Bacterial community structure and predicted function in an acidogenic sulfate-reducing reactor: Effect of organic carbon to sulfate ratios. (December 2019)

• Record Type: Journal Article
• Authors: Li, Jun; Cai, Min-Hui; Miao, Yu; Luo, Gan; Li, Wen-Tao; Li, Yan; Li, Ai-Min
• Is Part Of: Bioresource technology. Volume 293(2019)
• Publication Date: 2019-12
• Subjects: Acidogenic phase reactor -- COD/sulfate ratios -- Sulfate reduction -- Microbial co-occurrence network -- PICRUSt analysis; 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.2019.122020
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Acidogenic sulfate-reducing reactor was used for high influent sulfate content. Microbial community structure and bacterial connections network were analyzed. Desulfovibrio was the most predominant SRB in acidogenic sulfate-reducing reactor. Sulfate reduction functional genes and pathway were predicted by PICRUSt. Abstract: A lab-scale acidogenic sulfate-reducing reactor with N2 stripping was continuously operated to uncover its microbial mechanism treating highly sulfate-containing organic wastewaters. Results showed that sulfate reduction efficiency decreased with the influent COD/sulfate ratios. Microbial community analysis showed that VFA accumulation mainly caused by the predominance of fermentative bacteria including Streptococcus and Oceanotoga . Genus Desulfovibrio was the most predominant SRB and enriched at low influent COD/sulfate ratios. Although Bifidobacterium, Atopobium, Wohlfahrtiimonas, Dysgonomonas etc. had low average abundance, they were identified keystone genera by the co-occurrence network analysis. The functions of the microbial community were not insignificantly influenced by COD/sulfate ratios. All predicted functional genes involved in dissimilatory sulfate reduction reached their maximum abundances at influent COD/sulfate ratio of 1.5, while the assimilatory sulfate reduction was favored at the COD/sulfate ratio lower than 2.