Problem to be solved: to provide an odor suppressing system of a grease trap capable of suppressing the odor to be generated, a method of producing a photocatalyst, a photocatalyst, a method for suppressing odor of a grease trap, and an odor suppressing system of a drain facility.Grease trap odor control system 10A first tank 21 provided with a basket 212 to receive an inflow drainageDisposed downstream of first tankThe second tank 22 for separating the fat G isA third tank 23 provided downstream of the second tank 22Equipped withBasket 212The odor trap system 10 of the grease trap 20 in which the titanium oxide is coated inside the first tank 21 and inside the third tankPut into the third tankA hollow first photocatalyst 12b of stainless steel coated with titanium oxideA first light source 14b irradiating the UV-C class light toward the third vessel 23 and.Diagram
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