Such special taxes when collected must be paid over by him to the county treasurer or, if there is no county treasurer to the custodian of the funds of the county, and the county treasurer or, if there is no county treasurer, the custodian of the funds of the county receiving such special taxes shall keep the same separate and distinct from all other public funds and shall keep a separate account thereof and shall promptly disburse the same upon orders drawn thereon by the legally authorized authority.