Impacts of environmental factors on AHL-producing and AHL-quenching activities of aerobic granules
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Aerobic granule is widely recognized as a promising biological wastewater treatment technique. Acyl-homoserine lactone (AHL)–mediated quorum sensing and quenching are reported to be involved in the formation of aerobic granules. However, little is known about how environmental factors affect the AHL-producing and AHL-quenching communities and their activities in aerobic granules. Therefore, in this work, the bacterial community of aerobic granules was explored and the impacts of substrate, electron acceptor, sludge concentration, pH, and temperature on the AHL-related communities and activities of aerobic granules were examined. These factors were found to affect the AHL-related activities, and thereby change the AHL level. The AHL-producing activities were observed to be more sensitive to the variation of these factors than the AHL-quenching activities. These findings help to establish the links between environmental factors and AHL-related activities and thus provide useful guides for the operation of aerobic granule systems.
KeywordsAcyl-homoserine lactone (AHL) Aerobic granules Environmental factors Quorum sensing
This work was partially supported by the National Key R&D Program of China (2018YFC0406303), the National Natural Science Foundation of China (51808522, 51578210, 51538011 and 51821006), and the the Program for Changjiang Scholars and Innovative Research Team in University of the Ministry of Education of China.
Compliance with ethical standards
This article does not contain any studies with human participants or animals performed by any of the authors.
Conflict of interest
The authors declare that they have no conflict of interest.
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