Check out some Italian research going into a garbage robot. This thing is actually out on the streets:
‘Trash robots are being seriously considered as a viable alternative to huge, inefficient garbage trucks that often can’t fit down narrow Italian streets’ (Gajitz).
Unrelated to this project I also saw a concept for garbage powered streetlights:
‘Doubling as a trash bin, the lamppost then uses the methane, a byproduct of trash, as a fuel to power the lamps’ (I New Idea).