A membrane biofilm reactor (MBfR) device for treatment of water avoiding biofouling comprising: a central core tube having a wall defining a lumen and one or more perforations in the wall defining a perforated region, the core tube further having a first open end and second substantially closed end; a plurality of hollow filaments, each filament having a wall that defines an inner lumen, an exterior surface, a first end, and a second end; and a case having a cavity, a first end cap, a second end cap, and at least one effluent port; wherein the first open end of the core tube is sealed in the first end cap with the perforated region extending into the central cavity of the case, and wherein the first ends of the plurality of hollow filaments are open and sealed in the first end cap and the second ends of the plurality of hollow filaments are open and sealed in the second end cap.
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