Influence, equilibrium, thermodynamic and kinetic investigations on adsorption of 17beta-estradiol by anaerobic granule sludge

摘要

The effects of adsorbate concentration, adsorbent concentration, temperature, pH, and ion strength on the 17beta-estradiol (E2) adsorption process by anaerobic granular sludge (AnGS) were investigated in this study. The adsorption process was analyzed according to adsorption isotherm, adsorption thermodynamics and adsorption kinetics. It was found that E2 was quickly and effectively adsorbed by AnGS. The adsorption capacity and adsorption removal efficiency of E2 increased as E2 concentration increased, and decreased as AnGS concentration increased. Low temperature, low pH, and low ionic strength promoted E2 adsorption by AnGS. The Freundlich absorption isotherm accurately described the E2 adsorption equilibrium process by AnGS and the pseudo-second-order model accurately described the adsorption kinetics. The overall adsorption process of E2 by AnGS was a physical adsorption process of spontaneous heat release controlled both by film diffusion and intraparticle diffusion.