Advances in Water Treatment and Enviromental Management

GAS LIQUID MIXING AND MASS TRANSFER 125Figure 9: Arrangement of fixed head aerator, ref. (6)(c)(d)ICI “deep shaft” process. This operates in a similar manner to the airliftreactor, Section 4.2, see Figure 10. Very large depths are employed (up to100m), giving very high partial pressures in the gas phase, and hencerapid mass transfer.Enriched oxygen techniques. Enriched air, or pure oxygen, are used toincrease the mass transfer rate by increasing the concentration duringforce (e.g. BOC Vitox process or the Unox process).Figure 10: Deep shaft aerator, ref. (12)