Removal of benzalkonium chloride by polymeric adsorbents
نویسندگان
چکیده
Removal of benzalkonium chloride (BKC) from aqueous streams by polymeric resins XAD-7 and XAD-16 was investigated. Adsorption equilibrium isotherms of BKC from water were measured in a batch adsorber at different temperatures and ionic strengths of the external phase. In addition, the influence of an organic solvent (ethanol) on the phase equilibrium was studied. The experimental data was correlated with the Langmuir isotherm, and thermodynamic parameters for adsorption process were determined. Mass transfer kinetics were investigated in a batch adsorber and correlated with a Fickian diffusion model. Finally, removal of BKC in an adsorption column and regeneration of the column was investigated. It was found that a threestep process is necessary: after break-through, the column could be efficiently regenerated only with an aqueous ethanol solution (20% – 50% EtOH), followed by a short washing stage.
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