The Effect Of Distribution On Phosphorus In Flowing Water By Sediment

The sediment movement have important influence on phosphorus.The influence mainly manifests as the adsorption and desorption behaviors of phosphorus onto sediment particles.The spatial and temporal variation process of phosphorus movement can be correctly simulated only if the adsorption and desorption effects has been reasonably considered.Therefore,the phosphorus adsorption and desorption behaviors ontu sediment particles,especially the effects of flow turbulence were investigated through experiments and numerical simulations in the present dissertation.In order to simulate the flow state of natural river,this present take the circular open channel model. based on sediment together with the systems involved in the water cycle,i analyze and use sediment adsorption theory explains the different sediment grain size, sediment concentration, the initial concentration of soluble phosphorus under conditions of adsorption processes of sediment and phosphorus in water,then simulate Elovich equation and second-order kinetic equation. Comparison of the existing shake flask experiments and the open channel experiments on model test differences in test results and simulation dynamics equations.The main results of this research in the following areas:In the prcess of suspended sediment adsorp phosphorus,with the phosphorus concentration in the aqueous phase decreases,the amount of sediment adsorp phosphorus increases,and their rate of change in the initial segment of adsorption is larger,and then gradually decreases and finally reach the dynamic equilibrium in water phase and sediment phase.The smaller is the sediment size,the more is the extreme adsorption amount of phosphorous.With the increase of sediment concentration the amount of phosphorous adsorbed by suspended sediment increase.With the same condition of the initial phosphorous concentration,when the amount of sediment increase there have the existence of a downward trend in the capacity per unit mass of sediment adsorp phosphorus. Although the amount that the unit mass of sediment adsorp phosphoru on the equilibrium capacity increases with the sediment concentration decrease, but instead with the adsorption content increase with the concentration of sediment.This property will contribute to the self-purification and environment capacityAt the same sediment concentration, different initial concentrations of phosphorus, phosphorus adsorption capacity increased with the initial concentration of phosphorus increases. But with the increase of initial concentration of phosphorus, phosphorus adsorption accounted for an increasing proportion of low initial phosphorus. Conclusions show that the adsorption of phosphorus is works for water self-purification when there have phosphorus discharged into a water body, but with the increase in the concentration of phosphorus in water, the effect of this self-purification will be more limited.In this paper, the open channel experiment, each group equilibration times were about 2h.In open channel model simulation of sediment adsorp phosphorus kinetics, although Elovich equation simulated correlation are around 0.9, but there is still a big difference with the actual curve, and second-order equation can suitable simulate open channel model sediment phosphorus adsorption kinetics. In contrast, on the river in case of actual distribution of phosphorus, the two kinetic equations have better guidance.