Effects of fermentative and non-fermentative additives on silage quality and anaerobic digestion performance of Pennisetum purpureum. (February 2020)

• Record Type: Journal Article
• Authors: Wu, Peiwen; Li, Lianhua; Jiang, Junfeng; Sun, Yongming; Yuan, Zhenhong; Feng, Xidan; Guo, Yufang
• Is Part Of: Bioresource technology. Volume 297(2020)
• Publication Date: 2020-02
• Subjects: Pennisetum purpureum -- Silage -- Additive -- Microbial community -- Anaerobic digestion; 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.2019.122425
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Mixed silage additive is more effective for improving high-moisture silage quality. Specific methane yield increased by 21.80–211.48% after ensilaging. The maximum specific methane yield was 334.69 ± 22.75 mL/g VS. The genera Enterobacter and Lactobacillus were the dominant desirable bacterial. NH3 -N, hemicellulose and lactic acid were positively correlated with the specific methane yield. Abstract: The effect of additives on the silage quality, microbial community, and anaerobic digestion performance of Pennisetum purpureum with high moisture content was studied. The sample treated with a mixed additive had best silage quality with the lowest pH and highest lactic acid/acetic acid ratio. Different additives influenced the dominant desirable bacteria. Correspondingly, Enterobacter was the dominant bacterial genus for sample with non-fermentative additives, whereas for the samples with fermentative or mixed additives, both Enterobacter and Lactobacillus had high relative abundance. The parameters of NH3 -N, hemicellulose and lactic acid were positively correlated with the specific methane yield, while the lignin content was inversely correlated with the specific methane yield. The higher specific methane yield of 293.81 ± 0.15–334.69 ± 22.75 mL/g VS was obtained for samples treated with fermentative additive. Therefore, the mixed additive and fermentative additive are recommended for the silage of material with high-moisture content to improve the silage quality and methane yield.