Improved A2 / O-MBR treatment device, characterized in that it comprises an anaerobic tank, a first anox tank, a second anox tank, an aerobic tank and a membrane tank connected in series, the anaerobic tank being provided with a waste water inlet, the bottom of the anaerobic tank, the first anox tank and the second anox tank is provided with a stirrer, the bottom of the aerobic tank being provided with an aeration head, the membrane tank comprising a membrane module, wherein a perforated ventilation pipe is arranged under the membrane module, the device being an air compressor for Aeration of the aerobic tank and the membrane tank comprises, the second anox tank being connected to the anaerobic tank, the aerobic tank being connected to the first anox tank, the membrane tank being connected to the anaerobic tank, the membrane tank being provided with a sludge outlet opening and a sludge return opening.
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