Coupling of Immobilized Photosynthetic Bacteria with a Graphene Oxides/PSF Composite Membrane for Textile Wastewater Treatment: Biodegradation Performance and Membrane Anti-Fouling Behavior
| Autor: | Lei Qin, Jin Binbin, Cheng Jing, Xiaofeng Wu, Zheng Rongwei, Zhang Chenchen |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
GO nanosheets
Membrane permeability Filtration and Separation 02 engineering and technology 010501 environmental sciences lcsh:Chemical technology Membrane bioreactor 01 natural sciences Article Extracellular polymeric substance Chemical Engineering (miscellaneous) lcsh:TP1-1185 immobilized cells lcsh:Chemical engineering 0105 earth and related environmental sciences Fouling membrane fouling Chemistry Process Chemistry and Technology Membrane fouling lcsh:TP155-156 membrane modification Biodegradation 021001 nanoscience & nanotechnology wastewater treatment Membrane Chemical engineering Photosynthetic bacteria 0210 nano-technology |
| Zdroj: | Membranes Volume 11 Issue 3 Membranes, Vol 11, Iss 226, p 226 (2021) |
| ISSN: | 2077-0375 |
| Popis: | The membrane bioreactor (MBR), as one of the promising technologies, has been widely applied for treatments of wastewater. However, serious membrane fouling and low microbial activity have been reported as major problems hindering the development of the MBR. To overcome these drawbacks, we intend to improve the MBR process in the view of membrane surface modification and efficient granular bacteria cultivation. In the present study, immobilized photosynthetic bacteria integration with graphene oxide (GO)/polysulfone (PSF) composite membrane separation (IPMBR) was first applied for textile wastewater treatment. Due to the high activity of immobilized cells, the IPMBR system exhibited higher efficiency on the removal of color, ammonia–nitrogen, and chemical oxygen demand than the conventional MBR system. In comparison with a pure PSF membrane, GO/PSF composite membrane presented the higher hydrophilicity (water contact angles of 62.9°) and more attractive permeability (178.5 L/m2h) by reducing the adhesion of hydrophobic foulants. During the whole operation, the immobilized photobioreactor exhibited approximately seven times higher membrane permeability that that of the conventional MBR. Meanwhile, the effect of the structure and character of immobilized photosynthetic bacteria on the membrane fouling reduction was investigated in detail. The change of extracellular polymeric substance concentration, settleability and particle size of flocs was very beneficial to alleviate membrane fouling. As a result, this research will open a new avenue for developing efficient and anti-fouling MBR technology in the future. |
| Databáze: | OpenAIRE |
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