Salinity enhances high optically active L-lactate production from co-fermentation of food waste and waste activated sludge: Unveiling the response of microbial community shift and functional profiling. (January 2021)

• Record Type: Journal Article
• Authors: Li, Xiang; Sadiq, Safeena; Zhang, Wenjuan; Chen, Yiren; Xu, Xianbao; Abbas, Anees; Chen, Shanping; Zhang, Ruina; Xue, Gang; Sobotka, Dominika; Makinia, Jacek
• Is Part Of: Bioresource technology. Volume 319(2021)
• Publication Date: 2021-01
• Subjects: Lactic acid -- Optical activity -- Salt -- Food waste -- Waste activated sludge; 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.2020.124124
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Lactic acid productivity increased at 10 gNaCl/L. Optical pure L-lactate was obtained at 30 gNaCl/L. The abundance of lactic acid bacteria genera increased with salt amendment. Functional genes related to lactic acid production shifted with salt amendment. Abstract: Lactic acid (LA), a versatile platform molecule, can be fermented from organic wastes, such as food waste and waste activated sludge. In this study, an efficient approach using salt, a component of food waste as an additive, was proposed to increase LA production. The LA productivity was increased at 10 g NaCl/L and optical pure L-lactate was obtained at 30 g NaCl/L. The enhancement of LA was in accordance with the increased solubilization and the critical hydrolase activities under saline conditions. Moreover, high salinity (30–50 g NaCl/L) changed the common conversion of LA to volatile fatty acids. In addition, the key LA bacteria genera ( Bacillus, Enterococcus, Lactobacillus ) were selectively enriched under saline conditions. Strong correlations between salinity and functional genes for L-LA production were also observed. This study provides a practical way for the enrichment of L-LA with high optical activity from organic wastes.