AbstractThe Thibodeaux‐Hwang Air Emission Release Rate (AERR) model for volatile emissions from land treatment systems was evaluated on a constituent specific basis utilizing API Separator Sludge and a Slop Oil Emulsion Solids waste stream applied to laboratory sand and soil microcosms. Literature correlation equations were used for estimating air:oil partition coefficients necessary for model input. Measured data suggested that vapor partitioning and retardation by soil organic matter are of minor importance in the overall vapor soil transport process, and that volatile organic vapor soil diffusion can be adequately described simply by the physical environment through which the vapor is traveling.Subsurface waste application produced a two‐ to ten‐fold decrease in emission rates as predicted from the Thibodeaux‐Hwang AERR model compared with surface application conditions. Measured data followed the predicted linear relationship of flux rate versus 1/t1/2indicating the diffusional nature of soil vapor movement. The Thibodeaux‐Hwang AERR model and the parameter estimation approach consistently overestimated flux rates for the pure constituents by only a factor of approximately 2 to 10, and consequently appear quite effective for the estimation of volatile organic emissions from complex waste/soi
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