期刊
ADVANCED MATERIALS INTERFACES
卷 9, 期 33, 页码 -出版社
WILEY
DOI: 10.1002/admi.202201443
关键词
biofilm inhibition; feed spacers; laser-induced graphene; spiral wound modules; water treatments
资金
- Ministry of Science and Technology of the State of Israel
- German Federal Ministry of Education and Research (BMBF, PTKA) [BMBF 02WIL1487]
This study demonstrates that an electrically conductive feed spacer coated with laser-induced graphene (LIG) has antimicrobial and antifouling effects in a spiral wound reverse osmosis (RO) membrane module. The LIG spacer can completely inactivate Pseudomonas aeruginosa and significantly reduce bacterial adhesion of Rheinheimera sp. under low electrical current. It effectively reduces biofilm growth on both the membrane and spacer components when used in brackish water with 12 V.
Biofouling is an ongoing challenge for water treatment membrane processes. Reducing biofilm growth on the membrane surface or on the polymeric feed spacer will reduce operation, maintenance, and module replacement costs. Laser-induced graphene (LIG) is a low cost, environmentally friendly, electrically conductive carbon material shown to have antibiofouling properties. Here it has been shown that an electrically conductive LIG-coated polypropylene (PP) feed spacer has both antimicrobial and antifouling effects under a low electrical current, and when implemented into a spiral wound membrane module reduced biofilm growth on both the membrane and the spacer components. The antibacterial property of the LIG spacer is tested using Pseudomonas aeruginosa and the brackish water Rheinheimera sp. as model organisms. Using a voltage of 12 V, P. aeruginosa is completely inactivated in 10 h, while a dynamic accumulation assay employing Rheinheimera sp. showed significant reduction (p < 0.05) in bacterial adhesion compared to an uncoated spacer. The spacer is incorporated into a spiral wound reverse osmosis (RO) membrane module, and reduced biofouling is observed on both the membrane and LIG spacers components using brackish water and 12 V. This study demonstrates the feasibility of electrically conductive feed spacer components in spiral wound RO membrane modules.
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