The majority of restaurants and large-scale food production establishments are facing challenges in managing their waste disposal system. The discharge of grease into sewers is causing a blockage in pipes and problems at sewage treatment works and septic tanks. Grease is a normal constituent of liquid wastes from kitchens and food preparation rooms where grease is generated from the washing of used crockery and utensils. Facilities must be available at restaurant kitchens for the bulk collection and removal of grease, fats, and oil and to prohibit their discharge into the drainage system. The separation and removal of grease substances are possible due to the difference in density between the substance to be separated and the carrying liquid and by the reduction of flow velocity.Restaurants, hotels, cafeterias, schools, hospitals, and institutional or commercial buildings where food is served in great quantity may produce grease in sufficient amounts to warrant the installation of grease traps. Dairies, slaughterhouses, and commercial food-processing plants have grease and fats as byproducts and require grease traps. Gasoline service stations, automobile repair shops, laundries, dry-cleaning plants, machine shops, and industries using chemical processing are sources of flammable and volatile wastes that must be removed and treated; machine shops, garages, service stations, hospitals, medical clinics, dental laboratories, and fish preparation areas also need grease traps.