Upon the confirmation of each special assessment roll, the special assessments thereon shall become a debt to the city from the persons to whom they are assessed and, until paid, be and continue to be a lien upon the property assessed for the amount of such assessments and all interest and collection charges which may accrue thereon. Such lien shall be of the same character and effect as that which is created by this charter for city taxes. For this purpose, the word “assessments” used in Chapter 8 shall include special assessments authorized by this chapter.