Prediction of multicomponent adsorption behavior in activated carbon adsorbers: kinetic aspects.
Although the concentrations of solutes are very low in water treatment, it cannot be expected that the film-diffusion model predicts breakthrough behavior satisfactorily, for the following reasons: most of the solutes have less favorable isotherms than p-nitrophenol or p-chlorophenol; many solutes are much larger molecules and hence have a much higher internal diffusion resistance than p-nitrophenol or p-chlorophenol; and displacement effects cause a much higher internal resistance than expected from single-solute data. Therefore, internal diffusion resistance has to be incorporated into the film-homogeneous diffusion model. All parameters needed in this model can be obtained from batch reactor tests. Multi-solute systems may be regarded as a single-solute system or a bi-solute system, respectively, if all solutes except one or two are present in very different concentrations; and/or have a comparatively small affinity to activated carbon; and/or have a comparatively small internal diffusion coefficient.
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D000327:Adsorption; D002244:Carbon; D004058:Diffusion; D005374:Filtration / Q000592:standards*; D006838:Hydrocarbons; D007700:Kinetics; D014873:Water Pollutants; D014881:Water Supply
D006838:Hydrocarbons; D014873:Water Pollutants; D002244:Carbon