Oil-water separators can be divided into catering, marine, air filtration and automobile. You asked whether the grease trap and the oil-water separator are the same equipment, which is hard to say. As said upstairs, the earliest grease trap was made of concrete, and the catering oil-water separator was improved on the basis of the grease trap, including the finished box of heating, aeration and air flotation.

I hope I can help you!