After extending the city taxes aforesaid and not later than June 15th in each year, the Assessor shall certify said tax roll, and the Mayor shall annex his/her warrant thereto, directing and requiring the Treasurer to collect from the several persons named in said roll the several sums mentioned therein opposite their respective names as a tax or assessment and granting to him/her, for the purpose of collecting the taxes, assessments, and charges on such roll, all the powers and immunities possessed by township treasurers for the collection of taxes under the general laws of the State.