Abstract
CALPUFF model and ISCST3 Gaussian dispersion models were evaluated for odor modeling in predicting downwind concentrations and back-calculating area source odor emission rates. The comparison between predicted downwind concentrations and field-sampled downwind concentration measurements indicated that CALPUFF could fairly well predict average odor downwind concentrations. However, ISCST3 tended to predict concentrations less than the measured concentrations. Both CALPUFF and ISCST3 models failed to predict peak odor concentrations using constant average emission rate. Odor emission rates obtained by back-calculating fluxes using CALPUFF and ISC models with the same field measurements of downwind odor concentrations are significantly different. It indicates that back-calculated emission rates are not exchangeable for different models. The modeled emission rates tended to be higher than flux chamber source sampling results. The flux chamber protocol may under-estimate odor emission rates.
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