Potential for volatile fatty acid production via anaerobically-fermenting rice straw pretreated with silage effluent and phenyllactic acid. (February 2023)

• Record Type: Journal Article
• Authors: Sun, Hong; Liao, Chaosheng; Chen, Liangyin; Cheng, Qiming; Zheng, Yulong; Wang, Chunmei; Xie, Yixiao; Chen, Chao; Li, Ping
• Is Part Of: Bioresource technology. Volume 369(2023)
• Publication Date: 2023-02
• Subjects: Silage leachate -- Biological pretreatment -- Antibacterial agent -- Lactic acid bacteria -- Bacterial community; 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.2022.128355
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Rice straw was co-fermented anaerobically with silage effluent for VFAs production. Silage effluent pretreatment increased total VFA yield up to 25.1%. Phenyllactic acid addition reduced the abundance of Lactobacillus . Application of PLA increased acetic acid and butyric acid up to 1.2 and 1.4 times. Abstract: To resolve environmental problems associated with rice straw and silage effluent disposal, silage effluent pretreating rice straw for the anaerobic production of volatile fatty acids (VFAs) was investigated. To prevent the lactic acid bacteria in silage effluent from inhibiting anaerobic fermentation, four phenyllactic acid (PLA) levels were set (0, 0.1, 0.3, 0.5 mg/kg). The total VFA yields of treatments pretreated only with silage effluent (CK) were higher than the groups combined with PLA during 15 days fermentation. Compared to PLA treatments, the total VFA of CK increased by 11.4 % ∼ 25.1 % on day 15. The CK showed higher lactic and propionic acid contents and lower pH values (<4.9). The PLA treatments decreased Lactobacillus abundance while increasing bacterial richness and evenness, and acetic and butyric acid contents. These demonstrated silage effluent has the potential to be used as a biological pretreatment for VFA production in anaerobic fermentation.