Anaerobic Degradation of Organics 169

8.1 Catabolic Reactions - Cooperation of Different Groups of Bacteria 169

8.1.1 Survey 169

8.1.2 Anaerobic Bacteria 169

8.1.2.1 Acidogenic Bacteria 169

8.1.2.2 Acetogenic Bacteria 171

8.1.2.3 Methanogenic Bacteria 171

8.1.3 Regulation of Acetogenics by Methanogenics 173

8.1.4 Sulfate and Nitrate Reduction 175

8.2 Kinetics - Models and Coefficients 176

8.2.1 Preface 176

8.2.2 Hydrolysis and Formation of Lower Fatty Acids by Acidogenic Bacteria 176

8.2.3 Transformation of Lower Fatty Acids by Acetogenic Bacteria 177

8.2.4 Transformation of Acetate and Hydrogen into Methane 179

8.2.5 Conclusions 180

8.3 Catabolism and Anabolism 182

8.4 High-rate Processes 184

8.4.1 Introduction 184

8.4.2 Contact Processes 185

8.4.3 Upflow Anaerobic Sludge Blanket 187

8.4.4 Anaerobic Fixed Bed Reactor 188

8.4.5 Anaerobic Rotating Disc Reactor 190

8.4.6 Anaerobic Expanded and Fluidized Bed Reactors 191 Problem 192

References 193

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