[Challenge] oil and fat content and volume residue on it was prevented from exiting the interceptor device in oil-containing fat sewage treatment system, and to eliminate the need for removal work of regular fats and oils. A aerating pipe 7 that is placed on the interceptor device 1 is connected to the ozone generator 10, air containing the ozone is aerated. And produce a hydrophilic group such as -COOH by low molecular weight oils and fats by ozone, and since H of the carboxyl groups of the fats and oils are soaps of which are replaced with Na, fat can be efficiently decomposed treated discharged periodically It will eliminate the need for removal work of such fats and oils. And a timer 15, by performing an aeration in the time zone in which the waste water or the like does not flow into the interceptor device 1, grease and volume residues can be prevented from flowing out. .BACKGROUND
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