Methane recovery efficiency in a submerged anaerobic membrane bioreactor (SAnMBR) treating sulphate-rich urban wastewater: Evaluation of methane losses with the effluent

► SAnMBR represents a sustainable approach for urban wastewater treatment. ► The biogas-assisted mixing avoids super-saturation of methane at the effluent. ► The methane recovery efficiency obtained at 20 °C was slightly lower than at 33 °C. ► A temperature drop reduced the treatments efficiency and increased gases solubility. ► The methane recovery efficiency was mainly affected by the influent COD/S-SO4 ratio.