Predicting the Multicomponent Removal of Surrogate Compounds by a Fixed‐Bed Adsorber

Abstract

Pore and surface diffusion mass transfer models were used to predict the breakthrough profiles of a 14‐component mixture eluting from a point‐of‐use fixed‐bed adsorber. The 14 compounds were surrogates, representing a variety of organics from different classes and groups commonly found in contaminated drinking water. Adsorption isotherms were done for all 14 compounds. Polanyi adsorption potential theory was used to correlate single‐solute isotherm parameters at 21°C and predict isotherm parameters at 6°C. Ideal adsorbed solution theory was used in the mass transfer models to correlate the single‐solute predicted isotherms at 6°C and calculate competitive interactions at the surface of the activated carbon.

Correlation of Aqueous-Phase Adsorption Isotherms

“…Table displays some of the correlations that have been proposed. Most correlations are based either on Polanyi adsorption potential theory ( − ) or linear solvation energy relationships (LSERs) ( , ). Previous researchers using the Polanyi theory approaches have focused on finding the most appropriate normalizing factor ( − ).…”

Removing lead in drinking water with activated carbon

“…The technique has good agreement with the use of organic compounds with activated carbon [37]. The technique has good agreement with the use of organic compounds with activated carbon [37].…”

“…In summary, small scale studies are conducted on an accelerated basis by using carbon with a reduced particle size. The technique has good agreement with the use of organic compounds with activated carbon [37].…”

“…Kuennen et al in an earlier publication detailed the testing of lead reduction by a POU-GAC-FBA under a variety of water conditions, with a pH range of 5-8.5 [37]. The competition for sites on the carbon surface is a factor that has to be taken into account when removing a metal from water.…”

“…Fortunately, lead is more tightly retained than many of the other metals that may be found in drinking water in the pH range of 6.5 to 8.5. Kuennen et al in an earlier publication detailed the testing of lead reduction by a POU-GAC-FBA under a variety of water conditions, with a pH range of 5-8.5 [37]. The POU-GAC-FBA used for the studies was composed of a pressed carbon block, with five stages of filtration and had a rated life of 500 gallons.…”