Chapter 47 - Recovery and valorization of CO2 from the organic wastes fermentation

Abstract

Carbon dioxide (CO2) is an important heat-trapping gas that has received much attention over the last decade due to its role in global warming. The reduction of its emission and its recovery and reuse are the main factors for building a sustainable society. A major part of this process is the valorization of organic wastes. The fermentation of agrifood wastes to bioproducts produces massive amounts of biogenic carbon dioxide at high purity. Despite having several commercial applications, the fermentative CO2 is rarely captured and reused. This chapter focuses on the most recent advances in chemical and biological technologies for the capture and reuse of biogenic CO2 produced from the fermentation of agrifood wastes and byproducts. First there is an overview of organic wastes production, that is followed by their reuse technologies such as ethanol and biogas/biohydrogen production, which result in a great amount of carbon dioxide. Finally, the capture and reuse of this gas for the production of new products in a carbon-based circular economy is presented and discussed.