Lake, China. Environmental Pollution (2006).

DOI: 10.1016/j.envpol.2005.05.010

[6] Medina p, Sánchez MA, Redondo J M. Grid stirred turbulence: applications to the initiation of sediment motion and lift-off studies[J]. Phys. Chem. Earth, 26(4): 299-304 (2000).

DOI: 10.1016/s1464-1909(01)00010-7

[7] Michallet, H., Mory, M. Modelling of sediment suspensions in oscillating grid turbulence. Fluid Dynamics Research, 35(2): 87-106 (2004).

DOI: 10.1016/j.fluiddyn.2004.04.004

[8] N. Matsunaga, Y. Sugihara, T. Komatsu, et al. Quantitative properties of oscillating-grid turbulence in a homogeneous fluid. Fluid Dynamics Research, 25: 147-165 (1999).

DOI: 10.1016/s0169-5983(98)00034-3

[9] Rodi, W. Turbulence models and their applications in hydraulics a state-of-the-art review. IAHR monograph, Delft (1984).

[10] Wang, S. , Jin, X. , Zhao, H. , Wu, F. . Phosphorus fractions and its release in the sediments from the shallow lakes in the middle and lower reaches of Yangtze River area in China. Colloids and Surfaces (2006).

DOI: 10.1016/j.colsurfa.2005.08.015

[11] Winterwerp, J.C. On the 6occulation and settling velocity of estuarine mud. Cont. Shelf Res. 22, 1339–1360 (2002).

DOI: 10.1016/s0278-4343(02)00010-9