At first, the oil-water separator in Yuyuan Garden can be used in the kitchen of a private family. In the kitchen, there will inevitably be a lot of oil stains in the pots, pans and chopsticks after cooking, and whether we use detergent or other deoiling products to remove these oil stains, they will flow into the underground drainage pipe with the water. At this time, an oil-water separator is needed to help treat these sewage. Followed by hotels and restaurants in the drainage system. Hotels and restaurants provide brunch and lunch for guests, which is heavy in quantity and oil. It is necessary to clean the drainage system with an oil-water separator so that the wastewater that meets the standards can be discharged into the sewage treatment plant set up by the government. The third is the drainage system of catering service industry, exhibition restaurant, student canteen, staff canteen and other canteens. The fourth is food processing plants, especially some oily food plants, such as ham sausage processing plants and bacon processing plants.