A new way of measuring very low concentrations of MIB allows calculation of the PAC dose needed to mitigate odors caused by MIB.
Kinetic and equilibrium studies using five powdered activated carbons (PACs) and 14C‐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, Ds, 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 Ct/C0 × 100 percent versus Cc plot. These studies have also exhibited a new application of 14C‐MIB allowing for the rapid collection of reproducible and accurate adsorption data.
Equilibrium data obtained from a natural water with several different initial concentrations of 2-methylisoborneol (MIB) plot as a single line on a percent remaining, Ce/Co × 100%, versus carbon dose, Cc, plot. This indicates that the percent removal of MIB is independent of its initial concentration in natural water for a given PAC dose. The relationship is specific for each type of PAC, and it is not valid at very high MIB concentrations, however. These data show that, predicting the minimum amount of carbon necessary to effectively mitigate any MIB episode, may be accomplished by analyzing a single bottle-point isotherm. The robustness of this approach was shown through the use of four water sources, fourteen different carbons, and MIB concentrations ranging from 45 ng/l to 178 μg/l.
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