三峡库区泥沙对磷吸附热力学实验及模型研究

利用三峡库区原状水沙开展泥沙吸附磷的热力学实验,以获得泥沙吸附磷的热力学方程和临界平衡磷浓度(EPC0)。结果表明,吸附平衡时磷在水沙之间的分配关系符合Langmuir吸附等温式,并且不同泥沙含量对应于不同的等温式。基于实验数据,对传统的Langmuir吸附等温式进行了改进,建立了反映泥沙含量影响的吸附等温式,并且得到了河流原型观测数据的验证。基于实验数据得到不同泥沙含量相应的临界平衡磷浓度,结果显示相同泥沙背景吸附条件下的EPC0同样与泥沙含量相关。

Experiment and Modelling of Adsorption of Phosphorus to Sediment in the Three Gorges Reservoir

The experiment of phosphorus adsorption to sediment using the original water and sediment in the Three Gorges Reservoir is carried out to obtain the equilibrium equation and Equilibrium Phosphorus Concentrations(EPC0).The experiment results show that the Langmuir equilibrium equation can well describe the distribution of phosphorus between water and sediment,with different parameters for different sediment concentrations.The traditional Langmuir equilibrium equation is modified to reflect the effects of sediment concentration according to the experiment data,and the equilibrium equation in this research is validated by field data in the Three Gorges Reservoir.The equilibrium phosphorus concentrations corresponding to a series of sediment concentrations are obtained from the experiment data.It is showed that the EPC0 are also correlated with sediment concentrations for the same adsorption background value.