Comprehensively evaluating the digestive performance of sludge with different lignocellulosic components in mesophilic anaerobic digester. (December 2019)

• Record Type: Journal Article
• Authors: Chen, Yongdong; Yang, Haifeng; Zhao, Ziyan; Zou, Huijing; Zhu, Ruilin; Jiang, Qin; Sun, Tong; Li, Mingxing; Li, Li; Shi, Dezhi; Ai, Hainan; He, Qiang; Gu, Li
• Is Part Of: Bioresource technology. Volume 293(2019)
• Publication Date: 2019-12
• Subjects: Digestion -- Digestive performances -- Lignocellulosic components -- VFAs composition -- Microbial diversity; 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.2019.122042
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Hemicellulose is liable to be hydrolyzed while cellulose and lignin are not. Hemicellulose and cellulose have a good synergistic effect in digestion. Adding dealkaline lignin into AD system promotes substrates' hydrolysis. The remained cellulose in slurry lowers VFAs' concentration by adsorption effect. Lignocellulosic components addition affects the relative abundance of microbes. Abstract: In excess sludge digestion, organic matters cannot be digested adequately due to its high lignocellulose content. This study attempted to comprehensively evaluate the digestive performances of sludge with different lignocellulosic components (hemicellulose, cellulose and lignin). Results show that hemicellulose/dealkaline lignin addition (S6) presents the highest methane yield of 203.6 mL/gVS. Compared to hemicellulose, dealkaline lignin is hardly degraded (lower than 10%), while its participation can promote the degradation of other organics in the system. Additionally, solo cellulose feedstock is difficult to be hydrolyzed (only 40.1%) without hemicellulose and dealkaline lignin addition. VFAs composition analysis indicates that VFA inhibition occurs in the digester with hemicellulose, cellulose and dealkaline lignin addition (S8). Microbial diversities of different digestive systems show that the relative abundance of Euryarchaeota in the digester S6 (7.2%) is much higher than others, and some specific microbes ( Bacteroidetas and Firmicutes ) are enriched in the S5 (74.1%) and S8 (54.7%) digesters.