Improving production of lactic acid and volatile fatty acids from dairy cattle manure and corn straw silage: Effects of mixing ratios and temperature. (September 2022)

• Record Type: Journal Article
• Authors: Lian, Tianjing; Zhang, Wanqin; Cao, Qitao; Wang, Shunli; Dong, Hongmin; Yin, Fubin
• Is Part Of: Bioresource technology. Volume 359(2022)
• Publication Date: 2022-09
• Subjects: Anaerobic co-fermentation -- Short-chain carboxylic acids -- Agricultural waste -- Hydrolysis performance -- Bacterial communities; 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.2022.127449
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Effects of mixing ratio and temperature during AcoF of DCM with CSS were studied. Highest LA concentration of 17.50 g/L at the 1:3 ratio of DCM/CSS at thermophilic. Highest VFAs concentration of 18.23 g/L at the 1:0 ratio of DCM/CSS at mesophilic. Thermophilic fermentation increased solubilization of feedstock and LA production. Mixing CSS could enrich Bifidobacterium for VFAs and Lactobacillus for LA. Abstract: Anaerobic co-fermentation (AcoF) of dairy cattle manure (DCM) and corn straw silage (CSS) for producing lactic acid (LA) and volatile fatty acids (VFAs) was investigated. Batch experiments were conducted at seven different DCM/CSS ratios and at mesophilic and thermophilic temperatures. Results indicated that the highest concentration of LA was 17.50 ± 0.70 g/L at DCM:CSS ratio of 1:3 and thermophilic temperature, while VFAs was 18.23 ± 2.45 g/L at mono-CSS fermentation and mesophilic temperature. High solubilization of thermophilic conditions contributed to LA accumulation in AcoF process. Presence of the CSS increased the relative abundance of Lactobacillus for LA production at thermophilic. Meanwhile, the abundance of Bifidobacterium was increased when CSS was added at mesophilic, which could conduce to VFAs production. This study provides a new route for enhancing the biotransformation of DCM and CSS into short-chain fatty acids, potentially bringing economic benefits to agricultural waste treatment.