And Semidry Garbage Waste Fractions 355

Norbert Rilling

14.1 Introduction 355

14.2 Basic Aspects of Biological Waste Treatment 355

14.2.1 Biochemical Fundamentals of Anaerobic Fermentation 356

14.2.1.1 Hydrolytic and Acid-forming (Fermentative) Bacteria 357

14.2.1.2 Acetic Acid- and Hydrogen-forming (Acetogenic) Bacteria 357

14.2.1.3 Methane-forming (Methanogenic) Bacteria 357

14.2.2 Influence of Processing Conditions on Fermentation 358

14.2.2.1 Water Content 358

14.2.2.2 Temperature 358

14.2.2.3 pH Level 358

14.2.2.4 Redox Potential and Oxygen 358

14.2.2.5 Inhibitory Factors 359

14.2.3 Gas Quantity and Composition 359

14.2.4 Comparison of Aerobic and Anaerobic Waste Treatment 360

14.3 Processes of Anaerobic Waste Treatment 361

14.3.1 Procedures of Anaerobic Waste Fermentation 362

14.3.1.1 Delivery and Storage 363

14.3.1.2 Preprocessing 364

14.3.1.3 Anaerobic Fermentation 364

14.3.1.4 Post-processing 365

14.3.2 Process Engineering of Anaerobic Fermentation of Biowastes 365

14.3.2.1 Dry and Wet Fermentation 366

14.3.2.2 Continuous and Discontinuous Operation 367

14.3.2.3 Thermophilic and Mesophilic Operation 368

14.3.2.4 Agitation 368

14.3.3 Survey of Anaerobic Fermentation Processes 369

14.3.4 Feedstock for Anaerobic Digestion 369

14.4 Conclusions 372 References 373

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