(a) The governing body of a county, by an ordinance finally enacted by an affirmative vote of two-thirds of the members to which such governing body is entitled, and by a separate ordinance for each single pollution control project or a single program of pollution control projects may authorize the issuance of special purpose revenue bonds for the purposes of this chapter; provided the governing body of such county finds that the issuance of such bonds is in the public interest. Special purpose revenue bonds issued pursuant to this chapter may be in one or more series for each single pollution control project or single program of pollution control projects. The special purpose revenue bonds of each issue shall be dated, shall bear interest at such rate or rates, shall mature at such time or times not exceeding thirty years from their date or dates, shall have such rank or priority, and may be made redeemable before maturity at the option of the county, the holder, or both, at such price or prices and under such terms and conditions, all as may be determined by the county. The county shall determine the form of the special purpose revenue bonds, including any interest coupons to be attached thereto, and the manner of execution of the special purpose revenue bonds, and shall fix the denomination or denominations of the special purpose revenue bonds and the place or places of payment of principal and interest, which may be at any bank or trust company within or without the State of Hawaii. The special purpose revenue bonds may be issued in coupon or in registered form, or both, as the county may determine, and provisions may be made for the registration of any coupon bonds as to principal alone and also as to both principal and interest, and for the reconversion into coupon bonds of any bonds registered as to both principal and interest. The county may sell special purpose revenue bonds in such manner, either at public or at private sale, and for such price as it may determine to be for the best interest of the county.