Quorum sensing: an emerging link between temperature and membrane biofouling in membrane bioreactors
| Autor: | Sojin Min, Hosung Lee, Chang Hyun Nahm, Kibaek Lee, Ismail Koyuncu, Pyung Kyu Park, Dowon Chae, Chung-Hak Lee, Kwang-Ho Choo, Keehong Kim |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
0301 basic medicine
Biofouling 030106 microbiology Homoserine Aquatic Science Applied Microbiology and Biotechnology 03 medical and health sciences chemistry.chemical_compound Extracellular polymeric substance Bioreactors 4-Butyrolactone Bioreactor Water Science and Technology biology Sewage Chemistry Biofilm Temperature food and beverages Quorum Sensing biochemical phenomena metabolism and nutrition biology.organism_classification Quorum sensing 030104 developmental biology Membrane Biochemistry Bacteria Filtration |
| Zdroj: | Biofouling. 35(4) |
| ISSN: | 1029-2454 |
| Popis: | Lab-scale membrane bioreactors (MBRs) were investigated at 12, 18, and 25 °C to identify the correlation between quorum sensing (QS) and biofouling at different temperatures. The lower the reactor temperature, the more severe the membrane biofouling measured in terms of the transmembrane pressure (TMP) during filtration. More extracellular polymeric substances (EPSs) that cause biofouling were produced at 18 °C than at 25 °C, particularly polysaccharides, closely associated with QS via the production of N-acyl homoserine lactone (AHL). However, at 12 °C, AHL production decreased, but the release of EPSs due to deflocculation increased the soluble EPS concentration. To confirm the temperature effect related to QS, bacteria producing AHL were isolated from MBR sludge and identified as Aeromonas sp., Leclercia sp., and Enterobacter sp. through a 16S rDNA sequencing analysis. Batch assays at 18 and 25 °C showed that there was a positive correlation between QS through AHL and biofilm formation in that temperature range. |
| Databáze: | OpenAIRE |
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