Gas Liquid Oxygen Transfer and Stripping

5.1 Transport by Diffusion 83

5.2 Mass Transfer Coefficients 86

5.2.1 Definition of Specific Mass Transfer Coefficients 86

5.2.2 Two Film Theory 87

5.3 Measurement of Specific Overall Mass Transfer Coefficients KLa 90

5.3.1 Absorption of Oxygen During Aeration 90

5.3.1.1 Steady State Method 90

5.3.1.2 Non-steady State Method 91

5.3.1.3 Dynamic Method in Wastewater Mixed with Activated Sludge 92

5.3.2 Desorption of Volatile Components During Aeration 93

5.4 Oxygen Transfer Rate, Energy Consumption and Efficiency in Large-scale Plants 95

5.4.1 Surface Aeration 95

5.4.1.1 Oxygen Transfer Rate 95

5.4.1.2 Power Consumption and Efficiency 96

5.4.2 Deep Tank Aeration 98

5.4.2.1 Preliminary Remarks 98

5.4.2.2 The Simple Plug Flow Model 99

5.4.2.3 Proposed Model of the American Society of Civil Engineers 101

5.4.2.4 Further Models 103

5.4.2.5 Oxygen Transfer Rate 103

5.4.2.6 Power Consumption and Efficiency 106

5.4.2.7 Monitoring of Deep Tanks 106

5.5 Dimensional Analysis and Transfer of Models 108

5.5.1 Introduction 108

5.5.2 Power Consumption of a Stirred, Non-aerated Tank -A Simple Example 109

5.5.3 Description of Oxygen Transfer, Power Consumption and Efficiency by Surface Aerators Using Dimensionless Numbers 112

5.5.4 Application of Dimensionless Numbers for Surface Aeration 113 Problem 115

References 117

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