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Effect of Water-Surface Desorption on Volatile Compound Removal under Bubble Aeration

Shunsoku Kyosai and Bruce E. Rittmann
Research Journal of the Water Pollution Control Federation
Vol. 63, No. 6 (Sep. - Oct., 1991), pp. 887-894
Stable URL: http://www.jstor.org/stable/25044079
Page Count: 8
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Effect of Water-Surface Desorption on Volatile Compound Removal under Bubble Aeration
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Abstract

Two mechanisms of desorption of volatile compounds (VCs) can occur when a tank undergoes bubble aeration: desorption to the bubble and desorption at the free-water surface. A quantification method for prediction of bubble transfer is presented and experimentally verified. Experimental results show that desorption from the surface can be a major fraction of the total desorption rate for VCs. For field conditions, surface transfer accounts for 17 to 60% of the transfer of four chlorinated solvents, even though it accounts for only approximately 6% of the oxygen transfer. Thus, ignoring surface desorption in bubble-aeration systems can cause a major underestimation of the stripping rate of VCs.

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