Journal
ENVIRONMENTAL RESEARCH
Volume 239, Issue -, Pages -Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.envres.2023.117413
Keywords
Anaerobic digestion; Bacterial signaling; Quorum sensing; Quorum quenching; Membrane bioreactor; Microbial community
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This review examines the roles of quorum sensing (QS) and quorum quenching (QQ) in anaerobic digestion processes. QS signal molecule AHL can promote biofilm formation and organic degradation, thereby improving the efficiency of anaerobic digestion. QQ has been shown to effectively control membrane fouling. However, its impact on methane productivity remains unclear.
Anaerobic digestion (AD) is a biological process that employs anaerobic microorganisms to degrade organic material, yielding biogas and biofertilizers. Understanding quorum sensing (QS) signaling in mixed microbial systems provides valuable insights into microbial behavior and functions. This review aims to examine recent studies on the roles of QS and QQ in the AD processes. A QS signal molecule, N-acyl homoserine lactone (AHL), induce the production of extraceluller polymers, promoting biofilm formation and bacterial aggregation, thereby the efficiency of AD process. QS-assisted granule formation fosters syntrophy between acetogens and methanogens, leading to increased organic removal and methane production. Specific AHLs were shown to be correlated with the abundance of hydrolytic bacteria and acidogens, further benefiting methane production. QQ was shown to effectively control membrane fouling in anaerobic membrane bioreactors, yet its impact on methane productivity remains unclear. This review shed lights on the existing literature gaps regarding the mechanisms of QS and QQ in AD systems, which will play a vital role in advancing AD applications in the future.
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