~(14)C-MIB adsorption on PAC in natural water

摘要

Kinetic and equilibrium studies using five powdered activated carbons (PACs) and ~(14)C-labeled 2-methylisoborneol (MIB) in Lake Michigan water produced guidelines for determining the dose of PAC needed to remove MIB. The equilibrium data, supported by predictions from the equivalent background compound competitive adsorption model, indicate that the percent MIB remaining at equilibrium is a function of the carbon dosage, independent of the initial MIB concentration. Kinetic experiments, analyzed in terms of the homogeneous surface diffusion model, demonstrated that the surface diffusion coefficient, D_s, is independent of both carbon dosage and initial MIB concentration. Together these equilibrium and kinetic studies show that for any given PAC dosage in natural water and for any fixed time of contact, the percent MIB remaining in an ideal reactor is independent of the initial MIB concentration. Thus the PAC dosage required to mitigate any MIB episode for any contact time of interest may be quickly determined from a C_t/C_0 x 100 percent versus C_c plot. These studies have also exhibited a new application of ~(14)C-MIB allowing for the rapid collection of reproducible and accurate adsorption data.