Factors influencing phosphorus distribution in hydrodynamic water.

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Hanqing Zhao, Hongwu Tang, Zhiwei Li, Qingxia Li, Fei Ji

Friday 3 july 2015

13:00 - 13:03h at North America (level 0)

Themes: (T) Hydro-environment, (ST) Ecohydraulics and ecohydrology, Poster pitches

Parallel session: Poster pitches: 15F. Environment - Ecohydraulic

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Phosphorus (P) has strong affinity to react with suspended sediment particles. Spatial diffusion and exchange among different phases of P happen under the influence of flow-sediment transport. This manuscript investigated P sorption onto suspended sediment with the change of flow velocity (V), initial concentration of dissolved P (C0), and sediment concentration (S) in an extended annular flume. The process of kinetic sorption could be finished within 6 hours, with 80% of P sorbed in the first an hour. The change rule of both P sorption amount per mass of sediment at the time point t (Nt), and sorption amount at equilibrium state (Ne) were negatively associated with V in low P concentration, and positively associated with V in high P concentration. Ne would increase with Co and the decrease of S, while the total amount of P sorption (TAPS) in the experiments would increase with both C0 and S. The Langmuir isotherm adsorption model to describe P sorption in equilibrium condition was better than other equations mentioned in this paper.