It shall be unlawful for any person to burn, dump, collect, remove or in any other manner accumulate or dispose of garbage upon any street, alley, public place or private property within the city, otherwise than as provided in this chapter. Any unauthorized accumulation of garbage on any premises is declared to be a nuisance and is prohibited. Failure to remove any existing accumulation of garbage within 30 days after the effective date of the ordinance codified in this chapter shall be deemed a violation of this chapter.