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Article Abstract
This study investigates the application of magnetite (FeO) and polyaniline (PANI)-functionalized PVDF membranes in anaerobic membrane bioreactors (AnMBRs) for fouling mitigation and bioenergy recovery. Four membranes (PVDF, PANI/PVDF, FeO/PVDF, and FeO@PANI/PVDF) were evaluated over 250 days at fluxes of 2, 4, and 6 LMH. Modified membranes significantly reduced early-stage fouling, with FeO@PANI/PVDF achieving the lowest rate (0.47 kPa/d at 2 LMH), compared to PVDF (0.90 kPa/d). FeO/PVDF showed the most consistent resistance and longest service life (55 days), while all modifications maintained COD removal >83%. Biogas production peaked at 125.8 ± 29.6 L/m with energy recovery of 0.304 kWh/m at 4 LMH. Antibacterial assays demonstrated significant suppression of Pseudomonas aeruginosa, and liquid chromatography-mass spectrometry/fourier transform mass spectrometry (LC-MS/FTMS) analysis revealed decreased N-acyl homoserine lactones (AHLs) in modified membranes effluents. Molecular docking against Pseudomonas aeruginosa LasI and LasR showed strong binding affinities for PANI and FeO@PANI (-14.2 kcal/mol), suggesting disruption of QS pathways, while FeO exhibited moderate binding (-4.2 kcal/mol). These findings highlight the conductive surface modifications may interfere with quorum sensing pathways, thereby delaying biofilm formation, enhancing membrane longevity, and improving the energy efficiency of AnMBRs.
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| http://dx.doi.org/10.1016/j.watres.2025.124508 | DOI Listing |
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