The present invention relates to a device for preheating wastewater in an aerobic fermentation tank using waste heat generated from a combustor using a fermentation gas such as methane gas as a fuel, Waste heat can be used to preheat the wastewater in the aerobic fermentation tank to an appropriate temperature even in a season where the temperature of the outside air is low.;To this end, a connection pipe 3 provided on an exhaust gas discharge pipe 2 through which exhaust gas generated in accordance with the operation of the boiler 1 is discharged, an opening / closing means 4 provided on the connection pipe for controlling the flow path on the connection pipe An external air inlet pipe 6 installed at the other side of the connection pipe for introducing external air in accordance with the driving of the blower 5, A temperature sensor 10 installed on the supply pipe for measuring the temperature of the air supplied to the inside of the aerobic fermentation tank 10, And a control unit (11) for operating the opening / closing means in accordance with the temperature of the air sensed by the control unit (11).
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