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The application of anaerobic membrane bioreactor (AnMBR) process for low-carbon and sustainable municipal wastewater (MWW) treatment is still hindered by membrane fouling and dissolved methane issues, while optimizing operational mode for efficient fouling mitigation and modelling the liquid-gaseous phase equilibrium of multicomponent biogas are still not well understood. To address this gap, a 20-L submerged AnMBR was operated for the treatment of real MWW over a 200 d operation period, divided into three phases according to the variations of operational flux (5, 8 and 11 L/m²h) and intermittent filtration mode (filtration to relaxation time (F/R) ratios of 3:1, 4:1, 5:1 and 9:1). The AnMBR showed a stable COD removal (∼85%), satisfactory methane production (∼0.07 LCH₄/L-wastewater), and a high methane content of 80% regardless of filtration mode. A theoretical model was successfully developed …