Abstract
In most streams, reaeration makes an important contribution to the oxygen budget. It is unfortunate that despite recent developments in the use of hydrocarbon gas tracers, there is no simple satisfactory technique for reaeration measurement. This paper describes a new technique based on the rate of dissolution of a floating soluble solid. The theoretical basis of the new method is described, and laboratory experiments showing the correlation between the atmospheric reaeration and solids dissolution processes are reported. A comparison with the gas tracer technique showed overall correlations between the rate of reaeration, solids dissolution, and propane desorption, but differences became apparent at high Reynolds numbers. The limiting factor between oxygen absorption and solids dissolution was identified as being the difference in the surface area of contact between the two phases. Nevertheless, it is suggested that solids dissolution is a simple and inexpensive technique for estimating reaeration.
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