Grease traps or grease interceptors collect grease and floating material from households, garages, restaurants, small hotels, hospitals and the like. Frequent cleaning is essential if operation is to be efficient. Owing to the danger of explosion or fire, motor oil, gasoline and similar light mineral oils should not be allowed to enter sewer systems.
Where the wastewater contains large amounts of greasy kitchen waste, grease traps should be used. Their minimum capacity is 3.0 gal (11.5 l) per capita and should be no less than 30 gal (0.115 m3) per unit (see Figure 7.16.1). The influent line should terminate at least 6in (15 cm) below the water line, and the effluent pipe should take off near the bottom of the tank.
Commercial grease interceptors are also available for restaurants and smaller industrial establishments, which are connected to public sewer systems.
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