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| Preparation and anti-biofouling performance of vanillin-modified ultrafiltration membrane |
| HOU Bing-qian1, CHEN Xin-yu1, GENG Ru1, WANG Dan-ni1, ZHOU Xiang-tong1,2, WU Zhi-ren1,2, WEI Jing1,2,3 |
1. School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang 212013, China;
2. Institute of Environmental Health and Ecological Security, Jiangsu University, Zhenjiang 212013, China;
3. Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment, Suzhou University of Science and Technology, Suzhou 215009, China |
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Abstract To enhance the anti-biofouling performance of polyacrylonitrile ultrafiltration membrane in wastewater, quorum sensing inhibitor, vanillin, was used to modify the membrane by surface coating. The surface morphology, chemistry, hydrophilicity, surface charge, and water permeability of the modified membrane were systematically characterized. Escherichia coli (E. coli) was used to assess the impact of vanillin on bacterial colony growth and biofilm formation on vanillin modified membrane. Effluent from the bioreactor was used as feed to test the anti-fouling performance of vanillin modified membrane. The results showed that vanillin could effectively inhibit the formation of bacterial colonies on agar plates. The initial adhesion and growth of E. coli on the modified membrane were decelerated, and there was no mature biofilm on the membrane surface after being cultured for 48h. Membrane fouling experiments showed that the flux reduction of the modified membrane was 15.6% less than that of the unmodified membrane. The extracellular polymeric substances content in the biofilm of the modified membrane was 15.9% less than that of the unmodified membrane, further demonstrating the enhanced anti-biofouling property after modification. The results indicated that the modified membrane reduced the accumulation of N-acyl homoserine lactones (AHLs) signal molecules in the filtration system, and inhibited the participation of dominant Enterobacteriaceae bacteria from feed in biofilm formation, which affected the structure of bacterial community in biofilm.
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Received: 20 December 2022
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