泥沙吸附重金属污染物的数值模拟研究.

In order to study the heavy metal pollutant adsorption of sediment under the phase-separation model, based on the Langmuir isothermal equation, the sediment and heavy metal phases were regarded as two phases and the adsorption process was numerically simulated through two calculation methods: time-step method and UDS method. Firstly, the sediment adsorption process under seven turbulence models was simulated by combining component transport model with UDF using commercial software fluent. The results were compared with the Langmuir model, the feasibility of the method was verified and the model with the highest consistency was selected. Secondly, the adsorption capacity of sediment particles under different sediment concentration and particle size were obtained by using the selected model. And the change trend of cadmium ion concentration in aqueous phase was simulated. The results show that the sediment concentration directly affects the adsorption of water, the smaller the concentration, the weaker the adsorption, the slower the adsorption rate is, the less the concentration is and the less the adsorption can be. The adsorption effect of sediment particle size in water is obvious, but it cannot determine the amount of sediment adsorption. Both UDS and time-step methods have advantages and disadvantages in calculating the adsorption amount under the influence of particle size. The results of the dynamic time obtained by the stepwise method are more appropriate and the numerical results of the adsorption amount obtained by the time-step method are in better agreement with each other. [ABSTRACT FROM AUTHOR]