The Council may construct, reconstruct, enlarge, alter, modify, equip, operate and maintain a sewage disposal or sewage purification system within or without the corporate limits or both, including but not limited to: all methods of storm drainage, intercepting sewers, diversion sewers, relieving or interconnection sewers, sewers to separate storm and sanitary sewage, pump or ejector stations and equipment, and plants for the treatment and disposal of sewage. For that purpose the City may acquire by any lawful means property, real or personal, interests in property, equipment, and related facilities and may make all expenditures which the Council finds necessary or appropriate to carry out such purposes, either within or without the corporate limits. The City may sell or otherwise dispose of any or all by-products or salvage products from this operation. The City also may contract with any other person, public or private, to further purification of public waters or protection of the public health. [Nov. 8, 1938, new sec. 347; 1942 recod., sec. 9-604; rev. Nov. 8, 1966.]