Characterization of microbial evolution in high-solids methanogenic co-digestion of canned coffee processing wastewater and waste activated sludge by an anaerobic membrane bioreactor. (20th September 2019)

• Record Type: Journal Article
• Authors: Lei, Zhen; Zhi, Li; Jiang, Hongyu; Chen, Rong; Wang, Xiaochang; Li, Yu-You
• Is Part Of: Journal of cleaner production. Volume 232(2019)
• Page Start: 1442
• Page End: 1451
• Publication Date: 2019-09-20
• Subjects: Co-digestion -- Canned coffee processing wastewater -- Waste activated sludge -- AnMBRs -- Microdynamics; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2019.06.045
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: The effects of the microbial community and dynamics on the efficiency of a methanogenic co-digestion system that treats canned coffee processing wastewater and waste activated sludge by means of an anaerobic membrane bioreactor, were investigated and analyzed. The co-digestion system had a chemical oxygen demand (COD) removal efficiency ≥90%, and a COD to methane ratio ≥85%. Phyla Synergistetes, Firmicutes, Proteobacteria and Ca. OP9 were dominant bacteria throughout the investigation, and the main contributors to the hydrolysis and fermentation processes. The degradation paths and functional microbes indicated that genera Caldicoprobacter and Clostridium were the main contributors in the hydrolysis process, while genus Anaerobaculum dominated the acidogenesis and acetogenesis at the most efficient hydraulic retention time (HRT) of 10 d (HRT10). The dominant methanogenesis varied from genus Methanosarcina (71.1%, HRT10) to Methanothermobacter (56.4%, HRT3), indicating a transition from acetic methanogenesis to hydrogen-dependent methanogenesis. Furthermore, a microbial analysis indicated that Acinetobacter was the main contributor to caffeine degradation in this system. This also appears to be the first time that Acinetobacter is reported to be capable of degrading caffeine in the anaerobic condition. Graphical abstract: Image 1 Highlights: Canned coffee wastewater and waste activated sludge were used for co-digestion. Efficient methanation was sustained at a high OLR of 9.18 g COD/L/d Functional microbes for specific organics degradation were identified. Anaerobaculum is the dominant bacteria at the acidogenesis and acetogenesis stages. Acinetobacter is capable of degrading caffeine in the anaerobic condition.