Anaerobiosis, Acetic Acid - chemistry, Phylogeny, Microbial Consortia, Butyric Acid - chemistry, Time Factors, Polymerase Chain Reaction, Ammonia - chemistry, Food, Solid Waste, Propionates - chemistry, Bacteria - metabolism, Fatty Acids - chemistry, Biofuels, Denaturing Gradient Gel Electrophoresis, Archaea - metabolism, Sewage, Bioreactors, Methane - chemi...