Mass Transfer
An example of elutioh is

Dissolution of tannin out of tree barks by water
Separation of uranium oxide from its ore by H₂SO₄ in a Pachuca tank
Recovery of vegetable oils from seeds
Separation of sugar from sugar beet by hot water

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Mass Transfer
Blowdown in a cooling tower

Increases the scale forming tendencies of water
All of these
Means discarding a small fraction of circulating water to prevent and limit the concentration of salt and impurities
Is undesirable

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