Whenever revenue bonds are issued under this Division, the revenues derived from the operation of the project shall be set aside as collected and be deposited in a separate fund, separate and apart from all other funds of such county, and be used in paying the cost of maintenance and operation, paying the principal of and interest upon the bonds of such county, issued under this Division, and for the transfer of any surplus amounts annually to the general corporate fund of any such county only when and in the manner permitted and authorized in accordance with the covenants and provisions and terms of the ordinance authorizing the issuance of any such bonds under the provisions of this Division.