Application of an effective method in predicting breakthrough curves of fixed-bed adsorption onto resin adsorbent

Comparison of PoraPak Rxn RP and XAD-2 adsorbents for monitoring dissolved hydrophobic organic contaminants

“…7). This observation has been reported previously (Pan et al 2005;Juang and Shiau 1999) and indicates that surface resistance decreases at higher concentrations probably because of increased sorption intensity at higher C F .…”

“…The constant-pattern wave approach A detailed description of the wave propagation theory and mathematical derivations of the governing equations describing the breakthrough curves of an aqueous solution of organic contaminant in a fixed bed have been previously described Chien 2001, 2002;Pan et al 2005;Zhang et al 2010;Zhang et al 2011). Briefly, assuming ideal plug flow, no chemical reactions, negligible radial and axial dispersion, and uniform temperature and flow rate, the final equation describing the breakthrough curve of an organic contaminant is given as follows:…”

“…These compounds were selected because they represent a diverse set of environmentally relevant organic pollutants with different physical-chemical properties and satisfactory ultraviolet-visible (UV-VIS) absorption properties. The breakthrough behavior of selected compounds captured onto PPR resin was modeled using the constant-pattern wave model Chien 2001, 2002;Pan et al 2005;Zhang et al 2010;Zhang et al 2011). Through predictive modeling based on laboratory data and the constant-pattern wave approach, a scale-up of laboratory parameters to typical field sampling conditions was performed.…”

Mathematically modeling fixed-bed adsorption in aqueous systems

“…Luckily, the constant pattern theory including the "wave" velocity offers another approach to predict the breakthrough curve. When one assumes that a self-sharpening wave moves at a constant rate in column, τ, the adjusted time, can be represented as (Chern and Chien, 2002;Pan et al, 2005) .…”

Combined wall and thermal effects during non-isothermal packed bed adsorption

“…Hence, for relatively small D/d p ratio the tube wall has a considerable influence on porosity, fluid flow, heat transfer and mass transfer in the bed. Moreover, it should be pointed out that identified limitations of existing literature on modelling adsorption in highly loaded, wall-cooled packed beds refer primarily to simplifying assumptions like isothermal operation [11], specific types of adsorption equilibrium [12][13][14], constant pattern behaviour [13,15], neglecting the resistance of mass transfer [16,17], or the use of lumped, overall coefficients for fluid-to-particle mass transfer [3,18].…”