Experimental and kinetic study of mercury adsorption on various activated carbons in a fixed bed adsorber.

摘要

This field study investigated experimentally and theoretically the characteristics of mercury sorption by activated carbon. Experiments were carried out in a fixed-bed adsorber enclosed in a furnace. An on-line Atomic Absorption Spectrophotometer was used for mercury measurements. The proposed sorption model involved the coupling of a kinetic model based on the mechanisms of surface equilibrium and external mass transfer, and a material balance model based on the tank-in-series approach. Three different surface equilibrium expressions were used in the model, i.e., the Henry's Law, the Langmuir isotherm and the Freundlich isotherm. In addition to kinetic simulations using the developed model, a thermodynamic equilibrium model was also used to simulate the thermodynamically preferred mercury species under the experimental conditions.