Garbage and other combustible wastes may be disposed of within the building wherein it is accumulated or within a closed building accessory thereto situated on the same premises by complete incineration of such garbage or waste in such a manner as to create no noxious odors, smoke or other nuisance, or by grinding or by shredding such waste finely and disposing of it through pipes leading to a public sanitary sewer; provided, however, that all garbage or combustible matter so disposed of in such pipes shall have been ground or shredded to such a degree that all particles are carried freely under the flow conditions normally prevailing in the sewers into which the same is deposited. No garbage or other combustible wastes shall be disposed of in violation of the provisions of this code relating to fire prevention and sewage disposal. (1978 Code § 9-2-1-5)