Best way to separate Different liquids with different density/mass

Hello, i'm no chemist, and I'm working on a project where I need to
efficiently separate different liquids.

I would also like suggestion on types of liquids that could replace
the ones stated that could make the process more efficient.

Basically, I will have Ethanol and Vegetable Oil and an other liquid
which will vary in density( polluted water ), but should always be
more dense than both Ethanol and Vegetable oil.

They will all be 'thrown' together in a receptacle, and from then on I
need to separate them to remove the polluted water. The trick is, I
need to automate it, and it need to be fast and if possible use little
or no electricity. But, all options are considered.

I can use something else than Ethanol and Oil, but it need to be
Odorless, and as non-toxic as possible. Using liquids that will not
mix with water and then separate after it settles for a few minutes
would be perfect, but if not, I was wondering what exist to do such
thing( Osmosis, centrifugal separation? I don't know.... very limited
knowledge in that field )

So please help me with anything that you might think about!

Thanks a lot!

Hugo

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