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Oxygen Transfer Characteristics & Pure Oxygen Application Study on Circulation Flow Rate of the JLB (Jet Loop Bioreactor)  

Park, Noh-Back (National Academy of Agricultural Science, Rural Development Administration)
Song, Yong-Hyo (Department of Environmental Engineering, Chungbuk National University)
Pack, June-Gue (Department of Environmental Engineering, Chungbuk National University)
Jun, Hang-Bae (Department of Environmental Engineering, Chungbuk National University)
Publication Information
Journal of Korean Society on Water Environment / v.25, no.6, 2009 , pp. 896-901 More about this Journal
Abstract
In this study, in order to apply the air and pure oxygen in the Jet Loop Reactor (JLB) in which the oxygen transfer rate is high, differentiate the operation mode according to each air flowrate and liquid flowrate and investigate the oxygen transfer characteristic, an experiment was carried out. The oxygen concentration with the air flowrate ($Q_g$) and liquid flowrate ($Q_L$) was identical but the oxygen transfer coefficient ($K_L{\cdot}a$) is linear depending on degree of two factors. The width of an increase is small in $0.1min^{-1}$ when the air flowrate is 0.2 L/min with increasing the liquid flowrate. Whereas, the increment was exposed to be very high for $1.5min^{-1}$ when the air flowrate was 5 L/min. In the experiments using the pure oxygen, it was 30 mg/L of oxygen concentration finally and it was 3.5 times than using the air. But the time reached the saturated concentration was similar to using the air, and $K_L{\cdot}a$ was similar to using the air too. Analysis between two independent variable and oxygen transfer of the correlation is the same model like $K_L{\cdot}a={0.0161Q_L}^{1.5371}{Q_g}^{0.5433}$ using with coefficient non linear regression analysis. It was resulted that the liquid flowrate were approximately three times than air flowrate on effect to oxygen transfer rate.
Keywords
Air flowrate; Jet Loop Reactor; Oxygen transfer coefficint; Recirculation flowrate;
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