NOVELTY - Microbial fuel cell comprises reactor casing (1), plexiglass panel (2), roll cathode (3) and brush anode (4). The reactor casing is open rectangular plexiglass box with 8 vertical plexiglass plate and 8 modules, where each module consists of plexiglass panel, roll cathode and 4 brush anode. The plexiglass plate has 10 cm length, 21.5 cm width and 26 cm high. The roll cathode is activated carbon air cathode roll comprising air diffusion layer (5) and catalytic layer (6) separated by stainless steel mesh as carrier.    USE - Microbial fuel cell used for sewage treatment plant.    ADVANTAGE - The cell is carbon-free, self-sufficiency and environment-friendly with improving waste resources utilization.    DETAILED DESCRIPTION - Microbial fuel cell comprises reactor casing (1), plexiglass panel (2), roll cathode (3) and brush anode (4). The reactor casing is open rectangular plexiglass box with 8 vertical plexiglass plate and 8 modules, where each module consists of plexiglass panel, roll cathode and 4 brush anode. The plexiglass plate has 10 cm length, 21.5 cm width and 26 cm high. The roll cathode is activated carbon air cathode roll comprising air diffusion layer (5) and catalytic layer (6) separated by stainless steel mesh as carrier. An AB glue used for pairing roll cathode and plexiglass plate surface, where two roll-cathode has spacing of 3 cm and two plexiglass plates and non-roll cathode surface has spacing of 1 cm. The brush anode is carbon fiber brush anode rod with diameter of 3 cm and length of 23 cm, and core is titanium with diameter of 1 mm and length of 35 cm, where vertically distributed in central part of plexiglass plate hole. The plexiglass box two side plates and between eight plexiglass plate forming nine rectangular opening, where two roll cathode between four rectangular opening is connected to air communication port (7), remaining five rectangular water outlet and plant ryegrass insertion port (8) forms artificial wetland and air inlet is connected to ryegrass insertion port. The bottom of reactor casing is provided with water outlet connected to rubber tube with rubber stopper for sealing to prevent leakage. An external circuit is provided with booster circuit board, continuous flow pump, electromagnetic relay and capacitor, where microbial fuel cell through external circuit is connected to continuous flow pump.    DESCRIPTION OF DRAWING(S) - The drawing shows a front view of microbial fuel cell.    Reactor casing (1)    Plexiglass panel (2)    Roll cathode (3)    Brush anode (4)    Air diffusion layer (5)    Catalytic layer (6)    Air communication port (7)    Ryegrass insertion port (8)