Advances in Water Treatment and Enviromental Management

150 WATER TREATMENT3.2 Oxygen transfer in waterValues of the overall volumetric mass-transfer coefficient k were determined in 50experiments with different air-water-flow conditions. Typical results of oxygenmeasurements in water are plotted in Fig. 8 for both grid types and a water flowrateThe data were correlated asversus time t, in accordance withthe integrated form of equation (3). The value of R 2 , the square of the correlationcoefficient, generally exceeded 0.99. The linearity of the data sets attests to the goodnessof fit of the mass-transfer model. All experimental data are summarized in table 3.Fig. 8: Typical Curves of the Oxygen Concentrations C L(t) in waterTable 2: Efficiency of Oxygen Transfer ?Table 3: Results of the Experiments: Overall Volumetric Mass-TransferCoefficient k L·a [l/min]