The governing body of a county, by separate ordinance finally enacted by an affirmative vote of two-thirds of the members to which such governing body is entitled, may authorize the issuance of refunding special purpose revenue bonds of the county for the purpose of refunding any special purpose revenue bonds then outstanding and issued by that county under this chapter, whether or not such outstanding special purpose revenue bonds have matured or are then subject to redemption. Each county is authorized to provide, by separate ordinance finally enacted by an affirmative vote of two-thirds of the members to which such governing body is entitled, for the issuance of a single issue of special purpose revenue bonds of the county for the combined purposes of (1) financing the cost of a pollution control project or improvement or expansion thereof, and (2) refunding special purpose revenue bonds of the county which theretofore shall have been issued under this chapter and then shall be outstanding, whether or not such outstanding special purpose revenue bonds have matured or then are subject to redemption.

Nothing in this section shall require or be deemed to require a county to elect to redeem or prepay special purpose revenue bonds being refunded which were issued in the form customarily known as term bonds in accordance with any sinking fund installment schedule specified in any ordinance authorizing the issuance thereof, or, if a county elects to redeem or prepay any such bonds, to redeem or prepay as of any particular date or dates. The issuance of such special purpose revenue bonds, the maturities, and other details thereof, the rights and remedies of the holders thereof, and the rights, powers, privileges, duties, and obligations of the county with respect to the bonds, shall be governed by the foregoing provisions of this chapter insofar as the provisions may be applicable.