Co-fermentation of sewage sludge and lignocellulosic biomass for production of medium-chain fatty acids. (October 2022)

• Record Type: Journal Article
• Authors: Yin, Yanan; Hu, Yuming; Wang, Jianlong
• Is Part Of: Bioresource technology. Volume 361(2022)
• Publication Date: 2022-10
• Subjects: Co-fermentation -- Medium-chain fatty acids -- Sewage sludge -- Lignocellulosic biomass -- Functional enzymes analysis; 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.2022.127665
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: MCFAs was obtained by co-fermentation of sewage sludge and lignocellulosic biomass. Co-fermentation accelerated caproate production and longer-chain MCFAs formation. Microbial analysis revealed that co-fermentation enriched CE microorganisms. MCFAs production was promoted by strengthening RBO or FAB pathways. Abstract: Medium-chain fatty acids (MCFAs) production from sewage sludge and lignocellulosic biomass (fallen leaves and grass) was explored. Co-fermentation of sludge and lignocellulosic biomass significantly accelerated the caproate production and promoted the longer-chain MCFAs formation. Co-fermentation of sludge and grass achieved the highest caproate production of 89.50 mmol C/L, which was 18.04 % and 41.73 % higher than the mono-fermentation of grass and sludge, respectively. Co-fermentation of sludge and leaves produced 63.80 mmol C/L caproate, which was 11.09 % and 1.03 % higher than the mono-fermentation of leaves and sludge, respectively. Microbial analysis showed that co-fermentation enriched CE microbes like genus Clostridium_sensu_stricto_ 13, Caprocipiproducens, Terrisporpbacter and Praraclostridium, and suppressed the competitive microbes like genus norank_f_Caldilineaceae and Desulfomicrobium . Functional enzymes analysis revealed that co-fermentation of sludge and leaves promoted MCFAs production through strengthening reverse β oxidation (RBO) pathway, while co-fermentation of sludge and grass stimulated MCFAs production by strengthening fatty acid biosynthesis (FAB) pathway.