(A) If oils and grease are biodegradable and in a physical state that does not cause clogging or undue maintenance problems in the wastewater facilities, the discharge of these substances can be accepted in a wastewater treatment system. Animal and vegetable oils and grease (polar substances) are readily degradable in aerobic and anaerobic biological treatment systems provided that the physical states of the oils and grease do not prevent the necessary contact with the biological suspensions responsible for treatment. However, oils and grease of mineral origin (primarily nonpolar substances) are essentially non-biodegradable either in aerobic or anaerobic processes and should be removed from industrial wastes to the maximum degree practical before discharge. The discharge of these oils and grease of mineral origin shall be limited to the regulation of the city. Grease separators are required for all meat packing plants and on building sewers serving hotels, restaurants, and institutions in which large numbers of meals are served.
(B) The use of garbage grinders precludes the use of gravity grease separators. Flammable waste and grit intercepting facilities must be provided on all building sewers from garages, filling stations, cleaning establishments and other concerns using volatile oils or solvents. Special pretreatment methods are required for the removal of soluble cutting oils. All grease and oil removal facilities must be approved by the city.
(1981 Code, § 51.088) (Ord. 6405-90, passed 9-10-1990) Penalty, see § 51.999