AI Article Synopsis
- Researchers examined the role of diffusible signal factor (DSF) in the formation of aerobic granular sludge (AGS) using two sequence batch reactors (SBRs) with differing temperature conditions.
- In Reactor 2, DSF secretion decreased by 15% at a higher temperature, leading to a significant 26% increase in extracellular polymeric substance (EPS) concentration, which accelerated the granulation process by 63%.
- After temperature shocks, DSF levels increased by 70% while EPS levels dropped by 47%, confirming that DSF inhibits EPS secretion and showing that changes in specific bacteria populations affect EPS production and AGS granulation.
Article Abstract
Signal-molecule-mediated strategies are proposed for aerobic granular sludge (AGS), but the regulatory mechanisms behind AGS formation are largely unexplored. In this study, two sequence batch reactors (SBRs) were operated to investigate the regulation of diffusible signal factor (DSF) in AGS formation. DSF secretion in Reactor 2 (R2: 10 °C→25 °C) decreased by 15 % compared to Reactor 1 (R1: 25 °C→10 °C), correlating with a 26 % increase in extracellular polymeric substance (EPS) concentration, resulting in a 63 % acceleration of the granulation process. After temperature shocks in R2, DSF concentration increased by 70 %, while EPS concentration decreased by 47 %. Batch tests confirmed that DSF inhibited EPS secretion. Combined 16S rRNA analysis and machine learning identified key bacteria responsible for secreting EPS and signal molecule. The decrease in the abundances of these bacteria reduced EPS production. These findings on DSF regulation of EPS secretion provide an in-depth understanding of enhanced AGS granulation.
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| http://dx.doi.org/10.1016/j.biortech.2024.131369 | DOI Listing |
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