Influence of feedstock-to-inoculum ratio on performance and microbial community succession during solid-state thermophilic anaerobic co-digestion of pig urine and rice straw. (March 2018)

• Record Type: Journal Article
• Authors: Meng, Lingyu; Xie, Li; Kinh, Co Thi; Suenaga, Toshikazu; Hori, Tomoyuki; Riya, Shohei; Terada, Akihiko; Hosomi, Masaaki
• Is Part Of: Bioresource technology. Volume 252(2018)
• Page Start: 127
• Page End: 133
• Publication Date: 2018-03
• Subjects: AD anaerobic digestion -- SS-AD solid-state anaerobic digestion -- SS co-AD solid state co-anaerobic digestion -- L-AD liquid anaerobic digestion -- AMPTS automatic methane potential test system -- BMP biochemical methane potential -- F/I ratio feedstock-to-inoculum ratio -- TS total solids -- VFA volatile fatty acids -- VS volatile solids -- OTUs Operational taxonomic units; Microbial community -- Pig urine and rice straw -- Solid digestate -- Solid-state co-digestion -- Volatile solid reduction rate; 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.2017.12.099
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Solid-state batch anaerobic digestion of pig urine and rice straw. A feedstock-to-inoculum ratio (F/I) of 0.5 showed the highest methane yield. No volatile organic acid accumulation in low (0.5) and high (3.0) F/I ratios. Bacterial and archaeal communities were similar between these F/I ratios. Stable operation can be achieved between 0.5 and 3.0 of F/I ratio. Abstract: This study investigated the effect of the feedstock-to-inoculum (F/I) ratio on performance of the solid-state anaerobic co-digestion of pig urine and rice straw inoculated with a solid digestate, and clarified the microbial community succession. A 44-day biochemical methane potential test at F/I ratios of 0.5, 1, 2 and 3 at 55 °C and a 35-day large-scale batch test at F/I ratios of 0.5 and 3 at 55 °C were conducted to investigate the effects of F/I ratio on anaerobic digestibility and analyze microbial community succession, respectively. The highest cumulative methane yield was 353.7 m 3 /t VS in the large-scale batch test. Volatile fatty acids did not accumulate at any F/I ratios. The volatile solids reduction rate was highest at a F/I ratio of 0.5. Microbial community structures were similar between F/I ratios of 3 and 0.5, despite differences in digestion performance, suggesting that stable operation can be achieved at these ratios.