Review about bioproduction of Volatile Fatty Acids from wastes and wastewaters: Influence of operating conditions and organic composition of the substrate

Volatile fatty acids (VFAs) are a group of carboxylic considered as building block chemicals. Nowadays, commercial production VFAs is performed using fossil fuel sources. As an alternative, acidogenic fermentation wastes by mixed microbial cultures (MMC) starting to be potential bioproduction process that would replace conventional processes and contribute the circular economy. Nevertheless, more research needed control VFA yields precisely drive certain or mixture VFAs, either modifying operational parameters appropriately tunning substrate composition. Following this gap, review starts screening metabolic routes yield anaerobic fermentation. Subsequently, effect different on composition distribution extensively discussed depending organic waste in terms proteins, carbohydrates lipids. To best our knowledge, previous articles analyzed impact these for types wastes, but without specifically considering their Afterwards, energy-based models presented one modelling approaches predict Then, polyhydroxyalkanoates (PHAs) MMC described since it most promising applications derived VFAs. Finally, we highlight gaps should further investigated develop large scale bioprocess based platform from streams. • Knowing stream (proteins, carbohydrates, lipids) paramount importance. Operational maximizing depend mainly related (carbohydrates, lipids, proteins). Energy-based best-known tools Polyhydroxyalkanoates