(a) To acquire, construct, improve, enlarge, and repair all or part of a solid waste disposal system, a county may issue bonds payable:
(1) from and secured by a pledge of all or part of the revenues to accrue under a contract entered into under this chapter; and
(2) from other income pledged by the county.
(b) Pending issuance of definitive bonds, a county may issue negotiable interim bonds or obligations eligible for exchange or substitution by use of the definitive bonds.