Mitigation of Membrane Biofouling in MBR Using a Cellulolytic Bacterium, Undibacterium sp. DM-1, Isolated from Activated Sludge
| Autor: | Sang Hyun Lee, Jae Young Jang, Pyung Kyu Park, Chang Hyun Nahm, Hyeokpil Kwon, Kibaek Lee, Seonki Lee, Jung-Kee Lee, Chung-Hak Lee, Kwang-Ho Choo, Jaewoo Lee |
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| Rok vydání: | 2017 |
| Předmět: |
biology
Chemistry Biofilm 02 engineering and technology General Medicine Cellulase 010501 environmental sciences biology.organism_classification Pulp and paper industry 01 natural sciences Applied Microbiology and Biotechnology Microbiology Biofouling chemistry.chemical_compound Activated sludge 020401 chemical engineering biology.protein Bioreactor Sewage treatment 0204 chemical engineering Cellulose Bacteria 0105 earth and related environmental sciences Biotechnology |
| Zdroj: | Journal of Microbiology and Biotechnology. 27:573-583 |
| ISSN: | 1738-8872 1017-7825 |
| Popis: | Biofilm formation on the membrane surface results in the loss of permeability in membrane bioreactors (MBRs) for wastewater treatment. Studies have revealed that cellulose is not only produced by a number of bacterial species but also plays a key role during formation of their biofilm. Hence, in this study, cellulase was introduced to a MBR as a cellulose-induced biofilm control strategy. For practical application of cellulase to MBR, a cellulolytic (i.e., cellulase-producing) bacterium, Undibacterium sp. DM-1, was isolated from a lab-scale MBR for wastewater treatment. Prior to its application to MBR, it was confirmed that the cell-free supernatant of DM-1 was capable of inhibiting biofilm formation and of detaching the mature biofilm of activated sludge and cellulose-producing bacteria. This suggested that cellulase could be an effective anti-biofouling agent for MBRs used in wastewater treatment. Undibacterium sp. DM-1-entrapping beads (i.e., cellulolytic-beads) were applied to a continuous MBR to mitigate membrane biofouling 2.2-fold, compared with an MBR with vacant-beads as a control. Subsequent analysis of the cellulose content in the biofilm formed on the membrane surface revealed that this mitigation was associated with an approximately 30% reduction in cellulose by cellulolytic-beads in MBR. |
| Databáze: | OpenAIRE |
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