Biochemicals from food waste and recalcitrant biomass via syngas fermentation: A review. (January 2018)

• Record Type: Journal Article
• Authors: Wainaina, Steven; Horváth, Ilona Sárvári; Taherzadeh, Mohammad J.
• Is Part Of: Bioresource technology. Volume 248:Part A(2018)
• Page Start: 113
• Page End: 121
• Publication Date: 2018-01
• Subjects: Food waste -- Lignocelluloses -- Syngas fermentation -- Co-cultures -- Reactor design; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2017.06.075
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Gasification-fermentation process efficiently converts organic wastes into biochemicals. Several innovative cultivation methods of autotrophic bacteria have been developed. The aim of such methods is to improve product yield and widen product range. Mass-transfer limitation is the major bottleneck in the fermentation process. Certain reactor designs that the enhance volumetric mass transfer coefficient are described. Abstract: An effective method for the production of value-added chemicals from food waste and lignocellulosic materials is a hybrid thermal-biological process, which involves gasification of the solid materials to syngas (primarily CO and H2 ) followed by fermentation. This paper reviews the recent advances in this process. The special focus is on the cultivation methods that involve the use of single strains, defined mixed cultures and undefined mixed cultures for production of carboxylic acids and higher alcohols. A rate limiting step in these processes is the low mass transfer between the gas and the liquid phases. Therefore, novel techniques that can enhance the gas-liquid mass transfer including membrane- and trickle-bed bioreactors were discussed. Such bioreactors have shown promising results in increasing the volumetric mass transfer coefficient (kL a). High gas pressure also influences the mass transfer in certain batch processes, although the presence of impurities in the gas would impede the process.