On the day designated in the notice of sale the county treasurer shall sell the real estate on which the taxes and legal charges have not been paid, and it shall be the duty of the county treasurer of such county, to bid off in the name of the county all real estate advertised for sale for delinquent taxes for the amount of the delinquent taxes and the legal charges due thereon, including the costs of advertising and the fees for selling, and no bid shall be received by said county treasurer from any other person for the real estate so sold.