Abstract

The aeration of volatile organic compounds (VOC) is based on the mass transfer rate of VOCs from the liquid phase to the gaseous phase. Principle of air stripping involves the mass transfer of volatile organic contaminant from water to air. The system can be easily upgraded to strip greater amount of VOCs with relatively small increase in capital cost. Aeration tanks strip volatile compounds by bubbling air into tank through which contaminated water flows. The present study shows power input in VOC by using advanced designed gas dispersing radial impeller that is, Rushton, CD-6 and BT-6, the factors which affect the design of aeration tank baffles and the impeller used for best possible result. This study also shows the power input of VOCs at different height of submergence. A comparison of the result from experiment that shows the power input of VOCs during aeration is a function of mass transfer coefficient of air and it increases with the increase of submergence of height, by supply of air, and increase in impeller speed. Best power input result can be obtained at the 2/3rd height of the submergence of the total depth of water for impeller used.

Key words: Power input, gas dispersion impellers, Rushton impeller, CD-6 impeller, BT-6 impeller.