Rubbish Categorizer

Harmony

Is a system which is able to separate collected rubbish according to their mass, practical in modern days? (Or, is such system already exist?)

I am thinking of applying this system in vacum cleaner.

Danger

I don't know if such a thing can be applied on a vacuum cleaner scale. The best system that I know of is that employed by recycling centres. They use magnetic separation, fractional distillation, density separation, and some other stuff.
Theoretically, you should be able to have drop chutes along the vacuum path that would collect according to density, but I'm not sure if it can be pulled off on a small scale.