The ordinance making the assessment against the property, as provided for in Section 19-10, shall fix a lien against the property of each of such owners, declaring the owner thereof to be personally liable for the respective amounts which may be assessed against them and set the time in which the assessment shall be paid which time shall not be longer than 30 days from the date of the making of the assessment. Such assessment shall bear interest at the rate of 10 percent per annum from the date of making the same. Any number of assessments against different pieces of property may be levied in one and the same ordinance. (Code 1941, Art. 86-53)