NOVELTY - Supplementing oxygen involves inserting feed end of fermentation material into the biogas device with various sub-fermentation tank. Multi spacers are inserted into fermentation tanks which divide into various sub-fermentation tank. Upper part of separator is provided with drain hole. The fermentation material is fed into each sub-fermentation tanks to produce biogas. The obtained biogas is gathered in various sub-gas storage plate. Biogas slurry level rises shows high fermentation efficiency of sub-fermentation tank and low inflow is observed.    USE - Method for supplementing oxygen (claimed).    ADVANTAGE - The method saves energy.    DETAILED DESCRIPTION - Supplementing oxygen involves inserting feed end of fermentation material into the biogas device with various sub-fermentation tank. Multi spacers are inserted into fermentation tanks which divides into various sub-fermentation tank. Upper part of separator is provided with drain hole. The fermentation material is fed into each sub-fermentation tanks to produce biogas. The obtained biogas is gathered in various sub-gas storage plate. Biogas slurry level rises shows high fermentation efficiency of sub-fermentation tank and low inflow is observed. The slurry liquid in the fermentation system rises to drain lowest point. The fermentation system is continuously producing biogas. The fermentation tank is blocked by pulling lever with driving vertical rod movement in inner wall of gap gas plate between the sub-fermentation tank. The oxygenation machine contains valves, which are regulated and fixed on sleeve lower end. The oxygenation machine supplies channel inlet end of fermentation tanks, which is connected to top of the gas plate. The biogas enters into the gas passage through the center of groove, and into the intake chamber through various inlet holes, which are arranged in center of bottom of the groove chamber. The intake chamber is regulated by both ends of annular groove and upper cavity portion between fixed sleeve projection composition. The regulation of biogas driven side axial movement. The biogas pushes left with axial regulation. Regulation of right cavity axis is fixed at right end of the valve sleeve at upper end of the first and second holes. The right end of lumen of the shaft communicates with outside atmosphere. Regulation axis moves to left then the right end of the shaft lumen regulates air volume with increased speed. The intake chamber through third set of holes, which is fixed at center of the lower end of sliding socket left forms biogas into left cavity. The right gas chamber communication with exhaust passage for producing biogas. Biogas is present in the left chamber. The left chamber pressure is greater than the right chamber. The valve moves to right so that the center pressure is maintained. The regulation axis continues to move to the left, center spool moves to the right when the drive is connected to it. Sealing chamber is left between piston and left diaphragm with decreased pressure. The left diaphragm shows contraction deformation when left diaphragm between the pump output and the left air chamber volume increases. Left ventilated cavity reduces the volume of air, which is discharged through the exhaust passage and achieves purpose of the left side of the pump to absorb air. The right chamber of the gas is completely discharged when left regulation of the piston driven shaft axis moves from right to the left end of the projection obstructive regulation. The left and right end systolic regulation in extending axis is observed. The regulation axis moves to right so that the inlet chamber communicates with the fourth holes and fixed sets of left upper lumen communicates with the third holes. The biogas is present in the right chamber so the air pressure in the right chamber is increased due to which the center of the spool moves to the left. Due to this left center squeeze the gas chamber through fifth holes, third holes, first exhaust vent holes and the left hole. The center the spool moves to the left when drive shaft is connected to the left and right mobile shaft and piston. The movement of the piston shaft controls the right end to meet and promote the regulation axis. The regulation of the right shaft seals the fourth holes. The blocked third and fourth holes regulates piston shaft fit and because the intake chamber pressure is greater than atmospheric pressure, it regulates left axis such that the control shaft moves to the left under the pressure effect. The back and forth movement of the spool achieves reciprocating swinging around the center and stretching around the piston. The pump body achieves purpose of absorbing or exclusion of air.