Cost of refuse; Which municipal system can best handle a small amount of mixed small-sized refuse ?

e.g empty a small dust-buster Into the trash (->landfill, etc.) or into the toilet?
If a sewerage system has accommodation for things like getting bits of plastic out separately from hair and paper, then some material might be recycled. But if it has no such reclamation facility then it probably ends up in the landfill anyway – that’s if it’s trapped by the system, or else it flows out to maybe a river if it isn’t trapped. Water is used for transportation in a sewerage system, but is that more or less expensive than truck collection ?
Disposal to the trash involves plastic trash bags, collection and transportation to the dump and impact of a dump on the environment.

What do you think?