Revenues received by the county from any property, building, or facility owned by the county or any agency or authority established by the county in the redevelopment project area may be used to pay redevelopment project costs or reduce outstanding obligations of the county incurred under this chapter for redevelopment project costs. If the obligations are used to finance the extension or expansion of a system as defined in § 6-21-40 in the redevelopment project area, all or a portion of the revenues of the system, whether or not located entirely within the redevelopment project area, including the revenues of the redevelopment project, may be pledged to secure the obligations issued under this chapter. The county is fully empowered to use any of the powers granted by either or both of the provisions of Chapter 17 of Title 6 (The Revenue Bond Refinancing Act of 1937) or the provisions of Chapter 21 of Title 6 (Revenue Bond Act for Utilities). In exercising the powers conferred by the provisions, the county may make any pledges and covenants authorized by any provision of those chapters. The county may place the revenues in the special tax allocation fund or a separate fund which must be held by the county or financial institution designated by the county. Revenue received by the county from the sale or other disposition of real property acquired by the county with the proceeds of obligations issued under the provisions of this chapter must be deposited by the county in the special tax allocation fund or a separate fund which must be held by the county or financial institution designated by the county. Proceeds of grants may be pledged by the county and deposited in the special tax allocation fund or a separate fund.