Study on seepage and adsorption characteristics of porous media containing adsorbent based on lattice Boltzmann

A double-distribution function Lattice Boltzmann Method (LBM) is used to simulate the seepage and adsorption process of solution flow through porous media with an adsorbent at the pore scale. The accuracy of the model is verified by simulating the interfacial adsorption and intraparticle diffusion processes. The effects of inlet and outlet density difference, inlet concentration, and adsorbent packed bed height on the permeability and adsorption process of two-dimensional porous media with adsorbent are discussed. The numerical simulation results show that the adsorption equilibrium time increases with the increase in inlet and outlet density difference and inlet concentration, and the thicker the adsorption layer, the lower the adsorption rate. The seepage rate increases with the increase in inlet and outlet density difference and the increase in adsorbent packed bed height, but the change in inlet concentration has no effect on it. The flow resistance in the adsorbent particles has a great influence on the mass transfer process, so it should be considered accurately. The LBM model proposed in this paper is an effective tool to study the remediation of seepage pollution in porous media such as soil and groundwater.