Mild alkaline conditions affect digester performance and community dynamics during long-term exposure.

Autor: Chen B; KU Leuven, Department of Chemical Engineering, Process and Environmental Technology Lab, Jan Pieter De Nayerlaan 5, B-2860 Sint-Katelijne-Waver, Belgium., Azman S; Avans University of Applied Sciences, Academy of Life Sciences and Technology, Lovensdijk 61, 4818 AJ Breda, Netherlands., Crauwels S; KU Leuven, Department of Microbial and Molecular Systems (M(2)S), Centre of Microbial and Plant Genetics, Willem de Croylaan 46, 3001 Leuven, Belgium., Dewil R; KU Leuven, Department of Chemical Engineering, Process and Environmental Technology Lab, Jan Pieter De Nayerlaan 5, B-2860 Sint-Katelijne-Waver, Belgium., Appels L; KU Leuven, Department of Chemical Engineering, Process and Environmental Technology Lab, Jan Pieter De Nayerlaan 5, B-2860 Sint-Katelijne-Waver, Belgium. Electronic address: lise.appels@kuleuven.be.
Jazyk: angličtina
Zdroj: Bioresource technology [Bioresour Technol] 2024 Aug; Vol. 406, pp. 131009. Date of Electronic Publication: 2024 Jun 22.
DOI: 10.1016/j.biortech.2024.131009
Abstrakt: This paper examines the adaptive responses of microbial communities to gradual shifts in pH toward the mild alkaline range in anaerobic digestion (AD) systems. The results indicate that a pH of 8.0 serves as a critical upper limit for stable AD operation, beyond which microbial efficiency declines, underscoring the importance of microbial resilience against elevated pH stress. Specifically, hydrolysis genera, e.g. Eubacterium and Anaerobacterium, and syntrophic bacteria were crucial for reactor stability. Fibrobacter had also been shown to play a key role in the accumulation of propionate, thus leading to its dominance in the volatile fatty acid profile throughout the experimental phases. Overall, this investigation revealed the potential adaptability of microbial communities in AD systems to mild alkaline pH shifts, emphasizing the hydrolysis bacteria and syntrophic bacteria as key factors for maintaining metabolic function in elevated pH conditions.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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