Modeling of Biogas Reactors 163

Herbert Markl

6.1 Introduction 163

6.1.1 Elements of the Mathematical Model 163

6.1.2 Scale-Up Strategy 165

6.2 Measuring Techniques 167

6.2.1 Online Measurement Using a Mass Spectrometer 167

6.2.2 Online Monitoring of Organic Substances with High-Pressure Liquid Chromatography (HPLC) 169

6.3 Kinetics 170

6.3.1 Acetic Acid, Propionic Acid 176

6.3.2 Hydrogen Sulfide 179

6.3.3 Conclusions 179

6.4 Hydrodynamic and Liquid Mixing Behavior of the Biogas Tower Reactor 181

6.4.1 Mixing of the Liquid Phase 182

6.4.2 Distribution of Biomass within the Reactor 188

6.4.2.1 Experiments 188

6.4.2.2 Mathematical Modeling 190

6.5 Mass Transport from the Liquid Phase to the Gas Phase 192

6.5.1 Liquid Phase 195

6.5.2 Gas Bubbles 195

6.5.3 Head Space 195

6.6 Influence of Hydrostatic Pressure on Biogas Production 197

6.7 Outlook 199 References 202

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