Special assessments and all interest and charges thereon, from the date of confirmation of the roll, shall be and remain a lien upon the property assessed of the same character and effect as the lien created by general law for state and county taxes, and by this charter for city taxes, until paid. From such date and after confirmation as shall be fixed by the council, the same collection fees shall be collected on delinquent special assessments and upon delinquent installments of such special assessments beginning on the following September first of each year, as are provided by this charter to be collected on delinquent city taxes. Such delinquent special assessments shall be subject to the same penalties, and the lands upon which the same are a lien shall be subject to sale therefor, the same as are delinquent city taxes and the lands upon which they constitute a lien.